#if os(iOS) || os(tvOS)
  import Flutter
#elseif os(macOS)
  import FlutterMacOS
#endif

/// Protocol for shared MpvPlayerPlugin method handlers across iOS, tvOS, and macOS.
/// Platform-specific methods (PiP, initialization, window finding) remain
/// in the per-platform MpvPlayerPlugin files.
protocol MpvPluginShared: AnyObject, MpvPlayerDelegate {
  var coreBase: MpvPlayerCoreBase? { get }
  var eventSink: FlutterEventSink? { get }
  var nameToId: [String: Int] { get set }

  func setPlayerVisible(_ visible: Bool, restoreOnWindowVisible: Bool)
  func updatePlayerFrame()

  /// Invoked after the `pause` property is applied via setProperty so each
  /// platform can sync its PiP/idle bookkeeping (iOS: invalidate the PiP
  /// playback state + timebase; macOS: setPlaying/setPaused).
  func didSetPauseProperty(value: String)
}

extension MpvPluginShared {

  func handleSetProperty(call: FlutterMethodCall, result: @escaping FlutterResult) {
    guard let args = call.arguments as? [String: Any],
      let name = args["name"] as? String,
      let value = args["value"] as? String
    else {
      result(
        FlutterError(
          code: "INVALID_ARGS", message: "Missing 'name' or 'value' argument",
          details: nil))
      return
    }

    guard let core = coreBase else {
      result(
        FlutterError(
          code: "NOT_INITIALIZED", message: "MPV player is not initialized", details: nil))
      return
    }

    core.setPropertyAsync(name, value: value) { [weak self] propertyResult in
      switch propertyResult {
      case .success:
        if name == "pause" {
          self?.didSetPauseProperty(value: value)
        }
        result(nil)
      case .failure(let error):
        let lifecycleUnavailable = error is MpvLifecycleUnavailableError
        result(
          FlutterError(
            code: lifecycleUnavailable ? "NOT_INITIALIZED" : "SET_PROPERTY_FAILED",
            message:
              lifecycleUnavailable
              ? "MPV player is not initialized"
              : "MPV rejected or cancelled the property write",
            details: nil))
      }
    }
  }

  func handleGetProperty(call: FlutterMethodCall, result: @escaping FlutterResult) {
    guard let args = call.arguments as? [String: Any],
      let name = args["name"] as? String
    else {
      result(
        FlutterError(code: "INVALID_ARGS", message: "Missing 'name' argument", details: nil)
      )
      return
    }
    coreBase?.getPropertyAsync(name) { propertyResult in
      switch propertyResult {
      case .success(let value):
        result(value)
      case .failure:
        result(nil)
      }
    } ?? result(nil)
  }

  func handleObserveProperty(call: FlutterMethodCall, result: @escaping FlutterResult) {
    guard let args = call.arguments as? [String: Any],
      let name = args["name"] as? String,
      let format = args["format"] as? String,
      let id = args["id"] as? Int
    else {
      result(
        FlutterError(
          code: "INVALID_ARGS", message: "Missing 'name', 'format', or 'id' argument",
          details: nil))
      return
    }

    nameToId[name] = id
    coreBase?.observeProperty(name, format: format)
    result(nil)
  }

  func handleCommand(call: FlutterMethodCall, result: @escaping FlutterResult) {
    guard let args = call.arguments as? [String: Any],
      let commandArgs = args["args"] as? [String]
    else {
      result(
        FlutterError(code: "INVALID_ARGS", message: "Missing 'args' argument", details: nil)
      )
      return
    }

    coreBase?.commandAsync(commandArgs) { commandResult in
      switch commandResult {
      case .success:
        result(nil)
      case .failure(let error):
        result(
          FlutterError(
            code: "COMMAND_FAILED", message: error.localizedDescription, details: nil))
      }
    } ?? result(nil)
  }

  func handleSetVisible(call: FlutterMethodCall, result: @escaping FlutterResult) {
    guard let args = call.arguments as? [String: Any],
      let visible = args["visible"] as? Bool
    else {
      result(
        FlutterError(
          code: "INVALID_ARGS", message: "Missing 'visible' argument", details: nil))
      return
    }
    let restoreOnWindowVisible = args["restoreOnWindowVisible"] as? Bool ?? false

    DispatchQueue.main.async { [weak self] in
      self?.setPlayerVisible(visible, restoreOnWindowVisible: restoreOnWindowVisible)
      if visible { self?.updatePlayerFrame() }
      result(nil)
    }
  }

  func handleUpdateFrame(result: @escaping FlutterResult) {
    DispatchQueue.main.async { [weak self] in
      self?.updatePlayerFrame()
      result(nil)
    }
  }

  func handleSetLogLevel(call: FlutterMethodCall, result: @escaping FlutterResult) {
    guard let args = call.arguments as? [String: Any],
      let level = args["level"] as? String
    else {
      result(FlutterError(code: "INVALID_ARGS", message: "Missing 'level'", details: nil))
      return
    }
    coreBase?.setLogLevel(level)
    result(nil)
  }

  // MARK: - MpvPlayerDelegate

  func onPropertyChange(name: String, value: Any?) {
    guard let eventSink = eventSink, let propId = nameToId[name] else { return }
    eventSink([propId, value as Any])
  }

  func onEvent(name: String, data: [String: Any]?) {
    guard let eventSink = eventSink else { return }
    var event: [String: Any] = ["type": "event", "name": name]
    if let data = data { event["data"] = data }
    eventSink(event)
  }
}