/**
 * BaileysManager - Manages multiple WhatsApp instances
 * Singleton pattern for managing all Baileys connections
 */
import type { WASocket, BaileysEventMap } from '@whiskeysockets/baileys'
import * as baileys from '@whiskeysockets/baileys'

// Get functions from baileys module (handle both ESM and CJS)
const makeWASocket = (baileys as any).default || (baileys as any).makeWASocket
const DisconnectReason = (baileys as any).DisconnectReason || (baileys as any).default?.DisconnectReason
const fetchLatestBaileysVersion = (baileys as any).fetchLatestBaileysVersion || (baileys as any).default?.fetchLatestBaileysVersion
const makeCacheableSignalKeyStore = (baileys as any).makeCacheableSignalKeyStore || (baileys as any).default?.makeCacheableSignalKeyStore
const Browsers = (baileys as any).Browsers || (baileys as any).default?.Browsers

// Debug: Log what we got from baileys
console.log('[Baileys] Module keys:', Object.keys(baileys))
console.log('[Baileys] makeWASocket:', typeof makeWASocket)
console.log('[Baileys] DisconnectReason:', typeof DisconnectReason)
console.log('[Baileys] fetchLatestBaileysVersion:', typeof fetchLatestBaileysVersion)
console.log('[Baileys] makeCacheableSignalKeyStore:', typeof makeCacheableSignalKeyStore)
console.log('[Baileys] Browsers:', typeof Browsers)

import { Boom } from '@hapi/boom'
import { EventEmitter } from 'events'
import QRCode from 'qrcode'
import pino from 'pino'
import { usePostgresAuthState, clearAuthState } from './auth-state'
import { query } from '../../utils/database'

// Types
export interface ManagedInstance {
  id: string
  name: string
  socket: WASocket | null
  status: 'disconnected' | 'connecting' | 'connected' | 'qr_ready' | 'pairing'
  phoneNumber: string | null
  qrCode: string | null
  pairingCode: string | null
  reconnectAttempts: number
  lastError: string | null
}

export interface InstanceEvents {
  'instance.status': { instanceId: string; status: string; phoneNumber?: string }
  'instance.qr': { instanceId: string; qr: string; qrDataUrl: string }
  'instance.pairing': { instanceId: string; code: string }
  'message.received': { instanceId: string; message: any }
  'message.sent': { instanceId: string; message: any }
  'message.status': { instanceId: string; messageId: string; status: string }
}

const logger = pino({ level: 'warn' })

class BaileysManager extends EventEmitter {
  private instances: Map<string, ManagedInstance> = new Map()
  private static instance: BaileysManager | null = null
  private initialized = false

  private constructor() {
    super()
  }

  static getInstance(): BaileysManager {
    if (!BaileysManager.instance) {
      BaileysManager.instance = new BaileysManager()
    }
    return BaileysManager.instance
  }

  /**
   * Initialize manager and reconnect previously connected instances
   */
  async initialize(): Promise<void> {
    if (this.initialized) return

    console.log('[BaileysManager] Initializing...')

    try {
      // Load instances that were previously connected
      const result = await query<{ id: string; name: string; phone_number: string }>(
        `SELECT id, name, phone_number FROM instances WHERE status = 'connected'`
      )

      for (const row of result.rows) {
        console.log(`[BaileysManager] Reconnecting instance: ${row.name}`)
        await this.connect(row.id)
      }

      this.initialized = true
      console.log('[BaileysManager] Initialized successfully')
    } catch (error) {
      console.error('[BaileysManager] Initialization error:', error)
    }
  }

  /**
   * Connect an instance to WhatsApp
   */
  async connect(instanceId: string, usePairingCode = false, phoneNumber?: string): Promise<void> {
    // Check if already connected
    const existing = this.instances.get(instanceId)
    if (existing?.socket) {
      console.log(`[BaileysManager] Instance ${instanceId} already has active socket`)
      return
    }

    // Load instance from DB
    const instanceResult = await query<{ id: string; name: string; phone_number: string }>(
      'SELECT id, name, phone_number FROM instances WHERE id = $1',
      [instanceId]
    )

    if (instanceResult.rows.length === 0) {
      throw new Error(`Instance ${instanceId} not found`)
    }

    const instanceData = instanceResult.rows[0]

    // Update status
    await this.updateInstanceStatus(instanceId, 'connecting')

    // Create managed instance
    const managed: ManagedInstance = {
      id: instanceId,
      name: instanceData.name,
      socket: null,
      status: 'connecting',
      phoneNumber: instanceData.phone_number || null,
      qrCode: null,
      pairingCode: null,
      reconnectAttempts: 0,
      lastError: null
    }
    this.instances.set(instanceId, managed)

    try {
      console.log(`[BaileysManager] Loading auth state for ${instanceId}...`)
      // Load auth state from PostgreSQL
      const { state, saveCreds } = await usePostgresAuthState(instanceId)
      console.log(`[BaileysManager] Auth state loaded, creds registered:`, state.creds?.registered)

      console.log(`[BaileysManager] Fetching latest Baileys version...`)
      const { version } = await fetchLatestBaileysVersion()
      console.log(`[BaileysManager] Using Baileys version:`, version)

      console.log(`[BaileysManager] Creating WASocket...`)
      // Create socket
      const socket = makeWASocket({
        version,
        auth: {
          creds: state.creds,
          keys: makeCacheableSignalKeyStore(state.keys, logger)
        },
        browser: Browsers.ubuntu('WhatsApp Nucleo'),
        logger: pino({ level: 'debug' }),
        generateHighQualityLinkPreview: true,
        syncFullHistory: false,
        markOnlineOnConnect: false
      })
      console.log(`[BaileysManager] WASocket created successfully`)

      managed.socket = socket

      // Setup event handlers
      console.log(`[BaileysManager] Setting up event handlers...`)
      this.setupEventHandlers(instanceId, socket, saveCreds, usePairingCode, phoneNumber)
      console.log(`[BaileysManager] Event handlers set up, waiting for connection events...`)

    } catch (error) {
      console.error(`[BaileysManager] Error connecting instance ${instanceId}:`, error)
      managed.lastError = (error as Error).message
      await this.updateInstanceStatus(instanceId, 'disconnected')
      throw error
    }
  }

  /**
   * Setup event handlers for a socket
   */
  private setupEventHandlers(
    instanceId: string,
    socket: WASocket,
    saveCreds: () => Promise<void>,
    usePairingCode: boolean,
    phoneNumber?: string
  ): void {
    const managed = this.instances.get(instanceId)!

    // Credentials update
    socket.ev.on('creds.update', saveCreds)

    // Connection update
    socket.ev.on('connection.update', async (update) => {
      console.log(`[BaileysManager] connection.update event:`, JSON.stringify(update, null, 2))
      const { connection, lastDisconnect, qr } = update

      // QR Code received
      if (qr) {
        console.log(`[BaileysManager] QR code received! Length: ${qr.length}`)
        try {
          const qrDataUrl = await QRCode.toDataURL(qr)
          console.log(`[BaileysManager] QR DataURL generated, length: ${qrDataUrl.length}`)
          managed.qrCode = qrDataUrl
          managed.status = 'qr_ready'

          await this.updateInstanceStatus(instanceId, 'qr_ready', { qr_code: qrDataUrl })
          console.log(`[BaileysManager] QR saved to database`)
          this.emit('instance.qr', { instanceId, qr, qrDataUrl })
        } catch (err) {
          console.error(`[BaileysManager] Error generating QR:`, err)
        }
      }

      // Request pairing code if needed
      if (usePairingCode && phoneNumber && !managed.pairingCode && connection === 'connecting') {
        try {
          // Wait a bit for socket to be ready
          await new Promise(resolve => setTimeout(resolve, 3000))

          if (!socket.authState.creds.registered) {
            const code = await socket.requestPairingCode(phoneNumber)
            managed.pairingCode = code
            managed.status = 'pairing'

            await this.updateInstanceStatus(instanceId, 'pairing', { pairing_code: code })
            this.emit('instance.pairing', { instanceId, code })
          }
        } catch (error) {
          console.error(`[BaileysManager] Error requesting pairing code:`, error)
        }
      }

      // Connection closed
      if (connection === 'close') {
        const statusCode = (lastDisconnect?.error as Boom)?.output?.statusCode
        const shouldReconnect = statusCode !== DisconnectReason.loggedOut

        managed.socket = null
        managed.qrCode = null
        managed.pairingCode = null

        if (shouldReconnect && managed.reconnectAttempts < 5) {
          managed.reconnectAttempts++
          console.log(`[BaileysManager] Reconnecting instance ${instanceId} (attempt ${managed.reconnectAttempts})`)

          // Wait before reconnecting
          await new Promise(resolve => setTimeout(resolve, 3000 * managed.reconnectAttempts))
          await this.connect(instanceId)
        } else {
          managed.status = 'disconnected'
          await this.updateInstanceStatus(instanceId, 'disconnected')

          if (statusCode === DisconnectReason.loggedOut) {
            // Clear auth state if logged out
            await clearAuthState(instanceId)
          }
        }

        this.emit('instance.status', { instanceId, status: 'disconnected' })
      }

      // Connection open
      if (connection === 'open') {
        const phoneNum = socket.user?.id.split(':')[0] || null
        managed.status = 'connected'
        managed.phoneNumber = phoneNum
        managed.qrCode = null
        managed.pairingCode = null
        managed.reconnectAttempts = 0

        await this.updateInstanceStatus(instanceId, 'connected', {
          phone_number: phoneNum,
          qr_code: null,
          pairing_code: null,
          last_connected_at: new Date()
        })

        this.emit('instance.status', { instanceId, status: 'connected', phoneNumber: phoneNum || undefined })
        console.log(`[BaileysManager] Instance ${instanceId} connected as ${phoneNum}`)
      }
    })

    // Messages received
    socket.ev.on('messages.upsert', async ({ messages, type }) => {
      for (const msg of messages) {
        // Emit event for webhooks
        this.emit('message.received', { instanceId, message: msg })

        // Save message to database
        await this.saveMessage(instanceId, msg, type === 'notify')
      }
    })

    // Message status update
    socket.ev.on('messages.update', async (updates) => {
      for (const update of updates) {
        if (update.update.status) {
          this.emit('message.status', {
            instanceId,
            messageId: update.key.id!,
            status: this.mapMessageStatus(update.update.status)
          })
        }
      }
    })
  }

  /**
   * Disconnect an instance
   */
  async disconnect(instanceId: string): Promise<void> {
    const managed = this.instances.get(instanceId)
    if (!managed?.socket) return

    managed.socket.end(new Error('Disconnected by user'))
    managed.socket = null
    managed.status = 'disconnected'
    managed.qrCode = null
    managed.pairingCode = null

    await this.updateInstanceStatus(instanceId, 'disconnected')
    this.emit('instance.status', { instanceId, status: 'disconnected' })
  }

  /**
   * Send a message
   */
  async sendMessage(instanceId: string, jid: string, content: any): Promise<any> {
    const managed = this.instances.get(instanceId)
    if (!managed?.socket) {
      throw new Error('Instance not connected')
    }

    const result = await managed.socket.sendMessage(jid, content)
    this.emit('message.sent', { instanceId, message: result })
    return result
  }

  /**
   * Get QR code for an instance
   */
  getQRCode(instanceId: string): string | null {
    return this.instances.get(instanceId)?.qrCode || null
  }

  /**
   * Get pairing code for an instance
   */
  getPairingCode(instanceId: string): string | null {
    return this.instances.get(instanceId)?.pairingCode || null
  }

  /**
   * Get instance status
   */
  getStatus(instanceId: string): ManagedInstance | null {
    return this.instances.get(instanceId) || null
  }

  /**
   * Get all instances
   */
  getAllInstances(): ManagedInstance[] {
    return Array.from(this.instances.values())
  }

  /**
   * Update instance status in database
   */
  private async updateInstanceStatus(
    instanceId: string,
    status: string,
    extra: Record<string, any> = {}
  ): Promise<void> {
    const fields = ['status = $2']
    const values: any[] = [instanceId, status]
    let paramIndex = 3

    for (const [key, value] of Object.entries(extra)) {
      fields.push(`${key} = $${paramIndex}`)
      values.push(value)
      paramIndex++
    }

    await query(
      `UPDATE instances SET ${fields.join(', ')}, updated_at = NOW() WHERE id = $1`,
      values
    )
  }

  /**
   * Save message to database
   */
  private async saveMessage(instanceId: string, msg: any, isNew: boolean): Promise<void> {
    try {
      const jid = msg.key.remoteJid
      if (!jid) return

      // Ensure chat exists
      const chatResult = await query<{ id: string }>(
        `INSERT INTO chats (instance_id, jid, name, is_group)
         VALUES ($1, $2, $3, $4)
         ON CONFLICT (instance_id, jid) DO UPDATE SET updated_at = NOW()
         RETURNING id`,
        [instanceId, jid, msg.pushName || jid.split('@')[0], jid.includes('@g.us')]
      )
      const chatId = chatResult.rows[0].id

      // Get message content
      const content = msg.message?.conversation ||
        msg.message?.extendedTextMessage?.text ||
        msg.message?.imageMessage?.caption ||
        ''

      const messageType = this.getMessageType(msg.message)

      // Insert message
      await query(
        `INSERT INTO messages (
          instance_id, chat_id, message_id, from_jid, from_me,
          message_type, content, timestamp, raw_message
        ) VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9)
         ON CONFLICT (instance_id, message_id) DO NOTHING`,
        [
          instanceId,
          chatId,
          msg.key.id,
          msg.key.fromMe ? 'me' : jid,
          msg.key.fromMe || false,
          messageType,
          content,
          new Date(msg.messageTimestamp! * 1000),
          JSON.stringify(msg)
        ]
      )

      // Update chat last message
      if (isNew) {
        await query(
          `UPDATE chats SET last_message_at = $1, unread_count = unread_count + 1 WHERE id = $2`,
          [new Date(msg.messageTimestamp! * 1000), chatId]
        )
      }
    } catch (error) {
      console.error('[BaileysManager] Error saving message:', error)
    }
  }

  /**
   * Get message type from Baileys message object
   */
  private getMessageType(message: any): string {
    if (!message) return 'unknown'
    if (message.conversation || message.extendedTextMessage) return 'text'
    if (message.imageMessage) return 'image'
    if (message.videoMessage) return 'video'
    if (message.audioMessage) return 'audio'
    if (message.documentMessage) return 'document'
    if (message.stickerMessage) return 'sticker'
    if (message.contactMessage) return 'contact'
    if (message.locationMessage) return 'location'
    return 'unknown'
  }

  /**
   * Map Baileys message status to our status
   */
  private mapMessageStatus(status: number): string {
    switch (status) {
      case 0: return 'pending'
      case 1: return 'sent'
      case 2: return 'delivered'
      case 3: return 'read'
      case 4: return 'read'
      default: return 'sent'
    }
  }
}

// Export singleton
export const baileysManager = BaileysManager.getInstance()