let currentDownloadId = null;
let progressInterval = null;

document.addEventListener('DOMContentLoaded', function() {
    loadDownloads();

    document.getElementById('downloadForm').addEventListener('submit', function(e) {
        e.preventDefault();
        startDownload();
    });
});

function startDownload() {
    const url = document.getElementById('url').value.trim();
    const format = document.querySelector('input[name="format"]:checked').value;

    if (!url) {
        showError('Por favor, ingresa una URL válida de YouTube');
        return;
    }

    // Show progress section
    document.getElementById('progressSection').style.display = 'block';
    document.getElementById('downloadBtn').disabled = true;
    document.getElementById('downloadBtn').innerHTML = '<i class="fas fa-spinner fa-spin"></i> Descargando...';

    // Reset progress
    updateProgress({
        status: 'starting',
        progress: 0,
        speed: '',
        eta: '',
        filename: ''
    });

    // Start download
    fetch('/api/downloads', {
        method: 'POST',
        headers: {
            'Content-Type': 'application/json',
        },
        body: JSON.stringify({
            url: url,
            format: format
        })
    })
    .then(response => response.json())
    .then(data => {
        if (data.error) {
            showError(data.error);
            resetForm();
        } else {
            currentDownloadId = data.download_id;
            checkProgress();
        }
    })
    .catch(error => {
        console.error('Error:', error);
        showError('Error al iniciar la descarga');
        resetForm();
    });
}

function checkProgress() {
    if (!currentDownloadId) return;

    let retryCount = 0;
    const maxRetries = 3;

    progressInterval = setInterval(() => {
        fetch(`/api/status/${currentDownloadId}`)
            .then(response => {
                if (!response.ok) {
                    throw new Error(`HTTP ${response.status}: ${response.statusText}`);
                }
                return response.json();
            })
            .then(data => {
                if (data.error) {
                    showError(data.error);
                    resetForm();
                    return;
                }

                retryCount = 0; // Reset retry count on successful response
                updateProgress(data);

                if (data.complete) {
                    clearInterval(progressInterval);
                    showSuccess();
                    resetForm();
                    loadDownloads();
                } else if (data.status === 'error') {
                    clearInterval(progressInterval);
                    showError(data.error || 'Error en la descarga');
                    resetForm();
                }
            })
            .catch(error => {
                console.error('Error checking progress:', error);
                retryCount++;

                if (retryCount >= maxRetries) {
                    clearInterval(progressInterval);
                    showError('Error de conexión. Verifica tu internet e intenta nuevamente.');
                    resetForm();
                }
            });
    }, 2000); // Check every 2 seconds instead of 1
}

function updateProgress(data) {
    const progressBar = document.getElementById('progressBar');
    const speed = document.getElementById('speed');
    const eta = document.getElementById('eta');
    const filename = document.getElementById('filename');
    const errorMessage = document.getElementById('errorMessage');

    progressBar.style.width = data.progress + '%';
    progressBar.textContent = data.progress + '%';

    speed.textContent = data.speed || '-';
    eta.textContent = data.eta || '-';

    if (data.filename) {
        const name = data.filename.split('/').pop();
        filename.textContent = name;
        filename.title = name;
    }

    if (data.error) {
        errorMessage.textContent = data.error;
        errorMessage.style.display = 'block';
    } else {
        errorMessage.style.display = 'none';
    }
}

function showError(message) {
    const errorMessage = document.getElementById('errorMessage');
    errorMessage.textContent = message;
    errorMessage.style.display = 'block';
}

function showSuccess() {
    const progressSection = document.getElementById('progressSection');
    progressSection.querySelector('.card-header h5').innerHTML =
        '<i class="fas fa-check-circle text-success"></i> ¡Descarga Completada!';
}

function resetForm() {
    document.getElementById('downloadBtn').disabled = false;
    document.getElementById('downloadBtn').innerHTML = '<i class="fas fa-download"></i> Descargar';

    setTimeout(() => {
        document.getElementById('progressSection').style.display = 'none';
        document.getElementById('url').value = '';
        currentDownloadId = null;
    }, 3000);
}

// Limpiar interval al perder focus de la ventana
document.addEventListener('visibilitychange', function() {
    if (document.hidden && progressInterval) {
        clearInterval(progressInterval);
        progressInterval = null;
    }
});

function loadDownloads() {
    fetch('/api/downloads')
        .then(response => response.json())
        .then(downloads => {
            const downloadsList = document.getElementById('downloadsList');

            let headerHtml = '';
            if (downloads.length > 0) {
                headerHtml = `
                    <div class="d-flex justify-content-between align-items-center mb-3">
                        <h6 class="mb-0">${downloads.length} archivo(s)</h6>
                        <button class="btn btn-outline-secondary btn-sm" onclick="cleanupDownloads()">
                            <i class="fas fa-broom"></i> Limpiar
                        </button>
                    </div>
                `;
            }

            if (downloads.length === 0) {
                downloadsList.innerHTML = `
                    ${headerHtml}
                    <div class="text-center text-muted">
                        <i class="fas fa-inbox fa-3x mb-3"></i>
                        <p>No hay descargas aún</p>
                    </div>
                `;
                return;
            }

            downloadsList.innerHTML = `
                ${headerHtml}
                ${downloads.map(download => `
                    <div class="download-item">
                        <div class="row align-items-center">
                            <div class="col-md-8">
                                <h6 class="mb-1">
                                    <i class="fas fa-file-${getFileIcon(download.filename)}"></i>
                                    ${download.filename}
                                </h6>
                                <small class="text-muted">
                                    ${formatFileSize(download.size)} • ${download.modified}
                                </small>
                            </div>
                            <div class="col-md-4 text-end">
                                <a href="${download.url}" class="btn btn-primary btn-sm">
                                    <i class="fas fa-download"></i> Descargar
                                </a>
                            </div>
                        </div>
                    </div>
                `).join('')}
            `;
        })
        .catch(error => {
            console.error('Error loading downloads:', error);
        });
}

function getFileIcon(filename) {
    if (filename.endsWith('.mp3')) return 'audio';
    if (filename.endsWith('.mp4')) return 'video';
    if (filename.endsWith('.webm')) return 'video';
    if (filename.endsWith('.m4a')) return 'audio';
    return 'alt';
}

function cleanupDownloads() {
    if (confirm('¿Eliminar archivos temporales y descargas antiguas?')) {
        fetch('/api/cleanup', {
            method: 'POST',
            headers: {
                'Content-Type': 'application/json',
            }
        })
        .then(response => response.json())
        .then(data => {
            if (data.error) {
                alert('Error: ' + data.error);
            } else {
                alert(`Se eliminaron ${data.cleaned_files} archivos y ${data.cleaned_downloads} estados de descarga.`);
                loadDownloads();
            }
        })
        .catch(error => {
            console.error('Error cleaning up:', error);
            alert('Error al limpiar archivos');
        });
    }
}

function formatFileSize(bytes) {
    if (bytes === 0) return '0 Bytes';
    const k = 1024;
    const sizes = ['Bytes', 'KB', 'MB', 'GB'];
    const i = Math.floor(Math.log(bytes) / Math.log(k));
    return parseFloat((bytes / Math.pow(k, i)).toFixed(2)) + ' ' + sizes[i];
}

// Auto-refresh downloads list every 30 seconds
setInterval(loadDownloads, 30000);