const { literal, argument, string, greedyString, DynamicCommandExceptionType } = require('brigadier-commands')
const { createUuidSelector } = require('../util/command/utility')

const UNABLE_TO_SEND_MAIL_ERROR = new DynamicCommandExceptionType(error => new TextMessage([{ text: 'An unexpected error occurred trying to send that message', hoverEvent: { action: 'show_text', contents: error.stack } }]))

module.exports = {
  register (dispatcher) {
    const listNode = literal('list').executes(c => this.listCommand(c)).build()  

    const node = dispatcher.register(
      literal('mail')
        .then(
          literal('send')
            .then(
              argument('username', string())
                .then(
                  argument('message', greedyString())
                    .executes(c => this.sendCommand(c))
                )
            )
        )
        .then(
          listNode
        )
        .then(
          literal('read')
            .executes(c => this.listCommand(c))
            .redirect(listNode)
        )
        .then(
          literal('clear')
            .executes(c => this.clearCommand(c))
        )
    )

    node.description = 'Sends and receives mail from players'
    node.permissionLevel = 0
  },

  async sendCommand (context) {
    const source = context.source
    const bot = source.bot
    const player = source.getPlayerOrThrow()

    const username = context.getArgument('username')
    const message = context.getArgument('message')

    try {
      await bot.sendMail(player.username, username, message)
    } catch (error) {
      bot.console.error(error.stack)
      throw UNABLE_TO_SEND_MAIL_ERROR.create(error)
    }

    bot.tellraw([
      { text: 'Sent ', ...bot.styles.primary },
      { text: message, ...bot.styles.secondary },
      ' to ',
      { text: username, ...bot.styles.secondary }
    ], createUuidSelector(player.uuid))
  },

  listCommand (context) {
    const source = context.source
    const bot = source.bot
    const player = source.getPlayerOrThrow()
    const playerData = bot.playerData[player.uuid]

    const messages = playerData.data?.mail
    if (!messages || !messages.length) {
      bot.tellraw({ text: 'You have no mail', ...bot.styles.primary }, createUuidSelector(player.uuid))
      return
    }

    const msg = [{ text: 'Mail:\n', ...bot.styles.primary }]
    messages.forEach((message) => {
      msg.push(`${message.sender} (from ${message.host}:${message.port}): `)
      msg.push({ text: `${message.message}\n`, ...bot.styles.secondary })
    })
    msg[msg.length - 1].text = msg[msg.length - 1].text.slice(0, -1)

    bot.tellraw(msg, createUuidSelector(player.uuid))

    delete playerData.data.mailUnread
  },

  clearCommand (context) {
    const source = context.source
    const bot = source.bot
    const player = source.getPlayerOrThrow()
    const playerData = bot.playerData[player.uuid]

    delete playerData.data.mail
    bot.tellraw({ text: 'Your mail has been cleared', ...bot.styles.primary }, createUuidSelector(player.uuid))
  }
}