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

 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/>.

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

const hr =
  '---------------------------------------------------------------------------------'

module.exports = {
  GetDateString: GetDateString,
  Log: Log,
  DebugLog: DebugLog,
  GetColor: GetColor,
  LogReq: LogReq,
  LogStat: LogStat,
  Load: Load,
  logHashed: logHashed,
  hr: hr,
  C: C,
  setNewLogfileName,
}

const DELIM = C('green') + '|' + C()

const utils = require('../utils/utils.js')
const vlogDir = './stats/vlogs/'
const logDir = './stats/logs/'
const statFile = 'stats/stats'
const vStatFile = 'stats/vstats'
const uStatsFile = 'stats/ustats'
const uvStatsFile = 'stats/uvstats'
const nologFile = './nolog'

const colors = ['green', 'red', 'yellow', 'blue', 'magenta', 'cyan']
var logFileName = utils.GetDateString(true)

const writeInterval = 10
const debugLevel = parseInt(process.env.NS_LOGLEVEL) || 0

let data = {} // visit data
let vData = {} // visit data, but daily
let uData = {} // visit data, but per user
let uvData = {} // visit data, but per user and daily
let writes = 0

let noLogips = []

function setNewLogfileName() {
  logFileName = utils.GetDateString(true)
}

function GetDateString() {
  const date = new Date()
  const dateString = utils.GetDateString()
  return GetRandomColor(date.getHours().toString()) + dateString + C()
}

function DebugLog(msg, name, lvl) {
  if (lvl <= debugLevel) {
    if (msg === 'hr') {
      msg = hr
    }
    let s = msg
    let header = `${C('red')}#DEBUG${lvl}#${C(
      'yellow'
    )}${name.toUpperCase()}${C('red')}#${C()}${DELIM}${C()}`
    if (typeof msg !== 'object') {
      s = header + msg
    } else {
      Log(header + 'OBJECT:', 'yellow')
      s = msg
    }
    Log(s, 'yellow')
  }
}

function Log(s, c) {
  let log = s
  if (typeof s !== 'object') {
    let dl = DELIM + C(c)
    log = C(c) + GetDateString() + dl + s + C()
  }

  console.log(log)
  utils.AppendToFile(log, logDir + logFileName)
}

function LogReq(req, toFile, sc) {
  try {
    let ip = req.headers['cf-connecting-ip'] || req.connection.remoteAddress

    let nolog = noLogips.some((x) => {
      return ip.includes(x)
    })
    if (nolog) {
      return
    }

    let logEntry = GetRandomColor(ip) + ip + C()
    let dl = DELIM
    if (req.url.includes('lred')) {
      dl += C('red')
    }

    let hostname
    if (req.hostname) {
      hostname = req.hostname.replace('www.', '').split('.')[0]
    } else {
      hostname = 'NOHOST'
      Log(
        'req.hostname is undefined! req.hostname: ' + req.hostname,
        GetColor('redbg')
      )
    }
    logEntry +=
      dl + hostname + dl + req.headers['user-agent'] + dl + req.method + dl

    if (req.session && req.session.user) {
      logEntry += C('cyan') + req.session.user.id + C() + dl
    } else if (req.session && req.session.isException === true) {
      logEntry += C('cyan') + 'EX' + C() + dl
    } else {
      logEntry += C('red') + 'NOUSER' + C() + dl
    }

    logEntry += GetRandomColor(req.url.split('?')[0]) + req.url

    if (sc !== undefined) {
      logEntry += dl + sc
    }

    logEntry += C()
    if (!toFile) {
      Log(logEntry)
    } else {
      let defLogs = GetDateString() + dl + logEntry

      utils.AppendToFile(defLogs, vlogDir + logFileName)
    }
  } catch (err) {
    console.log(err)
    Log('Error at logging lol', GetColor('redbg'), true)
  }
}

function parseNoLogFile(newData) {
  noLogips = newData.split('\n')
  if (noLogips[noLogips.length - 1] === '') {
    noLogips.pop()
  }
  noLogips = noLogips.filter((x) => {
    return x !== ''
  })
  Log('\tNo Log IP-s changed: ' + noLogips.join(', '))
}

function setNoLogReadInterval() {
  utils.WatchFile(nologFile, (newData) => {
    parseNoLogFile(newData)
  })

  parseNoLogFile(utils.ReadFile(nologFile))
}

function Load() {
  Log('Loading logger...')
  try {
    uData = JSON.parse(utils.ReadFile(uStatsFile))
  } catch (e) {
    Log('Error at loading logs! (@ first run its normal)', GetColor('redbg'))
    console.log(e)
  }

  try {
    uvData = JSON.parse(utils.ReadFile(uvStatsFile))
  } catch (e) {
    Log('Error at loading logs! (@ first run its normal)', GetColor('redbg'))
    console.log(e)
  }

  try {
    var prevData = utils.ReadFile(statFile)
    data = JSON.parse(prevData)
  } catch (e) {
    Log('Error at loading logs! (@ first run its normal)', GetColor('redbg'))
    console.log(e)
  }

  try {
    var prevVData = utils.ReadFile(vStatFile)
    vData = JSON.parse(prevVData)
  } catch (e) {
    Log(
      'Error at loading visit logs! (@ first run its normal)',
      GetColor('redbg')
    )
    console.log(e)
  }
  setNoLogReadInterval()
}

function LogStat(url, ip, hostname, userId) {
  let nolog = noLogips.some((x) => {
    return x.includes(ip)
  })
  if (nolog) {
    return
  }

  url = hostname + url.split('?')[0]
  Inc(url)
  AddUserIdStat(userId)
  IncUserStat(userId)
  AddVisitStat(url)
  Save()
}

function IncUserStat(userId) {
  try {
    if (uData[userId] === undefined) {
      uData[userId] = 0
    }
    uData[userId]++
  } catch (e) {
    Log('Error at making user ID stats!', GetColor('redbg'))
    console.error(e)
  }
}

function AddUserIdStat(userId) {
  try {
    var m = new Date()
    const now =
      m.getFullYear() +
      '-' +
      ('0' + (m.getMonth() + 1)).slice(-2) +
      '-' +
      ('0' + m.getDate()).slice(-2)
    if (uvData[now] === undefined) {
      uvData[now] = {}
    }
    if (uvData[now][userId] === undefined) {
      uvData[now][userId] = 0
    }
    uvData[now][userId]++
  } catch (e) {
    Log('Error at making user ID stats!', GetColor('redbg'))
    console.error(e)
  }
}

function Inc(value) {
  if (value.startsWith('/?')) {
    value = '/'
  }
  if (data[value] === undefined) {
    data[value] = 0
  }
  data[value]++
}

function AddVisitStat(name) {
  var m = new Date()
  const now =
    m.getFullYear() +
    '-' +
    ('0' + (m.getMonth() + 1)).slice(-2) +
    '-' +
    ('0' + m.getDate()).slice(-2)
  if (vData[now] === undefined) {
    vData[now] = {}
  }
  if (vData[now][name] === undefined) {
    vData[now][name] = 0
  }
  vData[now][name]++
}

function Save() {
  writes++
  if (writes === writeInterval) {
    try {
      utils.WriteFile(JSON.stringify(uData), uStatsFile)
    } catch (e) {
      Log('Error at writing logs! (more in stderr)', GetColor('redbg'))
      console.error(e)
    }
    try {
      utils.WriteFile(JSON.stringify(uvData), uvStatsFile)
    } catch (e) {
      Log('Error at writing logs! (more in stderr)', GetColor('redbg'))
      console.error(e)
    }
    try {
      utils.WriteFile(JSON.stringify(data), statFile)
      // Log("Stats wrote.");
    } catch (e) {
      Log('Error at writing logs! (more in stderr)', GetColor('redbg'))
      console.error(e)
    }
    try {
      utils.WriteFile(JSON.stringify(vData), vStatFile)
      // Log("Stats wrote.");
    } catch (e) {
      Log('Error at writing visit logs! (more in stderr)', GetColor('redbg'))
      console.error(e)
    }
    writes = 0
  }
}

function logHashed(x) {
  return GetRandomColor(x.toString()) + x + C()
}

function GetRandomColor(ip) {
  if (!ip) {
    return 'red'
  }

  let res = ip.split('').reduce((res, x) => {
    return res + x.charCodeAt(0)
  }, 0)
  return C(colors[res % colors.length])
}

function GetColor(c) {
  return c
}

function C(c) {
  if (c !== undefined) {
    c = c.toLowerCase()
  }

  if (c === 'redbg') {
    return '\x1b[41m'
  }
  if (c === 'bluebg') {
    return '\x1b[44m'
  }
  if (c === 'green') {
    return '\x1b[32m'
  }
  if (c === 'red') {
    return '\x1b[31m'
  }
  if (c === 'yellow') {
    return '\x1b[33m'
  }
  if (c === 'blue') {
    return '\x1b[34m'
  }
  if (c === 'magenta') {
    return '\x1b[35m'
  }
  if (c === 'cyan') {
    return '\x1b[36m'
  }
  return '\x1b[0m'
}