@{
    ViewData["Title"] = ViewBag.PageTitle;
}

<div class="container-fluid">
    <div class="row">
        <div class="col-12">
            <div class="text-center mb-4">
                <h1 class="display-5">@ViewBag.PageTitle</h1>
                <p class="lead text-muted">@ViewBag.PageDescription</p>
            </div>
        </div>
    </div>

    <div class="row justify-content-center">
        <div class="col-lg-10 col-xl-8">
            <div class="card shadow-sm">
                <div class="card-header bg-primary text-white">
                    <h5 class="mb-0">
                        <i class="bi bi-file-earmark-image me-2"></i>Conversor de Imagens
                    </h5>
                </div>
                <div class="card-body">
                    @if (ViewBag.ConversionError != null)
                    {
                        <div class="alert alert-danger" role="alert">
                            <i class="bi bi-exclamation-triangle-fill me-2"></i>
                            @ViewBag.ConversionError
                        </div>
                    }

                    <!-- Navigation Tabs -->
                    <ul class="nav nav-tabs mb-4" id="converterTabs" role="tablist">
                        <li class="nav-item" role="presentation">
                            <button class="nav-link active" id="heic-to-jpg-tab" data-bs-toggle="tab" data-bs-target="#heic-to-jpg" type="button" role="tab" aria-controls="heic-to-jpg" aria-selected="true">
                                <i class="bi bi-arrow-right me-2"></i>@ViewBag.HeicToJpgTabTitle
                            </button>
                        </li>
                        <li class="nav-item" role="presentation">
                            <button class="nav-link" id="jpg-to-heic-tab" data-bs-toggle="tab" data-bs-target="#jpg-to-heic" type="button" role="tab" aria-controls="jpg-to-heic" aria-selected="false">
                                <i class="bi bi-arrow-left me-2"></i>@ViewBag.JpgToHeicTabTitle
                            </button>
                        </li>
                    </ul>

                    <!-- Tab Content -->
                    <div class="tab-content" id="converterTabContent">
                        <!-- HEIC to JPG Tab -->
                        <div class="tab-pane fade show active" id="heic-to-jpg" role="tabpanel" aria-labelledby="heic-to-jpg-tab">
                            <form id="heicToJpgForm" asp-action="ConvertHeicToJpg" method="post" enctype="multipart/form-data" class="needs-validation">
                                <div asp-validation-summary="ModelOnly" class="alert alert-danger" role="alert"></div>

                                <div class="mb-4">
                                    <label for="heicFile" class="form-label fw-semibold">@ViewBag.HeicFileInputLabel</label>
                                    <input class="form-control" type="file" id="heicFile" name="heicFile" accept=".heic,.HEIC,.heif,.HEIF" required>
                                    <div class="form-text">
                                        <i class="bi bi-info-circle me-1"></i>Formatos aceitos: .heic, .HEIC, .heif, .HEIF (máx. 10MB para preview)
                                    </div>
                                    <div class="invalid-feedback">
                                        Por favor, selecione um arquivo HEIC válido.
                                    </div>
                                </div>

                                <div class="d-grid gap-2">
                                    <button type="button" id="convertPreviewBtn" class="btn btn-primary">
                                        <i class="bi bi-eye me-2"></i>Converter e Visualizar
                                    </button>
                                    <button type="submit" class="btn btn-outline-secondary">
                                        <i class="bi bi-download me-2"></i>Converter e Baixar Diretamente
                                    </button>
                                </div>
                            </form>
                        </div>

                        <!-- JPG to HEIC Tab -->
                        <div class="tab-pane fade" id="jpg-to-heic" role="tabpanel" aria-labelledby="jpg-to-heic-tab">
                            <form id="jpgToHeicForm" asp-action="ConvertJpgToHeic" method="post" enctype="multipart/form-data" class="needs-validation">
                                <div asp-validation-summary="ModelOnly" class="alert alert-danger" role="alert"></div>

                                <div class="mb-4">
                                    <label for="jpgFile" class="form-label fw-semibold">@ViewBag.JpgFileInputLabel</label>
                                    <input class="form-control" type="file" id="jpgFile" name="jpgFile" accept=".jpg,.jpeg,.JPG,.JPEG" required>
                                    <div class="form-text">
                                        <i class="bi bi-info-circle me-1"></i>Formatos aceitos: .jpg, .jpeg (máx. 10MB para preview)
                                    </div>
                                    <div class="invalid-feedback">
                                        Por favor, selecione um arquivo JPG válido.
                                    </div>
                                </div>

                                <div class="d-grid gap-2">
                                    <button type="button" id="convertJpgPreviewBtn" class="btn btn-primary">
                                        <i class="bi bi-eye me-2"></i>Converter e Visualizar
                                    </button>
                                    <button type="submit" class="btn btn-outline-secondary">
                                        <i class="bi bi-download me-2"></i>Converter e Baixar Diretamente
                                    </button>
                                </div>
                            </form>
                        </div>
                    </div>

                    <!-- Loading Spinner -->
                    <div id="loadingSpinner" class="text-center mt-4" style="display: none;">
                        <div class="spinner-border text-primary" role="status">
                            <span class="visually-hidden">Convertendo...</span>
                        </div>
                        <p class="mt-2 text-muted">Convertendo sua imagem...</p>
                    </div>

                    <!-- Preview Area -->
                    <div id="previewArea" class="mt-4" style="display: none;">
                        <div class="card">
                            <div class="card-header d-flex justify-content-between align-items-center">
                                <h6 class="mb-0">
                                    <i class="bi bi-image me-2"></i>Imagem Convertida
                                </h6>
                                <button id="downloadBtn" class="btn btn-success btn-sm">
                                    <i class="bi bi-download me-1"></i>Baixar JPG
                                </button>
                            </div>
                            <div class="card-body text-center">
                                <img id="previewImage" src="" alt="Imagem convertida" class="img-fluid rounded" style="max-height: 400px; max-width: 100%;">
                                <div class="mt-2">
                                    <small id="imageInfo" class="text-muted"></small>
                                </div>
                            </div>
                        </div>
                    </div>

                    <!-- Error Area -->
                    <div id="errorArea" class="mt-4" style="display: none;">
                        <div class="alert alert-warning" role="alert">
                            <i class="bi bi-exclamation-triangle me-2"></i>
                            <span id="errorMessage"></span>
                            <button id="fallbackDownloadBtn" class="btn btn-outline-primary btn-sm ms-2">
                                Tentar Download Direto
                            </button>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>

    <!-- FAQ Accordion -->
    <div class="row mt-5">
        <div class="col-lg-10 mx-auto">
            <div class="converter-faq">
                <h3 class="h4 mb-3 text-center">Perguntas Frequentes</h3>
                <div class="accordion" id="heicConverterFaqAccordion">
                    <div class="accordion-item">
                        <h2 class="accordion-header" id="headingWhat">
                            <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseWhat" aria-expanded="false" aria-controls="collapseWhat">
                                <i class="bi bi-question-circle me-2"></i>@ViewBag.FaqWhatTitle
                            </button>
                        </h2>
                        <div id="collapseWhat" class="accordion-collapse collapse" aria-labelledby="headingWhat" data-bs-parent="#heicConverterFaqAccordion">
                            <div class="accordion-body">
                                @ViewBag.FaqWhatContent
                            </div>
                        </div>
                    </div>

                    <div class="accordion-item">
                        <h2 class="accordion-header" id="headingHow">
                            <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseHow" aria-expanded="false" aria-controls="collapseHow">
                                <i class="bi bi-gear me-2"></i>@ViewBag.FaqHowTitle
                            </button>
                        </h2>
                        <div id="collapseHow" class="accordion-collapse collapse" aria-labelledby="headingHow" data-bs-parent="#heicConverterFaqAccordion">
                            <div class="accordion-body">
                                @ViewBag.FaqHowContent
                            </div>
                        </div>
                    </div>

                    <div class="accordion-item">
                        <h2 class="accordion-header" id="headingWhy">
                            <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseWhy" aria-expanded="false" aria-controls="collapseWhy">
                                <i class="bi bi-lightbulb me-2"></i>@ViewBag.FaqWhyTitle
                            </button>
                        </h2>
                        <div id="collapseWhy" class="accordion-collapse collapse" aria-labelledby="headingWhy" data-bs-parent="#heicConverterFaqAccordion">
                            <div class="accordion-body">
                                @ViewBag.FaqWhyContent
                            </div>
                        </div>
                    </div>

                    <div class="accordion-item">
                        <h2 class="accordion-header" id="headingSecurity">
                            <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseSecurity" aria-expanded="false" aria-controls="collapseSecurity">
                                <i class="bi bi-shield-check me-2"></i>@ViewBag.FaqSecurityTitle
                            </button>
                        </h2>
                        <div id="collapseSecurity" class="accordion-collapse collapse" aria-labelledby="headingSecurity" data-bs-parent="#heicConverterFaqAccordion">
                            <div class="accordion-body">
                                @ViewBag.FaqSecurityContent
                            </div>
                        </div>
                    </div>

                    <div class="accordion-item">
                        <h2 class="accordion-header" id="headingLimits">
                            <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseLimits" aria-expanded="false" aria-controls="collapseLimits">
                                <i class="bi bi-exclamation-triangle me-2"></i>@ViewBag.FaqLimitsTitle
                            </button>
                        </h2>
                        <div id="collapseLimits" class="accordion-collapse collapse" aria-labelledby="headingLimits" data-bs-parent="#heicConverterFaqAccordion">
                            <div class="accordion-body">
                                @ViewBag.FaqLimitsContent
                            </div>
                        </div>
                    </div>
                </div>
            </div>
        </div>
    </div>
</div>

<style>
    .nav-tabs .nav-link.disabled {
        background-color: #f8f9fa;
        border-color: #dee2e6;
        color: #6c757d;
        cursor: not-allowed;
    }

    .nav-tabs .nav-link.disabled:hover {
        background-color: #f8f9fa;
        border-color: #dee2e6;
        color: #6c757d;
    }

    #previewImage {
        box-shadow: 0 4px 8px rgba(0,0,0,0.1);
        border-radius: 8px;
    }

    .spinner-border {
        width: 3rem;
        height: 3rem;
    }

    @@media (max-width: 576px) {
        #previewImage {
            max-height: 250px;
        }

        .card-header .btn {
            font-size: 0.875rem;
        }
    }
</style>

<script>
document.addEventListener('DOMContentLoaded', function() {
    const convertPreviewBtn = document.getElementById('convertPreviewBtn');
    const convertJpgPreviewBtn = document.getElementById('convertJpgPreviewBtn');
    const downloadBtn = document.getElementById('downloadBtn');
    const fallbackDownloadBtn = document.getElementById('fallbackDownloadBtn');
    const heicForm = document.getElementById('heicToJpgForm');
    const jpgForm = document.getElementById('jpgToHeicForm');
    const heicFileInput = document.getElementById('heicFile');
    const jpgFileInput = document.getElementById('jpgFile');
    const loadingSpinner = document.getElementById('loadingSpinner');
    const previewArea = document.getElementById('previewArea');
    const errorArea = document.getElementById('errorArea');
    const previewImage = document.getElementById('previewImage');
    const imageInfo = document.getElementById('imageInfo');
    const errorMessage = document.getElementById('errorMessage');

    let convertedImageData = null;
    let convertedFileName = null;

    // Bootstrap form validation
    const forms = document.querySelectorAll('.needs-validation');
    Array.from(forms).forEach(function(form) {
        form.addEventListener('submit', function(event) {
            if (!form.checkValidity()) {
                event.preventDefault();
                event.stopPropagation();
            }
            form.classList.add('was-validated');
        });
    });

    // File input validation
    heicFileInput.addEventListener('change', function() {
        hideAllAreas();

        if (this.files.length > 0) {
            const file = this.files[0];
            const maxSize = 10 * 1024 * 1024; // 10MB

            if (file.size > maxSize) {
                showError('Arquivo muito grande para preview (máx. 10MB). Use "Converter e Baixar Diretamente".');
                convertPreviewBtn.disabled = true;
            } else {
                convertPreviewBtn.disabled = false;
            }
        }
    });

    jpgFileInput.addEventListener('change', function() {
        hideAllAreas();

        if (this.files.length > 0) {
            const file = this.files[0];
            const maxSize = 10 * 1024 * 1024; // 10MB

            if (file.size > maxSize) {
                showError('Arquivo muito grande para preview (máx. 10MB). Use "Converter e Baixar Diretamente".');
                convertJpgPreviewBtn.disabled = true;
            } else {
                convertJpgPreviewBtn.disabled = false;
            }
        }
    });

    // Convert and Preview button
    convertPreviewBtn.addEventListener('click', async function() {
        if (!heicFileInput.files[0]) {
            showError('Por favor, selecione um arquivo HEIC primeiro.');
            return;
        }

        await convertToPreview(heicForm);
    });

    // Convert JPG to HEIC Preview button
    convertJpgPreviewBtn.addEventListener('click', async function() {
        if (!jpgFileInput.files[0]) {
            showError('Por favor, selecione um arquivo JPG primeiro.');
            return;
        }

        await convertToPreview(jpgForm);
    });

    // Download button (after preview)
    downloadBtn.addEventListener('click', function() {
        if (convertedImageData && convertedFileName) {
            downloadBase64Image(convertedImageData, convertedFileName);
        }
    });

    // Fallback download button
    fallbackDownloadBtn.addEventListener('click', function() {
        const activeTab = document.querySelector('.nav-link.active');
        const currentForm = activeTab.id === 'heic-to-jpg-tab' ? heicForm : jpgForm;
        submitFormForDownload(currentForm);
    });

    async function convertToPreview(form) {
        showLoading();

        try {
            const formData = new FormData(form);

            const response = await fetch(form.action + '?preview=true', {
                method: 'POST',
                body: formData
            });

            if (response.ok) {
                const contentType = response.headers.get('content-type');

                if (contentType && contentType.includes('application/json')) {
                    // JSON response with base64
                    const result = await response.json();

                    if (result.success) {
                        showPreview(result.base64, result.filename, result.originalSize, result.convertedSize);
                    } else {
                        showError(result.message || 'Erro na conversão. Tentando download direto...');
                        setTimeout(() => submitFormForDownload(form), 2000);
                    }
                } else {
                    // Binary response - fallback to download
                    showError('Arquivo muito grande para preview. Iniciando download direto...');
                    setTimeout(() => submitFormForDownload(form), 1000);
                }
            } else {
                const errorText = await response.text();
                showError('Erro na conversão: ' + (errorText || response.statusText));
            }
        } catch (error) {
            console.error('Conversion error:', error);
            showError('Erro de conexão. Tentando download direto...');
            setTimeout(() => submitFormForDownload(form), 2000);
        }
    }

    function showPreview(base64Data, filename, originalSize, convertedSize) {
        hideAllAreas();

        previewImage.src = base64Data;
        convertedImageData = base64Data;
        convertedFileName = filename;

        const originalSizeMB = (originalSize / (1024 * 1024)).toFixed(2);
        const convertedSizeMB = (convertedSize / (1024 * 1024)).toFixed(2);
        const reduction = (((originalSize - convertedSize) / originalSize) * 100).toFixed(1);

        imageInfo.textContent = `Original: ${originalSizeMB}MB → Convertido: ${convertedSizeMB}MB (${reduction}% menor)`;

        previewArea.style.display = 'block';
    }

    function showLoading() {
        hideAllAreas();
        loadingSpinner.style.display = 'block';
    }

    function showError(message) {
        hideAllAreas();
        errorMessage.textContent = message;
        errorArea.style.display = 'block';
    }

    function hideAllAreas() {
        loadingSpinner.style.display = 'none';
        previewArea.style.display = 'none';
        errorArea.style.display = 'none';
    }

    function submitFormForDownload(form) {
        // Submit form normally for direct download
        if (form) {
            form.submit();
        }
    }

    function downloadBase64Image(base64Data, filename) {
        // Convert base64 to blob and download
        const base64Response = fetch(base64Data);
        base64Response.then(res => res.blob()).then(blob => {
            const url = window.URL.createObjectURL(blob);
            const a = document.createElement('a');
            a.href = url;
            a.download = filename;
            document.body.appendChild(a);
            a.click();
            document.body.removeChild(a);
            window.URL.revokeObjectURL(url);
        });
    }
});
</script>