require('dotenv').config();
const express = require('express');
const app = express();
const path = require('path');
const crypto = require('crypto');
const http = require('http').createServer(app);
const cors = require('cors');
const jwt = require('jsonwebtoken');
const moment = require('moment-jalaali');
const MessageModel = require('./models/MessageModel');
const fs = require('fs-extra');
const cron = require('node-cron');
const UserModel = require('./models/UserModel');
const {
  purgeExpiredDeactivatedAccounts,
  purgeExpiredTombstones
} = require('./utils/accountLifecycle');
const blockCheck = require('./middlewares/blockCheck');
const chatPeerBlock = require('./middlewares/chatPeerBlock');
const createRateLimiter = require('./utils/createRateLimiter');
const { default: axios } = require('axios');
const { markOnline, markOffline } = require('./utils/presence');
const { invalidateUnreadMessages } = require('./utils/unreadMessagesCache');

const allowedOrigins = [
  'http://localhost:3000',
  'http://localhost:3001',  // اضافه شد — مهم برای توسعه فرانت
  'http://localhost:3002',
  'http://localhost:3003',
  'http://localhost:3004',
  'http://localhost',
  'https://modstagram.com',
  'http://modstagram.com',
  'http://193.151.143.243:3004',
  'https://www.modstagram.com',
  'https://app.modstagram.com',
  'https://www.app.modstagram.com',
  'https://panel.modstagram.com',
  'https://www.panel.modstagram.com',
  'ionic://localhost',
  'capacitor://localhost',
  // IPهای محلی (برای تست در شبکه داخلی)/
  /^http:\/\/192\.168\.\d{1,3}\.\d{1,3}:\d+$/,
  /^http:\/\/10\.\d{1,3}\.\d{1,3}\.\d{1,3}:\d+$/,
];

app.use(cors({
  origin: (origin, callback) => {
    // در محیط توسعه، همه originها مجاز باشن
    if (process.env.NODE_ENV !== 'production') {
      return callback(null, true);
    }

    // اگر origin وجود نداشته باشه (مثل درخواست از موبایل یا Postman) اجازه بده
    if (!origin) {
      return callback(null, true);
    }

    // چک لیست یا RegExp
    const isAllowed = allowedOrigins.some(item => {
      if (typeof item === 'string') return item === origin;
      if (item instanceof RegExp) return item.test(origin);
      return false;
    });

    if (isAllowed) {
      callback(null, true);
    } else {
      callback(new Error('Not allowed by CORS'));
    }
  },
  methods: ['GET', 'POST', 'PUT', 'DELETE', 'PATCH', 'OPTIONS'],
  allowedHeaders: ['Content-Type', 'Authorization', 'X-Requested-With', 'x-no-toast'],
  credentials: true,
  optionsSuccessStatus: 200 // برای مرورگرهای قدیمی
}));

// Socket.IO CORS
const io = require('socket.io')(http, {
  cors: {
    origin: (origin, callback) => {
      if (process.env.NODE_ENV !== 'production') {
        return callback(null, true);
      }

      if (!origin) {
        return callback(null, true);
      }

      const isAllowed = allowedOrigins.some(item => {
        if (typeof item === 'string') return item === origin;
        if (item instanceof RegExp) return item.test(origin);
        return false;
      });

      if (isAllowed) {
        callback(null, true);
      } else {
        callback(new Error('Not allowed by CORS'));
      }
    },
    methods: ['GET', 'POST', 'PATCH', 'PUT', 'DELETE', 'OPTIONS'],
    credentials: true
  }
});

app.set('io', io);

// افزایش limit برای Base64 (1000mb کافیه)
app.use(express.json({ limit: '1000mb' }));
app.use(express.urlencoded({ limit: '1000mb', extended: true }));

// مسیرهای مشخص قبل از /storage عمومی — پروفایل از هر دو محل (قدیم و جدید) سرو می‌شود
app.use('/storage/profiles', express.static(path.join(__dirname, '../storage/profiles')));
app.use('/storage/profiles', express.static(path.join(__dirname, 'storage/profiles')));
app.use('/storage/carts', express.static(path.join(__dirname, '../storage/carts')));
app.use('/storage/carts', express.static(path.join(__dirname, 'storage/carts')));
app.use('/storage/posts', express.static(path.join(__dirname, 'storage/posts')));
app.use('/storage/posts', express.static(path.join(__dirname, '../storage/posts')));
app.use('/storage/messages', express.static(path.join(__dirname, '../storage/messages')));
app.use('/storage/messages', express.static(path.join(__dirname, 'storage/messages')));
app.use('/storage/shop-chat', express.static(path.join(__dirname, '../storage/shop-chat')));
app.use('/storage/shop-chat', express.static(path.join(__dirname, 'storage/shop-chat')));
app.use('/storage/chat-rooms', express.static(path.join(__dirname, '../storage/chat-rooms')));
app.use('/storage/chat-rooms', express.static(path.join(__dirname, 'storage/chat-rooms')));
app.use('/storage/tickets', express.static(path.join(__dirname, '../storage/tickets')));
app.use('/storage/tickets', express.static(path.join(__dirname, 'storage/tickets')));
app.use('/storage/advertising', express.static(path.join(__dirname, '../storage/advertising')));
app.use('/storage/advertising', express.static(path.join(__dirname, 'storage/advertising')));
app.use('/storage/services', express.static(path.join(__dirname, '../storage/services')));
app.use('/storage/services', express.static(path.join(__dirname, 'storage/services')));
app.use('/storage', express.static(path.join(__dirname, 'storage')));

require('./boot');

// غیرفعال کردن پارس‌کننده‌های بدنه برای روت‌های آپلود فایل
app.use((req, res, next) => {
  if (req.path === '/api/v1/posts/create' && req.method === 'POST') {
    console.log('DEBUG: Skipping body parsers for /api/v1/posts/create');
    return next();
  }
  express.json()(req, res, next);
});
app.use((req, res, next) => {
  if (req.path === '/api/v1/posts/create' && req.method === 'POST') {
    return next();
  }
  express.urlencoded({ extended: true })(req, res, next);
});

require('./middlewares')(app);

const limiter = createRateLimiter('global', {
  windowMs: 3 * 60 * 1000,
  max: 3000,
  standardHeaders: true,
  legacyHeaders: false,
  message: 'تعداد درخواست‌های شما بیشتر از حد مجاز است، لطفاً بعداً دوباره تلاش کنید.',
  handler: (req, res) => {
    const retryAfter = Math.ceil((req.rateLimit.resetTime - Date.now()) / 1000);
    res.set('Retry-After', retryAfter);
    res.status(429).json({
      error: `شما بیش از حد مجاز درخواست ارسال کرده‌اید. لطفاً بعد از ${retryAfter} ثانیه دوباره تلاش کنید.`
    });
  }
});
app.use(limiter);
app.set('trust proxy', 'loopback');

require('./routes')(app);

const { enrichMessage, emitChatEvents, parseForwardedContent } = require('./helpers/chatHelpers')
const {
  parseSelfDestructSeconds,
  buildExpiresAt,
  activeMessageFilter,
  purgeExpiredMessages,
  scheduleMessageExpiry,
  deleteMessagesAndNotify,
  isWithinDeleteWindow,
  markSelfDestructViewed,
  startPendingSelfDestructForViewer
} = require('./helpers/expiredMessages')
const { purgeInactiveChatRooms } = require('./controllers/application/chatRooms/chatRoomHelpers')
const { trackOfferMessageForCommission } = require('./utils/offerReplyGate')
const {
  parseViewOnce,
  isViewOnceMediaType,
  sanitizeMessageForViewer,
  openViewOnceMessage,
  completeViewOnceMessage
} = require('./helpers/viewOnceMessages')

const mongoose = require('mongoose')

app.get('/api/v1/chat', [blockCheck, chatPeerBlock], async (req, res) => {
  try {
    const userId = String(req.user._id)
    const { senderId, receiverId, limit, page } = req.query

    if (!senderId || !receiverId) {
      return res.status(400).json({ error: 'senderId and receiverId are required' })
    }

    if (String(senderId) !== userId) {
      return res.status(403).json({ error: 'Forbidden' })
    }

    if (
      !mongoose.Types.ObjectId.isValid(String(senderId)) ||
      !mongoose.Types.ObjectId.isValid(String(receiverId))
    ) {
      return res.status(400).json({ error: 'Invalid senderId or receiverId' })
    }

    const sid = new mongoose.Types.ObjectId(String(senderId))
    const rid = new mongoose.Types.ObjectId(String(receiverId))
    const pageNumber = parseInt(page) || 1
    const limitPerPage = parseInt(limit) || 40

    const filter = activeMessageFilter({
      $or: [
        { senderId: sid, receiverId: rid },
        { senderId: rid, receiverId: sid }
      ]
    })

    const totalMessagesCount = await MessageModel.countDocuments(filter)
    const totalPages = Math.ceil(totalMessagesCount / limitPerPage) || 1
    const skip = (pageNumber - 1) * limitPerPage

    const messages = await MessageModel.find(filter)
      .sort({ createdAt: -1 })
      .skip(skip)
      .limit(limitPerPage)

    await MessageModel.updateMany(
      { _id: { $in: messages.map((m) => m._id) }, receiverId: sid },
      { $set: { readStatus: 1 } }
    )
    invalidateUnreadMessages(String(sid)).catch(() => {})

    await startPendingSelfDestructForViewer(io, sid, rid)

    const enriched = await Promise.all(
      messages.map((m) =>
        enrichMessage(sanitizeMessageForViewer(m, sid))
      )
    )
    res.json({ messages: enriched.reverse(), totalPages })
  } catch (error) {
    console.error('Error fetching messages:', error)
    res.status(500).json({ error: 'Server error' })
  }
})

app.post('/api/v1/chat', [blockCheck, chatPeerBlock], async (req, res) => {
  try {
    const senderId = String(req.user._id)
    const { receiverId, content, replyToId, forwardedFrom: fwdBody, selfDestructSeconds, fileType } = req.body
    // اگر کلاینت اشتباهاً آبجکت E2EE فرستاد، به رشته تبدیل کن
    const contentInput =
      content && typeof content === 'object' ? JSON.stringify(content) : content
    const { body, forwardedFrom: fwdParsed } = parseForwardedContent(contentInput)
    const destructSec = parseSelfDestructSeconds(selfDestructSeconds)

    if (!receiverId) {
      return res.status(422).json({ error: 'receiverId is required' })
    }

    const payload = {
      senderId,
      receiverId,
      content: body || contentInput,
      replyToId: replyToId || undefined,
      forwardedFrom: fwdBody || fwdParsed || undefined,
      selfDestructSeconds: destructSec || undefined,
      fileType: fileType || undefined
    }

    const newMessage = new MessageModel(payload)
    await newMessage.save()
    const formatted = await enrichMessage(newMessage)

    res.status(201).json({ data: formatted })
    emitChatEvents(io, formatted, senderId, receiverId)
    invalidateUnreadMessages(String(receiverId)).catch(() => {})
    trackOfferMessageForCommission(io, senderId, receiverId).catch((err) =>
      console.error('trackOfferMessageForCommission error:', err)
    )
  } catch (error) {
    console.error('Error sending message:', error)
    res.status(500).json({ error: 'Server error' })
  }
})
app.post('/api/v1/chat/reaction', [blockCheck, chatPeerBlock], async (req, res) => {
  try {
    const userId = String(req.user._id)
    const { messageId, emoji } = req.body
    if (!messageId || !emoji) {
      return res.status(400).json({ error: 'messageId and emoji are required' })
    }

    const msg = await MessageModel.findById(messageId)
    if (!msg) return res.status(404).json({ error: 'Message not found' })

    const sid = String(msg.senderId)
    const rid = String(msg.receiverId)
    if (userId !== sid && userId !== rid) {
      return res.status(403).json({ error: 'Forbidden' })
    }

    let reactions = Array.isArray(msg.reactions) ? [...msg.reactions] : []
    const idx = reactions.findIndex((r) => String(r.userId) === userId)
    if (idx >= 0 && reactions[idx].emoji === emoji) {
      reactions.splice(idx, 1)
    } else if (idx >= 0) {
      reactions[idx] = { userId, emoji }
    } else {
      reactions.push({ userId, emoji })
    }

    msg.reactions = reactions
    await msg.save()
    const formatted = await enrichMessage(msg)

    io.to(`chat:${sid}:${rid}`).to(`chat:${rid}:${sid}`).emit('messageReaction', {
      messageId: String(msg._id),
      reactions: formatted.reactions
    })

    res.json({ data: formatted })
  } catch (error) {
    console.error('Error updating reaction:', error)
    res.status(500).json({ error: 'Server error' })
  }
})

app.get('/api/v1/chat/read', [blockCheck, chatPeerBlock], async (req, res) => {
  try {
    const userId = String(req.user._id)
    const { senderId, receiverId } = req.query

    if (String(senderId) !== userId) {
      return res.status(403).json({ error: 'Forbidden' })
    }

    const messages = await MessageModel.find(
      { senderId: receiverId, receiverId: senderId }
    )
    await MessageModel.updateMany({ _id: { $in: messages.map(message => message._id) } }, { $set: { readStatus: 1 } })
    invalidateUnreadMessages(userId).catch(() => {})
    await startPendingSelfDestructForViewer(io, userId, receiverId)
    res.status(200).json({ message: 'Message read status updated successfully' })
  } catch (error) {
    console.error('Error updating message read status:', error)
    res.status(500).json({ error: 'Server error' })
  }
})

// این endpoint قبلاً بدون auth بود و کلید SMS را لو می‌داد — غیرفعال شد
app.post('/api/v1/notification/send-sms', [blockCheck], async (req, res) => {
  return res.status(410).json({
    error: true,
    message: 'این سرویس غیرفعال شده است'
  })
})

app.post('/api/v1/chat/file', [blockCheck, chatPeerBlock], async (req, res) => {
  try {
    const senderId = String(req.user._id)
    const { receiverId, content, replyToId, fileType, selfDestructSeconds, viewOnce } = req.body
    const destructSec = parseSelfDestructSeconds(selfDestructSeconds)
    const viewOnceFlag = parseViewOnce(viewOnce)
    const resolvedFileType = fileType || undefined

    if (!receiverId) {
      return res.status(422).json({ error: 'receiverId is required' })
    }

    if (viewOnceFlag && !isViewOnceMediaType(resolvedFileType)) {
      return res.status(422).json({ error: 'View once is only for image, video, and voice' })
    }
    const { file } = req.files
    let fileUrl = null
    if (file) {
      const uploadDir = path.join(__dirname, '../storage/messages')
      if (!fs.existsSync(uploadDir)) {
        fs.mkdirSync(uploadDir, { recursive: true })
      }
      // اسمِ فایل هیچ‌وقت مستقیم از ورودیِ کاربر (file.name) گرفته نمی‌شه — فقط
      // پسوندش؛ وگرنه یه filename مثل ../../../../etc/passwd می‌تونست از uploadDir
      // بیرون بزنه (path traversal / نوشتنِ فایلِ دلخواه روی سرور)
      const uniqueFileName = `${Date.now()}-${crypto.randomUUID()}${path.extname(file.name || '')}`
      const filePath = path.join(uploadDir, uniqueFileName)
      await fs.move(file.path, filePath)
      fileUrl = `/messages/${uniqueFileName}`
    }

    const newMessage = new MessageModel({
      senderId,
      receiverId,
      content: content || '',
      file: fileUrl,
      fileType: resolvedFileType,
      replyToId: replyToId || undefined,
      selfDestructSeconds: destructSec || undefined,
      viewOnce: viewOnceFlag
    })
    await newMessage.save()
    const formatted = await enrichMessage(newMessage)

    res.status(201).json({ data: formatted })
    emitChatEvents(io, formatted, senderId, receiverId)
    invalidateUnreadMessages(String(receiverId)).catch(() => {})
    trackOfferMessageForCommission(io, senderId, receiverId).catch((err) =>
      console.error('trackOfferMessageForCommission error:', err)
    )
  } catch (error) {
    console.error('Error sending message:', error)
    res.status(500).json({ error: 'Server error' })
  }
})

app.post('/api/v1/chat/view-once/open', [blockCheck], async (req, res) => {
  try {
    const userId = String(req.user._id)
    const { messageId } = req.body
    if (!messageId) {
      return res.status(422).json({ error: 'messageId is required' })
    }

    const result = await openViewOnceMessage(messageId, userId)
    if (result.error) {
      return res.status(result.status || 400).json({ error: result.error })
    }

    res.json({
      file: result.file,
      fileType: result.fileType,
      messageId: String(result.message._id)
    })
  } catch (error) {
    console.error('view-once open error:', error)
    res.status(500).json({ error: 'Server error' })
  }
})

app.post('/api/v1/chat/view-once/complete', [blockCheck], async (req, res) => {
  try {
    const userId = String(req.user._id)
    const { messageId } = req.body
    if (!messageId) {
      return res.status(422).json({ error: 'messageId is required' })
    }

    const result = await completeViewOnceMessage(io, messageId, userId)
    if (result.error) {
      return res.status(result.status || 400).json({ error: result.error })
    }

    res.json({ deletedIds: result.deletedIds })
  } catch (error) {
    console.error('view-once complete error:', error)
    res.status(500).json({ error: 'Server error' })
  }
})

app.delete('/api/v1/chat', [blockCheck], async (req, res) => {
  try {
    const userId = String(req.user._id)
    const { messageIds } = req.body

    if (!Array.isArray(messageIds) || messageIds.length === 0) {
      return res.status(422).json({ message: 'پیامی انتخاب نشده است' })
    }

    const messages = await MessageModel.find({
      _id: { $in: messageIds },
      senderId: userId
    })

    if (!messages.length) {
      return res.status(403).json({ message: 'فقط پیام‌های خودتان قابل حذف هستند' })
    }

    const deletable = messages.filter((m) => isWithinDeleteWindow(m.createdAt))
    const tooOld = messages.filter((m) => !isWithinDeleteWindow(m.createdAt))

    if (!deletable.length) {
      return res.status(403).json({
        message: 'فقط پیام‌های ۲۴ ساعت گذشته قابل حذف هستند'
      })
    }

    const deletedIds = await deleteMessagesAndNotify(io, deletable, { deletedBy: userId })

    res.json({
      deletedIds,
      skippedIds: tooOld.map((m) => String(m._id)),
      message:
        tooOld.length > 0
          ? `${deletedIds.length} پیام حذف شد. ${tooOld.length} پیام قدیمی‌تر از ۲۴ ساعت بودند.`
          : 'پیام‌ها حذف شدند'
    })
  } catch (error) {
    console.error('Error deleting messages:', error)
    res.status(500).json({ error: 'Server error' })
  }
})

app.post('/api/v1/chat/self-destruct/view', [blockCheck], async (req, res) => {
  try {
    const userId = String(req.user._id)
    const { messageId } = req.body
    if (!messageId) {
      return res.status(422).json({ error: 'messageId is required' })
    }

    const result = await markSelfDestructViewed(io, messageId, userId)
    if (!result.message) {
      return res.status(404).json({ error: 'پیام یافت نشد' })
    }

    res.json({
      messageId: String(result.message._id),
      expiresAt: result.expiresAt
    })
  } catch (error) {
    console.error('self-destruct view error:', error)
    res.status(500).json({ error: 'Server error' })
  }
})

// Errors
require('./middlewares/exception')(app)
require('./middlewares/404')(app)
io.use((socket, next) => {
  try {
    const token =
      socket.handshake.auth?.token ||
      (socket.handshake.headers?.authorization || '').split(' ')[1]

    if (!token) {
      return next(new Error('Unauthorized'))
    }

    const decoded = jwt.verify(token, process.env.APP_SECRET)
    if (!decoded?.id) {
      return next(new Error('Unauthorized'))
    }

    socket.data.userId = String(decoded.id)
    next()
  } catch (err) {
    next(new Error('Unauthorized'))
  }
})

io.on('connection', (socket) => {
  const authenticatedUserId = () => String(socket.data.userId || '')

  // اتصالِ سوکت خودش یعنی کاربر الان آنلاینه — بدون این، وضعیتِ presence فقط با
  // درخواست‌های HTTP (middlewares/lastOnline.js) رفرش می‌شد و کاربری که فقط اپ رو
  // باز نگه داشته (بدون درخواستِ REST جدید) بعد از ۹۰ ثانیه اشتباهاً آفلاین می‌شد
  const uidOnConnect = authenticatedUserId()
  if (uidOnConnect) void markOnline(uidOnConnect)

  socket.on('disconnect', () => {
    const uid = authenticatedUserId()
    if (uid) void markOffline(uid)
  })

  socket.on('joinUser', () => {
    const id = authenticatedUserId()
    if (id) socket.join(`user:${id}`)
  })

  socket.on('joinChat', ({ receiverId }) => {
    const uid = authenticatedUserId()
    const rid = receiverId != null ? String(receiverId).trim() : ''
    if (uid && rid) {
      socket.join(`chat:${uid}:${rid}`)
      socket.join(`chat:${rid}:${uid}`)
    }
  })

  socket.on('joinGroupRoom', async ({ roomId }) => {
    const uid = authenticatedUserId()
    const rid = roomId != null ? String(roomId).trim() : ''
    if (!uid || !rid || !mongoose.Types.ObjectId.isValid(rid)) return

    try {
      const ChatRoomModel = require('./models/ChatRoomModel')
      const room = await ChatRoomModel.findById(rid).select('members').lean()
      if (!room?.members?.some((m) => String(m) === uid)) return
      socket.join(`group:${rid}`)
    } catch (e) {
      console.error('joinGroupRoom auth error', e)
    }
  })

  socket.on('typing', ({ receiverId }) => {
    const sid = authenticatedUserId()
    const rid = String(receiverId || '').trim()
    if (!sid || !rid) return
    io.to(`chat:${rid}:${sid}`).emit('userTyping', { userId: sid })
  })

  socket.on('stopTyping', ({ receiverId }) => {
    const sid = authenticatedUserId()
    const rid = String(receiverId || '').trim()
    if (!sid || !rid) return
    io.to(`chat:${rid}:${sid}`).emit('userStoppedTyping', { userId: sid })
  })

  socket.on('messageSeen', async ({ messageId, senderId, receiverId }) => {
    try {
      const uid = authenticatedUserId()
      if (!uid || String(receiverId) !== uid) return

      if (messageId) {
        await MessageModel.findByIdAndUpdate(messageId, { readStatus: 1 })
        invalidateUnreadMessages(String(receiverId)).catch(() => {})
        await markSelfDestructViewed(io, messageId, receiverId)
        io.to(`chat:${receiverId}:${senderId}`).emit('messageStatusUpdate', {
          messageId,
          status: 'seen'
        })
      }
    } catch (e) {
      console.error('messageSeen error', e)
    }
  })
})

// Free Project
require('./services/AdvertisingCron')
require('./services/ProjectCron')
require('./services/OrderLifecycleCron').setIo(io)
require('./services/BookingLifecycleCron').setIo(io)
require('./services/BookingRepeatExpiryCron').setIo(io)
require('./services/SmartNotificationsCron').setIo(io)
require('./services/InstagramMediaSyncCron')
require('./utils/notifyFollowers').setIo(io)
require('./utils/partnerMatch').setIo(io)

cron.schedule('*/30 * * * * *', () => {
  purgeExpiredMessages(io).catch((err) => console.error('expired messages cron:', err))
})

cron.schedule('0 * * * *', () => {
  purgeInactiveChatRooms(io).catch((err) =>
    console.error('inactive chat rooms cron:', err)
  )
})

cron.schedule('0 0 1 * *', async () => {
  try {
    // درخواست همکاری رایگان یک‌بار در کل عمر حساب است — دیگر ماهانه ریست نمی‌شود
    await UserModel.updateMany({}, {
      daily_free_request: 1,
      last_free_request_date: new Date()
    })
    console.log('Monthly free requests reset for all users.')
  } catch (error) {
    console.error('Error resetting daily free requests:', error)
  }
}, {
  scheduled: true,
  timezone: 'Asia/Tehran'
})

cron.schedule('0 3 * * *', async () => {
  try {
    const purged = await purgeExpiredDeactivatedAccounts()
    await purgeExpiredTombstones()
    if (purged) console.log(`Purged ${purged} deactivated accounts`)
  } catch (error) {
    console.error('Account lifecycle cron error:', error)
  }
}, {
  scheduled: true,
  timezone: 'Asia/Tehran'
})

const port = process.env.APP_PORT || 3002;
http.listen(port, () => {
  console.log(`HTTP server is running on port ${port}`);
});