import 'dart:io';

import 'package:animations/utils/binary_manager.dart';
import 'package:flutter/material.dart';
import 'package:path/path.dart' as p;
import 'package:path_provider/path_provider.dart';
import 'package:thermion_flutter/thermion_flutter.dart';

class LocalModelViewer extends StatefulWidget {
  @override
  _LocalModelViewerState createState() => _LocalModelViewerState();
}

class _LocalModelViewerState extends State<LocalModelViewer> {
  ThermionViewer? _viewer;
  ThermionAsset? _asset;
  bool _isLoading = true;
  bool _hasError = false;
  String _statusMessage = "初始化中...";

  @override
  void initState() {
    super.initState();

    _initializeViewerAndLoadModel();
  }

  Future<void> _initializeViewerAndLoadModel() async {
    try {
      // 获取应用支持目录并构建模型文件路径
      final supportDir = await getApplicationSupportDirectory();
      final modelFile = File(p.join(supportDir.path, 'cup', 'model.gltf'));

      // 检查文件是否存在
      if (!await modelFile.exists()) {
        await BinaryManager.migrate3DModels();
        await Future.delayed(const Duration(milliseconds: 3000));

        // throw Exception("模型文件不存在于路径: ${modelFile.path}");
      }
      setState(() {
        _statusMessage = "创建3D查看器...";
      });

      // 创建ThermionViewer实例
      _viewer = await ThermionFlutterPlugin.createViewer();

      setState(() {
        _statusMessage = "获取模型路径...";
      });

      setState(() {
        _statusMessage = "加载环境光和天空盒...";
      });

      // 加载环境光和天空盒（确保在pubspec.yaml中注册）
      await _viewer!.loadSkybox("assets/default_env_skybox.ktx");
      await _viewer!.loadIbl("assets/default_env_ibl.ktx");

      setState(() {
        _statusMessage = "加载3D模型...";
      });

      // 加载glTF模型 - 使用文件URI格式
      _asset = await _viewer!.loadGltf("file://${modelFile.path}");

      // 可选：将模型缩放到单位立方体
      await _asset!.transformToUnitCube();

      // 配置场景
      final camera = await _viewer!.getActiveCamera();
      await camera.lookAt(Vector3(0, 0, 6));

      // 开始渲染
      await _viewer!.setRendering(true);

      setState(() {
        _isLoading = false;
        _hasError = false;
        _statusMessage = "加载完成";
      });
    } catch (e) {
      print("加载模型失败: $e");
      setState(() {
        _isLoading = false;
        _hasError = true;
        _statusMessage = "加载失败: $e";
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    if (_isLoading) {
      return Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            CircularProgressIndicator(),
            SizedBox(height: 16),
            Text(_statusMessage),
          ],
        ),
      );
    }

    if (_hasError || _viewer == null) {
      return Center(
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Icon(Icons.error_outline, color: Colors.red, size: 48),
            SizedBox(height: 16),
            Text("加载3D模型失败"),
            Text(_statusMessage, style: TextStyle(color: Colors.red)),
            SizedBox(height: 16),
            ElevatedButton(
              onPressed: _initializeViewerAndLoadModel,
              child: Text("重试"),
            ),
          ],
        ),
      );
    }

    return Scaffold(
      appBar: AppBar(
        title: const Text('本地模型查看'),
      ),
      body: ThermionListenerWidget(
        inputHandler: DelegateInputHandler.fixedOrbit(_viewer!),
        child: ThermionWidget(
          viewer: _viewer!,
          showFpsCounter: true, // 可选：显示FPS计数器
        ),
      ),
    );

    // 使用ThermionWidget显示3D内容
    return ThermionListenerWidget(
      inputHandler: DelegateInputHandler.fixedOrbit(_viewer!),
      child: ThermionWidget(
        viewer: _viewer!,
        showFpsCounter: true, // 可选：显示FPS计数器
      ),
    );
  }

  Future<void> deleteModelFile() async {
    // 获取应用支持目录
    final supportDir = await getApplicationSupportDirectory();

    // 构建 model.gltf 的完整路径
    final modelFile = File(p.join(supportDir.path, 'cup', 'model.gltf'));

    // 检查文件是否存在，然后删除
    if (await modelFile.exists()) {
      await modelFile.delete();
      print('model.gltf 已删除');
    } else {
      print('model.gltf 文件不存在');
    }
  }

  @override
  void dispose() {
    deleteModelFile();
    // 清理资源
    _viewer?.dispose();
    super.dispose();
  }
}