{.push raises: [].}

import
  std/[options, strutils, os, sequtils, net],
  chronicles,
  chronos,
  metrics,
  libbacktrace,
  system/ansi_c,
  libp2p/crypto/crypto,
  confutils

import
  waku/[
    common/logging,
    factory/waku,
    factory/external_config,
    node/health_monitor,
    node/waku_metrics,
    waku_api/rest/builder as rest_server_builder,
    waku_lightpush/common,
    waku_filter_v2,
  ],
  ./tester_config,
  ./lightpush_publisher,
  ./filter_subscriber,
  ./diagnose_connections

logScope:
  topics = "liteprotocoltester main"

proc logConfig(conf: LiteProtocolTesterConf) =
  info "Configuration: Lite protocol tester", conf = $conf

{.pop.}
when isMainModule:
  ## Node setup happens in 6 phases:
  ## 1. Set up storage
  ## 2. Initialize node
  ## 3. Mount and initialize configured protocols
  ## 4. Start node and mounted protocols
  ## 5. Start monitoring tools and external interfaces
  ## 6. Setup graceful shutdown hooks

  const versionString = "version / git commit hash: " & waku.git_version

  let confRes = LiteProtocolTesterConf.load(version = versionString)
  if confRes.isErr():
    error "failure while loading the configuration", error = confRes.error
    quit(QuitFailure)

  var conf = confRes.get()

  ## Logging setup
  logging.setupLog(conf.logLevel, conf.logFormat)

  info "Running Lite Protocol Tester node", version = waku.git_version
  logConfig(conf)

  ##Prepare Waku configuration
  ## - load from config file
  ## - override according to tester functionality
  ##

  var wakuConf: WakuNodeConf

  if conf.configFile.isSome():
    try:
      var configFile {.threadvar.}: InputFile
      configFile = conf.configFile.get()
      wakuConf = WakuNodeConf.load(
        version = versionString,
        printUsage = false,
        secondarySources = proc(
            wnconf: WakuNodeConf, sources: auto
        ) {.gcsafe, raises: [ConfigurationError].} =
          echo "Loading secondary configuration file into WakuNodeConf"
          sources.addConfigFile(Toml, configFile),
      )
    except CatchableError:
      error "Loading Waku configuration failed", error = getCurrentExceptionMsg()
      quit(QuitFailure)

  wakuConf.logLevel = conf.logLevel
  wakuConf.logFormat = conf.logFormat
  wakuConf.staticnodes = @[conf.serviceNode]
  wakuConf.nat = conf.nat
  wakuConf.maxConnections = 500
  wakuConf.restAddress = conf.restAddress
  wakuConf.restPort = conf.restPort
  wakuConf.restAllowOrigin = conf.restAllowOrigin

  wakuConf.pubsubTopics = conf.pubsubTopics
  wakuConf.contentTopics = conf.contentTopics
  wakuConf.clusterId = conf.clusterId
  ## TODO: Depending on the tester needs we might extend here with shards, clusterId, etc...

  wakuConf.metricsServer = true
  wakuConf.metricsServerAddress = parseIpAddress("0.0.0.0")
  wakuConf.metricsServerPort = 8003

  if conf.testFunc == TesterFunctionality.SENDER:
    wakuConf.lightpushnode = conf.serviceNode
  else:
    wakuConf.filterNode = conf.serviceNode

  wakuConf.relay = false
  wakuConf.filter = false
  wakuConf.lightpush = false
  wakuConf.store = false

  wakuConf.rest = false

  # NOTE: {.threadvar.} is used to make the global variable GC safe for the closure uses it
  # It will always be called from main thread anyway.
  # Ref: https://nim-lang.org/docs/manual.html#threads-gc-safety
  var nodeHealthMonitor {.threadvar.}: WakuNodeHealthMonitor
  nodeHealthMonitor = WakuNodeHealthMonitor()
  nodeHealthMonitor.setOverallHealth(HealthStatus.INITIALIZING)

  let restServer = rest_server_builder.startRestServerEsentials(
    nodeHealthMonitor, wakuConf
  ).valueOr:
    error "Starting esential REST server failed.", error = $error
    quit(QuitFailure)

  var wakuApp = Waku.init(wakuConf).valueOr:
    error "Waku initialization failed", error = error
    quit(QuitFailure)

  wakuApp.restServer = restServer

  nodeHealthMonitor.setNode(wakuApp.node)

  (waitFor startWaku(addr wakuApp)).isOkOr:
    error "Starting waku failed", error = error
    quit(QuitFailure)

  rest_server_builder.startRestServerProtocolSupport(
    restServer, wakuApp.node, wakuApp.wakuDiscv5, wakuConf
  ).isOkOr:
    error "Starting protocols support REST server failed.", error = $error
    quit(QuitFailure)

  wakuApp.metricsServer = waku_metrics.startMetricsServerAndLogging(wakuConf).valueOr:
    error "Starting monitoring and external interfaces failed", error = error
    quit(QuitFailure)

  nodeHealthMonitor.setOverallHealth(HealthStatus.READY)

  debug "Setting up shutdown hooks"
  ## Setup shutdown hooks for this process.
  ## Stop node gracefully on shutdown.

  proc asyncStopper(wakuApp: Waku) {.async: (raises: [Exception]).} =
    nodeHealthMonitor.setOverallHealth(HealthStatus.SHUTTING_DOWN)
    await wakuApp.stop()
    quit(QuitSuccess)

  # Handle Ctrl-C SIGINT
  proc handleCtrlC() {.noconv.} =
    when defined(windows):
      # workaround for https://github.com/nim-lang/Nim/issues/4057
      setupForeignThreadGc()
    notice "Shutting down after receiving SIGINT"
    asyncSpawn asyncStopper(wakuApp)

  setControlCHook(handleCtrlC)

  # Handle SIGTERM
  when defined(posix):
    proc handleSigterm(signal: cint) {.noconv.} =
      notice "Shutting down after receiving SIGTERM"
      asyncSpawn asyncStopper(wakuApp)

    c_signal(ansi_c.SIGTERM, handleSigterm)

  # Handle SIGSEGV
  when defined(posix):
    proc handleSigsegv(signal: cint) {.noconv.} =
      # Require --debugger:native
      fatal "Shutting down after receiving SIGSEGV", stacktrace = getBacktrace()

      # Not available in -d:release mode
      writeStackTrace()

      waitFor wakuApp.stop()
      quit(QuitFailure)

    c_signal(ansi_c.SIGSEGV, handleSigsegv)

  info "Node setup complete"

  if conf.testFunc == TesterFunctionality.SENDER:
    waitFor startPeriodicPeerDiagnostic(wakuApp.node.peerManager, WakuLightPushCodec)
    setupAndPublish(wakuApp.node, conf)
  else:
    waitFor startPeriodicPeerDiagnostic(
      wakuApp.node.peerManager, WakuFilterSubscribeCodec
    )
    setupAndSubscribe(wakuApp.node, conf)

  runForever()