const express = require('express')
const bodyparser = require('body-parser')
const dotenv = require('dotenv')
dotenv.config({ path: '.env' })
const copyFolder = require('./helpers/copyFolder')
const createDir = require('./helpers/createDir')
const createFile = require('./helpers/createFile')
const path = require('path')
const db_info = require('./db_conn')
const fs = require('fs')
let mysql_conn = require('./helpers/mysql_conn.js')
const { exec, execSync, spawn } = require('child_process')

const startPm2Process = require('./helpers/startPm2Process')
const removeDir = require('./helpers/remove_dir')
const setSessionName = require('./helpers/setSessionNumber')
const getNumberFromName = require('./helpers/getNumberSequence')
const pm2 = require('pm2')
const bcrypt = require('bcrypt')
const OmnihitDBConn = require('./model/db_conn')

const app = express()

app.use(bodyparser.json())

app.get('/', function (req, res) {
  return res.send('Express + TypeScript Server')
})

app.post('/api/session', async function (req, res) {
  let { app_name, whatsappId, client_url, number } = req.body

  if (app_name) {
    app_name = app_name.trim()
  }

  console.log('__dirname: ', path.join(__dirname, '..', app_name))

  console.log(
    'app_name: ',
    app_name,
    ' | whatsappId: ',
    whatsappId,
    ' | client_url: ',
    client_url
  )

  const sessionsPath = path.join(__dirname, '..', 'sessions')

  const directoriesInDIrectory = fs
    .readdirSync(sessionsPath, { withFileTypes: true })
    .filter((item) => item.isDirectory())
    .map((item) => item.name)

  console.log('directoriesInDIrectory: ', directoriesInDIrectory)

  const dirExist = directoriesInDIrectory.filter((e) => e.trim() == app_name)

  let dirSessionsApp = path.join(sessionsPath, app_name)

  if (dirExist.length == 0) {
    let create = createDir(dirSessionsApp)

    if (!create) {
      res.status(500).json({ message: 'Cannot create the directory path!' })
      return
    }
  }

  let appPort = []

  let existSubDir = false

  for (let i = 0; i < directoriesInDIrectory.length; i++) {
    console.log('directoriesInDIrectory[i]', directoriesInDIrectory[i])

    const subDir = fs
      .readdirSync(path.join(sessionsPath, directoriesInDIrectory[i]), {
        withFileTypes: true,
      })
      .filter((item) => item.isDirectory())
      .map((item) => item.name)

    for (let x = 0; x < subDir.length; x++) {
      console.log('subdir: ', subDir[x])

      let whatsId = subDir[x].split('_')[0]

      if (whatsId == whatsappId && app_name == directoriesInDIrectory[i]) {
        let currPath = path.join(
          sessionsPath,
          directoriesInDIrectory[i],
          subDir[x]
        )

        console.log(
          'PATH: ',
          path.join(sessionsPath, directoriesInDIrectory[i], subDir[x])
        )

        let oldNumber = subDir[x].split('_')[1]

        if (oldNumber != number) {
          deletePm2Process(subDir[x], currPath)

          removeDir(currPath)
        } else {
          res.send('ok')
          return
        }
      }

      let auxPort = subDir[x].split('_')[3]

      console.log('---------> auxPort: ' + auxPort)

      if (auxPort) {
        auxPort = +auxPort.trim()

        if (!isNaN(auxPort)) {
          appPort.push(auxPort)
        }
      }

      existSubDir = true
    }
  }

  appPort = existSubDir ? Math.max(...appPort) + 1 : process.env.PORT_START

  console.log('new port: ', appPort)

  let dirSessionAppName

  let numberSession = 1

  let lstPass = process.env.PASS

  if (!lstPass) {
    console.log('PASS VARIABLE NOT FOUND INTO .ENV!')
    return res.send('OK')
  }

  let db_credentials
  try {
    db_credentials = await OmnihitDBConn.findOne({ client_url })

    if (!db_credentials) {
      db_credentials = new OmnihitDBConn({
        client_url: client_url,
        db_conf: {
          DB: '',
          DB_HOST: '',
          DB_USER: '',
          DB_PASS: '',
          DB_PORT: '',
        },
      })
      await db_credentials.save()
      return res.send('ok')
    }
  } catch (error) {
    console.log(error)
  }

  if (db_credentials && db_credentials.db_conf.DB.trim().length > 0) {
    lstPass = lstPass.split(',')
    let password = null

    // password = await lstPass.find(
    //   async (pass) =>
    //     await bcrypt.compare(pass.trim(), db_credentials.db_conf.DB_PASS)
    // )

    for (let i = 0; i < lstPass.length; i++) {
      const hasPass = await bcrypt.compare(
        lstPass[i].trim(),
        db_credentials.db_conf.DB_PASS
      )

      if (hasPass) {
        password = lstPass[i].trim()
        break
      }
    }

    if (password) {
      db_credentials.db_conf.DB_PASS = password
    } else {
      return res.send('ok')
    }
  }

  if (
    db_credentials.db_conf &&
    Object.keys(db_credentials.db_conf).length > 0
  ) {
    const whatsapp_numbers = await new Promise((resolve, reject) => {
      mysql_conn(db_credentials.db_conf).query(
        'SELECT name FROM Whatsapps WHERE name LIKE ?',
        [`%${number}%`],
        (err, result) => {
          if (err) {
            reject(err)
          } else {
            resolve(result)
          }
        }
      )
    })

    console.log('whatsapp_numbers: ', whatsapp_numbers)

    let session_num = []

    if (whatsapp_numbers && whatsapp_numbers.length > 0) {
      console.log('whatsapp_numbers.length: ', whatsapp_numbers.length)

      if (whatsapp_numbers.length == 5) {
        res.status(400).json({
          message: 'Cannot create more than 4 sessions from the same number',
        })
        return
      }

      let regex = /-> [a-zA-Z]\d$/

      let numbered_sessions = whatsapp_numbers.filter((e) => regex.test(e.name))

      console.log('numbered_sessions: ', numbered_sessions)

      session_num = numbered_sessions.map((e) =>
        parseInt(
          e.name
            .split('->')
            [e.name.split('->').length - 1].trim()
            .match(/\d+/)[0]
        )
      )

      console.log('session_num', session_num)
    }

    let index = 1

    while (index <= 4) {
      if (!session_num.includes(index)) {
        console.log(index)
        numberSession = index
        break
      }
      index++
    }
  }

  // numberSession = Math.max(...session_number) + 1

  console.log('Number session: ', numberSession)

  // }

  dirSessionAppName = `${whatsappId}_${number}_${numberSession}_${appPort}`

  destDir = path.join(dirSessionsApp, dirSessionAppName)

  originDir = path.join(__dirname, '..', 'whats')

  copyFolder(originDir, destDir)

  if (
    db_credentials.db_conf &&
    Object.keys(db_credentials.db_conf).length > 0
  ) {
    console.log('***SUCCESS SEED DIRECTORY CREATED***')

    let whatsName

    const whatsapp = await new Promise((resolve, reject) => {
      mysql_conn(db_credentials.db_conf).query(
        'SELECT name from Whatsapps where id = ?',
        [whatsappId],
        (err, result) => {
          if (err) {
            reject(err)
          } else {
            resolve(result)
          }
        }
      )
    })

    if (whatsapp[0]['name'].split('->').length > 0) {
      whatsName = `${whatsapp[0]['name'].split('->')[0]} -> S${numberSession}`
    } else {
      whatsName = `${whatsapp[0]['name']} -> S${numberSession}`
    }

    console.log('whatsName: ', whatsName)

    console.log(
      `url: ${process.env.BASE_URL}:${appPort}\n whatsname: ${whatsName}\n whatsappId: ${whatsappId}`
    )

    await new Promise((resolve, reject) => {
      mysql_conn(db_credentials.db_conf).query(
        'UPDATE Whatsapps SET url = ?, name = ? where id = ?',
        [`${process.env.BASE_URL}:${appPort}`, `${whatsName}`, whatsappId],

        function (err, result) {
          if (err) {
            reject(err)
            console.log('===> ERROR: ' + err)
          } else {
            resolve(result)
            // console.log('RESULT: ', result)
          }
          // else
          //     console.log('myslq result: ', result);
        }
      )
    })

    let whatsappName = `${number} - s${numberSession}`

    console.log('-------------- numberSession', numberSession)

    if (whatsapp.length > 0) {
      if (whatsapp[0]['name'].split(' ').length > 0) {
        whatsappName = `${
          whatsapp[0]['name'].split(' ')[0]
        } - S${numberSession}`
      }
    }

    console.log('whatsapp: ', whatsapp)
    console.log("whatsapp[0]['name']: ", whatsapp[0]['name'])

    const keys = Object.keys(db_credentials.db_conf)

    var stream = fs.createWriteStream(path.join(destDir, '.env'))
    stream.once('open', function (fd) {
      stream.write('# NUMBER AND NAME THAT WILL BE DISPLAYED ON CONSOLE\n')
      stream.write(`MOBILEUID=${number}\n`)
      stream.write(`MOBILENAME=${whatsappName}\n`)
      stream.write('\n')

      stream.write('# PORT NUMBER FOR THIS API\n')
      stream.write(`PORT=${appPort}\n`)
      stream.write('\n')

      stream.write('# URL FROM THE OMNIHIT BACKEND API\n')
      stream.write(`CLIENT_URL=${client_url}\n`)
      stream.write('\n')

      stream.write('# OMNIHIT DATABASE\n')
      keys.forEach((key, index) => {
        stream.write(`${key}=${db_credentials.db_conf[key]}\n`)
      })
      stream.write('\n')

      stream.write(
        `# WHATSAPP ID OF THE TABLE Whatsapps FROM THE OMNIHIT DATABASE\n`
      )
      stream.write(`WHATSAPP_ID=${whatsappId}`)

      stream.end()
    })

    console.log('----------------destDir: ', destDir)

    execSync(`npm install`, { cwd: destDir }, (error, stdout, stderr) => {
      if (error) {
        console.log(`error: ${error.message}`)
        return
      }
      if (stderr) {
        console.log(`stderr: ${stderr}`)
        return
      }
      console.log(`stdout: ${stdout}`)
    })

    startPm2Process(dirSessionAppName, 'app.js', destDir, appPort)
  }

  res.send('OK')
})

app.post('/api/session/edit', async function (req, res) {
  const { app_name, whatsappId, client_url, number } = req.body
})

app.post('/api/session/del', async function (req, res) {
  let { whatsappId, app_name } = req.body

  if (app_name) {
    app_name = app_name.trim()
  }

  const sessionsPath = path.join(__dirname, '..', 'sessions')

  const directoriesInDIrectory = fs
    .readdirSync(sessionsPath, { withFileTypes: true })
    .filter((item) => item.isDirectory())
    .map((item) => item.name)

  console.log('directoriesInDIrectory: ', directoriesInDIrectory)

  const dirExist = directoriesInDIrectory.filter((e) => e.trim() == app_name)

  console.log('dirExist: ', dirExist)

  if (dirExist.length == 0) res.send('ok')

  for (let i = 0; i < directoriesInDIrectory.length; i++) {
    console.log('directoriesInDIrectory[i]', directoriesInDIrectory[i])

    const subDir = fs
      .readdirSync(path.join(sessionsPath, directoriesInDIrectory[i]), {
        withFileTypes: true,
      })
      .filter((item) => item.isDirectory())
      .map((item) => item.name)

    for (let x = 0; x < subDir.length; x++) {
      console.log('subdir: ', subDir[x])

      let whatsId = subDir[x].split('_')[0]

      if (whatsId == whatsappId && app_name == directoriesInDIrectory[i]) {
        let currPath = path.join(
          sessionsPath,
          directoriesInDIrectory[i],
          subDir[x]
        )

        deletePm2Process(subDir[x], currPath)

        console.log('currPath: ', currPath)

        removeDir(currPath)

        return res.send('ok')
      }
    }
  }

  res.send('ok')
})

app.listen(process.env.PORT || 8003, function () {
  console.log(
    '\u26A1[server]: Server is running at Port ::: ' + process.env.PORT || 8003
  )
})

process.on('uncaughtException', function (err) {
  console.error(' ')
  console.error(
    '----- ' + new Date().toUTCString() + ' ----------------------------------'
  )
  console.error('Erro uncaughtException: ', err.message)
  console.error(err.stack)
  console.error(' ')
  return
})

function deletePm2Process(process_name, currPath) {
  pm2.connect(function (err) {
    if (err) {
      console.error(err)
    }

    pm2.list(function (err, processes) {
      if (err) {
        console.error(err)
      }

      processes.forEach(function (process) {
        console.log('.........process.name: ', process.name)

        if (process.name === process_name) {
          execSync(
            `pm2 delete ${process_name} && pm2 save --force`,
            { cwd: currPath },
            (error, stdout, stderr) => {
              if (error) {
                console.log(`error: ${error.message}`)
                return
              }
              if (stderr) {
                console.log(`stderr: ${stderr}`)
                return
              }
              console.log(`stdout: ${stdout}`)
            }
          )
        }
      })

      pm2.disconnect()
    })
  })
}