import TelegramBot from 'node-telegram-bot-api';
import { Database } from './database';

interface TelegramUser {
    id: number;
    first_name: string;
    last_name?: string;
    username?: string;
}

interface Message {
    chat: {
        id: number;
    };
    from?: TelegramUser;
    web_app?: {
        data: string;
    };
}

interface InlineQuery {
    id: string;
    query: string;
}

interface WebAppData {
    action: string;
    audioUrl: string;
    title: string;
}

interface SearchResult {
    query: string;
    created_at: string;
}

export class QuixoticBot {
    private bot: TelegramBot;
    private webAppUrl: string;
    private db: Database;

    constructor(token: string, webAppUrl: string) {
        this.bot = new TelegramBot(token, { polling: true });
        this.webAppUrl = webAppUrl;
        this.db = new Database();
        this.init();
    }

    private init(): void {
        console.log('🤖 Telegram bot initialized');
        this.setupCommands();
        this.setupHandlers();
    }

    private setupCommands(): void {
        // Set bot commands
        this.bot.setMyCommands([
            { command: 'start', description: 'Запустить приложение' },
            { command: 'help', description: 'Помощь' },
            { command: 'history', description: 'История поиска' }
        ]);
    }

    private setupHandlers(): void {
        console.log('🔧 Setting up bot handlers...');
        
        // Handle messages
        this.bot.on('message', (msg: any) => {
            
            // Handle web app data in regular message event
            if (msg.web_app?.data) {
                this.handleWebAppData(msg);
                return; // Important: don't process as regular message
            }
        });
        
        // Start command
        this.bot.onText(/\/start/, async (msg: Message) => {
            const chatId = msg.chat.id;
            const user = msg.from;

            try {
                // Add user to database
                if (user) {
                    await this.db.addUser(user);
                }
                
                const keyboard = {
                    inline_keyboard: [[
                        {
                            text: '🎵 Открыть Quixotic',
                            web_app: { url: this.webAppUrl }
                        }
                    ]]
                };

                await this.bot.sendMessage(chatId, 
                    '🎵 Добро пожаловать в Quixotic!\n\n' +
                    'Найди любую песню на SoundCloud и получи MP3 файл прямо в чат.\n\n' +
                    'Нажми кнопку ниже, чтобы начать поиск:',
                    { reply_markup: keyboard }
                );
            } catch (error) {
                console.error('Start command error:', error);
                await this.bot.sendMessage(chatId, '❌ Произошла ошибка. Попробуйте позже.');
            }
        });

        // Help command
        this.bot.onText(/\/help/, async (msg: Message) => {
            const chatId = msg.chat.id;
            
            const helpText = `🎵 *Quixotic - SoundCloud to MP3*

*Как пользоваться:*
1️⃣ Нажми кнопку "Открыть Quixotic"
2️⃣ Введи название песни в поисковую строку
3️⃣ Выбери нужный трек из списка
4️⃣ Получи MP3 файл в чат!

*Команды:*
/start - Запустить приложение
/help - Эта справка
/history - История поиска

*Возможности:*
✅ Поиск по SoundCloud
✅ Высокое качество MP3 (192kbps)
✅ Быстрая конвертация
✅ История поиска`;

            await this.bot.sendMessage(chatId, helpText, { parse_mode: 'Markdown' });
        });

        // History command
        this.bot.onText(/\/history/, async (msg: Message) => {
            const chatId = msg.chat.id;
            const userId = msg.from?.id;

            if (!userId) return;

            try {
                const user = await this.db.getUserByTelegramId(userId);
                if (!user) {
                    await this.bot.sendMessage(chatId, 'История поиска пуста.');
                    return;
                }

                // Get recent search history
                const history = await this.getSearchHistory(user.id);

                if (history.length === 0) {
                    await this.bot.sendMessage(chatId, 'История поиска пуста.');
                    return;
                }

                let historyText = '📋 *Последние поисковые запросы:*\n\n';
                history.forEach((item, index) => {
                    const date = new Date(item.created_at).toLocaleDateString('ru-RU');
                    historyText += `${index + 1}. ${item.query} _(${date})_\n`;
                });

                await this.bot.sendMessage(chatId, historyText, { parse_mode: 'Markdown' });
            } catch (error) {
                console.error('History command error:', error);
                await this.bot.sendMessage(chatId, '❌ Ошибка получения истории.');
            }
        });

        // Handle web app data - primary event handler
        this.bot.on('web_app_data', async (msg: Message) => {
            this.handleWebAppData(msg);
        });

        // Handle callback queries
        this.bot.on('callback_query', async (query: any) => {
            if (query.data) {
                try {
                    const data = JSON.parse(query.data);
                    if (data.action === 'send_audio') {
                        await this.sendAudioFileInternal(query.message.chat.id, data.audioUrl, data.title);
                    }
                } catch {
                    // Not JSON, ignore
                }
            }
            await this.bot.answerCallbackQuery(query.id);
        });

        // Handle inline queries for search
        this.bot.on('inline_query', async (query: InlineQuery) => {
            const queryId = query.id;
            const searchQuery = query.query;

            if (!searchQuery || searchQuery.length < 3) {
                await this.bot.answerInlineQuery(queryId, []);
                return;
            }

            try {
                const { SoundCloudService } = require('./soundcloud');
                const soundcloud = new SoundCloudService();
                const videos = await soundcloud.searchTracks(searchQuery, 5);

                const results = videos.map((video: any, index: number) => ({
                    type: 'article',
                    id: `${index}`,
                    title: video.title,
                    description: `${video.channel} • ${this.formatDuration(video.duration)}`,
                    thumb_url: video.thumbnail,
                    input_message_content: {
                        message_text: `🎵 ${video.title}\n🔗 ${video.url}`
                    }
                }));

                await this.bot.answerInlineQuery(queryId, results, {
                    cache_time: 300,
                    is_personal: true
                });
            } catch (error) {
                console.error('Inline query error:', error);
                await this.bot.answerInlineQuery(queryId, []);
            }
        });

        // Error handler with detailed logging
        this.bot.on('error', (error: any) => {
            console.error('🚨 Telegram bot error:', error.message || error);
            console.error('Error code:', error.code);
            console.error('Full error:', error);
        });

        // Handle polling errors specifically
        this.bot.on('polling_error', (error: any) => {
            console.error('🚨 Telegram polling error:', error.message || error);
            console.error('Error code:', error.code);
            
            // Don't crash on polling errors, just log them
            if (error.code === 'ETELEGRAM') {
                console.warn('⚠️ Telegram API error - continuing operation');
            }
        });


        console.log('✅ Bot handlers setup complete');
    }

    private async getSearchHistory(userId: number): Promise<SearchResult[]> {
        return this.db.getSearchHistory(userId);
    }

    // Public method for external API calls
    public async sendAudioFile(chatId: number, audioUrl: string, title: string): Promise<void> {
        return this.sendAudioFileInternal(chatId, audioUrl, title);
    }

    private async sendAudioFileInternal(chatId: number, audioUrl: string, title: string): Promise<void> {
        try {
            console.log(`📤 Sending: ${title} to chat ${chatId}`);
            
            // Try sending as audio
            try {
                await this.bot.sendAudio(chatId, audioUrl, {
                    title: title,
                    performer: 'SoundCloud',
                    caption: `🎵 ${title}`,
                    parse_mode: undefined
                });
                console.log(`✅ Audio sent: ${title}`);
                return;
                
            } catch {
                // Fallback: try as document
                try {
                    await this.bot.sendDocument(chatId, audioUrl, {
                        caption: `🎵 ${title}`,
                        parse_mode: undefined
                    });
                    console.log(`✅ Document sent: ${title}`);
                    return;
                    
                } catch (documentError: any) {
                    throw documentError;
                }
            }

        } catch (error: any) {
            console.error('❌ Send failed:', error.message);
            
            // Send fallback with link
            try {
                await this.bot.sendMessage(chatId, 
                    `❌ Не удалось отправить файл.\n🎵 ${title}\n🔗 ${audioUrl}`
                );
            } catch {
                // Silent fail
            }
        }
    }

    private async handleWebAppData(msg: Message): Promise<void> {
        const chatId = msg.chat.id;
        
        if (!msg.web_app?.data) {
            return;
        }
        
        try {
            const data: WebAppData = JSON.parse(msg.web_app.data);

            if (data.action === 'send_audio') {
                console.log(`🎵 WebApp request: ${data.title}`);
                await this.sendAudioFileInternal(chatId, data.audioUrl, data.title);
            }
        } catch (parseError: any) {
            console.error('❌ WebApp data parse error:', parseError.message);
        }
    }


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

// Initialize bot if this file is run directly
if (require.main === module) {
    const token = process.env.TELEGRAM_BOT_TOKEN;
    const webAppUrl = process.env.WEB_APP_URL || 'https://your-domain.com';
    
    if (!token) {
        console.error('❌ TELEGRAM_BOT_TOKEN environment variable is required');
        process.exit(1);
    }

    new QuixoticBot(token, webAppUrl);
}