const WebSocket = require('ws')

const DRAW_VEL = 2.38
const room = 'MULTI' + Math.floor(Math.random() * 1000)
const base = 'ws://127.0.0.1:3000/ws?room=' + 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(name) {
  return new Promise((resolve, reject) => {
    const ws = new WebSocket(base)
    const messages = []
    ws.on('message', (data) => {
      const msg = JSON.parse(data.toString())
      messages.push(msg)
      console.log(`[${name}]`, msg.type)
      if (msg.type === 'joined') {
        resolve({ ws, messages })
      }
    })
    ws.on('open', () => console.log(`[${name}] open`))
    ws.on('error', (e) => { console.error(`[${name}] error`, e.message); reject(e) })
    ws.on('close', (code) => console.log(`[${name}] close`, code))
  })
}

function waitFor(client, pred, timeout = 10000) {
  const start = Date.now()
  return new Promise((resolve, reject) => {
    const check = () => {
      if (pred(client.messages)) return resolve(undefined)
      if (Date.now() - start > timeout) return reject(new Error('timeout'))
      setTimeout(check, 50)
    }
    check()
  })
}

;(async () => {
  // 3 clients join the same room
  const p1 = await connect('p1')
  const p2 = await connect('p2')
  const p3 = await connect('p3')

  // All 3 receive game_state after join
  await waitFor(p1, msgs => msgs.some(m => m.type === 'game_state'), 5000)
  await waitFor(p2, msgs => msgs.some(m => m.type === 'game_state'), 5000)
  await waitFor(p3, msgs => msgs.some(m => m.type === 'game_state'), 5000)
  console.log('All 3 clients received game_state')

  // p1 throws for the current turn_team
  const state = p1.messages.find(m => m.type === 'game_state')
  const turn = state.turn_team
  console.log(`p1 throwing for team ${turn}`)
  throwFor(p1.ws, turn, 0.0, 38.5, DRAW_VEL, 0, 1.0)

  // All 3 clients eventually see trajectories (plural) or updated game_state
  await waitFor(p1, msgs => msgs.some(m => m.type === 'trajectories'), 15000)
  await waitFor(p2, msgs => msgs.some(m => m.type === 'trajectories'), 15000)
  await waitFor(p3, msgs => msgs.some(m => m.type === 'trajectories'), 15000)
  console.log('All 3 clients received trajectories')

  // All 3 see an updated game_state after the throw
  await waitFor(p1, msgs => msgs.slice(-1)[0]?.type === 'game_state', 15000)
  await waitFor(p2, msgs => msgs.slice(-1)[0]?.type === 'game_state', 15000)
  await waitFor(p3, msgs => msgs.slice(-1)[0]?.type === 'game_state', 15000)
  console.log('All 3 clients received updated game_state after throw')

  console.log('Multi-client observer test passed')
  p1.ws.close()
  p2.ws.close()
  p3.ws.close()
  process.exit(0)
})().catch(err => {
  console.error(err)
  process.exit(1)
})