// QR Rapido Speed Generator
class QRRapidoGenerator { 
    constructor() {
        this.startTime = 0;
        this.currentQR = null;
        this.timerInterval = null;
        this.languageStrings = {
            'pt-BR': {
                tagline: 'Gere QR codes em segundos!',
                generating: 'Gerando...',
                generated: 'Gerado em',
                seconds: 's',
                ultraFast: 'Geração ultra rápida!',
                fast: 'Geração rápida!',
                normal: 'Geração normal',
                error: 'Erro na geração. Tente novamente.',
                success: 'QR Code salvo no histórico!'
            },
            'es': {
                tagline: '¡Genera códigos QR en segundos!',
                generating: 'Generando...',
                generated: 'Generado en',
                seconds: 's',
                ultraFast: '¡Generación ultra rápida!',
                fast: '¡Generación rápida!',
                normal: 'Generación normal',
                error: 'Error en la generación. Inténtalo de nuevo.',
                success: '¡Código QR guardado en el historial!'
            },
            'en': {
                tagline: 'Generate QR codes in seconds!',
                generating: 'Generating...',
                generated: 'Generated in',
                seconds: 's',
                ultraFast: 'Ultra fast generation!',
                fast: 'Fast generation!',
                normal: 'Normal generation',
                error: 'Generation error. Please try again.',
                success: 'QR Code saved to history!'
            }
        };
        this.currentLang = localStorage.getItem('qrrapido-lang') || 'pt-BR';
        
        this.selectedType = null;
        this.selectedStyle = 'classic'; // Estilo padrão
        this.contentValid = false;
        
        this.initializeEvents();
        this.checkAdFreeStatus();
        this.updateLanguage();
        this.updateStatsCounters();
        this.initializeUserCounter();
        this.initializeProgressiveFlow();
        this.initializeRateLimiting();
        
        // Validar segurança dos dados após carregamento
        setTimeout(() => {
            this.validateDataSecurity();
            this.testUTF8Encoding();
        }, 1000);
    }

    initializeEvents() {
        // Form submission with timer
        const form = document.getElementById('qr-speed-form');
        if (form) {
            form.addEventListener('submit', this.generateQRWithTimer.bind(this));
        }
        
        // Quick style selection
        document.querySelectorAll('input[name="quick-style"]').forEach(radio => {
            radio.addEventListener('change', this.applyQuickStyle.bind(this));
        });

        // Logo upload feedback
        const logoUpload = document.getElementById('logo-upload');
        if (logoUpload) {
            logoUpload.addEventListener('change', this.handleLogoSelection.bind(this));
        }

        // Corner style validation for non-premium users
        const cornerStyle = document.getElementById('corner-style');
        if (cornerStyle) {
            cornerStyle.addEventListener('change', this.handleCornerStyleChange.bind(this));
        }
        
        // QR type change with hints and flow
        const qrType = document.getElementById('qr-type');
        if (qrType) {
            qrType.addEventListener('change', (e) => {
                this.handleTypeSelection(e.target.value);
                this.updateContentHints();
            });
        }
        
        // Content validation
        const qrContent = document.getElementById('qr-content');
        if (qrContent) {
            qrContent.addEventListener('input', (e) => {
                this.handleContentChange(e.target.value);
            });
        }
        
        // Style selection
        document.querySelectorAll('input[name="quick-style"]').forEach(radio => {
            radio.addEventListener('change', (e) => {
                this.handleStyleSelection(e.target.value);
            });
        });
        
        // Add listeners to all relevant fields to update button state
        const fieldsToWatch = [
            'qr-content', 'vcard-name', 'vcard-mobile', 'vcard-email',
            'wifi-ssid', 'wifi-password', 'sms-number', 'sms-message',
            'email-to', 'email-subject', 'email-body'
        ];
        fieldsToWatch.forEach(id => {
            const el = document.getElementById(id);
            if (el) {
                el.addEventListener('input', () => this.updateGenerateButton());
            }
        });
        document.querySelectorAll('input[name="wifi-security"]').forEach(radio => {
            radio.addEventListener('change', () => this.updateGenerateButton());
        });
        
        // Language selector
        document.querySelectorAll('[data-lang]').forEach(link => {
            link.addEventListener('click', this.changeLanguage.bind(this));
        });
        
        // Real-time preview for premium users
        if (this.isPremiumUser()) {
            this.setupRealTimePreview();
        }
        
        // Download buttons
        this.setupDownloadButtons();
        
        // Share functionality
        this.setupShareButtons();
        
        // Save to history
        const saveBtn = document.getElementById('save-to-history');
        if (saveBtn) {
            saveBtn.addEventListener('click', this.saveToHistory.bind(this));
        }
    }

    setupDownloadButtons() {
        const pngBtn = document.getElementById('download-png');
        const svgBtn = document.getElementById('download-svg');
        const pdfBtn = document.getElementById('download-pdf');
        
        if (pngBtn) pngBtn.addEventListener('click', () => this.downloadQR('png'));
        if (svgBtn) svgBtn.addEventListener('click', () => this.downloadQR('svg'));
        if (pdfBtn) pdfBtn.addEventListener('click', () => this.downloadQR('pdf'));
    }

    setupShareButtons() {
        // Check if Web Share API is supported and show/hide native share option
        if (navigator.share && this.isMobileDevice()) {
            const nativeShareOption = document.getElementById('native-share-option');
            if (nativeShareOption) {
                nativeShareOption.classList.remove('d-none');
            }
        }

        // Show save to gallery option on mobile
        if (this.isMobileDevice()) {
            const saveGalleryOption = document.getElementById('save-gallery-option');
            if (saveGalleryOption) {
                saveGalleryOption.classList.remove('d-none');
            }
        }

        // Add event listeners to share buttons
        const shareButtons = {
            'native-share': () => this.shareNative(),
            'share-whatsapp': () => this.shareWhatsApp(),
            'share-telegram': () => this.shareTelegram(),
            'share-email': () => this.shareEmail(),
            'copy-qr-link': () => this.copyToClipboard(),
            'save-to-gallery': () => this.saveToGallery()
        };

        Object.entries(shareButtons).forEach(([id, handler]) => {
            const button = document.getElementById(id);
            if (button) {
                button.addEventListener('click', (e) => {
                    e.preventDefault();
                    handler();
                });
            }
        });
    }

    isMobileDevice() {
        return /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent) ||
               (navigator.maxTouchPoints && navigator.maxTouchPoints > 2 && /MacIntel/.test(navigator.platform));
    }

    async shareNative() {
        if (!this.currentQR || !navigator.share) return;

        try {
            // Create a blob from the base64 image
            const base64Response = await fetch(`data:image/png;base64,${this.currentQR.base64}`);
            const blob = await base64Response.blob();
            const file = new File([blob], 'qrcode.png', { type: 'image/png' });

            const shareData = {
                title: 'QR Code - QR Rapido',
                text: 'QR Code gerado com QR Rapido - o gerador mais rápido do Brasil!',
                url: window.location.origin,
                files: [file]
            };

            // Check if files can be shared
            if (navigator.canShare && navigator.canShare(shareData)) {
                await navigator.share(shareData);
            } else {
                // Fallback without files
                await navigator.share({
                    title: shareData.title,
                    text: shareData.text,
                    url: shareData.url
                });
            }

            this.trackShareEvent('native');
        } catch (error) {
            console.error('Error sharing:', error);
            if (error.name !== 'AbortError') {
                this.showError('Erro ao compartilhar. Tente outro método.');
            }
        }
    }

    shareWhatsApp() {
        if (!this.currentQR) return;

        const text = encodeURIComponent('QR Code gerado com QR Rapido - o gerador mais rápido do Brasil! ' + window.location.origin);
        const url = `https://wa.me/?text=${text}`;
        
        if (this.isMobileDevice()) {
            window.open(url, '_blank');
        } else {
            window.open(`https://web.whatsapp.com/send?text=${text}`, '_blank');
        }

        this.trackShareEvent('whatsapp');
    }

    shareTelegram() {
        if (!this.currentQR) return;

        const text = encodeURIComponent('QR Code gerado com QR Rapido - o gerador mais rápido do Brasil!');
        const url = encodeURIComponent(window.location.origin);
        const telegramUrl = `https://t.me/share/url?url=${url}&text=${text}`;
        
        window.open(telegramUrl, '_blank');
        this.trackShareEvent('telegram');
    }

    shareEmail() {
        if (!this.currentQR) return;

        const subject = encodeURIComponent('QR Code - QR Rapido');
        const body = encodeURIComponent(`Olá!\n\nCompartilho com você este QR Code gerado no QR Rapido, o gerador mais rápido do Brasil!\n\nAcesse: ${window.location.origin}\n\nAbraços!`);
        const mailtoUrl = `mailto:?subject=${subject}&body=${body}`;
        
        window.location.href = mailtoUrl;
        this.trackShareEvent('email');
    }

    async copyToClipboard() {
        if (!this.currentQR) return;

        try {
            const shareText = `QR Code gerado com QR Rapido - ${window.location.origin}`;
            
            if (navigator.clipboard && window.isSecureContext) {
                await navigator.clipboard.writeText(shareText);
            } else {
                // Fallback for older browsers
                const textArea = document.createElement('textarea');
                textArea.value = shareText;
                textArea.style.position = 'fixed';
                textArea.style.left = '-999999px';
                textArea.style.top = '-999999px';
                document.body.appendChild(textArea);
                textArea.focus();
                textArea.select();
                document.execCommand('copy');
                textArea.remove();
            }

            this.showSuccess('Link copiado para a área de transferência!');
            this.trackShareEvent('copy');
        } catch (error) {
            console.error('Error copying to clipboard:', error);
            this.showError('Erro ao copiar link. Tente novamente.');
        }
    }

    async saveToGallery() {
        if (!this.currentQR) return;

        try {
            // Create a blob from the base64 image
            const base64Response = await fetch(`data:image/png;base64,${this.currentQR.base64}`);
            const blob = await base64Response.blob();
            
            // Create download link
            const url = window.URL.createObjectURL(blob);
            const a = document.createElement('a');
            a.href = url;
            a.download = `qrrapido-${new Date().toISOString().slice(0,10)}-${Date.now()}.png`;
            document.body.appendChild(a);
            a.click();
            document.body.removeChild(a);
            window.URL.revokeObjectURL(url);

            this.showSuccess('QR Code baixado! Verifique sua galeria/downloads.');
            this.trackShareEvent('gallery');
        } catch (error) {
            console.error('Error saving to gallery:', error);
            this.showError('Erro ao salvar na galeria. Tente novamente.');
        }
    }

    trackShareEvent(method) {
        // Google Analytics
        if (typeof gtag !== 'undefined') {
            gtag('event', 'qr_shared', {
                'share_method': method,
                'user_type': this.isPremiumUser() ? 'premium' : 'free',
                'language': this.currentLang
            });
        }

        // Internal tracking
        console.log(`QR Code shared via ${method}`);
    }

    async generateQRWithTimer(e) {
        e.preventDefault();
        
        // Check rate limit for anonymous users
        if (!this.checkRateLimit()) return;
        
        // Validation
        if (!this.validateForm()) return;
        
        // Start timer
        this.startTime = performance.now();
        this.showGenerationStarted();
        
        const requestData = this.collectFormData();
        
        try {
            // Build fetch options based on request type
            const fetchOptions = {
                method: 'POST',
                body: requestData.isMultipart ? requestData.data : JSON.stringify(requestData.data)
            };
            
            // Add Content-Type header only for JSON requests (FormData sets its own)
            if (!requestData.isMultipart) {
                fetchOptions.headers = {
                    'Content-Type': 'application/json'
                };
            }
            
            const response = await fetch(requestData.endpoint, fetchOptions);
            
            if (!response.ok) {
                const errorData = await response.json().catch(() => ({}));
                
                if (response.status === 429) {
                    this.showUpgradeModal('Limite de QR codes atingido! Upgrade para QR Rapido Premium e gere códigos ilimitados.');
                    return;
                }
                
                if (response.status === 400 && errorData.requiresPremium) {
                    this.showUpgradeModal(errorData.error || 'Logo personalizado é exclusivo do plano Premium.');
                    return;
                }
                
                throw new Error(errorData.error || 'Erro na geração');
            }
            
            const result = await response.json();
            
            if (!result.success) {
                if (result.requiresPremium) {
                    this.showUpgradeModal(result.error || 'Logo personalizado é exclusivo do plano Premium.');
                    return;
                }
                throw new Error(result.error || 'Erro desconhecido');
            }
            
            const generationTime = ((performance.now() - this.startTime) / 1000).toFixed(1);
            
            this.displayQRResult(result, generationTime);
            this.updateSpeedStats(generationTime);
            this.trackGenerationEvent(requestData.data.type || requestData.data.get('type'), generationTime);
            
        } catch (error) {
            console.error('Erro ao gerar QR:', error);
            this.showError(this.languageStrings[this.currentLang].error);
        } finally {
            this.hideGenerationLoading();
        }
    }

    validateForm() {
        const qrType = document.getElementById('qr-type').value;
        
        if (!qrType) {
            this.showError('Selecione o tipo de QR code');
            return false;
        }
        
        // Special validation for VCard
        if (qrType === 'vcard') {
            try {
                if (window.vcardGenerator) {
                    const errors = window.vcardGenerator.validateVCardData();
                    if (errors.length > 0) {
                        this.showError(errors.join('<br>'));
                        return false;
                    }
                    return true;
                } else {
                    this.showError('VCard generator não está disponível');
                    return false;
                }
            } catch (error) {
                this.showError('Erro na validação do VCard: ' + error.message);
                return false;
            }
        } else if (qrType === 'wifi') {
            const errors = window.wifiGenerator.validateWiFiData();
            if (errors.length > 0) {
                this.showError(errors.join('<br>'));
                return false;
            }
            return true;
        } else if (qrType === 'sms') {
            const errors = window.smsGenerator.validateSMSData();
            if (errors.length > 0) {
                this.showError(errors.join('<br>'));
                return false;
            }
            return true;
        } else if (qrType === 'email') {
            const errors = window.emailGenerator.validateEmailData();
            if (errors.length > 0) {
                this.showError(errors.join('<br>'));
                return false;
            }
            return true;
        }
        
        // Normal validation for other types
        const qrContent = document.getElementById('qr-content').value.trim();
        
        if (!qrContent) {
            this.showError('Digite o conteúdo do QR code');
            return false;
        }
        
        if (qrContent.length > 4000) {
            this.showError('Conteúdo muito longo. Máximo 4000 caracteres.');
            return false;
        }
        
        return true;
    }

    collectFormData() {
        const type = document.getElementById('qr-type').value;
        const quickStyle = document.querySelector('input[name="quick-style"]:checked')?.value || 'classic';
        const styleSettings = this.getStyleSettings(quickStyle);

        if (type === 'url') {
            const dynamicData = window.dynamicQRManager.getDynamicQRData();
            if (dynamicData.requiresPremium) {
                throw new Error('QR Dinâmico é exclusivo para usuários Premium. Faça upgrade para usar analytics.');
            }
            return {
                data: {
                    type: 'url',
                    content: dynamicData.originalUrl,
                    isDynamic: dynamicData.isDynamic,
                    quickStyle: quickStyle,
                    primaryColor: document.getElementById('primary-color').value || (styleSettings.primaryColor || '#000000'),
                    backgroundColor: document.getElementById('bg-color').value || (styleSettings.backgroundColor || '#FFFFFF'),
                    size: parseInt(document.getElementById('qr-size').value),
                    margin: parseInt(document.getElementById('qr-margin').value),
                    cornerStyle: document.getElementById('corner-style')?.value || 'square',
                    optimizeForSpeed: true,
                    language: this.currentLang
                },
                isMultipart: false,
                endpoint: '/api/QR/GenerateRapid'
            };
        }
        
        if (type === 'wifi') {
            const wifiContent = window.wifiGenerator.generateWiFiString();
            return {
                data: {
                    type: 'text', // WiFi is treated as text in the backend
                    content: wifiContent,
                    quickStyle: quickStyle,
                    primaryColor: document.getElementById('primary-color').value || (styleSettings.primaryColor || '#000000'),
                    backgroundColor: document.getElementById('bg-color').value || (styleSettings.backgroundColor || '#FFFFFF'),
                    size: parseInt(document.getElementById('qr-size').value),
                    margin: parseInt(document.getElementById('qr-margin').value),
                    cornerStyle: document.getElementById('corner-style')?.value || 'square',
                    optimizeForSpeed: true,
                    language: this.currentLang
                },
                isMultipart: false,
                endpoint: '/api/QR/GenerateRapid'
            };
        } else if (type === 'sms') {
            const smsContent = window.smsGenerator.generateSMSString();
            return {
                data: {
                    type: 'text',
                    content: smsContent,
                    quickStyle: quickStyle,
                    primaryColor: document.getElementById('primary-color').value || (styleSettings.primaryColor || '#000000'),
                    backgroundColor: document.getElementById('bg-color').value || (styleSettings.backgroundColor || '#FFFFFF'),
                    size: parseInt(document.getElementById('qr-size').value),
                    margin: parseInt(document.getElementById('qr-margin').value),
                    cornerStyle: document.getElementById('corner-style')?.value || 'square',
                    optimizeForSpeed: true,
                    language: this.currentLang
                },
                isMultipart: false,
                endpoint: '/api/QR/GenerateRapid'
            };
        } else if (type === 'email') {
            const emailContent = window.emailGenerator.generateEmailString();
            return {
                data: {
                    type: 'text',
                    content: emailContent,
                    quickStyle: quickStyle,
                    primaryColor: document.getElementById('primary-color').value || (styleSettings.primaryColor || '#000000'),
                    backgroundColor: document.getElementById('bg-color').value || (styleSettings.backgroundColor || '#FFFFFF'),
                    size: parseInt(document.getElementById('qr-size').value),
                    margin: parseInt(document.getElementById('qr-margin').value),
                    cornerStyle: document.getElementById('corner-style')?.value || 'square',
                    optimizeForSpeed: true,
                    language: this.currentLang
                },
                isMultipart: false,
                endpoint: '/api/QR/GenerateRapid'
            };
        }

        // Handle VCard type
        if (type === 'vcard') {
            if (window.vcardGenerator) {
                const vcardContent = window.vcardGenerator.getVCardContent();
                const encodedContent = this.prepareContentForQR(vcardContent, 'vcard');
                return {
                    data: {
                        type: 'vcard', // Keep as vcard type for tracking
                        content: encodedContent,
                        quickStyle: quickStyle,
                        primaryColor: document.getElementById('primary-color').value || (styleSettings.primaryColor || '#000000'),
                        backgroundColor: document.getElementById('bg-color').value || (styleSettings.backgroundColor || '#FFFFFF'),
                        size: parseInt(document.getElementById('qr-size').value),
                        margin: parseInt(document.getElementById('qr-margin').value),
                        cornerStyle: document.getElementById('corner-style')?.value || 'square',
                        optimizeForSpeed: true,
                        language: this.currentLang
                    },
                    isMultipart: false,
                    endpoint: '/api/QR/GenerateRapid'
                };
            } else {
                throw new Error('VCard generator não está disponível');
            }
        }
        
        // Check if logo is selected for premium users
        const logoUpload = document.getElementById('logo-upload');
        const hasLogo = logoUpload && logoUpload.files && logoUpload.files[0];
        
        if (hasLogo) {
            // Use FormData for premium users with logo
            const formData = new FormData();
            
            // Get user-selected colors with proper priority
            const userPrimaryColor = document.getElementById('primary-color').value;
            const userBackgroundColor = document.getElementById('bg-color').value;
            
            // Priority: User selection > Style defaults > Fallback
            // Always use user selection if it exists, regardless of what color it is
            const finalPrimaryColor = userPrimaryColor || (styleSettings.primaryColor || '#000000');
            const finalBackgroundColor = userBackgroundColor || (styleSettings.backgroundColor || '#FFFFFF');
            
            // Debug logging for color selection
            console.log('🎨 Color Selection Debug (FormData):');
            console.log('  Style:', quickStyle);
            console.log('  Style Default Primary:', styleSettings.primaryColor);
            console.log('  User Selected Primary:', userPrimaryColor);
            console.log('  Final Primary Color:', finalPrimaryColor);
            console.log('  Final Background Color:', finalBackgroundColor);
            
            // Add basic form fields with UTF-8 encoding
            const rawContent = document.getElementById('qr-content').value;
            const encodedContent = this.prepareContentForQR(rawContent, type);
            
            formData.append('type', document.getElementById('qr-type').value);
            formData.append('content', encodedContent);
            formData.append('quickStyle', quickStyle);
            formData.append('primaryColor', finalPrimaryColor);
            formData.append('backgroundColor', finalBackgroundColor);
            formData.append('size', parseInt(document.getElementById('qr-size').value));
            formData.append('margin', parseInt(document.getElementById('qr-margin').value));
            formData.append('cornerStyle', document.getElementById('corner-style')?.value || 'square');
            formData.append('optimizeForSpeed', 'true');
            formData.append('language', this.currentLang);
            
            // Add logo file
            formData.append('logo', logoUpload.files[0]);
            console.log('Logo file added to form data:', logoUpload.files[0].name, logoUpload.files[0].size + ' bytes');
            
            return { data: formData, isMultipart: true, endpoint: '/api/QR/GenerateRapidWithLogo' };
        } else {
            // Use JSON for basic QR generation (original working method)
            // Get user-selected colors
            const userPrimaryColor = document.getElementById('primary-color').value;
            const userBackgroundColor = document.getElementById('bg-color').value;
            
            // Priority: User selection > Style defaults > Fallback
            // Always use user selection if it exists, regardless of what color it is
            const finalPrimaryColor = userPrimaryColor || (styleSettings.primaryColor || '#000000');
            const finalBackgroundColor = userBackgroundColor || (styleSettings.backgroundColor || '#FFFFFF');
            
            // Debug logging for color selection
            console.log('🎨 Color Selection Debug (JSON):');
            console.log('  Style:', quickStyle);
            console.log('  Style Default Primary:', styleSettings.primaryColor);
            console.log('  User Selected Primary:', userPrimaryColor);
            console.log('  Final Primary Color:', finalPrimaryColor);
            console.log('  Final Background Color:', finalBackgroundColor);
            
            const rawContent = document.getElementById('qr-content').value;
            const encodedContent = this.prepareContentForQR(rawContent, type);
            
            return {
                data: {
                    type: document.getElementById('qr-type').value,
                    content: encodedContent,
                    quickStyle: quickStyle,
                    primaryColor: finalPrimaryColor,
                    backgroundColor: finalBackgroundColor,
                    size: parseInt(document.getElementById('qr-size').value),
                    margin: parseInt(document.getElementById('qr-margin').value),
                    cornerStyle: document.getElementById('corner-style')?.value || 'square',
                    optimizeForSpeed: true,
                    language: this.currentLang
                },
                isMultipart: false,
                endpoint: '/api/QR/GenerateRapid'
            };
        }
    }

    getStyleSettings(style) {
        const styles = {
            classic: { primaryColor: '#000000', backgroundColor: '#FFFFFF' },
            modern: { primaryColor: '#007BFF', backgroundColor: '#F8F9FA' },
            colorful: { primaryColor: '#FF6B35', backgroundColor: '#FFF3E0' }
        };
        return styles[style] || styles.classic;
    }

    displayQRResult(result, generationTime) {
        const previewDiv = document.getElementById('qr-preview');
        if (!previewDiv) return;
        
        previewDiv.innerHTML = `
            <img src="data:image/png;base64,${result.qrCodeBase64}" 
                 class="img-fluid border rounded shadow-sm" 
                 alt="QR Code gerado em ${generationTime}s">
        `;
        
        // Show generation statistics
        this.showGenerationStats(generationTime);
        
        // Show download buttons
        const downloadSection = document.getElementById('download-section');
        if (downloadSection) {
            downloadSection.style.display = 'block';
        }
        
        // Save current data
        this.currentQR = {
            base64: result.qrCodeBase64,
            qrCodeBase64: result.qrCodeBase64, // Both properties for compatibility
            id: result.qrId,
            generationTime: generationTime
        };

        // Increment rate limit counter after successful generation
        this.incrementRateLimit();
        
        // Update counter for logged users
        if (result.remainingQRs !== undefined) {
            if (result.remainingQRs === -1 || result.remainingQRs === 2147483647 || result.remainingQRs >= 1000000) {
                // Logged user - show unlimited
                this.showUnlimitedCounter();
            } else {
                this.updateRemainingCounter(result.remainingQRs);
            }
        }
    }

    showGenerationStarted() {
        const button = document.getElementById('generate-btn');
        const spinner = button?.querySelector('.spinner-border');
        const timer = document.querySelector('.generation-timer');
        
        if (button) button.disabled = true;
        if (spinner) spinner.classList.remove('d-none');
        if (timer) timer.classList.remove('d-none');
        
        // Update timer in real time
        this.timerInterval = setInterval(() => {
            const elapsed = ((performance.now() - this.startTime) / 1000).toFixed(1);
            const timerSpan = timer?.querySelector('span');
            if (timerSpan) {
                timerSpan.textContent = `${elapsed}s`;
            }
        }, 100);
        
        // Preview loading
        const preview = document.getElementById('qr-preview');
        if (preview) {
            preview.innerHTML = `
                <div class="text-center p-4">
                    <div class="spinner-border text-primary mb-3" role="status"></div>
                    <p class="text-muted">${this.languageStrings[this.currentLang].generating}</p>
                    <div class="progress">
                        <div class="progress-bar progress-bar-striped progress-bar-animated" 
                             style="width: 100%"></div>
                    </div>
                </div>
            `;
        }
    }

    showGenerationStats(generationTime) {
        const statsDiv = document.querySelector('.generation-stats');
        const speedBadge = document.querySelector('.speed-badge');
        
        if (statsDiv) {
            statsDiv.classList.remove('d-none');
            const timeSpan = statsDiv.querySelector('.generation-time');
            if (timeSpan) {
                timeSpan.textContent = `${generationTime}s`;
            }
        }
        
        // Show speed badge
        if (speedBadge) {
            const strings = this.languageStrings[this.currentLang];
            let badgeText = strings.normal;
            let badgeClass = 'bg-secondary';
            
            if (generationTime < 1.0) {
                badgeText = strings.ultraFast;
                badgeClass = 'bg-success';
            } else if (generationTime < 2.0) {
                badgeText = strings.fast;
                badgeClass = 'bg-primary';
            }
            
            speedBadge.innerHTML = `
                <span class="badge ${badgeClass}">
                    <i class="fas fa-bolt"></i> ${badgeText}
                </span>
            `;
            speedBadge.classList.remove('d-none');
        }
    }

    hideGenerationLoading() {
        const button = document.getElementById('generate-btn');
        const spinner = button?.querySelector('.spinner-border');
        
        if (button) button.disabled = false;
        if (spinner) spinner.classList.add('d-none');
        
        if (this.timerInterval) {
            clearInterval(this.timerInterval);
            this.timerInterval = null;
        }
    }

    updateContentHints() {
        const type = document.getElementById('qr-type')?.value;
        const hintsElement = document.getElementById('content-hints');
        const vcardInterface = document.getElementById('vcard-interface');
        const contentTextarea = document.getElementById('qr-content');
        
        if (!hintsElement || !type) return;
        
        // Show/hide VCard interface based on type
        if (type === 'vcard') {
            if (vcardInterface) vcardInterface.style.display = 'block';
            if (contentTextarea) {
                contentTextarea.style.display = 'none';
                contentTextarea.removeAttribute('required');
            }
            hintsElement.textContent = 'Preencha os campos acima para criar seu cartão de visita digital';
            return; // Skip normal hints for VCard
        } else {
            if (vcardInterface) vcardInterface.style.display = 'none';
            if (contentTextarea) {
                contentTextarea.style.display = 'block';
                contentTextarea.setAttribute('required', 'required');
            }
        }
        
        const hints = {
            'pt-BR': {
                'url': 'Ex: https://www.exemplo.com.br',
                'text': 'Digite qualquer texto que desejar',
                'wifi': 'Nome da rede;Senha;Tipo de segurança (WPA/WEP)',
                'vcard': 'Nome;Telefone;Email;Empresa',
                'sms': 'Número;Mensagem',
                'email': 'email@exemplo.com;Assunto;Mensagem'
            },
            'es': {
                'url': 'Ej: https://www.ejemplo.com',
                'text': 'Escribe cualquier texto que desees',
                'wifi': 'Nombre de red;Contraseña;Tipo de seguridad (WPA/WEP)',
                'vcard': 'Nombre;Teléfono;Email;Empresa',
                'sms': 'Número;Mensaje',
                'email': 'email@ejemplo.com;Asunto;Mensagem'
            }
        };
        
        const langHints = hints[this.currentLang] || hints['pt-BR'];
        hintsElement.textContent = langHints[type] || 'Digite o conteúdo apropriado para o tipo selecionado';
    }

    changeLanguage(e) {
        e.preventDefault();
        this.currentLang = e.target.dataset.lang;
        this.updateLanguage();
        this.updateContentHints();
        
        // Save preference
        localStorage.setItem('qrrapido-lang', this.currentLang);
        
        // Track language change
        window.trackLanguageChange && window.trackLanguageChange('pt-BR', this.currentLang);
    }

    updateLanguage() {
        const strings = this.languageStrings[this.currentLang];
        
        // Update tagline
        const tagline = document.getElementById('tagline');
        if (tagline) {
            tagline.textContent = strings.tagline;
        }
        
        // Update language selector
        const langMap = { 'pt-BR': 'PT', 'es': 'ES', 'en': 'EN' };
        const currentLang = document.getElementById('current-lang');
        if (currentLang) {
            currentLang.textContent = langMap[this.currentLang];
        }
        
        // Update hints if type already selected
        const qrType = document.getElementById('qr-type');
        if (qrType?.value) {
            this.updateContentHints();
        }
    }

    handleLogoSelection(e) {
        const file = e.target.files[0];
        const logoPreview = document.getElementById('logo-preview');
        const logoFilename = document.getElementById('logo-filename');
        
        if (file) {
            // Validate file size (2MB max)
            if (file.size > 2 * 1024 * 1024) {
                this.showError('Logo muito grande. Máximo 2MB.');
                e.target.value = ''; // Clear the input
                logoPreview?.classList.add('d-none');
                return;
            }
            
            // Validate file type
            const allowedTypes = ['image/png', 'image/jpeg', 'image/jpg'];
            if (!allowedTypes.includes(file.type)) {
                this.showError('Formato inválido. Use PNG ou JPG.');
                e.target.value = ''; // Clear the input
                logoPreview?.classList.add('d-none');
                return;
            }
            
            // Show success feedback
            if (logoFilename) {
                const fileSizeKB = Math.round(file.size / 1024);
                logoFilename.textContent = `${file.name} (${fileSizeKB}KB)`;
            }
            logoPreview?.classList.remove('d-none');
            
            console.log('Logo selected:', file.name, file.size + ' bytes', file.type);
        } else {
            // Hide preview when no file selected
            logoPreview?.classList.add('d-none');
        }
    }

    handleCornerStyleChange(e) {
        const selectedStyle = e.target.value;
        const premiumStyles = ['rounded', 'circle', 'leaf'];
        
        if (premiumStyles.includes(selectedStyle)) {
            // Check if user is premium (we can detect this by checking if the option is disabled)
            const option = e.target.options[e.target.selectedIndex];
            if (option.disabled) {
                // Reset to square
                e.target.value = 'square';
                this.showUpgradeModal('Estilos de borda personalizados são exclusivos do plano Premium. Faça upgrade para usar esta funcionalidade.');
                return;
            }
        }
        
        console.log('Corner style selected:', selectedStyle);
    }

    applyQuickStyle(e) {
        const style = e.target.value;
        const settings = this.getStyleSettings(style);
        
        const primaryColor = document.getElementById('primary-color');
        const bgColor = document.getElementById('bg-color');
        
        if (primaryColor) primaryColor.value = settings.primaryColor;
        if (bgColor) bgColor.value = settings.backgroundColor;
    }

    updateStatsCounters() {
        // Simulate real-time counters
        setInterval(() => {
            const totalElement = document.getElementById('total-qrs');
            if (totalElement) {
                const current = parseFloat(totalElement.textContent.replace('K', '')) || 10.5;
                const newValue = (current + Math.random() * 0.1).toFixed(1);
                totalElement.textContent = `${newValue}K`;
            }
            
            // Update average time based on real performance
            const avgElement = document.getElementById('avg-generation-time');
            if (avgElement && window.qrRapidoStats) {
                const avg = window.qrRapidoStats.getAverageTime();
                avgElement.textContent = `${avg}s`;
            }
        }, 30000); // Update every 30 seconds
    }

    async initializeUserCounter() {
        try {
            const response = await fetch('/api/QR/GetUserStats');
            if (response.ok) {
                const stats = await response.json();
                console.log('User stats loaded:', stats);
                console.log('remainingCount:', stats.remainingCount, 'type:', typeof stats.remainingCount);
                console.log('isUnlimited:', stats.isUnlimited);
                
                // For logged users, always show unlimited (they all have unlimited QR codes)
                console.log('Calling showUnlimitedCounter directly for logged user');
                this.showUnlimitedCounter();
            } else {
                console.log('GetUserStats response not ok:', response.status);
            }
        } catch (error) {
            // If not authenticated or error, keep the default "Carregando..." text
            console.debug('User not authenticated or error loading stats:', error);
        }
    }

    trackGenerationEvent(type, time) {
        // Google Analytics
        if (typeof gtag !== 'undefined') {
            gtag('event', 'qr_generated', {
                'qr_type': type,
                'generation_time': parseFloat(time),
                'user_type': this.isPremiumUser() ? 'premium' : 'free',
                'language': this.currentLang
            });
        }
        
        // Internal statistics
        if (!window.qrRapidoStats) {
            window.qrRapidoStats = {
                times: [],
                getAverageTime: function() {
                    if (this.times.length === 0) return '1.2';
                    const avg = this.times.reduce((a, b) => a + b) / this.times.length;
                    return avg.toFixed(1);
                }
            };
        }
        window.qrRapidoStats.times.push(parseFloat(time));
    }

    updateSpeedStats(generationTime) {
        // Update the live statistics display
        const timeFloat = parseFloat(generationTime);
        
        // Update average time display in the stats cards
        // Find h5 elements in card bodies and look for one containing time info
        const cardElements = document.querySelectorAll('.card-body h5');
        cardElements.forEach(element => {
            // Look for elements containing time format (e.g., "1.2s", "0.8s", etc.)
            if (element.textContent.includes('s') && element.textContent.match(/\d+\.\d+s/)) {
                const avgTime = window.qrRapidoStats ? window.qrRapidoStats.getAverageTime() : generationTime;
                element.innerHTML = `<i class="fas fa-stopwatch"></i> ${avgTime}s`;
            }
        });
        
        // Update the generation timer in the header
        const timerElement = document.querySelector('.generation-timer span');
        if (timerElement) {
            timerElement.textContent = `${generationTime}s`;
        }
        
        // Update performance statistics
        if (!window.qrRapidoPerformance) {
            window.qrRapidoPerformance = {
                totalGenerations: 0,
                totalTime: 0,
                bestTime: Infinity,
                worstTime: 0
            };
        }
        
        const perf = window.qrRapidoPerformance;
        perf.totalGenerations++;
        perf.totalTime += timeFloat;
        perf.bestTime = Math.min(perf.bestTime, timeFloat);
        perf.worstTime = Math.max(perf.worstTime, timeFloat);
        
        // Log performance statistics for debugging
        console.log('📊 Performance Update:', {
            currentTime: `${generationTime}s`,
            averageTime: `${(perf.totalTime / perf.totalGenerations).toFixed(1)}s`,
            bestTime: `${perf.bestTime.toFixed(1)}s`,
            totalGenerations: perf.totalGenerations
        });
    }

    isPremiumUser() {
        return document.querySelector('.text-success')?.textContent.includes('Premium Ativo') || false;
    }

    async downloadQR(format) {
        if (!this.currentQR || !this.currentQR.qrCodeBase64) {
            this.showError('Nenhum QR Code gerado para download.');
            return;
        }
        
        try {
            const timestamp = new Date().toISOString().slice(0,10);
            const base64Data = this.currentQR.qrCodeBase64;
            
            if (format === 'png') {
                // Download PNG directly from base64
                const link = document.createElement('a');
                link.href = `data:image/png;base64,${base64Data}`;
                link.download = `qrrapido-${timestamp}.png`;
                document.body.appendChild(link);
                link.click();
                document.body.removeChild(link);
                
            } else if (format === 'svg') {
                // Convert PNG to SVG
                const svgData = await this.convertPngToSvg(base64Data);
                const link = document.createElement('a');
                link.href = `data:image/svg+xml;charset=utf-8,${encodeURIComponent(svgData)}`;
                link.download = `qrrapido-${timestamp}.svg`;
                document.body.appendChild(link);
                link.click();
                document.body.removeChild(link);
                
            } else if (format === 'pdf') {
                // Convert PNG to PDF
                const pdfBlob = await this.convertPngToPdf(base64Data);
                const url = window.URL.createObjectURL(pdfBlob);
                const link = document.createElement('a');
                link.href = url;
                link.download = `qrrapido-${timestamp}.pdf`;
                document.body.appendChild(link);
                link.click();
                document.body.removeChild(link);
                window.URL.revokeObjectURL(url);
            }
            
        } catch (error) {
            console.error('Download error:', error);
            this.showError(`Erro ao fazer download ${format.toUpperCase()}. Tente novamente.`);
        }
    }

    async convertPngToSvg(base64Data) {
        return new Promise((resolve) => {
            const img = new Image();
            img.onload = () => {
                const canvas = document.createElement('canvas');
                const ctx = canvas.getContext('2d');
                canvas.width = img.width;
                canvas.height = img.height;
                ctx.drawImage(img, 0, 0);
                
                // Create SVG with embedded base64 image
                const svgData = `<?xml version="1.0" encoding="UTF-8"?>
<svg width="${img.width}" height="${img.height}" xmlns="http://www.w3.org/2000/svg">
    <image width="${img.width}" height="${img.height}" href="data:image/png;base64,${base64Data}"/>
</svg>`;
                resolve(svgData);
            };
            img.src = `data:image/png;base64,${base64Data}`;
        });
    }

    async convertPngToPdf(base64Data) {
        return new Promise((resolve, reject) => {
            try {
                // Try to use jsPDF if available, otherwise use a simpler approach
                if (typeof window.jsPDF !== 'undefined') {
                    const pdf = new window.jsPDF();
                    const img = new Image();
                    img.onload = () => {
                        // Calculate dimensions to fit on page
                        const pdfWidth = pdf.internal.pageSize.getWidth();
                        const pdfHeight = pdf.internal.pageSize.getHeight();
                        const imgRatio = img.width / img.height;
                        
                        let width = Math.min(pdfWidth - 20, 150);
                        let height = width / imgRatio;
                        
                        if (height > pdfHeight - 20) {
                            height = pdfHeight - 20;
                            width = height * imgRatio;
                        }
                        
                        // Center on page
                        const x = (pdfWidth - width) / 2;
                        const y = (pdfHeight - height) / 2;
                        
                        pdf.addImage(`data:image/png;base64,${base64Data}`, 'PNG', x, y, width, height);
                        const pdfBlob = pdf.output('blob');
                        resolve(pdfBlob);
                    };
                    img.onerror = () => reject(new Error('Failed to load image'));
                    img.src = `data:image/png;base64,${base64Data}`;
                } else {
                    // Fallback: create a very simple PDF
                    this.createBasicPdf(base64Data).then(resolve).catch(reject);
                }
            } catch (error) {
                reject(error);
            }
        });
    }

    async createBasicPdf(base64Data) {
        // Load jsPDF dynamically if not available
        if (typeof window.jsPDF === 'undefined') {
            await this.loadJsPDF();
        }
        
        return new Promise((resolve) => {
            const pdf = new window.jsPDF();
            const img = new Image();
            img.onload = () => {
                // Add QR code to PDF
                const pdfWidth = pdf.internal.pageSize.getWidth();
                const size = Math.min(pdfWidth - 40, 100);
                const x = (pdfWidth - size) / 2;
                const y = 50;
                
                pdf.addImage(`data:image/png;base64,${base64Data}`, 'PNG', x, y, size, size);
                pdf.text('QR Code - QR Rapido', pdfWidth / 2, 30, { align: 'center' });
                
                const pdfBlob = pdf.output('blob');
                resolve(pdfBlob);
            };
            img.src = `data:image/png;base64,${base64Data}`;
        });
    }

    async loadJsPDF() {
        return new Promise((resolve, reject) => {
            if (typeof window.jsPDF !== 'undefined') {
                resolve();
                return;
            }
            
            const script = document.createElement('script');
            script.src = 'https://cdnjs.cloudflare.com/ajax/libs/jspdf/2.5.1/jspdf.umd.min.js';
            script.onload = () => {
                window.jsPDF = window.jspdf.jsPDF;
                resolve();
            };
            script.onerror = () => reject(new Error('Failed to load jsPDF'));
            document.head.appendChild(script);
        });
    }

    async saveToHistory() {
        if (!this.currentQR) return;
        
        try {
            const response = await fetch('/api/QR/SaveToHistory', {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                },
                body: JSON.stringify({
                    qrId: this.currentQR.id
                })
            });
            
            if (response.ok) {
                this.showSuccess(this.languageStrings[this.currentLang].success);
            } else {
                throw new Error('Failed to save');
            }
            
        } catch (error) {
            console.error('Save error:', error);
            this.showError('Erro ao salvar no histórico.');
        }
    }

    async checkAdFreeStatus() {
        try {
            const response = await fetch('/Account/AdFreeStatus');
            const status = await response.json();
            
            if (status.isAdFree) {
                this.hideAllAds();
                this.showAdFreeMessage(status.timeRemaining);
            }
            
        } catch (error) {
            console.error('Error checking ad-free status:', error);
        }
    }

    hideAllAds() {
        document.querySelectorAll('.ad-container').forEach(ad => {
            ad.style.display = 'none';
        });
    }

    showAdFreeMessage(timeRemaining) {
        if (timeRemaining <= 0) return;
        
        const existing = document.querySelector('.ad-free-notice');
        if (existing) return; // Already shown
        
        const message = document.createElement('div');
        message.className = 'alert alert-success text-center mb-3 ad-free-notice';
        message.innerHTML = `
            <i class="fas fa-crown text-warning"></i>
            <strong>Sessão sem anúncios ativa!</strong>
            Tempo restante: <span class="ad-free-countdown">${this.formatTime(timeRemaining)}</span>
            <a href="/Premium/Upgrade" class="btn btn-sm btn-warning ms-2">Tornar Permanente</a>
        `;
        
        const container = document.querySelector('.container');
        const row = container?.querySelector('.row');
        if (container && row) {
            container.insertBefore(message, row);
        }
    }

    formatTime(minutes) {
        if (minutes === 0) return '0m';
        
        const days = Math.floor(minutes / 1440);
        const hours = Math.floor((minutes % 1440) / 60);
        const mins = minutes % 60;
        
        if (days > 0) return `${days}d ${hours}h ${mins}m`;
        if (hours > 0) return `${hours}h ${mins}m`;
        return `${mins}m`;
    }

    showUpgradeModal(message) {
        const modal = document.createElement('div');
        modal.className = 'modal fade';
        modal.innerHTML = `
            <div class="modal-dialog">
                <div class="modal-content">
                    <div class="modal-header bg-warning">
                        <h5 class="modal-title">
                            <i class="fas fa-crown"></i> Upgrade para Premium
                        </h5>
                        <button type="button" class="btn-close" data-bs-dismiss="modal"></button>
                    </div>
                    <div class="modal-body">
                        <p>${message}</p>
                        <div class="row">
                            <div class="col-md-6">
                                <h6>Plano Atual (Free)</h6>
                                <ul class="list-unstyled">
                                    <li>❌ Limite de 10 QR/dia</li>
                                    <li>❌ Anúncios</li>
                                    <li>✅ QR básicos</li>
                                </ul>
                            </div>
                            <div class="col-md-6">
                                <h6>Premium (R$ 19,90/mês)</h6>
                                <ul class="list-unstyled">
                                    <li>✅ QR ilimitados</li>
                                    <li>✅ Sem anúncios</li>
                                    <li>✅ QR dinâmicos</li>
                                    <li>✅ Analytics</li>
                                    <li>✅ Suporte prioritário</li>
                                </ul>
                            </div>
                        </div>
                    </div>
                    <div class="modal-footer">
                        <button type="button" class="btn btn-secondary" data-bs-dismiss="modal">Cancelar</button>
                        <a href="/Premium/Upgrade" class="btn btn-warning">
                            <i class="fas fa-crown"></i> Fazer Upgrade
                        </a>
                    </div>
                </div>
            </div>
        `;
        
        document.body.appendChild(modal);
        const bsModal = new bootstrap.Modal(modal);
        bsModal.show();
        
        // Remove modal when closed
        modal.addEventListener('hidden.bs.modal', () => {
            document.body.removeChild(modal);
        });
    }

    updateRemainingCounter(remaining) {
        const counterElement = document.querySelector('.qr-counter');
        if (counterElement && remaining !== null && remaining !== undefined) {
            // If it's unlimited (any special value indicating unlimited)
            if (remaining === -1 || remaining >= 2147483647 || remaining > 1000000) {
                this.showUnlimitedCounter();
                return;
            }
            
            const remainingText = this.getLocalizedString('QRCodesRemainingToday');
            counterElement.textContent = `${remaining} ${remainingText}`;
            
            if (remaining <= 3) {
                counterElement.className = 'badge bg-warning qr-counter';
            }
            if (remaining === 0) {
                counterElement.className = 'badge bg-danger qr-counter';
            }
        }
    }

    showUnlimitedCounter() {
        console.log('showUnlimitedCounter called');
        const counterElement = document.querySelector('.qr-counter');
        if (counterElement) {
            counterElement.textContent = 'QR Codes ilimitados';
            counterElement.className = 'badge bg-success qr-counter';
            console.log('Set counter to: QR Codes ilimitados');
        } else {
            console.log('Counter element not found');
        }
    }

    showError(message) {
        this.showAlert(message, 'danger');
    }

    showSuccess(message) {
        this.showAlert(message, 'success');
    }

    showAlert(message, type) {
        // Create toast container if doesn't exist
        let toastContainer = document.getElementById('toast-container');
        if (!toastContainer) {
            toastContainer = document.createElement('div');
            toastContainer.id = 'toast-container';
            toastContainer.className = 'toast-container position-fixed top-0 end-0 p-3';
            toastContainer.style.zIndex = '1060';
            document.body.appendChild(toastContainer);
        }

        // Create toast element
        const toast = document.createElement('div');
        toast.className = `toast align-items-center text-bg-${type} border-0`;
        toast.setAttribute('role', 'alert');
        toast.innerHTML = `
            <div class="d-flex">
                <div class="toast-body">
                    <i class="fas fa-${type === 'danger' ? 'exclamation-triangle' : 'check-circle'}"></i>
                    ${message}
                </div>
                <button type="button" class="btn-close btn-close-white me-2 m-auto" data-bs-dismiss="toast"></button>
            </div>
        `;
        
        toastContainer.appendChild(toast);
        
        // Show toast
        const bsToast = new bootstrap.Toast(toast, {
            delay: type === 'success' ? 3000 : 5000,
            autohide: true
        });
        bsToast.show();
        
        // Remove from DOM after hidden
        toast.addEventListener('hidden.bs.toast', () => {
            if (toast.parentNode) {
                toast.parentNode.removeChild(toast);
            }
        });
    }

    setupRealTimePreview() {
        const contentField = document.getElementById('qr-content');
        const typeField = document.getElementById('qr-type');
        
        if (contentField && typeField) {
            let previewTimeout;
            const updatePreview = () => {
                clearTimeout(previewTimeout);
                previewTimeout = setTimeout(() => {
                    if (contentField.value.trim() && typeField.value) {
                        // Could implement real-time preview for premium users
                        console.log('Real-time preview update');
                    }
                }, 500);
            };
            
            contentField.addEventListener('input', updatePreview);
            typeField.addEventListener('change', updatePreview);
        }
    }
    
    // ============================================
    // SISTEMA DE FLUXO ASCENDENTE PROGRESSIVO
    // ============================================
    
    initializeProgressiveFlow() {
        // Estado inicial: apenas tipo habilitado, botão gerar desabilitado
        const qrContent = document.getElementById('qr-content');
        const vcardInterface = document.getElementById('vcard-interface');
        
        // FIXED: Don't disable content field initially - let enableContentFields handle it
        // The field should be available for typing once a type is selected
        
        // Ocultar interface vCard
        if (vcardInterface) {
            vcardInterface.style.display = 'none';
        }
        
        this.updateGenerateButton();
        
        // Setup URL validation event listeners
        this.setupURLValidationListeners();
        
        // Setup hint auto-hide timer
        this.setupHintAutoHide();
    }

    setupHintAutoHide() {
        const hint = document.getElementById('type-selection-hint');
        if (hint) {
            // Auto-hide after 30 seconds
            setTimeout(() => {
                if (hint && !hint.classList.contains('fade-out')) {
                    hint.classList.add('fade-out');
                    // Remove from DOM after animation
                    setTimeout(() => {
                        if (hint.parentNode) {
                            hint.style.display = 'none';
                        }
                    }, 1000); // 1s for fade-out animation
                }
            }, 30000); // 30 seconds
        }
    }
    
    setupURLValidationListeners() {
        const contentField = document.getElementById('qr-content');
        if (!contentField) return;
        
        // Auto-fix URL on blur (when user leaves the field)
        contentField.addEventListener('blur', () => {
            const type = document.getElementById('qr-type')?.value;
            
            if (type === 'url' && contentField.value.trim()) {
                const originalValue = contentField.value.trim();
                const fixedValue = this.autoFixURL(originalValue);
                
                if (originalValue !== fixedValue) {
                    contentField.value = fixedValue;
                    console.log('🔧 URL auto-corrigida:', originalValue, '→', fixedValue);
                    
                    // Revalidar após correção
                    this.updateGenerateButton();
                }
            }
        });
        
        // Real-time validation with debounce
        contentField.addEventListener('input', () => {
            const type = document.getElementById('qr-type')?.value;
            
            if (type === 'url') {
                // Debounce para não validar a cada caractere
                clearTimeout(contentField.validationTimeout);
                contentField.validationTimeout = setTimeout(() => {
                    this.updateGenerateButton();
                }, 500);
            }
        });
    }
    
    handleTypeSelection(type) {
        this.selectedType = type;
        
        if (type) {
            this.removeInitialHighlight();
            // Sempre habilitar campos de conteúdo após selecionar tipo
            this.enableContentFields(type);
            // Show guidance toast for the selected type
            this.showTypeGuidanceToast(type);
        } else {
            this.disableAllFields();
        }
        
        this.updateGenerateButton();
    }
    
    handleStyleSelection(style) {
        this.selectedStyle = style;
        this.updateGenerateButton();
    }
    
    handleContentChange(content) {
        const contentField = document.getElementById('qr-content');
        this.contentValid = this.validateContent(content);
        
        // Feedback visual para campo de conteúdo
        if (contentField) {
            this.validateField(contentField, this.contentValid, 'Conteúdo deve ter pelo menos 3 caracteres');
        }
        
        this.updateGenerateButton();
    }
    
    enableContentFields(type) {
        const contentGroup = document.getElementById('content-group');
        const vcardInterface = document.getElementById('vcard-interface');
        const wifiInterface = document.getElementById('wifi-interface');
        const smsInterface = document.getElementById('sms-interface');
        const emailInterface = document.getElementById('email-interface');
        const dynamicQRSection = document.getElementById('dynamic-qr-section');
        const urlPreview = document.getElementById('url-preview');

        // Hide all interfaces by default
        if (vcardInterface) vcardInterface.style.display = 'none';
        if (wifiInterface) wifiInterface.style.display = 'none';
        if (smsInterface) smsInterface.style.display = 'none';
        if (emailInterface) emailInterface.style.display = 'none';
        if (dynamicQRSection) dynamicQRSection.style.display = 'none';
        if (urlPreview) urlPreview.style.display = 'none';
        if (contentGroup) contentGroup.style.display = 'block';

        if (type === 'vcard') {
            // Para vCard, ocultar textarea e mostrar interface específica
            if (contentGroup) contentGroup.style.display = 'none';
            if (vcardInterface) {
                vcardInterface.style.display = 'block';
                this.enableVCardFields();
            }
        } else if (type === 'wifi') {
            // Para WiFi, ocultar textarea e mostrar interface específica
            if (contentGroup) contentGroup.style.display = 'none';
            if (wifiInterface) {
                wifiInterface.style.display = 'block';
            }
        } else if (type === 'sms') {
            // Para SMS, ocultar textarea e mostrar interface específica
            if (contentGroup) contentGroup.style.display = 'none';
            if (smsInterface) {
                smsInterface.style.display = 'block';
            }
        } else if (type === 'email') {
            // Para Email, ocultar textarea e mostrar interface específica
            if (contentGroup) contentGroup.style.display = 'none';
            if (emailInterface) {
                emailInterface.style.display = 'block';
            }
        } else if (type === 'url') {
            if (dynamicQRSection) dynamicQRSection.style.display = 'block';
            if (urlPreview) urlPreview.style.display = 'block';
            // CRITICAL FIX: Enable content field for URL type
            const qrContent = document.getElementById('qr-content');
            if(qrContent) {
                qrContent.disabled = false;
            }
        } else {
            // Para outros tipos, mostrar textarea
            if (contentGroup) contentGroup.style.display = 'block';
            const qrContent = document.getElementById('qr-content');
            if(qrContent) {
                qrContent.disabled = false;
            }
        }
    }
    
    enableVCardFields() {
        const requiredFields = ['vcard-name', 'vcard-mobile', 'vcard-email'];
        requiredFields.forEach(fieldId => {
            const field = document.getElementById(fieldId);
            if (field) {
                field.disabled = false;
                field.setAttribute('required', 'required');
            }
        });
    }
    
    disableAllFields() {
        // Resetar estado
        const qrContent = document.getElementById('qr-content');
        const vcardInterface = document.getElementById('vcard-interface');
        
        if (qrContent) {
            // FIXED: Don't disable content field, just clear it
            qrContent.value = '';
        }
        
        if (vcardInterface) {
            vcardInterface.style.display = 'none';
            // Limpar campos vCard
            const vcardFields = document.querySelectorAll('#vcard-interface input');
            vcardFields.forEach(field => {
                field.value = '';
                field.disabled = true;
            });
        }
        
        this.contentValid = false;
    }
    
    validateContent(content) {
        if (!content) return false;
        return content.trim().length >= 3;
    }
    
    validateVCardFields() {
        const nameField = document.getElementById('vcard-name');
        const mobileField = document.getElementById('vcard-mobile');
        const emailField = document.getElementById('vcard-email');
        
        const name = nameField?.value.trim() || '';
        const mobile = mobileField?.value.trim() || '';
        const email = emailField?.value.trim() || '';
        
        // Validação individual dos campos com feedback visual
        this.validateField(nameField, name !== '', 'Nome é obrigatório');
        this.validateField(mobileField, mobile !== '' && mobile.length >= 10, 'Telefone deve ter pelo menos 10 dígitos');
        this.validateField(emailField, email !== '' && email.includes('@'), 'Email válido é obrigatório');
        
        const isValid = name !== '' && mobile !== '' && email !== '' && email.includes('@') && mobile.length >= 10;
        this.contentValid = isValid;
        
        return isValid;
    }
    
    validateField(field, isValid, errorMessage) {
        if (!field) return;
        
        const feedbackElement = field.parentNode.querySelector('.invalid-feedback');
        
        if (isValid) {
            field.classList.remove('is-invalid');
            field.classList.add('is-valid');
            if (feedbackElement) {
                feedbackElement.style.display = 'none';
            }
        } else if (field.value.trim() !== '') {
            // Só mostrar erro se o campo tem conteúdo
            field.classList.remove('is-valid');
            field.classList.add('is-invalid');
            if (feedbackElement) {
                feedbackElement.textContent = errorMessage;
                feedbackElement.style.display = 'block';
            }
        } else {
            // Campo vazio, remover validações visuais
            field.classList.remove('is-valid', 'is-invalid');
            if (feedbackElement) {
                feedbackElement.style.display = 'none';
            }
        }
    }
    
    // ============================================
    // URL VALIDATION FUNCTIONS
    // ============================================
    
    isValidURL(url) {
        if (!url || typeof url !== 'string') return false;
        
        const trimmedUrl = url.trim();
        
        // Verificar se começa com http:// ou https://
        const hasProtocol = trimmedUrl.startsWith('http://') || trimmedUrl.startsWith('https://');
        
        // Verificar se tem pelo menos um ponto
        const hasDot = trimmedUrl.includes('.');
        
        // Verificar se não é só o protocolo
        const hasContent = trimmedUrl.length > 8; // mais que "https://"
        
        // Regex mais robusta
        const urlRegex = /^https?:\/\/.+\..+/i;
        
        return hasProtocol && hasDot && hasContent && urlRegex.test(trimmedUrl);
    }
    
    autoFixURL(url) {
        if (!url || typeof url !== 'string') return '';
        
        let fixedUrl = url.trim();
        
        // Se não tem protocolo, adicionar https://
        if (!fixedUrl.startsWith('http://') && !fixedUrl.startsWith('https://')) {
            fixedUrl = 'https://' + fixedUrl;
        }
        
        return fixedUrl;
    }
    
    showValidationError(message) {
        let errorDiv = document.getElementById('url-validation-error');
        
        if (!errorDiv) {
            // Criar div de erro se não existir
            errorDiv = document.createElement('div');
            errorDiv.id = 'url-validation-error';
            errorDiv.className = 'alert alert-danger mt-2';
            errorDiv.style.display = 'none';
            
            // Inserir após o campo de conteúdo
            const contentGroup = document.getElementById('content-group');
            if (contentGroup) {
                contentGroup.appendChild(errorDiv);
            }
        }
        
        errorDiv.innerHTML = `<small><i class="fas fa-exclamation-triangle"></i> ${message}</small>`;
        errorDiv.style.display = 'block';
    }
    
    clearValidationError() {
        const errorDiv = document.getElementById('url-validation-error');
        if (errorDiv) {
            errorDiv.style.display = 'none';
        }
    }
    
    updateGenerateButton() {
        const generateBtn = document.getElementById('generate-btn');
        if (!generateBtn) return;

        let isValid = false;
        const type = this.selectedType;

        if (type === 'url') {
            const contentField = document.getElementById('qr-content');
            const content = contentField?.value || '';
            const trimmedContent = content.trim();
            
            if (!trimmedContent) {
                this.showValidationError('URL é obrigatória');
                if (contentField) {
                    contentField.classList.remove('is-valid');
                    contentField.classList.add('is-invalid');
                }
                isValid = false;
            } else if (!this.isValidURL(trimmedContent)) {
                this.showValidationError('URL deve começar com http:// ou https:// e conter pelo menos um ponto (ex: https://google.com)');
                if (contentField) {
                    contentField.classList.remove('is-valid');
                    contentField.classList.add('is-invalid');
                }
                isValid = false;
            } else {
                this.clearValidationError();
                if (contentField) {
                    contentField.classList.remove('is-invalid');
                    contentField.classList.add('is-valid');
                }
                isValid = true;
            }
        } else if (type === 'text') {
            const contentField = document.getElementById('qr-content');
            const content = contentField?.value || '';
            isValid = content.trim().length >= 3;
            this.clearValidationError(); // Clear any URL validation errors
            if (contentField) {
                contentField.classList.remove('is-valid', 'is-invalid');
            }
        } else if (type === 'vcard') {
            isValid = this.validateVCardFields();
        } else if (type === 'wifi') {
            const data = window.wifiGenerator.collectWiFiData();
            isValid = data.ssid.trim() !== '';
            if (data.security !== 'nopass' && !data.password.trim()) {
                isValid = false;
            }
        } else if (type === 'sms') {
            const data = window.smsGenerator.collectSMSData();
            isValid = data.number.trim() !== '' && data.message.trim() !== '';
        } else if (type === 'email') {
            const data = window.emailGenerator.collectEmailData();
            isValid = data.to.trim() !== '' && data.subject.trim() !== '';
        }

        generateBtn.disabled = !isValid;

        if (isValid) {
            generateBtn.classList.remove('btn-secondary', 'disabled');
            generateBtn.classList.add('btn-primary');
        } else {
            generateBtn.classList.remove('btn-primary');
            generateBtn.classList.add('btn-secondary', 'disabled');
        }
    }
    
    // Remove destaque inicial quando tipo for selecionado
    removeInitialHighlight() {
        const typeField = document.getElementById('qr-type');
        const hint = document.getElementById('type-selection-hint');
        
        if (typeField && typeField.classList.contains('qr-type-highlight')) {
            typeField.classList.remove('qr-type-highlight');
        }
        
        if (hint && !hint.classList.contains('fade-out')) {
            hint.classList.add('fade-out');
            // Hide after animation
            setTimeout(() => {
                if (hint.parentNode) {
                    hint.style.display = 'none';
                }
            }, 1000);
        }
    }

    showTypeGuidanceToast(type) {
        // Get localized message based on QR type
        const messages = this.getTypeGuidanceMessages();
        const message = messages[type];
        
        if (message) {
            // Create info toast with 30 second duration
            const toast = this.createGuidanceToast(message);
            this.showGuidanceToast(toast, 30000); // 30 seconds
        }
    }

    getTypeGuidanceMessages() {
        // These should match the resource file keys
        // In a real implementation, these would come from server-side localization
        // For now, we'll use the JavaScript language strings or fallback to Portuguese
        return {
            'url': document.querySelector('[data-type-guide-url]')?.textContent || '🌐 Para gerar QR de URL, digite o endereço completo (ex: https://google.com)',
            'vcard': document.querySelector('[data-type-guide-vcard]')?.textContent || '👤 Para cartão de visita, preencha nome, telefone e email nos campos abaixo',
            'wifi': document.querySelector('[data-type-guide-wifi]')?.textContent || '📶 Para WiFi, informe nome da rede, senha e tipo de segurança',
            'sms': document.querySelector('[data-type-guide-sms]')?.textContent || '💬 Para SMS, digite o número do destinatário e a mensagem',
            'email': document.querySelector('[data-type-guide-email]')?.textContent || '📧 Para email, preencha destinatário, assunto e mensagem (opcional)',
            'text': document.querySelector('[data-type-guide-text]')?.textContent || '📝 Para texto livre, digite qualquer conteúdo que desejar'
        };
    }

    createGuidanceToast(message) {
        const toast = document.createElement('div');
        toast.className = 'toast align-items-center text-bg-info border-0';
        toast.setAttribute('role', 'alert');
        toast.style.minWidth = '400px';
        toast.innerHTML = `
            <div class="d-flex">
                <div class="toast-body fw-medium">
                    ${message}
                </div>
                <button type="button" class="btn-close btn-close-white me-2 m-auto" data-bs-dismiss="toast"></button>
            </div>
        `;
        return toast;
    }

    showGuidanceToast(toast, duration = 30000) {
        // Create toast container if doesn't exist (positioned below header stats)
        let toastContainer = document.getElementById('guidance-toast-container');
        if (!toastContainer) {
            toastContainer = document.createElement('div');
            toastContainer.id = 'guidance-toast-container';
            toastContainer.className = 'toast-container position-relative w-100 d-flex justify-content-center mb-3';
            toastContainer.style.zIndex = '1060';
            
            // Try to find existing toast container first (if manually positioned)
            const existingContainer = document.getElementById('guidance-toast-container');
            if (existingContainer) {
                // Use existing container that was manually positioned
                toastContainer = existingContainer;
            } else {
                // Find the main content area and insert after hero section
                const mainElement = document.querySelector('main[role="main"]');
                if (mainElement) {
                    // Insert at the beginning of main content
                    mainElement.insertBefore(toastContainer, mainElement.firstChild);
                } else {
                    // Fallback: find container and insert at top
                    const container = document.querySelector('.container');
                    if (container) {
                        container.insertBefore(toastContainer, container.firstChild);
                    }
                }
            }
        }

        toastContainer.appendChild(toast);
        
        // Show toast with custom duration
        const bsToast = new bootstrap.Toast(toast, {
            delay: duration,
            autohide: true
        });
        bsToast.show();
        
        // Remove from DOM after hidden
        toast.addEventListener('hidden.bs.toast', () => {
            if (toast.parentNode) {
                toast.parentNode.removeChild(toast);
            }
        });
    }
    
    // ============================================
    // FUNÇÕES DE CODIFICAÇÃO UTF-8
    // ============================================
    
    // Garantir codificação UTF-8 para todos os tipos de QR Code
    prepareContentForQR(content, type) {
        if (!content) return '';
        
        // Garantir que o conteúdo seja tratado como UTF-8
        try {
            // Verificar se há caracteres especiais
            const hasSpecialChars = /[^-]/.test(content);
            
            if (hasSpecialChars) {
                console.log('Caracteres especiais detectados, aplicando codificação UTF-8');
                // Forçar codificação UTF-8
                const encoder = new TextEncoder();
                const decoder = new TextDecoder();
                const encoded = encoder.encode(content);
                return decoder.decode(encoded);
            }
            
            return content;
        } catch (error) {
            console.warn('Erro na codificação UTF-8:', error);
            return content;
        }
    }
    
    // Validação de segurança para dados pessoais
    validateDataSecurity() {
        const placeholders = document.querySelectorAll('[placeholder]');
        placeholders.forEach(el => {
            const placeholder = el.placeholder;
            
            // Verificar dados pessoais em placeholders
            if (placeholder.includes('@') && placeholder.includes('gmail')) {
                console.warn('Dado pessoal detectado em placeholder:', placeholder);
                el.placeholder = 'seu.email@exemplo.com';
            }
            
            // Verificar números de telefone reais
            if (placeholder.match(/\d{11}/) && !placeholder.includes('99999')) {
                console.warn('Possível telefone real em placeholder:', placeholder);
                el.placeholder = el.placeholder.replace(/\d{11}/, '11999998888');
            }
        });
    }
    
    // Teste da codificação UTF-8
    testUTF8Encoding() {
        const testStrings = [
            'Ação rápida çáéíóú',
            'João Gonçalves',
            'Coração brasileiro',
            'Situação especial'
        ];
        
        console.group('🧪 Teste de Codificação UTF-8');
        testStrings.forEach(str => {
            const encoded = this.prepareContentForQR(str, 'text');
            console.log(`Original: "${str}"`);
            console.log(`Codificado: "${encoded}"`);
            console.log('---');
        });
        
        // Teste específico para vCard
        if (window.vcardGenerator) {
            const testName = 'João Gonçalves';
            const encoded = window.vcardGenerator.encodeQuotedPrintable(testName);
            console.log(`vCard Quoted-Printable test:`);
            console.log(`Original: "${testName}"`);
            console.log(`Encoded: "${encoded}"`);
        }
        
        console.groupEnd();
    }

    // Rate Limiting Methods
    initializeRateLimiting() {
        // Wait a bit for DOM to be fully ready
        setTimeout(() => {
            this.updateRateDisplayCounter();
        }, 100);
    }

    checkRateLimit() {
        // Check if user is logged in (unlimited access)
        const userStatus = document.getElementById('user-premium-status');
        console.log('🔍 Rate limit check - User status:', userStatus ? userStatus.value : 'not found');
        
        if (userStatus && userStatus.value === 'logged-in') {
            console.log('✅ User is logged in - unlimited access');
            return true; // Unlimited for logged users
        }

        // For anonymous users, check daily limit
        const today = new Date().toDateString();
        const cookieName = 'qr_daily_count';
        const rateLimitData = this.getCookie(cookieName);
        
        console.log('📅 Today:', today);
        console.log('🍪 Cookie data:', rateLimitData);

        let currentData = { date: today, count: 0 };
        
        if (rateLimitData) {
            try {
                currentData = JSON.parse(rateLimitData);
                console.log('📊 Parsed data:', currentData);
                
                // Reset count if it's a new day
                if (currentData.date !== today) {
                    console.log('🔄 New day detected, resetting count');
                    currentData = { date: today, count: 0 };
                }
            } catch (e) {
                console.log('❌ Error parsing cookie:', e);
                currentData = { date: today, count: 0 };
            }
        } else {
            console.log('🆕 No cookie found, starting fresh');
        }

        console.log('📈 Current count:', currentData.count);

        // Check if limit exceeded (don't increment here)
        if (currentData.count >= 3) {
            console.log('🚫 Rate limit exceeded');
            this.showRateLimitError();
            return false;
        }

        console.log('✅ Rate limit check passed');
        return true;
    }

    incrementRateLimit() {
        // Only increment after successful QR generation
        const userStatus = document.getElementById('user-premium-status');
        if (userStatus && userStatus.value === 'logged-in') {
            return; // No limits for logged users
        }

        const today = new Date().toDateString();
        const cookieName = 'qr_daily_count';
        const rateLimitData = this.getCookie(cookieName);

        let currentData = { date: today, count: 0 };
        
        if (rateLimitData) {
            try {
                currentData = JSON.parse(rateLimitData);
                if (currentData.date !== today) {
                    currentData = { date: today, count: 0 };
                }
            } catch (e) {
                currentData = { date: today, count: 0 };
            }
        }

        // Increment count and save
        currentData.count++;
        this.setCookie(cookieName, JSON.stringify(currentData), 1);
        
        // Update display counter
        this.updateRateDisplayCounter();
    }

    showRateLimitError() {
        const message = this.getLocalizedString('RateLimitExceeded') || 'Daily limit reached! Login for unlimited access.';
        this.showError(message);
    }

    updateRateDisplayCounter() {
        const counterElement = document.querySelector('.qr-counter');
        if (!counterElement) return;

        // Check user status
        const userStatus = document.getElementById('user-premium-status');
        
        if (userStatus && userStatus.value === 'premium') {
            // Premium users have unlimited QRs
            const unlimitedText = this.getLocalizedString('UnlimitedToday');
            counterElement.textContent = unlimitedText;
            counterElement.className = 'badge bg-success qr-counter';
            return;
        } else if (userStatus && userStatus.value === 'logged-in') {
            // Free logged users - we need to get their actual remaining count
            this.updateLoggedUserCounter();
            return;
        }

        // For anonymous users, show remaining count
        const today = new Date().toDateString();
        const cookieName = 'qr_daily_count';
        const rateLimitData = this.getCookie(cookieName);

        let remaining = 3;
        
        if (rateLimitData) {
            try {
                const currentData = JSON.parse(rateLimitData);
                if (currentData.date === today) {
                    remaining = Math.max(0, 3 - currentData.count);
                }
            } catch (e) {
                remaining = 3;
            }
        }

        const remainingText = this.getLocalizedString('QRCodesRemainingToday');
        counterElement.textContent = `${remaining} ${remainingText}`;
    }

    async updateLoggedUserCounter() {
        const counterElement = document.querySelector('.qr-counter');
        if (!counterElement) return;

        try {
            // Fetch user's remaining QR count from the server
            const response = await fetch('/api/QR/GetUserStats', {
                method: 'GET',
                headers: {
                    'Content-Type': 'application/json',
                }
            });

            if (response.ok) {
                const data = await response.json();
                
                if (data.isPremium) {
                    // Premium user - show unlimited
                    const unlimitedText = this.getLocalizedString('UnlimitedToday');
                    counterElement.textContent = unlimitedText;
                    counterElement.className = 'badge bg-success qr-counter';
                } else {
                    // Free user - show remaining count
                    const remaining = data.remainingCount || 0;
                    const remainingText = this.getLocalizedString('QRCodesRemainingToday');
                    if (remaining !== -1) { 
                        counterElement.textContent = `${remaining} ${remainingText}`;

                        counterElement.className = 'badge bg-primary qr-counter';
                        if (remaining <= 3) {
                            counterElement.className = 'badge bg-warning qr-counter';
                        }
                        if (remaining === 0) {
                            counterElement.className = 'badge bg-danger qr-counter';
                        }
                    }
                    else {
                        const unlimitedText = this.getLocalizedString('UnlimitedToday');
                        counterElement.textContent = unlimitedText;
                        counterElement.className = 'badge bg-success qr-counter';
                    }
                }
            } else {
                // Fallback to showing 50 remaining if API fails
                const remainingText = this.getLocalizedString('QRCodesRemainingToday');
                counterElement.textContent = `50 ${remainingText}`;
                counterElement.className = 'badge bg-primary qr-counter';
            }
        } catch (error) {
            console.warn('Failed to fetch user stats:', error);
            // Fallback to showing 50 remaining if API fails
            const remainingText = this.getLocalizedString('QRCodesRemainingToday');
            counterElement.textContent = `50 ${remainingText}`;
            counterElement.className = 'badge bg-primary qr-counter';
        }
    }

    getLocalizedString(key) {
        // Try to get from server-side localization first
        const element = document.querySelector(`[data-localized="${key}"]`);
        if (element) {
            const text = element.textContent.trim() || element.value;
            if (text) return text;
        }
        
        // Fallback to client-side strings
        if (this.languageStrings[this.currentLang] && this.languageStrings[this.currentLang][key]) {
            return this.languageStrings[this.currentLang][key];
        }
        
        // Default fallbacks based on key
        const defaults = {
            'UnlimitedToday': 'Ilimitado hoje',
            'QRCodesRemainingToday': 'QR codes restantes hoje',
            'RateLimitExceeded': 'Limite diário atingido! Faça login para acesso ilimitado.'
        };
        
        return defaults[key] || key;
    }

    setCookie(name, value, days) {
        const expires = new Date();
        expires.setTime(expires.getTime() + (days * 24 * 60 * 60 * 1000));
        document.cookie = `${name}=${value};expires=${expires.toUTCString()};path=/;SameSite=Strict`;
    }

    getCookie(name) {
        const nameEQ = name + "=";
        const ca = document.cookie.split(';');
        for (let i = 0; i < ca.length; i++) {
            let c = ca[i];
            while (c.charAt(0) === ' ') c = c.substring(1, c.length);
            if (c.indexOf(nameEQ) === 0) return c.substring(nameEQ.length, c.length);
        }
        return null;
    }

    // Debug/reset function - call from console if needed
    resetRateLimit() {
        // Multiple ways to clear the cookie
        document.cookie = 'qr_daily_count=; expires=Thu, 01 Jan 1970 00:00:00 UTC; path=/;';
        document.cookie = 'qr_daily_count=; expires=Thu, 01 Jan 1970 00:00:00 UTC; path=/; domain=' + window.location.hostname + ';';
        document.cookie = 'qr_daily_count=; max-age=0; path=/;';
        
        // Also clear from storage if exists
        if (typeof Storage !== "undefined") {
            localStorage.removeItem('qr_daily_count');
            sessionStorage.removeItem('qr_daily_count');
        }
        
        this.updateRateDisplayCounter();
        console.log('🧹 Rate limit completely reset!');
        console.log('🍪 All cookies:', document.cookie);
    }
}

// Initialize when DOM loads
document.addEventListener('DOMContentLoaded', () => {
    window.qrGenerator = new QRRapidoGenerator();
    window.vcardGenerator = new VCardGenerator();
    window.wifiGenerator = new WiFiQRGenerator();
    window.smsGenerator = new SMSQRGenerator();
    window.emailGenerator = new EmailQRGenerator();
    window.dynamicQRManager = new DynamicQRManager();
    
    // Initialize AdSense if necessary
    if (window.adsbygoogle && document.querySelector('.adsbygoogle')) {
        (adsbygoogle = window.adsbygoogle || []).push({});
    }
});

class DynamicQRManager {
    constructor() {
        this.initializeDynamicQR();
    }

    initializeDynamicQR() {
        // Verificar se usuário é premium
        this.isPremium = this.checkUserPremium();
        
        // Configurar interface baseado no status
        this.setupPremiumInterface();
        
        // Event listeners
        this.setupEventListeners();
        
        // Preview inicial
        this.updatePreview();
    }


    checkUserPremium() {
        // IMPLEMENTAR: verificar se usuário atual é premium
        // Pode ser via elemento hidden, variável global, ou chamada AJAX
        
        // Exemplo 1: Via elemento hidden
        const premiumStatus = document.getElementById('user-premium-status');
        if (premiumStatus) {
            return premiumStatus.value === 'true';
        }
        
        // Exemplo 2: Via variável global
        if (window.userInfo && window.userInfo.isPremium !== undefined) {
            return window.userInfo.isPremium;
        }
        
        // Fallback: assumir não-premium
        return false;
    }

    setupPremiumInterface() {
        const toggleContainer = document.getElementById('dynamic-toggle-container');
        const upgradePrompt = document.querySelector('.premium-upgrade-prompt');
        
        if (this.isPremium) {
            // Usuário premium: mostrar toggle funcional
            if(toggleContainer) toggleContainer.style.display = 'block';
            if (upgradePrompt) upgradePrompt.style.display = 'none';
        } else {
            // Usuário não-premium: mostrar prompt de upgrade
            if(toggleContainer) toggleContainer.style.display = 'none';
            if (upgradePrompt) upgradePrompt.style.display = 'block';
        }
    }

    setupEventListeners() {
        // Toggle do QR Dinâmico
        const dynamicToggle = document.getElementById('qr-dynamic-toggle');
        if (dynamicToggle) {
            dynamicToggle.addEventListener('change', () => {
                this.updatePreview();
            });
        }

        // Campo URL
        const urlField = document.getElementById('qr-content');
        if (urlField) {
            urlField.addEventListener('input', () => {
                this.updatePreview();
            });
        }
    }

    updatePreview() {
        const urlField = document.getElementById('qr-content');
        const dynamicToggle = document.getElementById('qr-dynamic-toggle');
        const finalUrlDisplay = document.getElementById('final-url-display');
        const typeDisplay = document.getElementById('qr-type-display');
        
        if (!urlField || !finalUrlDisplay || !typeDisplay) return;
        
        const originalUrl = urlField.value;
        const isDynamic = dynamicToggle && dynamicToggle.checked && this.isPremium;
        
        if (isDynamic && originalUrl) {
            // QR Dinâmico: mostra URL do QRRapido
            finalUrlDisplay.textContent = `https://qrrapido.site/r/{ID_UNICO}`;
            typeDisplay.textContent = "QR Code Dinâmico com Analytics ";
            typeDisplay.className = "text-success fw-bold";
        } else {
            // QR Estático: mostra URL original
            finalUrlDisplay.textContent = originalUrl || 'Digite uma URL...';
            typeDisplay.textContent = "QR Code Estático";
            typeDisplay.className = "text-muted";
        }
    }

    // Método para integração com collectFormData()
    getDynamicQRData() {
        const dynamicToggle = document.getElementById('qr-dynamic-toggle');
        const isDynamic = dynamicToggle && dynamicToggle.checked && this.isPremium;
        
        return {
            isDynamic: isDynamic,
            originalUrl: document.getElementById('qr-content').value,
            requiresPremium: !this.isPremium && isDynamic
        };
    }
}

class SMSQRGenerator {
    constructor() {
        this.initializeSMSInterface();
    }

    initializeSMSInterface() {
        // Atualizar preview em tempo real
        const fieldsToWatch = ['sms-number', 'sms-message'];
        fieldsToWatch.forEach(fieldId => {
            const element = document.getElementById(fieldId);
            if (element) {
                element.addEventListener('input', () => this.updatePreview());
                element.addEventListener('change', () => this.updatePreview());
            }
        });

        // Inicializar preview
        this.updatePreview();
    }

    updatePreview() {
        const smsString = this.generateSMSString();
        const previewElement = document.getElementById('sms-preview-text');
        if (previewElement) {
            previewElement.textContent = smsString;
        }
    }

    generateSMSString() {
        const data = this.collectSMSData();
        
        if (!data.number || !data.message) {
            return 'SMSTO::';
        }

        return `SMSTO:${data.number}:${data.message}`;
    }

    collectSMSData() {
        return {
            number: document.getElementById('sms-number')?.value || '',
            message: document.getElementById('sms-message')?.value || ''
        };
    }

    validateSMSData() {
        const data = this.collectSMSData();
        const errors = [];

        if (!data.number.trim()) {
            errors.push('Número do celular é obrigatório');
        }

        if (!data.message.trim()) {
            errors.push('Mensagem é obrigatória');
        }

        // Validação de telefone brasileiro básica
        const phoneRegex = /^\d{10,11}$/;
        if (data.number && !phoneRegex.test(data.number.replace(/\D/g, ''))) {
            errors.push('Número deve ter 10 ou 11 dígitos (DDD + número)');
        }

        return errors;
    }
}

class EmailQRGenerator {
    constructor() {
        this.initializeEmailInterface();
    }

    initializeEmailInterface() {
        // Atualizar preview em tempo real
        const fieldsToWatch = ['email-to', 'email-subject', 'email-body'];
        fieldsToWatch.forEach(fieldId => {
            const element = document.getElementById(fieldId);
            if (element) {
                element.addEventListener('input', () => this.updatePreview());
                element.addEventListener('change', () => this.updatePreview());
            }
        });

        // Inicializar preview
        this.updatePreview();
    }

    updatePreview() {
        const emailString = this.generateEmailString();
        const previewElement = document.getElementById('email-preview-text');
        if (previewElement) {
            previewElement.textContent = emailString;
        }
    }

    generateEmailString() {
        const data = this.collectEmailData();
        
        if (!data.to) {
            return 'mailto:?subject=&body=';
        }

        let emailString = `mailto:${data.to}`;
        const params = [];

        if (data.subject) {
            params.push(`subject=${encodeURIComponent(data.subject)}`);
        }

        if (data.body) {
            params.push(`body=${encodeURIComponent(data.body)}`);
        }

        if (params.length > 0) {
            emailString += '?' + params.join('&');
        }

        return emailString;
    }

    collectEmailData() {
        return {
            to: document.getElementById('email-to')?.value || '',
            subject: document.getElementById('email-subject')?.value || '',
            body: document.getElementById('email-body')?.value || ''
        };
    }

    validateEmailData() {
        const data = this.collectEmailData();
        const errors = [];

        if (!data.to.trim()) {
            errors.push('Email destinatário é obrigatório');
        }

        if (!data.subject.trim()) {
            errors.push('Assunto é obrigatório');
        }

        // Validação básica de email
        const emailRegex = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
        if (data.to && !emailRegex.test(data.to)) {
            errors.push('Email destinatário inválido');
        }

        return errors;
    }
}

class WiFiQRGenerator {
    constructor() {
        this.initializeWiFiInterface();
    }

    initializeWiFiInterface() {
        // Radio buttons: usar name para group
        document.querySelectorAll('input[name="wifi-security"]').forEach(radio => {
            radio.addEventListener('change', () => {
                this.togglePasswordField();
                this.updatePreview();
            });
        });
        
        // Campos individuais: usar IDs únicos
        const fieldsToWatch = ['wifi-ssid', 'wifi-password', 'wifi-hidden'];
        fieldsToWatch.forEach(fieldId => {
            const element = document.getElementById(fieldId);
            if (element) {
                element.addEventListener('input', () => this.updatePreview());
                element.addEventListener('change', () => this.updatePreview());
            }
        });

        const togglePassword = document.getElementById('toggle-password');
        if (togglePassword) {
            togglePassword.addEventListener('click', () => {
                this.togglePasswordVisibility();
            });
        }

        // Inicializar estado
        this.togglePasswordField();
        this.updatePreview();
    }

    togglePasswordField() {
        const selectedRadio = document.querySelector('input[name="wifi-security"]:checked');
        const securityType = selectedRadio ? selectedRadio.value : 'WPA';
        
        const passwordGroup = document.getElementById('wifi-password-group');
        const passwordInput = document.getElementById('wifi-password');
        
        if (securityType === 'nopass') {
            passwordGroup.style.display = 'none';
            passwordInput.removeAttribute('required');
            passwordInput.value = '';
        } else {
            passwordGroup.style.display = 'block';
            passwordInput.setAttribute('required', 'required');
        }
    }

    togglePasswordVisibility() {
        const passwordInput = document.getElementById('wifi-password');
        const toggleIcon = document.getElementById('toggle-password');

        if (passwordInput.type === 'password') {
            passwordInput.type = 'text';
            toggleIcon.className = 'fas fa-eye-slash';
        } else {
            passwordInput.type = 'password';
            toggleIcon.className = 'fas fa-eye';
        }
    }

    updatePreview() {
        const wifiString = this.generateWiFiString();
        const previewText = document.getElementById('wifi-preview-text');
        if(previewText) {
            previewText.textContent = wifiString;
        }
    }

    generateWiFiString() {
        const data = this.collectWiFiData();
        
        // Validar dados mínimos
        if (!data.ssid) {
            return 'WIFI:T:WPA;S:;P:;H:false;;';
        }

        // Escapar caracteres especiais
        const ssid = this.escapeWiFiString(data.ssid);
        const password = this.escapeWiFiString(data.password);

        // Construir string WiFi
        return `WIFI:T:${data.security};S:${ssid};P:${password};H:${data.hidden};;`;
    }

    collectWiFiData() {
        return {
            ssid: document.getElementById('wifi-ssid').value,
            security: document.querySelector('input[name="wifi-security"]:checked')?.value || 'WPA',
            password: document.getElementById('wifi-password').value,
            hidden: document.getElementById('wifi-hidden').checked.toString()
        };
    }

    escapeWiFiString(str) {
        if (!str) return '';
        // Escapar caracteres especiais do formato WiFi
        return str.replace(/[\\;,:"]/g, '\\escapeWiFiString(str) { if (!str) return; }');

        // Escapar caracteres especiais do formato WiFi
        //return str.replace(/[\\;,:""]/g, '\\document.addEventListener('DOMContentLoaded', () => {
        //    window.qrGenerator = new QRRapidoGenerator();
        //    window.vcardGenerator = new VCardGenerator();
    
        //    // Initialize AdSense if necessary
        //    if (window.adsbygoogle && document.querySelector('.adsbygoogle')) {
        //        (adsbygoogle = window.adsbygoogle || []).push({});
        //    }
        //});
        return str.replace(/[\\;,:"']/g, '\\$&');

        // VCard Generator Class');
    }

    validateWiFiData() {
        const data = this.collectWiFiData();
        const errors = [];

        // Validações obrigatórias
        if (!data.ssid.trim()) {
            errors.push('Nome da rede (SSID) é obrigatório');
        }

        // Validação de senha conforme tipo de segurança
        if ((data.security === 'WPA' || data.security === 'WEP') && !data.password.trim()) {
            errors.push('Senha é obrigatória para redes protegidas');
        }

        // Validação de comprimento
        if (data.ssid.length > 32) {
            errors.push('Nome da rede deve ter no máximo 32 caracteres');
        }

        if (data.password.length > 63) {
            errors.push('Senha deve ter no máximo 63 caracteres');
        }

        // Validação WEP específica
        if (data.security === 'WEP' && data.password) {
            const validWEPLengths = [5, 10, 13, 26]; // WEP 64/128 bit
            if (!validWEPLengths.includes(data.password.length)) {
                errors.push('Senha WEP deve ter 5, 10, 13 ou 26 caracteres');
            }
        }

        return errors;
    }
}

// VCard Generator Class

class VCardGenerator {
    constructor() {
        this.initializeVCardInterface();
    }
    
    // Função para codificar caracteres especiais usando Quoted-Printable
    encodeQuotedPrintable(text) {
        if (!text) return '';
        
        return text.replace(/[^\u0020-\u007E]/g, (char) => {
            // Para caracteres especiais comuns do português, usar codificação UTF-8
            const utf8Bytes = new TextEncoder().encode(char);
            return Array.from(utf8Bytes)
                .map(byte => `=${byte.toString(16).toUpperCase().padStart(2, '0')}`)
                .join('');
        });
    }
    
    // Função para preparar texto com codificação adequada
    prepareTextForVCard(text, needsEncoding = true) {
        if (!text) return '';
        
        const trimmedText = text.trim();
        if (!needsEncoding) return trimmedText;
        
        // Verifica se há caracteres especiais que precisam de codificação
        const hasSpecialChars = /[^\u0020-\u007E]/.test(trimmedText);
        
        if (hasSpecialChars) {
            return `CHARSET=UTF-8;ENCODING=QUOTED-PRINTABLE:${this.encodeQuotedPrintable(trimmedText)}`;
        }
        
        return trimmedText;
    }

    initializeVCardInterface() {
        // Show/hide optional fields based on checkboxes
        document.querySelectorAll('#vcard-interface .form-check-input').forEach(checkbox => {
            checkbox.addEventListener('change', (e) => {
                const groupId = e.target.id.replace('enable-', '') + '-group';
                const group = document.getElementById(groupId);
                if (group) {
                    group.style.display = e.target.checked ? 'block' : 'none';
                    // Clear values when hiding fields
                    if (!e.target.checked) {
                        const inputs = group.querySelectorAll('input');
                        inputs.forEach(input => input.value = '');
                    }
                }
                this.updatePreview();
            });
        });

        // Update preview in real-time
        document.querySelectorAll('#vcard-interface input').forEach(input => {
            input.addEventListener('input', () => this.updatePreview());
            input.addEventListener('blur', () => this.validateField(input));
        });
    }

    updatePreview() {
        const vcard = this.generateVCardContent();
        const previewElement = document.getElementById('vcard-preview-text');
        if (previewElement) {
            previewElement.textContent = vcard;
        }
    }

    generateVCardContent() {
        const data = this.collectVCardData();
        
        let vcard = 'BEGIN:VCARD\nVERSION:3.0\nCHARSET=UTF-8\n';
        
        // Nome (obrigatório)
        if (data.name) {
            const nameParts = data.name.trim().split(' ');
            const firstName = nameParts[0] || '';
            const lastName = nameParts.slice(1).join(' ') || '';
            
            // Codificar nome se necessário
            const encodedLastName = this.prepareTextForVCard(lastName);
            const encodedFirstName = this.prepareTextForVCard(firstName);
            const encodedFullName = this.prepareTextForVCard(data.name.trim());
            
            vcard += `N:${encodedLastName};${encodedFirstName}\n`;
            vcard += `FN:${encodedFullName}\n`;
        }
        
        // Empresa
        if (data.company) {
            const encodedCompany = this.prepareTextForVCard(data.company);
            vcard += `ORG:${encodedCompany}\n`;
        }
        
        // Título
        if (data.title) {
            const encodedTitle = this.prepareTextForVCard(data.title);
            vcard += `TITLE:${encodedTitle}\n`;
        }
        
        // Endereço
        if (data.address || data.city || data.state || data.zip) {
            const encodedAddress = this.prepareTextForVCard(data.address || '');
            const encodedCity = this.prepareTextForVCard(data.city || '');
            const encodedState = this.prepareTextForVCard(data.state || '');
            const encodedZip = this.prepareTextForVCard(data.zip || '', false); // ZIP não precisa de codificação especial
            const encodedCountry = this.prepareTextForVCard('Brasil');
            
            const addr = `;;${encodedAddress};${encodedCity};${encodedState};${encodedZip};${encodedCountry}`;
            vcard += `ADR:${addr}\n`;
        }
        
        // Telefones
        if (data.phone) vcard += `TEL;WORK;VOICE:${data.phone}\n`;
        if (data.mobile) vcard += `TEL;CELL:${data.mobile}\n`;
        
        // Email
        if (data.email) vcard += `EMAIL;WORK;INTERNET:${data.email}\n`;
        
        // Website
        if (data.website) vcard += `URL:${data.website}\n`;
        
        vcard += 'END:VCARD';
        
        return vcard;
    }

    collectVCardData() {
        return {
            name: document.getElementById('vcard-name')?.value?.trim() || '',
            mobile: document.getElementById('vcard-mobile')?.value?.trim() || '',
            email: document.getElementById('vcard-email')?.value?.trim() || '',
            company: document.getElementById('enable-company')?.checked ? 
                (document.getElementById('vcard-company')?.value?.trim() || '') : '',
            title: document.getElementById('enable-title')?.checked ? 
                (document.getElementById('vcard-title')?.value?.trim() || '') : '',
            website: document.getElementById('enable-website')?.checked ? 
                (document.getElementById('vcard-website')?.value?.trim() || '') : '',
            address: document.getElementById('enable-address')?.checked ? 
                (document.getElementById('vcard-address')?.value?.trim() || '') : '',
            city: document.getElementById('enable-address')?.checked ? 
                (document.getElementById('vcard-city')?.value?.trim() || '') : '',
            state: document.getElementById('enable-address')?.checked ? 
                (document.getElementById('vcard-state')?.value?.trim() || '') : '',
            zip: document.getElementById('enable-address')?.checked ? 
                (document.getElementById('vcard-zip')?.value?.trim() || '') : '',
            phone: document.getElementById('enable-phone')?.checked ? 
                (document.getElementById('vcard-phone')?.value?.trim() || '') : ''
        };
    }

    validateVCardData() {
        const data = this.collectVCardData();
        const errors = [];

        // Required field validations
        if (!data.name) errors.push('Nome é obrigatório');
        if (!data.mobile) errors.push('Telefone celular é obrigatório');
        if (!data.email) errors.push('Email é obrigatório');

        // Format validations
        if (data.email && !this.isValidEmail(data.email)) {
            errors.push('Email inválido');
        }
        
        if (data.website && !this.isValidURL(data.website)) {
            errors.push('Website inválido (deve começar com http:// ou https://)');
        }

        if (data.mobile && !this.isValidPhone(data.mobile)) {
            errors.push('Telefone celular inválido (deve ter 10-11 dígitos)');
        }

        if (data.phone && !this.isValidPhone(data.phone)) {
            errors.push('Telefone fixo inválido (deve ter 10-11 dígitos)');
        }

        return errors;
    }

    validateField(input) {
        const value = input.value.trim();
        let isValid = true;
        let message = '';

        switch (input.id) {
            case 'vcard-email':
                if (value && !this.isValidEmail(value)) {
                    isValid = false;
                    message = 'Email inválido';
                }
                break;
            case 'vcard-website':
                if (value && !this.isValidURL(value)) {
                    isValid = false;
                    message = 'Website inválido (deve começar com http:// ou https://)';
                }
                break;
            case 'vcard-mobile':
            case 'vcard-phone':
                if (value && !this.isValidPhone(value)) {
                    isValid = false;
                    message = 'Telefone inválido (apenas números, 10-11 dígitos)';
                }
                break;
        }

        // Update field validation state
        if (isValid) {
            input.classList.remove('is-invalid');
            input.classList.add('is-valid');
        } else {
            input.classList.remove('is-valid');
            input.classList.add('is-invalid');
            // Show error message
            const feedback = input.parentNode.querySelector('.invalid-feedback');
            if (feedback) {
                feedback.textContent = message;
            }
        }

        return isValid;
    }

    isValidEmail(email) {
        return /^[^ @]+@[^ @]+\.[^ @]+$/.test(email);
    }

    isValidURL(url) {
        try {
            new URL(url);
            return url.startsWith('http://') || url.startsWith('https://');
        } catch {
            return false;
        }
    }

    isValidPhone(phone) {
        // Brazilian phone validation (DDD + number)
        const digitsOnly = phone.replace(/\D/g, '');
        return /^\d{10,11}$/.test(digitsOnly);
    }

    // Method to be called by main QR generator
    getVCardContent() {
        const errors = this.validateVCardData();
        if (errors.length > 0) {
            throw new Error('Erro na validação: ' + errors.join(', '));
        }
        return this.generateVCardContent();
    }
}

// Global functions for ad control
window.QRApp = {
    refreshAds: function() {
        if (window.adsbygoogle) {
            document.querySelectorAll('.adsbygoogle').forEach(ad => {
                (adsbygoogle = window.adsbygoogle || []).push({});
            });
        }
    },
    
    hideAds: function() {
        document.querySelectorAll('.ad-container').forEach(ad => {
            ad.style.display = 'none';
        });
    }
};

// Google Analytics 4 Event Tracking
window.trackLanguageChange = function(from, to) {
    if (typeof gtag !== 'undefined') {
        gtag('event', 'language_change', {
            'from_language': from,
            'to_language': to
        });
    }
};

window.trackUpgradeClick = function(location) {
    if (typeof gtag !== 'undefined') {
        gtag('event', 'upgrade_click', {
            'click_location': location
        });
    }
};