/**
 * Integration: TCP + Protomux chat channel — verifies Protomux wiring + ingest when
 * socket.publicKey / remotePublicKey match the Hyperswarm Noise identity pattern.
 */
import test from 'brittle'
import net from 'net'
import Protomux from 'protomux'
import b4a from 'b4a'
import crypto from 'hypercore-crypto'
import { SwarmDisk } from './lib/swarm-disk.js'
import { createBareOsChatService } from './lib/bare-os-chat-service.js'

/** @returns {Promise<{ srvSock: net.Socket, cliSock: net.Socket }>} */
function tcpDuplexPair() {
  return new Promise((resolve, reject) => {
    const srv = net.createServer()
    srv.once('error', reject)
    srv.listen(0, '127.0.0.1', () => {
      const addr = srv.address()
      if (!addr || typeof addr === 'string') {
        reject(new Error('tcpDuplexPair: bad address'))
        return
      }
      const cliSock = net.connect(addr.port, '127.0.0.1')
      srv.once('connection', (srvSock) => {
        srv.close(() => {})
        resolve({ srvSock, cliSock })
      })
      cliSock.once('error', reject)
    })
  })
}

function wireNoiseLikeKeys(sockLocal, kpLocal, kpRemote) {
  sockLocal.publicKey = kpLocal.publicKey
  sockLocal.remotePublicKey = kpRemote.publicKey
}

test('TCP + Protomux — chat event roundtrips Alice → Bob', async (t) => {
  process.env.BARE_OS_PROTOMUX_CHAT_CHANNEL = '1'

  const kpAlice = crypto.keyPair()
  const kpBob = crypto.keyPair()

  const { srvSock, cliSock } = await tcpDuplexPair()

  wireNoiseLikeKeys(cliSock, kpAlice, kpBob)
  wireNoiseLikeKeys(srvSock, kpBob, kpAlice)

  const diskAlice = new SwarmDisk()
  diskAlice.localNoiseWirePk = b4a.from(kpAlice.publicKey)

  const diskBob = new SwarmDisk()

  diskAlice.bareOsChatService = createBareOsChatService({
    env: /** @type {Record<string, string>} */ ({ USER: 'aliceuser' })
  })
  diskBob.bareOsChatService = createBareOsChatService({
    env: /** @type {Record<string, string>} */ ({ USER: 'bobuser' })
  })

  const muxAlice = new Protomux(cliSock)
  const muxBob = new Protomux(srvSock)

  const peerAliceToBob = {
    chan: /** @type {unknown} */ (null),
    mux: muxAlice,
    socket: cliSock,
    id: null,
    chatChan: null
  }

  const peerBobFromAlice = {
    chan: /** @type {unknown} */ (null),
    mux: muxBob,
    socket: srvSock,
    id: null,
    chatChan: null
  }

  diskAlice.bareOsChatService.pairOnMux(
    diskAlice,
    muxAlice,
    cliSock,
    peerAliceToBob
  )
  diskBob.bareOsChatService.pairOnMux(
    diskBob,
    muxBob,
    srvSock,
    peerBobFromAlice
  )

  diskAlice.peers.add(peerAliceToBob)
  diskBob.peers.add(peerBobFromAlice)

  await new Promise((r) => setImmediate(r))
  await new Promise((r) => setImmediate(r))

  /** @type {unknown[]} */
  const bobRx = []
  diskBob.bareOsChatService.subscribe((ev) => bobRx.push(ev))

  diskAlice.bareOsChatService.broadcastLocal(diskAlice, 'hello-from-tcp', {
    displayName: 'aliceuser'
  })

  await new Promise((r) => setImmediate(r))
  await new Promise((r) => setImmediate(r))

  t.ok(bobRx.length >= 1, 'Bob received remote event')
  const last = /** @type {{ body?: string, local?: boolean }} */ (bobRx[bobRx.length - 1])
  t.is(last.body, 'hello-from-tcp')
  t.absent(last.local)

  srvSock.destroy()
  cliSock.destroy()
})

test('pairBareOsChatExistingPeers wires chat after peers already on disk', async (t) => {
  process.env.BARE_OS_PROTOMUX_CHAT_CHANNEL = '1'

  const kpAlice = crypto.keyPair()
  const kpBob = crypto.keyPair()

  const { srvSock, cliSock } = await tcpDuplexPair()

  wireNoiseLikeKeys(cliSock, kpAlice, kpBob)
  wireNoiseLikeKeys(srvSock, kpBob, kpAlice)

  const diskAlice = new SwarmDisk()
  diskAlice.localNoiseWirePk = b4a.from(kpAlice.publicKey)

  const diskBob = new SwarmDisk()

  diskAlice.bareOsChatService = createBareOsChatService({
    env: /** @type {Record<string, string>} */ ({ USER: 'aliceuser' })
  })
  diskBob.bareOsChatService = createBareOsChatService({
    env: /** @type {Record<string, string>} */ ({ USER: 'bobuser' })
  })

  const muxAlice = new Protomux(cliSock)
  const muxBob = new Protomux(srvSock)

  const peerAliceToBob = {
    chan: /** @type {unknown} */ (null),
    mux: muxAlice,
    socket: cliSock,
    id: null,
    chatChan: null
  }

  const peerBobFromAlice = {
    chan: /** @type {unknown} */ (null),
    mux: muxBob,
    socket: srvSock,
    id: null,
    chatChan: null
  }

  diskAlice.peers.add(peerAliceToBob)
  diskBob.peers.add(peerBobFromAlice)

  diskAlice.pairBareOsChatExistingPeers()
  diskBob.pairBareOsChatExistingPeers()

  await new Promise((r) => setImmediate(r))
  await new Promise((r) => setImmediate(r))

  /** @type {unknown[]} */
  const bobRx = []
  diskBob.bareOsChatService.subscribe((ev) => bobRx.push(ev))

  diskAlice.bareOsChatService.broadcastLocal(diskAlice, 'hello-after-late-pair', {
    displayName: 'aliceuser'
  })

  await new Promise((r) => setImmediate(r))
  await new Promise((r) => setImmediate(r))

  t.ok(bobRx.length >= 1, 'Bob received remote event')
  const last = /** @type {{ body?: string, local?: boolean }} */ (bobRx[bobRx.length - 1])
  t.is(last.body, 'hello-after-late-pair')
  t.absent(last.local)

  srvSock.destroy()
  cliSock.destroy()
})