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

 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 =
  '---------------------------------------------------------------------------------'

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

// import express from 'express'
import utils from '../utils/utils'
import { Request } from '../types/basicTypes'

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 = './data/nolog'

const colors = ['green', 'red', 'yellow', 'blue', 'magenta', 'cyan']
const logFileName = 'log'

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

// let vdata = {} // visit data
// let dvData = {} // visit data, but daily
// let uData = {} // visit data, but per user
// let udvData = {} // visit data, but per user and daily

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

let noLogIds: string[] = []

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

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

function Log(msg: string | object, color?: string): void {
  let log = msg
  if (typeof msg !== 'object') {
    const delimiter = DELIM + C(color)
    log = getColoredDateString() + delimiter + C(color) + msg + C()
  }

  if (!process.env.NS_NOLOG) {
    console.log(log)
  }
  utils.AppendToFile(
    typeof log === 'string' ? log : JSON.stringify(log),
    logDir + logFileName
  )
}

function expandWithSpaces(text: string, count: number) {
  while (text.length < count) {
    text += ' '
  }
  return text
}

function LogReq(
  req: Request,
  toFile?: boolean,
  statusCode?: string | number
): void {
  try {
    let logEntry = '' // logHashed(ip)
    let dl = DELIM
    if (req.url.includes('lred')) {
      dl += C('red')
    }
    if (!shouldLog(req.session.user.id, noLogIds)) {
      return
    }

    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')
      )
    }
    if (!toFile) {
      hostname = expandWithSpaces(hostname, 10)
    }

    logEntry += logHashed(hostname) + dl
    if (toFile) {
      logEntry += req.headers['user-agent'] + dl
      logEntry += req.method + dl
    }

    let uid = ''
    if (req.session && req.session.user) {
      uid = req.session.user.id.toString()
    } else if (req.session && req.session.isException === true) {
      uid = 'EX'
    } else {
      uid = 'NOUSR'
    }
    if (!toFile) {
      uid = expandWithSpaces(uid, 5)
    }
    logEntry += GetRandomColor(uid.toString()) + uid + C() + dl

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

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

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

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

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

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

  parseNoLogFile(utils.ReadFile(nologFile))
}

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

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

  try {
    vData = utils.ReadJSON(statFile)
  } catch (err) {
    Log('Error at loading logs! (@ first run its normal)', GetColor('redbg'))
    console.error(err)
  }

  try {
    dvData = utils.ReadJSON(vStatFile)
  } catch (err) {
    Log(
      'Error at loading visit logs! (@ first run its normal)',
      GetColor('redbg')
    )
    console.error(err)
  }
  setNoLogReadInterval()
}

export function shouldLog(userId: string | number, nolog: string[]): boolean {
  return nolog.some((noLogId) => {
    return noLogId === userId.toString()
  })
}

function LogStat(url: string, hostname: string, userId: number | string): void {
  const nolog = shouldLog(userId, noLogIds)
  if (nolog) {
    return
  }

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

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

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

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

function AddVisitStat(name: string) {
  const date = new Date()
  const now =
    date.getFullYear() +
    '-' +
    ('0' + (date.getMonth() + 1)).slice(-2) +
    '-' +
    ('0' + date.getDate()).slice(-2)
  if (dvData[now] === undefined) {
    dvData[now] = {}
  }
  if (dvData[now][name] === undefined) {
    dvData[now][name] = 0
  }
  dvData[now][name]++
}

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

function logHashed(msg: string): string {
  return GetRandomColor(msg.toString()) + msg + C()
}

function GetRandomColor(msg: string): string {
  if (!msg) {
    return 'red'
  }

  const res = msg.split('').reduce((res, character) => {
    return res + character.charCodeAt(0)
  }, 0)
  return C(colors[res % colors.length])
}

function GetColor(color: string): string {
  return color
}

function C(color?: string): string {
  if (color !== undefined) {
    color = color.toLowerCase()
  }

  if (color === 'redbg') {
    return '\x1b[41m'
  }
  if (color === 'bluebg') {
    return '\x1b[44m'
  }
  if (color === 'cyanbg') {
    return '\x1b[46m'
  }
  if (color === 'green') {
    return '\x1b[32m'
  }
  if (color === 'red') {
    return '\x1b[31m'
  }
  if (color === 'yellow') {
    return '\x1b[33m'
  }
  if (color === 'blue') {
    return '\x1b[34m'
  }
  if (color === 'magenta') {
    return '\x1b[35m'
  }
  if (color === 'cyan') {
    return '\x1b[36m'
  }
  return '\x1b[0m'
}

export default {
  getColoredDateString: getColoredDateString,
  Log: Log,
  DebugLog: DebugLog,
  GetColor: GetColor,
  LogReq: LogReq,
  LogStat: LogStat,
  Load: Load,
  logHashed: logHashed,
  hr: hr,
  C: C,
  logFileName: logFileName,
  logDir: logDir,
  vlogDir: vlogDir,
}