/* ----------------------------------------------------------------------------

 Question Server
 GitLab: <https://gitlab.com/MrFry/mrfrys-node-server>

 This program is free software: you can redistribute it and/or modify
 it under the terms of the GNU General Public License as published by
 the Free Software Foundation, either version 3 of the License, or
 (at your option) any later version.

 This program is distributed in the hope that it will be useful,
 but WITHOUT ANY WARRANTY; without even the implied warranty of
 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 GNU General Public License for more details.

 You should have received a copy of the GNU General Public License
 along with this program. If not, see <https://www.gnu.org/licenses/>.

 ------------------------------------------------------------------------- */

import { Server as socket, Socket } from 'socket.io'

import utils from '../../../utils/utils'
import dbtools from '../../../utils/dbtools'
import logger from '../../../utils/logger'
import { Request, SubmoduleData, User } from '../../../types/basicTypes'
import socketAuth from '../../../middlewares/socketAuth.middleware'

const msgDbPath = './data/dbs/msgs.db'
const msgPaginationLimit = 15

interface ExtendedSocket extends Socket {
  user: User
}

interface Message {
  id: number
  sender: number
  reciever: number
  msg: string
  type: string
  date: number
  unread: number
}

function setup(data: SubmoduleData): void {
  const { app, httpServer, httpsServer, userDB, publicdirs } = data
  const msgDB = dbtools.GetDB(msgDbPath)

  const publicDir = publicdirs[0]
  const uloadFiles = publicDir + 'chatFiles'
  logger.Log(`Starting Socket.io Server on ${httpsServer ? 'https' : 'http'}`)
  // https://socket.io/docs/v4/handling-cors/#Configuration
  const io = new socket(httpsServer || httpServer, {
    cors: {
      credentials: true,
      origin: true,
    },
  })

  function chatMessageRead({
    sender,
    reciever,
  }: {
    sender: number
    reciever: number
  }) {
    dbtools.runStatement(
      msgDB,
      `update msgs
         set unread = 0
         where sender = ${sender} and reciever = ${reciever}`,
      'run'
    )
    io.sockets.in(sender.toString()).emit('chat message read', {
      userReadMsg: reciever,
    })
  }

  io.use(socketAuth({ userDB: userDB }))

  io.on('connection', (socket: ExtendedSocket) => {
    const userid = socket.user.id

    socket.on('join', function (/*data*/) {
      socket.join(userid.toString())

      const groups: number[] = dbtools
        .runStatement(
          msgDB,
          `select * from
          (
            select sender as a
            from msgs 
            where sender = ${userid} or reciever = ${userid}
            union
            select reciever
            from msgs
            where sender = ${userid} or reciever = ${userid}
          )t
          order by t.a asc`
        )
        .reduce((acc: number[], x: { a: number }) => {
          if (x.a !== userid) acc.push(x.a)
          return acc
        }, [])

      socket.emit('prev messages', {
        prevMsgs: groups.map((to) => {
          const first: Message = dbtools.runStatement(
            msgDB,
            `select * from msgs
            where sender = ${userid} and reciever = ${to} or
            sender = ${to} and reciever = ${userid}
            order by date desc
            limit 1`
          )[0]
          return first
        }),
      })

      socket.on('get chat messages', (data) => {
        const { chatPartner, from } = data

        const msgs = dbtools.runStatement(
          msgDB,
          `select * from msgs
            where (sender = ${userid} and reciever = ${chatPartner} or
            sender = ${chatPartner} and reciever = ${userid})
            ${from ? `and date < ${from}` : ''}
            order by date desc
            limit ${msgPaginationLimit}`
        )

        socket.emit('get chat messages', {
          requestsdMsgs: msgs,
          hasMore: msgs.length === msgPaginationLimit,
        })

        // Read update
        chatMessageRead({ sender: chatPartner, reciever: userid })
      })

      socket.on('chat message read', (data) => {
        const { chatPartner } = data
        chatMessageRead({ sender: chatPartner, reciever: userid })
      })

      socket.on('chat message', (message) => {
        const { reciever, msg, type } = message
        const recieverUser = dbtools.Select(userDB, 'users', {
          id: reciever,
        })[0]
        if (!recieverUser) {
          socket.emit('chat message', {
            success: false,
            date: new Date().getTime(),
            sender: reciever,
            reciever: userid,
            type: 'text',
            msg: `A #${reciever} számú felhasználó nem létezik`,
          })
          return
        }

        const msgObj = {
          sender: userid,
          reciever: parseInt(reciever),
          msg: dbtools.sanitizeQuery(msg),
          type: type || 'text',
          date: new Date().getTime(),
          unread: 1,
        }
        dbtools.Insert(msgDB, 'msgs', msgObj)
        if (userid !== reciever) {
          io.sockets.in(reciever.toString()).emit('chat message', msgObj)
        }
      })
    })

    // socket.on('disconnect', () => {})
    // socket.on('close', () => {})
  })

  app.post('/postchatfile', function (req: Request, res) {
    logger.LogReq(req)
    utils
      .uploadFile(req, uloadFiles)
      .then((result) => {
        res.json({
          success: true,
          path: result.filePath.replace(publicDir, ''),
        })
      })
      .catch(() => {
        res.json({ success: false, msg: 'error during uploading' })
        return
      })
  })

  app.get('/hasNewMsg', (req: Request, res) => {
    const user: User = req.session.user
    const userid: number = user.id

    const groups = dbtools
      .runStatement(
        msgDB,
        `select * from
         (
           select sender as a
           from msgs 
           where sender = ${userid} or reciever = ${userid}
           union
           select reciever
           from msgs
           where sender = ${userid} or reciever = ${userid}
         )t
         order by t.a asc`
      )
      .reduce((acc: number[], x: { a: number }) => {
        if (x.a !== userid) acc.push(x.a)
        return acc
      }, [])

    const prevMsgs = groups.map((to: number) => {
      const first = dbtools.runStatement(
        msgDB,
        `select * from msgs
         where sender = ${userid} and reciever = ${to} or
         sender = ${to} and reciever = ${userid}
         order by date desc
         limit 1`
      )[0]
      return first
    })

    res.json({
      unreads: prevMsgs.reduce((acc: number[], msg: Message) => {
        if (msg && msg.unread === 1 && msg.sender !== userid) {
          acc.push(msg.sender)
        }
        return acc
      }, []),
    })
  })
}

export default {
  setup: setup,
}