const matrix = require('matrix-js-sdk')
const CommandSource = require('../util/command/command_source')
const htmlStringify = require('../util/chat/stringify/html')

function inject (bot, options) {
  if (!options.matrix?.enabled) return

  bot.matrix = {
    client: options.matrix.client ?? matrix.createClient(options.matrix),
    roomId: options.matrix.roomId,
    commandPrefix: options.matrix.commandPrefix,
    inviteUrl: String(options.matrix.inviteUrl)
  }

  const startTime = Date.now()

  bot.on('chat_html', (html, message) => {
    if (!bot.chat.shouldLog(message)) return
    sendMessage(html)
  })

  const matrixPrefix = {
    text: 'ChipmunkBot Matrix',
    hoverEvent: {
      action: 'show_text',
      contents: 'Click to copy the invite link for the Matrix space to your clipboard!'
    },
    clickEvent: {
      action: 'copy_to_clipboard', // * Minecraft, and Java's URI class in general, seem to hate `#`, so open_url does not work.
      value: bot.matrix.inviteUrl
    }
  }

  bot.matrix.client.on('Room.timeline', (event, room, toStartOfTimeline) => {
    if (event.getRoomId() !== bot.matrix.roomId || event.getType() !== 'm.room.message' || event.getTs() < startTime || event.sender.userId === bot.matrix.client.getUserId() || !bot.loggedIn) return

    const content = event.getContent()
    const permissionLevel = event.sender.powerLevelNorm
    let message = content.body

    const senderText = {
      text: String(event.sender.rawDisplayName || event.sender.name || event.sender.userId),
      hoverEvent: {
        action: 'show_text',
        contents: [String(event.sender.userId), '\nPermission Level: ', String(permissionLevel), '\n\nClick to copy the User ID']
      },
      clickEvent: {
        action: 'copy_to_clipboard',
        value: String(event.sender.userId)
      }
    }

    if (content.url) {
      message = {
        text: '[Attachment]',
        ...bot.styles.primary,
        clickEvent: {
          action: 'open_url',
          value: bot.matrix.client.mxcUrlToHttp(content.url)
        }
      }
    } else if (message.startsWith(bot.matrix.commandPrefix)) {
      const source = new CommandSource({ bot, permissionLevel, sendFeedback, displayName: senderText })
      bot.commands.execute(message.substring(bot.matrix.commandPrefix.length), source)

      return
    }

    bot.fancyMsg(matrixPrefix, senderText, message)
  })

  let dequeuingMessages = false
  let queue = []
  async function sendMessage (html) {
    queue.push(html)
    if (dequeuingMessages) return

    dequeuingMessages = true
    while (queue.length !== 0) {
      const html = queue.join('<br>')
      queue = []
      await _sendMessage(html)
    }
    dequeuingMessages = false
  }

  async function _sendMessage (html) {
    const content = {
      msgtype: 'm.text',
      format: 'org.matrix.custom.html',
      body: html,
      formatted_body: html,
      'm.mentions': {}
    }

    try {
      await bot.matrix.client.sendEvent(bot.matrix.roomId, 'm.room.message', content, '')
    } catch (error) {
      console.error('Unable to send Matrix message:', error)
    }
  }

  function sendFeedback (text, sendFeedback) {
    const html = htmlStringify(text, { lang: bot.registry.language })
    sendMessage(html)
  }
}

module.exports = inject