import assert from 'node:assert/strict'
import { io } from 'socket.io-client'

const SOCKET_SERVER_PORT = process.env.SOCKET_SERVER_PORT || '31873'
const SOCKET_SERVER_URL = `http://127.0.0.1:${SOCKET_SERVER_PORT}`

/**
 * 테스트에 사용할 유효한 50장 덱 URL을 만든다.
 *
 * @returns {string} 덱 등록용 결과 페이지 URL
 */
function createValidDeckUrl() {
  const cards = Array.from({ length: 13 }, (_, cardIndex) => ({
    imgSrc: `/ua01/TEST-${String(cardIndex + 1).padStart(3, '0')}.png`,
    Number: `TEST-${String(cardIndex + 1).padStart(3, '0')}`,
    count: cardIndex === 12 ? 2 : 4,
    color: 'Blue',
    trigger: null,
  }))
  const deckUrl = new URL('http://uniare.sori.studio/result.html')

  deckUrl.searchParams.set('series', 'ua01')
  deckUrl.searchParams.set('seriesName', 'Code Geass')
  deckUrl.searchParams.set('cards', JSON.stringify(cards))

  return deckUrl.toString()
}

/**
 * 연결 완료 또는 오류를 Promise로 기다린다.
 *
 * @param {import('socket.io-client').Socket} socket 확인할 클라이언트 소켓
 * @returns {Promise<void>} 연결 완료 Promise
 */
function waitForConnection(socket) {
  return new Promise((resolve, reject) => {
    socket.once('connect', resolve)
    socket.once('connect_error', reject)
  })
}

/**
 * Socket.IO 승인 응답이 있는 이벤트를 전송한다.
 *
 * @param {import('socket.io-client').Socket} socket 이벤트를 전송할 소켓
 * @param {string} eventName 이벤트 이름
 * @param {unknown[]} eventArguments 이벤트 인자
 * @returns {Promise<object>} 서버 승인 응답
 */
function emitWithAcknowledgement(socket, eventName, ...eventArguments) {
  return new Promise((resolve, reject) => {
    socket.timeout(3000).emit(
      eventName,
      ...eventArguments,
      (timeoutError, response) => {
        if (timeoutError) {
          reject(timeoutError)
          return
        }

        resolve(response)
      },
    )
  })
}

/**
 * 게임 시작 이벤트를 한 번 기다린다.
 *
 * @param {import('socket.io-client').Socket} socket 이벤트를 기다릴 소켓
 * @returns {Promise<object>} 게임 시작 정보
 */
function waitForGameStart(socket) {
  return new Promise((resolve) => {
    socket.once('game:started', resolve)
  })
}

/**
 * 두 클라이언트의 방 생성부터 게임 시작까지 검증한다.
 *
 * @returns {Promise<void>} 검증 완료 Promise
 */
async function runIntegrationTest() {
  const firstPlayerSocket = io(SOCKET_SERVER_URL, {
    path: '/socket.io',
    transports: ['websocket', 'polling'],
  })
  const secondPlayerSocket = io(SOCKET_SERVER_URL, {
    path: '/socket.io',
    transports: ['websocket', 'polling'],
  })

  try {
    await Promise.all([
      waitForConnection(firstPlayerSocket),
      waitForConnection(secondPlayerSocket),
    ])

    const createRoomResponse = await emitWithAcknowledgement(
      firstPlayerSocket,
      'room:create',
    )
    assert.equal(createRoomResponse.ok, true)
    assert.equal(createRoomResponse.room.players.length, 1)

    const joinRoomResponse = await emitWithAcknowledgement(
      secondPlayerSocket,
      'room:join',
      createRoomResponse.room.roomCode,
    )
    assert.equal(joinRoomResponse.ok, true)
    assert.equal(joinRoomResponse.room.players.length, 2)

    const validDeckUrl = createValidDeckUrl()
    const firstDeckResponse = await emitWithAcknowledgement(
      firstPlayerSocket,
      'player:register-deck',
      validDeckUrl,
    )
    const secondDeckResponse = await emitWithAcknowledgement(
      secondPlayerSocket,
      'player:register-deck',
      validDeckUrl,
    )
    assert.equal(firstDeckResponse.ok, true)
    assert.equal(secondDeckResponse.ok, true)

    const firstGameStart = waitForGameStart(firstPlayerSocket)
    const secondGameStart = waitForGameStart(secondPlayerSocket)

    await emitWithAcknowledgement(
      firstPlayerSocket,
      'player:set-ready',
      true,
    )
    await emitWithAcknowledgement(
      secondPlayerSocket,
      'player:set-ready',
      true,
    )

    const [firstStartPayload, secondStartPayload] = await Promise.all([
      firstGameStart,
      secondGameStart,
    ])

    assert.equal(firstStartPayload.seat, 'player-one')
    assert.equal(secondStartPayload.seat, 'player-two')
    assert.equal(firstStartPayload.roomCode, secondStartPayload.roomCode)
    assert.match(firstStartPayload.gameQuery, /series=ua01/)

    console.log('Socket.IO 2인 방 통합 테스트를 통과했습니다.')
  } finally {
    firstPlayerSocket.disconnect()
    secondPlayerSocket.disconnect()
  }
}

await runIntegrationTest()