import 'package:dio/dio.dart';
import 'package:get/get.dart' hide MultipartFile, FormData;
import 'dart:io';
import 'package:path/path.dart' as path;
import '../../../data/models/problem_model.dart';
import '../../../data/providers/local_database.dart';

class ProblemController extends GetxController {
  final LocalDatabase _localDatabase;
  final RxList<Problem> problems = <Problem>[].obs;
  final RxBool isLoading = false.obs;
  final Dio _dio;

  // 依赖注入，由 bindings 传入所有依赖
  ProblemController({required LocalDatabase localDatabase, required Dio dio})
    : _localDatabase = localDatabase,
      _dio = dio;

  // 获取所有已选中的问题对象
  List<Problem> get selectedProblems {
    return problems.where((p) => p.isChecked.value).toList();
  }

  // 获取未上传的问题
  List<Problem> get unuploadedProblems {
    return problems.where((p) => !p.isUploaded).toList();
  }

  @override
  void onInit() {
    super.onInit();
    loadProblems();
  }

  Future<void> loadProblems() async {
    isLoading.value = true;
    try {
      problems.value = await _localDatabase.getProblems();
    } catch (e) {
      Get.snackbar('错误', '加载问题失败: $e');
      rethrow;
    } finally {
      isLoading.value = false;
    }
  }

  /// 在本地数据库和GetX列表中添加一个新问题
  Future<void> addProblem(Problem problem) async {
    try {
      // 确保问题有ID
      if (problem.id == null) {
        problem = problem.copyWith(
          id: DateTime.now().millisecondsSinceEpoch.toString(),
        );
      }

      await _localDatabase.insertProblem(problem);
      problems.add(problem);
    } catch (e) {
      Get.snackbar('错误', '保存问题失败: $e');
      rethrow;
    }
  }

  /// 在本地数据库和GetX列表中更新一个现有问题
  Future<void> updateProblem(Problem problem) async {
    try {
      await _localDatabase.updateProblem(problem);
      final index = problems.indexWhere((p) => p.id == problem.id);
      if (index != -1) {
        problems[index] = problem;
      }
    } catch (e) {
      Get.snackbar('错误', '更新问题失败: $e');
      rethrow;
    }
  }

  /// 删除单个问题
  Future<void> deleteProblem(Problem problem) async {
    try {
      if (problem.id != null) {
        await _localDatabase.deleteProblem(problem.id!);

        // 从本地列表中移除
        problems.remove(problem);

        // 删除关联的图片文件
        await _deleteProblemImages(problem);
      }
    } catch (e) {
      Get.snackbar('错误', '删除问题失败: $e');
      rethrow;
    }
  }

  /// 批量删除选中的问题
  Future<void> deleteSelectedProblems() async {
    final problemsToDelete = selectedProblems;
    if (problemsToDelete.isEmpty) {
      Get.snackbar('提示', '请至少选择一个问题进行删除');
      return;
    }

    try {
      for (var problem in problemsToDelete) {
        await deleteProblem(problem);
      }
      Get.snackbar('成功', '已删除${problemsToDelete.length}个问题');
    } catch (e) {
      Get.snackbar('错误', '删除问题失败: $e');
    }
  }

  /// 删除问题关联的图片文件
  Future<void> _deleteProblemImages(Problem problem) async {
    for (var imagePath in problem.imagePaths) {
      try {
        final file = File(imagePath);
        if (await file.exists()) {
          await file.delete();
        }
      } catch (e) {
        print('删除图片失败: $imagePath, 错误: $e');
      }
    }
  }

  /// 上传单个问题到服务器
  Future<bool> uploadProblem(Problem problem) async {
    try {
      final formData = FormData.fromMap({
        'description': problem.description,
        'location': problem.location,
        'createdAt': problem.createdAt.toIso8601String(),
        'boundInfo': problem.boundInfo ?? '',
      });

      // 添加图片文件
      for (var imagePath in problem.imagePaths) {
        final file = File(imagePath);
        if (await file.exists()) {
          formData.files.add(
            MapEntry(
              'images',
              await MultipartFile.fromFile(
                imagePath,
                filename: path.basename(imagePath),
              ),
            ),
          );
        }
      }

      final response = await _dio.post(
        'https://your-server.com/api/problems',
        data: formData,
        options: Options(
          sendTimeout: const Duration(seconds: 30),
          receiveTimeout: const Duration(seconds: 30),
        ),
      );

      if (response.statusCode == 200) {
        // 标记为已上传
        final updatedProblem = problem.copyWith(isUploaded: true);
        await updateProblem(updatedProblem);
        return true;
      } else {
        throw Exception('服务器返回错误状态码: ${response.statusCode}');
      }
    } on DioException catch (e) {
      if (e.type == DioExceptionType.connectionTimeout ||
          e.type == DioExceptionType.receiveTimeout) {
        Get.snackbar('网络超时', '请检查网络连接后重试');
      } else {
        Get.snackbar('网络错误', '上传问题失败: ${e.message}');
      }
      return false;
    } catch (e) {
      Get.snackbar('错误', '上传问题失败: $e');
      return false;
    }
  }

  /// 批量上传所有未上传的问题
  Future<void> uploadAllUnuploaded() async {
    final unuploaded = unuploadedProblems;
    if (unuploaded.isEmpty) {
      Get.snackbar('提示', '没有需要上传的问题');
      return;
    }

    isLoading.value = true;
    int successCount = 0;

    for (var problem in unuploaded) {
      final success = await uploadProblem(problem);
      if (success) {
        successCount++;
      }
      // 添加短暂延迟，避免服务器压力过大
      await Future.delayed(const Duration(milliseconds: 500));
    }

    isLoading.value = false;

    if (successCount > 0) {
      Get.snackbar('成功', '已成功上传$successCount个问题');
    }

    if (successCount < unuploaded.length) {
      Get.snackbar('部分成功', '有${unuploaded.length - successCount}个问题上传失败');
    }
  }

  /// 绑定信息到问题
  Future<void> bindInfoToProblem(String id, String info) async {
    try {
      final problem = problems.firstWhere((p) => p.id == id);
      final updatedProblem = problem.copyWith(boundInfo: info);
      await updateProblem(updatedProblem);
      Get.snackbar('成功', '信息已绑定');
    } catch (e) {
      Get.snackbar('错误', '未找到问题或绑定失败: $e');
    }
  }

  /// 清除所有选中的状态
  void clearSelections() {
    for (var problem in problems) {
      problem.isChecked.value = false;
    }
  }
}