class QuixoticApp {
    constructor() {
        this.tg = window.Telegram?.WebApp;
        this.init();
        this.bindEvents();
    }

    init() {
        if (this.tg) {
            this.tg.ready();
            this.tg.expand();
            this.tg.MainButton.hide();
        }

        this.searchInput = document.getElementById('searchInput');
        this.searchBtn = document.getElementById('searchBtn');
        this.loading = document.getElementById('loading');
        this.results = document.getElementById('results');
        this.noResults = document.getElementById('noResults');
    }

    bindEvents() {
        this.searchBtn.addEventListener('click', () => this.search());
        this.searchInput.addEventListener('keypress', (e) => {
            if (e.key === 'Enter') {
                this.search();
            }
        });
    }

    async search() {
        const query = this.searchInput.value.trim();
        if (!query) return;

        this.showLoading();
        
        try {
            const response = await fetch('/api/search', {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                },
                body: JSON.stringify({ 
                    query,
                    userId: this.tg?.initDataUnsafe?.user?.id || 'demo'
                })
            });

            if (!response.ok) {
                throw new Error('Search failed');
            }

            const data = await response.json();
            this.displayResults(data.videos);
        } catch (error) {
            console.error('Search error:', error);
            this.showNoResults();
        }
    }

    showLoading() {
        this.loading.classList.remove('hidden');
        this.results.classList.add('hidden');
        this.noResults.classList.add('hidden');
        this.searchBtn.disabled = true;
    }

    hideLoading() {
        this.loading.classList.add('hidden');
        this.searchBtn.disabled = false;
    }

    displayResults(videos) {
        this.hideLoading();
        
        if (!videos || videos.length === 0) {
            this.showNoResults();
            return;
        }

        this.results.innerHTML = videos.map(video => `
            <div class="video-item" onclick="app.convertVideo('${video.id}', '${this.escapeHtml(video.title)}')">
                <img class="video-thumbnail" src="${video.thumbnail}" alt="${this.escapeHtml(video.title)}" loading="lazy">
                <div class="video-info">
                    <div class="video-title">${this.escapeHtml(video.title)}</div>
                    <div class="video-channel">${this.escapeHtml(video.channel)}</div>
                    <div class="video-duration">${this.formatDuration(video.duration)}</div>
                </div>
            </div>
        `).join('');

        this.results.classList.remove('hidden');
        this.noResults.classList.add('hidden');
    }

    showNoResults() {
        this.hideLoading();
        this.results.classList.add('hidden');
        this.noResults.classList.remove('hidden');
    }

    async convertVideo(videoId, title) {
        console.log('Convert video called:', { videoId, title });
        const videoElement = event.currentTarget;
        videoElement.classList.add('converting');

        try {
            console.log('Sending convert request...');
            const response = await fetch('/api/convert', {
                method: 'POST',
                headers: {
                    'Content-Type': 'application/json',
                },
                body: JSON.stringify({
                    videoId,
                    title,
                    userId: this.tg?.initDataUnsafe?.user?.id || 'demo'
                })
            });

            console.log('Response status:', response.status);
            if (!response.ok) {
                throw new Error(`Conversion failed with status: ${response.status}`);
            }

            const data = await response.json();
            console.log('Response data:', data);
            
            if (data.audioUrl) {
                // MP3 conversion successful!
                console.log('MP3 conversion successful:', data.audioUrl);
                
                if (this.tg) {
                    // Send to Telegram chat
                    this.tg.sendData(JSON.stringify({
                        action: 'send_audio',
                        audioUrl: data.audioUrl,
                        title: title
                    }));
                    this.showMessage('✓ MP3 готов! Отправляем в чат...', 'success');
                } else {
                    // For testing in browser - download file
                    const link = document.createElement('a');
                    link.href = data.audioUrl;
                    link.download = `${title}.mp3`;
                    document.body.appendChild(link);
                    link.click();
                    document.body.removeChild(link);
                    this.showMessage('✓ MP3 скачан!', 'success');
                }
            } else {
                // Should not happen since we removed fallbacks
                throw new Error('No audio URL received');
            }
        } catch (error) {
            console.error('Conversion error:', error);
            
            // Show specific error message
            let errorMsg = 'Ошибка конвертации. Попробуйте другое видео.';
            
            if (error.message.includes('No audio URL')) {
                errorMsg = 'Не удалось получить аудио файл.';
            } else if (error.message.includes('410')) {
                errorMsg = 'Видео недоступно для скачивания.';
            } else if (error.message.includes('403')) {
                errorMsg = 'Видео заблокировано для скачивания.';
            }
            
            this.showMessage(`❌ ${errorMsg}`, 'warning');
        } finally {
            videoElement.classList.remove('converting');
        }
    }

    formatDuration(seconds) {
        if (!seconds) return '';
        const mins = Math.floor(seconds / 60);
        const secs = seconds % 60;
        return `${mins}:${secs.toString().padStart(2, '0')}`;
    }

    showMessage(message, type = 'info') {
        // Remove existing message if any
        const existingMessage = document.querySelector('.status-message');
        if (existingMessage) {
            existingMessage.remove();
        }

        // Create message element
        const messageEl = document.createElement('div');
        messageEl.className = `status-message status-${type}`;
        messageEl.textContent = message;
        
        // Add to page
        const container = document.querySelector('.container');
        container.insertBefore(messageEl, container.firstChild);
        
        // Auto-remove after 5 seconds
        setTimeout(() => {
            if (messageEl.parentNode) {
                messageEl.remove();
            }
        }, 5000);
    }

    escapeHtml(text) {
        const div = document.createElement('div');
        div.textContent = text;
        return div.innerHTML;
    }
}

const app = new QuixoticApp();