const WebSocket = require('ws')

const DRAW_VEL = 2.38
const ROOMS = 10
const BASE = 'ws://127.0.0.1:3000/ws?room='

function throwFor(ws, team, broom_x, broom_y, velocity = DRAW_VEL, curl = 0, friction = 1.0) {
  ws.send(JSON.stringify({ type: 'throw', team, broom_x, broom_y, velocity, curl, friction }))
}

function connect(room) {
  return new Promise((resolve, reject) => {
    const ws = new WebSocket(BASE + room)
    const messages = []
    ws.on('open', () => resolve({ ws, messages }))
    ws.on('error', reject)
    ws.on('message', (data) => {
      try {
        messages.push(JSON.parse(data.toString()))
      } catch (_) {}
    })
  })
}

function waitFor(messages, pred, timeout = 20000) {
  const start = Date.now()
  return new Promise((resolve, reject) => {
    const check = () => {
      if (pred()) return resolve(undefined)
      if (Date.now() - start > timeout) {
        const errs = messages.filter(m => m.type === 'error')
        return reject(new Error(
          'timeout types=' + messages.map(m => m.type).join(',') +
          ' errs=' + JSON.stringify(errs)
        ))
      }
      setTimeout(check, 50)
    }
    check()
  })
}

function latestState(messages) {
  for (let i = messages.length - 1; i >= 0; i--) {
    if (messages[i].type === 'game_state') return messages[i]
  }
  return null
}

function remainingSum(st) {
  if (!st || !Array.isArray(st.stones_remaining)) return 16
  return st.stones_remaining[0] + st.stones_remaining[1]
}

async function runRoom(i) {
  const room = `LOAD${i}_${process.hrtime.bigint()}`
  const p1 = await connect(room)
  const p2 = await connect(room)
  await waitFor(p1.messages, () => {
    const st = latestState(p1.messages)
    return st && st.phase === 'playing'
  }, 8000)

  let st = latestState(p1.messages)
  const gsBefore = p1.messages.filter(m => m.type === 'game_state').length
  throwFor(p1.ws, st.turn_team, 0.2, 38.5, DRAW_VEL, 0, 1.0)
  await waitFor(p1.messages, () => p1.messages.some(m => m.type === 'trajectories'), 20000)
  // Must wait for post-throw game_state (remaining decreased), not the pre-throw playing state.
  await waitFor(p1.messages, () => {
    const s = latestState(p1.messages)
    return s && s.phase === 'playing' && remainingSum(s) < 16 &&
      p1.messages.filter(m => m.type === 'game_state').length > gsBefore
  }, 20000)

  st = latestState(p1.messages)
  const trajBefore = p1.messages.filter(m => m.type === 'trajectories').length
  throwFor(p2.ws, st.turn_team, -0.2, 38.5, DRAW_VEL, 0, 1.0)
  await waitFor(p1.messages, () => p1.messages.filter(m => m.type === 'trajectories').length > trajBefore, 20000)

  p1.ws.close()
  p2.ws.close()
}

;(async () => {
  const start = Date.now()
  await Promise.all(Array.from({ length: ROOMS }, (_, i) => runRoom(i)))
  console.log(`10 rooms played start-to-throw-to-close in ${Date.now() - start}ms`)
  process.exit(0)
})().catch((e) => {
  console.error(e)
  process.exit(1)
})