@{
    ViewData["Title"] = "Texto para Áudio (Voz)";
}

<div class="text-center mb-5">
    <h1 class="display-4">@ViewData["Title"]</h1>
    <p class="lead">Converta qualquer texto em fala usando vozes neurais de alta qualidade.</p>
</div>

<div class="row justify-content-center">
    <div class="col-md-8">
        <div class="card shadow-custom p-4">
            <div class="mb-4">
                <label for="textInput" class="form-label h5">Digite ou cole seu texto</label>
                <textarea class="form-control" id="textInput" rows="6" placeholder="Escreva aqui o que você deseja que seja lido..."></textarea>
            </div>

            <div class="row mb-4">
                <div class="col-md-6">
                    <label for="voiceSelect" class="form-label">Escolher Voz</label>
                    <select id="voiceSelect" class="form-select"></select>
                </div>
                <div class="col-md-3">
                    <label for="rate" class="form-label">Velocidade</label>
                    <input type="range" class="form-range" min="0.5" max="2" step="0.1" id="rate" value="1">
                </div>
                <div class="col-md-3">
                    <label for="pitch" class="form-label">Tom</label>
                    <input type="range" class="form-range" min="0" max="2" step="0.1" id="pitch" value="1">
                </div>
            </div>

            <div class="d-grid gap-2 d-md-flex justify-content-md-center">
                <button type="button" class="btn btn-primary btn-lg px-5" onclick="speak()">
                    <i class="bi bi-play-fill me-2"></i>Ouvir
                </button>
                <button type="button" class="btn btn-outline-danger btn-lg" onclick="stop()">
                    <i class="bi bi-stop-fill me-2"></i>Parar
                </button>
            </div>
        </div>

        <div class="mt-4 alert alert-info">
            <i class="bi bi-info-circle me-2"></i> 
            Esta ferramenta usa as vozes instaladas no seu dispositivo. No Android e Windows, você encontrará opções de vozes neurais muito naturais.
        </div>
    </div>
</div>

@section Scripts {
    <script>
        const synth = window.speechSynthesis;
        const voiceSelect = document.querySelector('#voiceSelect');
        const textInput = document.querySelector('#textInput');
        const rate = document.querySelector('#rate');
        const pitch = document.querySelector('#pitch');

        let voices = [];

        function populateVoiceList() {
            voices = synth.getVoices().sort(function (a, b) {
                const aname = a.name.toUpperCase();
                const bname = b.name.toUpperCase();
                if (aname < bname) return -1;
                else if (aname > bname) return 1;
                else return 0;
            });

            const selectedIndex = voiceSelect.selectedIndex < 0 ? 0 : voiceSelect.selectedIndex;
            voiceSelect.innerHTML = '';

            for (let i = 0; i < voices.length; i++) {
                const option = document.createElement('option');
                option.textContent = voices[i].name + ' (' + voices[i].lang + ')';

                if (voices[i].default) {
                    option.textContent += ' -- PADRÃO';
                }

                option.setAttribute('data-lang', voices[i].lang);
                option.setAttribute('data-name', voices[i].name);
                voiceSelect.appendChild(option);
            }
            voiceSelect.selectedIndex = selectedIndex;
        }

        populateVoiceList();
        if (speechSynthesis.onvoiceschanged !== undefined) {
            speechSynthesis.onvoiceschanged = populateVoiceList;
        }

        function speak() {
            if (synth.speaking) {
                console.error('speechSynthesis.speaking');
                return;
            }
            if (textInput.value !== '') {
                const utterThis = new SpeechSynthesisUtterance(textInput.value);
                utterThis.onend = function (event) {
                    console.log('SpeechSynthesisUtterance.onend');
                }
                utterThis.onerror = function (event) {
                    console.error('SpeechSynthesisUtterance.onerror');
                }
                const selectedOption = voiceSelect.selectedOptions[0].getAttribute('data-name');
                for (let i = 0; i < voices.length; i++) {
                    if (voices[i].name === selectedOption) {
                        utterThis.voice = voices[i];
                        break;
                    }
                }
                utterThis.pitch = pitch.value;
                utterThis.rate = rate.value;
                synth.speak(utterThis);
            }
        }

        function stop() {
            synth.cancel();
        }
    </script>
}