import 'dart:io';

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 Cup extends StatefulWidget {
  const Cup({super.key});

  @override
  State<Cup> createState() => _CupState();
}

class _CupState extends State<Cup> {
  bool _isLoading = true;
  String? _modelPath, _modelUri;
  String _statusMessage = "正在加载本地模型...";

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

  // 从应用支持目录加载模型
  Future<void> _loadLocalModel() async {
    try {
      setState(() {
        _statusMessage = "获取本地模型路径...";
      });

      final supportDir = await getApplicationSupportDirectory();
      final modelFile = File(p.join(supportDir.path, 'cup', 'model.gltf'));

      String modelPath =
          File(p.join(supportDir.path, 'cup', 'model.gltf')).absolute.path;
      final cupDir = Directory('${supportDir.path}/cup');
      final modelUri = File('${cupDir.path}/model.gltf').uri.toString();
      print('加载本地模modelPath: $modelPath');
      print('加载本地模modelUri: $modelUri');

      if (await modelFile.exists()) {
        setState(() {
          _modelPath = modelPath;
          _modelUri = modelUri;

          _isLoading = false;
          _statusMessage = "本地模型加载完成";
        });
      } else {
        setState(() {
          _isLoading = false;
          _statusMessage = "本地模型文件不存在";
        });
      }
    } catch (e) {
      print('加载本地模型失败: $e');
      setState(() {
        _isLoading = false;
        _statusMessage = "加载失败: $e";
      });
    }
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: const Text('本地模型查看'),
      ),
      body: _isLoading
          ? Center(
              child: Column(
                mainAxisAlignment: MainAxisAlignment.center,
                children: [
                  const CircularProgressIndicator(),
                  const SizedBox(height: 16),
                  Text(_statusMessage),
                ],
              ),
            )
          : _modelPath == null
              ? Center(
                  child: Column(
                    mainAxisAlignment: MainAxisAlignment.center,
                    children: [
                      const Icon(Icons.error, size: 48, color: Colors.red),
                      const SizedBox(height: 16),
                      Text(_statusMessage),
                      const SizedBox(height: 16),
                      ElevatedButton(
                        onPressed: _loadLocalModel,
                        child: const Text('重试'),
                      ),
                    ],
                  ),
                )
              : ViewerWidget(
                  // assetPath: "file://$_modelPath",
                  assetPath: _modelUri,
                  skyboxPath: "assets/default_env_skybox.ktx",
                  iblPath: "assets/default_env_ibl.ktx",
                  transformToUnitCube: true,
                  initialCameraPosition: Vector3(0, 0, 6),
                  background: Colors.grey[200],
                  manipulatorType: ManipulatorType.ORBIT,
                  initial: const Center(
                    child: CircularProgressIndicator(),
                  ),
                ),
    );
  }
}