import Flutter
import UIKit

@main
@objc class AppDelegate: FlutterAppDelegate {
  override func application(
    _ application: UIApplication,
    didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?
  ) -> Bool {
  // 获取Flutter引擎
      let controller : FlutterViewController = window?.rootViewController as! FlutterViewController
      // 创建MethodChannel
      let channel = FlutterMethodChannel(name: "com.chat.auu.snapchat_share/intent", binaryMessenger: controller.binaryMessenger)

      // 设置方法调用处理器
      channel.setMethodCallHandler { [weak self] (call: FlutterMethodCall, result: @escaping FlutterResult) -> Void in
        // 处理shareToSnapchat方法调用
        if call.method == "shareToSnapchat" {
          // 获取Flutter传递的text参数
          let text = call.arguments as? [String: Any]? ?? [:]
          let shareText = text?["text"] as? String ?? ""
          // 调用分享方法
          self?.shareToSnapchat(text: shareText, result: result)
        } else {
          // 方法未实现
          result(FlutterMethodNotImplemented)
        }
      }
    GeneratedPluginRegistrant.register(with: self)
    return super.application(application, didFinishLaunchingWithOptions: launchOptions)
  }

  private func shareToSnapchat(text: String, result: @escaping FlutterResult) {
      // 1. 构建Snapchat的分享URL
      guard let snapchatUrl = URL(string: "snapchat://") else {
        result(FlutterError(code: "INVALID_URL", message: "Snapchat URL无效", details: nil))
        return
      }

      // 2. 检查设备是否安装了Snapchat
      if UIApplication.shared.canOpenURL(snapchatUrl) {
        // 构建分享参数（根据Snapchat的URL Scheme文档调整）
        let shareParams = [
          "text": text
        ]

        // 3. 拼接分享URL（示例，具体参数请参考Snapchat官方文档）
        var components = URLComponents(url: snapchatUrl, resolvingAgainstBaseURL: true)
        components?.queryItems = shareParams.map { URLQueryItem(name: $0.key, value: $0.value) }

        guard let finalUrl = components?.url else {
          result(FlutterError(code: "URL_BUILD_FAILED", message: "Open Snapchat Fail", details: nil))
          return
        }

        // 4. 打开Snapchat进行分享
        if #available(iOS 10.0, *) {
          UIApplication.shared.open(finalUrl, options: [:]) { success in
            if success {
              result(nil) // 分享成功
            } else {
              result(FlutterError(code: "SHARE_FAILED", message: "Open Snapchat Fail", details: nil))
            }
          }
        } else {
          // iOS 9及以下兼容
          let success = UIApplication.shared.openURL(finalUrl)
          if success {
            result(nil)
          } else {
            result(FlutterError(code: "SHARE_FAILED", message: "Open Snapchat Fail", details: nil))
          }
        }
      } else {
        // 设备未安装Snapchat
        result(FlutterError(code: "SNAPCHAT_NOT_INSTALLED", message: "Snapchat is not installed.", details: nil))
      }
    }
}