import 'package:flutter/material.dart';
import 'package:flutter/services.dart';
import 'unity_controller.dart';

/// Unity视图的Flutter封装
class UnityWidget extends StatefulWidget {
  /// 默认场景名称
  final String defaultScene;
  
  /// Unity视图加载完成回调
  final Function? onUnityViewCreated;
  
  /// Unity消息回调
  final Function(String)? onUnityMessage;
  
  /// 构造函数
  const UnityWidget({
    Key? key,
    required this.defaultScene,
    this.onUnityViewCreated,
    this.onUnityMessage,
  }) : super(key: key);

  @override
  State<UnityWidget> createState() => _UnityWidgetState();
}

class _UnityWidgetState extends State<UnityWidget> {
  // Unity控制器
  final UnityController _unityController = UnityController();
  
  // 是否正在加载
  bool _isLoading = true;

  @override
  void initState() {
    super.initState();
    // 加载默认场景
    _loadDefaultScene();
  }

  // 加载默认场景
  Future<void> _loadDefaultScene() async {
    setState(() {
      _isLoading = true;
    });
    
    try {
      // 打开Unity默认场景
      await _unityController.openUnityScene(widget.defaultScene);
      
      // 通知视图创建完成
      if (widget.onUnityViewCreated != null) {
        widget.onUnityViewCreated!();
      }
    } catch (e) {
      print('加载Unity场景失败: $e');
    } finally {
      setState(() {
        _isLoading = false;
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    // 根据平台返回不同的视图
    if (Theme.of(context).platform == TargetPlatform.iOS) {
      return _isLoading
          ? const Center(child: CircularProgressIndicator())
          : const UiKitView(
              viewType: 'com.yourcompany.unity_flutter/unityview',
              creationParamsCodec: StandardMessageCodec(),
            );
    } else {
      // 如果不是iOS平台，显示提示信息
      return const Center(
        child: Text('此平台不支持Unity视图，请在iOS设备上运行。'),
      );
    }
  }

  @override
  void dispose() {
    // 关闭Unity视图
    _unityController.closeUnity();
    super.dispose();
  }
}