import {
  PuppetRoomTopicEvent,
  YOU,
}                         from 'wechaty-puppet'

import {
  PadplusMessagePayload,
}                         from '../schemas'

import {
  isPayload,
  isRoomId,
}               from './is-type'

/**
 *
 * 3. Room Topic Event
 *
 */
const ROOM_TOPIC_OTHER_REGEX_LIST = [
  /^"(.+)" changed the group name to "(.+)"$/,
  /^"(.+)"修改群名为“(.+)”$/,
]

const ROOM_TOPIC_YOU_REGEX_LIST = [
  /^(You) changed the group name to "(.+)"$/,
  /^(你)修改群名为“(.+)”$/,
]

export function roomTopicEventMessageParser (
  rawPayload: PadplusMessagePayload,
): null | PuppetRoomTopicEvent {

  if (!isPayload(rawPayload)) {
    return null
  }

  const roomId  = rawPayload.fromUserName
  const content = rawPayload.content
  const timestamp = rawPayload.createTime
  if (!roomId) {
    return null
  }
  if (!isRoomId(roomId)) {
    return null
  }

  let matchesForOther:  null | string[] = []
  let matchesForYou:    null | string[] = []

  ROOM_TOPIC_OTHER_REGEX_LIST.some(regex => !!(matchesForOther = content.match(regex)))
  ROOM_TOPIC_YOU_REGEX_LIST.some(regex => !!(matchesForYou   = content.match(regex)))

  const matches: Array<string | YOU> = matchesForOther || matchesForYou
  if (!matches) {
    return null
  }

  let   changerName = matches[1]
  const topic       = matches[2] as string

  if ((matchesForYou && changerName === '你') || changerName === 'You') {
    changerName = YOU
  }

  const roomTopicEvent: PuppetRoomTopicEvent = {
    changerName,
    roomId,
    timestamp,
    topic,
  }

  return roomTopicEvent
}