import Flutter
import AVKit
import UIKit

@objc(FloatingUiPlugin)
public class FloatingUiPlugin: NSObject, FlutterPlugin {
  private var pipContentViewArray: [PlayerView] = []

  private static func updateAudioSession() {
    let audioSession = AVAudioSession.sharedInstance()
    do {
      if #available(iOS 14.5, *) {
        try audioSession.setCategory(.playback, mode: .moviePlayback, options: [.overrideMutedMicrophoneInterruption])
      }
      try audioSession.setActive(true)
    } catch {
      NSLog("Set audio session error: \(error.localizedDescription)")
    }
  }

  public static func register(with registrar: FlutterPluginRegistrar) {
    // 保证 PiP 能正常工作
    Self.updateAudioSession()

    let channel = FlutterMethodChannel(name: "native_plugin", binaryMessenger: registrar.messenger())
    let instance = FloatingUiPlugin()
    registrar.addMethodCallDelegate(instance, channel: channel)

    let factory = FLNativeViewFactory(messenger: registrar.messenger())
    registrar.register(factory, withId: "native_view")
  }

  public func handle(_ call: FlutterMethodCall, result: @escaping FlutterResult) {
    switch call.method {
    case "getPlatformVersion":
      result("iOS " + UIDevice.current.systemVersion)

    case "createPipContentView":
      let playerView = PlayerView()
      // 这里未来可以根据 PiP 的事件来控制播放状态
      playerView.play()
      pipContentViewArray.append(playerView)
      let ptr = Unmanaged.passUnretained(playerView).toOpaque()
      let viewId = UInt64(UInt(bitPattern: ptr))
      result(NSNumber(value: viewId))

    case "disposePipContentView":
      guard let viewIdNum = call.arguments as? NSNumber else {
        result(nil)
        return
      }
      let targetId = viewIdNum.uint64Value
      for (idx, playerView) in pipContentViewArray.enumerated() {
        let currentId = UInt64(UInt(bitPattern: Unmanaged.passUnretained(playerView).toOpaque()))
        if currentId == targetId {
          playerView.pause()
          pipContentViewArray.remove(at: idx)
          break
        }
      }
      result(nil)

    case "updatePipContentView":
      guard let data = call.arguments as? [String: Any] else {
        result(nil)
        return
      }
      let lang = data["lang"] as? String
      let cn = data["cn"] as? String
      let en = data["en"] as? String
      let viewIdNum = data["viewId"] as? NSNumber
      DispatchQueue.main.async { [weak self] in
        guard let self = self else { return }
        if let viewIdNum = viewIdNum {
          let targetId = viewIdNum.uint64Value
          for playerView in self.pipContentViewArray {
            let currentId = UInt64(UInt(bitPattern: Unmanaged.passUnretained(playerView).toOpaque()))
            if currentId == targetId {
              playerView.update(withLang: lang, cn: cn, en: en)
              break
            }
          }
        } else {
          if let playerView = self.pipContentViewArray.last {
            playerView.update(withLang: lang, cn: cn, en: en)
          }
        }
      }
      result(nil)

    default:
      result(FlutterMethodNotImplemented)
    }
  }
}