/**
 * ═══════════════════════════════════════════════════════════════════════
 * CLASSE: BotCore (HF SPACES EDITION - SMART LOAD)
 * ═══════════════════════════════════════════════════════════════════════
 * Núcleo do bot: Baileys wrapper, event handling e orquestração.
 * ═══════════════════════════════════════════════════════════════════════
 */

const {
  default: makeWASocket,
  useMultiFileAuthState,
  fetchLatestBaileysVersion,
  Browsers,
  delay,
  DisconnectReason
} = require('@whiskeysockets/baileys');
const pino = require('pino');
const path = require('path');
const fs = require('fs');

/**
 * Função de carregamento inteligente para evitar erros de "Module Not Found"
 * no ambiente do Hugging Face Spaces.
 */
function smartRequire(moduleName) {
  try {
    return require(`./${moduleName}`);
  } catch (e) {
    try {
      return require(`./modules/${moduleName}`);
    } catch (e2) {
      console.error(`❌ [BotCore] Erro ao carregar componente: ${moduleName}`);
      return null;
    }
  }
}

// Carregamento dos componentes e correções
const HFCorrections = smartRequire('HFCorrections');
const ConfigManager = smartRequire('ConfigManager');
const APIClient = smartRequire('APIClient');
const AudioProcessor = smartRequire('AudioProcessor');
const MediaProcessor = smartRequire('MediaProcessor');
const MessageProcessor = smartRequire('MessageProcessor');
const ModerationSystem = smartRequire('ModerationSystem');
const LevelSystem = smartRequire('LevelSystem');
const CommandHandler = smartRequire('CommandHandler');

class BotCore {
  constructor() {
    this.config = ConfigManager ? ConfigManager.getInstance() : {};
    this.logger = pino({ level: 'silent' });
    this.sock = null;
    this.state = null;
    this.saveCreds = null;
    this.currentQR = null;
    this.isConnected = false;
    this.reconnectAttempts = 0;
    this.maxReconnectAttempts = 15; // Aumentado para resiliência no HF

    // Inicialização de Componentes
    this.apiClient = APIClient ? new APIClient() : null;
    this.moderation = ModerationSystem ? new ModerationSystem() : null;
    this.levels = LevelSystem ? new LevelSystem() : null;
    this.audioProcessor = AudioProcessor ? new AudioProcessor() : null;
    this.mediaProcessor = MediaProcessor ? new MediaProcessor() : null;
    this.commandHandler = null; // Definido após o socket
  }

  /**
   * Prepara o ambiente de arquivos
   */
  async initialize() {
    console.log('📂 Preparando diretórios de sistema...');
    const folders = ['auth_info', 'temp', '/tmp/akira_data'];
    folders.forEach(f => {
      if (!fs.existsSync(f)) fs.mkdirSync(f, { recursive: true });
    });
    return true;
  }

  /**
   * Estabelece conexão com WhatsApp usando DNS Hard-Patch
   */
  async connect() {
    try {
      console.log('🔧 Configurando credenciais de autenticação...');
      const { state, saveCreds } = await useMultiFileAuthState(path.join(__dirname, 'auth_info'));
      this.state = state;
      this.saveCreds = saveCreds;

      const { version } = await fetchLatestBaileysVersion();
      console.log(`📡 Baileys Version: ${version.join('.')}`);

      // ═══════════════════════════════════════════════════════════════════════
      // SOCKET CONFIGURATION (HF SPACES OPTIMIZED)
      // ═══════════════════════════════════════════════════════════════════════
      this.sock = makeWASocket({
        version,
        logger: this.logger,
        printQRInTerminal: true,
        auth: this.state,
        browser: Browsers.ubuntu('Chrome'),
        
        // Aplica Agente e Patch de DNS do HFCorrections
        agent: HFCorrections ? HFCorrections.createHFAgent() : undefined,
        socketConfig: HFCorrections ? HFCorrections.createWebSocketOptions() : {},
        
        // Configurações de tempo de rede
        connectTimeoutMs: 60000,
        defaultQueryTimeoutMs: 0,
        keepAliveIntervalMs: 30000,
        
        // Prioriza IPv4 para evitar erros de rede do container
        getNextIp: (host) => {
           const ip = HFCorrections ? HFCorrections.getWhatsAppIP() : undefined;
           return ip;
        }
      });

      // Vincula o CommandHandler
      if (CommandHandler) {
        this.commandHandler = new CommandHandler(this, this.sock);
      }

      // --- EVENTOS DO WHATSAPP ---

      this.sock.ev.on('creds.update', this.saveCreds);

      this.sock.ev.on('connection.update', async (update) => {
        const { connection, lastDisconnect, qr } = update;

        if (qr) {
          this.currentQR = qr;
          console.log('✨ [QR CODE] Novo código disponível na Web UI.');
        }

        if (connection === 'close') {
          this.isConnected = false;
          const statusCode = (lastDisconnect?.error)?.output?.statusCode;
          const shouldReconnect = statusCode !== DisconnectReason.loggedOut;
          
          console.log(`⚠️ Conexão encerrada. Motivo: ${lastDisconnect?.error?.message || 'Desconhecido'}`);
          
          if (shouldReconnect && this.reconnectAttempts < this.maxReconnectAttempts) {
            this.reconnectAttempts++;
            const backoff = Math.min(this.reconnectAttempts * 5000, 45000);
            console.log(`🔄 Tentando reconexão em ${backoff/1000}s...`);
            setTimeout(() => this.connect(), backoff);
          } else if (statusCode === DisconnectReason.loggedOut) {
            console.error('❌ Sessão encerrada permanentemente. Apague a pasta auth_info.');
          }
        }

        if (connection === 'open') {
          this.isConnected = true;
          this.reconnectAttempts = 0;
          this.currentQR = null;
          console.log('🚀 AKIRA BOT CONECTADO COM SUCESSO!');
        }
      });

      // Listener de Mensagens
      this.sock.ev.on('messages.upsert', async (chatUpdate) => {
        try {
          const m = chatUpdate.messages[0];
          if (!m.message || m.key.fromMe) return;

          if (MessageProcessor) {
            const processor = new MessageProcessor(this, this.sock);
            await processor.handle(m);
          }
        } catch (err) {
          console.error('❌ Erro ao processar mensagem recebida:', err.message);
        }
      });

    } catch (error) {
      console.error('❌ Falha crítica no BotCore:', error);
      throw error;
    }
  }

  /**
   * Status e Acesso para a UI
   */
  getStatus() {
    return {
      isConnected: this.isConnected,
      reconnectAttempts: this.reconnectAttempts,
      botName: this.config.BOT_NAME || 'Akira Bot'
    };
  }

  getQRCode() {
    return this.currentQR;
  }

  /**
   * Envio de mensagem com tratamento global
   */
  async sendMessage(jid, content, options = {}) {
    try {
      if (!this.isConnected || !this.sock) return false;
      return await this.sock.sendMessage(jid, content, options);
    } catch (err) {
      console.error(`❌ Falha no envio para ${jid}:`, err.message);
      return false;
    }
  }
}

module.exports = BotCore;