import 'package:chicken_farm/core/services/upload_service.dart';
import 'package:flutter/material.dart';
import 'package:go_router/go_router.dart';

class UploadPage extends StatefulWidget {
  const UploadPage({super.key});

  @override
  State<UploadPage> createState() => _UploadPageState();
}

class _UploadPageState extends State<UploadPage> {
  late UploadService _uploadService;
  int _totalOperations = 0;
  int _uploadedOperations = 0;
  String _status = '准备上传...';
  bool _isUploading = false;
  bool _uploadCompleted = false;

  @override
  void initState() {
    super.initState();
    _uploadService = UploadService();
    _startUpload();
  }

  Future<void> _startUpload() async {
    setState(() {
      _isUploading = true;
      _status = '开始上传...';
    });

    try {
      await _uploadService.uploadPendingOperations(
        context: context, // 传递 context 给 upload service
        onProgress: (uploaded, total, status) {
          setState(() {
            _uploadedOperations = uploaded;
            _totalOperations = total;
            _status = status;
          });
        },
        onComplete: () {
          setState(() {
            _isUploading = false;
            _uploadCompleted = true;
            _status = '上传完成';
          });
        },
        onError: (message) {
          setState(() {
            _isUploading = false;
            _status = '上传出错: $message';
          });
        },
      );
    } catch (e) {
      setState(() {
        _isUploading = false;
        _status = '上传异常: ${e.toString()}';
      });
    }
  }

  // 后台上传
  void _backgroundUpload() {
    // 返回上一页并传递false表示后台上传
    context.pop(false);
  }

  @override
  Widget build(BuildContext context) {
    return PopScope(
      canPop: !_isUploading, // 只有在不上传时才能返回
      child: Scaffold(
        appBar: AppBar(
          title: const Text('数据上传'),
          automaticallyImplyLeading: false, // 禁用返回按钮
        ),
        body: Padding(
          padding: const EdgeInsets.all(16.0),
          child: Column(
            mainAxisAlignment: MainAxisAlignment.center,
            children: [
              Text(
                _status,
                style: Theme.of(context).textTheme.headlineSmall,
                textAlign: TextAlign.center,
              ),
              const SizedBox(height: 30),
              if (_totalOperations > 0) ...[
                LinearProgressIndicator(
                  value: _uploadedOperations / _totalOperations,
                  minHeight: 10,
                ),
                const SizedBox(height: 10),
                Text('$_uploadedOperations / $_totalOperations'),
                const SizedBox(height: 30),
              ],
              if (_isUploading) ...[
                ElevatedButton(
                  onPressed: _backgroundUpload,
                  child: const Text('后台上传'),
                ),
              ] else if (_uploadCompleted) ...[
                ElevatedButton(
                  onPressed: () {
                    context.pop(true); // 返回上一页并传递结果
                  },
                  child: const Text('返回'),
                ),
              ] else ...[
                ElevatedButton(
                  onPressed: () {
                    context.pop(false); // 返回上一页并传递结果
                  },
                  child: const Text('退出'),
                ),
              ],
            ],
          ),
        ),
      ),
    );
  }
}