const m = require('mithril')
const client = require('./api/client')

const Encoder = {
  oninit: function(vnode) {
    this.list_devices = {
      command: 'ffmpeg.exe',
      arguments: '-hide_banner -sources decklink',
    }
    this.list_formats = {
      command: '',
      arguments: '<missing decklink device>',
    }
    this.resetStatus()
    client.registerComponent(this)
  },

  resetStatus() {
    this.settingsChanged = false
    this.settings = {
      device: '',
      format_code: '',
      command: '',
    }
    this.encoderStats= null
    this.encoderStatus = {
      starting: false,
      running: false,
      log: '...',
    }
  },

  onremove: function(vnode) {
    client.unregisterComponent(this)
  },

  ioInit: function() {
    client.on(this, 'encoder.status', status => {
      this.encoderStatus = status
      if (!this.settingsChanged) {
        this.settings = status.settings
      }
      this.updateListFormatsHelper()
    })
    client.on(this, 'encoder.stats', stats => {
      this.encoderStats = stats
    })
    client.emit('encoder.status')
  },

  ioConnectionChanged(connected) {
    if (!connected) {
      this.resetStatus()
    } else {
      client.emit('encoder.status')
    }
  },

  listDecklinkDevices() {
    client.emit('encoder.run', this.list_devices)
  },

  listDecklinkFormats() {
    if (!this.settings.device) return

    client.emit('encoder.run', this.list_formats)
  },

  startClicked() {
    client.emit('encoder.start')
  },

  stopClicked() {
    client.emit('encoder.stop')
  },

  saveClicked() {
    this.settingsChanged = false
    client.emit('encoder.settings', this.settings)
  },

  updateListFormatsHelper() {
    if (this.settings.device) {
      this.list_formats.command = this.list_devices.command
      this.list_formats.arguments = `-hide_banner -f decklink -list_formats 1 ${this.settings.device}`
    }
  },

  updateSettings(key, vnode) {
    this.settingsChanged = true
    this.settings[key] = vnode.target.value

    this.updateListFormatsHelper()
  },

  view: function(vnode) {
    let stats = this.encoderStats
    return [
      m('div.column.settings', [
        m('h2', 'Encoder status'),
        m('p', 'Status'),
        m('input', {
          type: 'text',
          readonly: true,
          class: this.encoderStatus.running ? 'red'
                : this.encoderStatus.starting ? 'green' : '',
          value: (!client.isConnected
              ? '<Unknown>'
              : this.encoderStatus.stopError ? `Forcefully stopped: ${this.encoderStatus.stopError}`
              : stats?.errors ? `Streaming: ${stats.errors} Errors`
              : stats?.showSlowSpeed ? `Streaming (Slow speed)`
              : this.encoderStatus.running ? 'Streaming'
              : this.encoderStatus.starting ? 'Starting'
              : 'Not streaming'
            )
            + ' '
            + (stats ? `(fps=${stats.fps} bitrate=${stats.bitrate}kbps speed=${stats.speed % 1 === 0 ? stats.speed : stats.speed.toFixed(3)}x)` : ''),
        }),
        m('.row', [
          m('button.button', {
            hidden: this.encoderStatus.running || this.encoderStatus.starting,
            onclick: this.startClicked.bind(this),
          }, 'Start'),
          m('button.button', {
            hidden: !this.encoderStatus.running && !this.encoderStatus.starting,
            onclick: this.stopClicked.bind(this),
          }, 'Stop'),
        ]),
        // Decklink device section
        m('h2', 'Settings'),
        m('p', [
          'Decklink device, example: ',
          m('span.pre', '-i "DeckLink Mini Recorder"'),
        ]),
        m('div.row', [
          m('input', {
            oncreate: (vnode) => {vnode.dom.setAttribute('spellcheck', 'false')},
            type: 'text',
            autocomplete: 'off',
            value: this.settings.device,
            oninput: this.updateSettings.bind(this, 'device'),
          }),
          m('button.button', {
            onclick: this.listDecklinkDevices.bind(this),
          }, 'List devices'),
        ]),
        m('.row.meta', [
          'Clicking List devices runs ',
          m('.pre', `${this.list_devices.command} ${this.list_devices.arguments}`)
        ]),
        // Decklink format section
        m('p', [
          'Input code, example: ',
          m('span.pre', '-format_code Hi50'),
        ]),
        m('div.row', [
          m('input', {
            oncreate: (vnode) => {vnode.dom.setAttribute('spellcheck', 'false')},
            type: 'text',
            autocomplete: 'off',
            value: this.settings.format_code,
            oninput: this.updateSettings.bind(this, 'format_code'),
          }),
          m('button.button', {
            disabled: !Boolean(this.settings.device),
            onclick: this.listDecklinkFormats.bind(this),
          }, 'List format'),
        ]),
        m('.row.meta', [
          'Clicking List format runs ',
          m('.pre', `${this.list_formats.command} ${this.list_formats.arguments}`)
        ]),
        // Encoding options
        m('p', 'Full encode command'),
        m('textarea', {
          oncreate: (vnode) => {vnode.dom.setAttribute('spellcheck', 'false')},
          value: this.settings.command,
          autocomplete: 'off',
          oninput: this.updateSettings.bind(this, 'command'),
        }),
        m('.row.meta', [
          'Any ',
          m('.pre', 'ffmpeg.exe ... -f decklink ...'),
          'will be replaced with ',
          m('.pre', `ffmpeg.exe ... ${this.settings.format_code} -f decklink ${this.settings.device} ...`),
        ]),
        // Controls
        m('.row', [
          m('button.button', {
            hidden: !this.settingsChanged,
            onclick: this.saveClicked.bind(this),
          }, 'Save'),
        ]),
        m('p', 'Log'),
        m('pre', this.encoderStatus.log || '...'),
      ]),
    ]
  },
}

module.exports = Encoder