const fs = require('fs').promises
const path = require('path')
const configFile = path.join(__dirname, '..', 'config.json')

const defvals = {
  api: {
    host: '0.0.0.0',
    port: 7005,
    mount: '/api'
  },
  rtmp: {
    host: 'icynet.eu:1935',
    mount: '/live',
    key: ''
  },
  control: {
    host: '127.0.0.1',
    port: 7004
  },
  liquidsoap: {
    fallback: '',
    entry: 'liq/view.liq',
    output: {
      bitrate: 2000,
      width: 1280,
      height: 720,
      samplerate: 25
    }
  },
  calendar: {
    googleKey: '',
    calendar: '',
    interval: 60,
    timeFrame: 120000,
    schedule: {
      width: 300,
      height: 400,
      background: 'rgba(0,126,255,0.8)',
      font: 'sans-serif',
      fontColor: '#fff'
    }
  }
}

function getKeys (obj, vals) {
  let keys = {}

  for (let key in obj) {
    if (key === 'calendar') {
      keys['calendar.width'] = vals.calendar.schedule.width
      keys['calendar.height'] = vals.calendar.schedule.height
    } else if (key === 'rtmp') {
      keys['rtmp.url'] = 'rtmp://' + vals.rtmp.host + vals.rtmp.mount
      keys['rtmp.key'] = vals.rtmp.key
    } else if (typeof vals[key] === 'object') {
      let ks = getKeys(obj[key], vals[key])
      for (let i in ks) {
        keys[key + '.' + i] = ks[i]
      }
    } else {
      keys[key] = vals[key]
    }
  }

  return keys
}

class Config {
  constructor () {
    for (let k in defvals) {
      this[k] = defvals[k]
    }
  }

  writeDefault () {
    fs.writeFile(configFile, JSON.stringify(defvals, null, 2)).catch((err) => {
      console.error(err.stack)
      process.exit(1)
    })
  }

  async read () {
    try {
      await fs.stat(configFile)
    } catch (e) {
      return this.writeDefault()
    }

    let conf = await fs.readFile(configFile, 'utf-8')
    let json = JSON.parse(conf)
    let obj = Object.assign({}, defvals, json)

    for (let k in obj) {
      this[k] = obj[k]
    }
  }

  async liq () {
    await this.read()
    return JSON.stringify(getKeys(defvals, this))
  }
}

module.exports = new Config()