// modules/problem/controllers/problem_controller.dart
import 'package:dio/dio.dart';
import 'package:flutter_screenutil/flutter_screenutil.dart';
import 'package:get/get.dart' hide MultipartFile, FormData;
import 'package:flutter/material.dart';
import 'dart:io';
import 'package:path/path.dart' as path;
import 'package:problem_check_system/data/providers/http_provider.dart';
import 'package:problem_check_system/modules/problem/views/widgets/custom_data_range_dropdown.dart';
import 'package:problem_check_system/data/models/problem_model.dart';
import 'package:problem_check_system/data/providers/local_database.dart';
import 'package:problem_check_system/data/providers/connectivity_provider.dart';

class ProblemController extends GetxController
    with GetSingleTickerProviderStateMixin {
  /// 依赖注入适配器
  final LocalDatabase localDatabase;
  final HttpProvider httpProvider;
  final ConnectivityProvider connectivityProvider;

  /// 最近问题列表
  final RxList<Problem> problems = <Problem>[].obs;

  /// 历史问题列表
  final RxList<Problem> historyProblems = <Problem>[].obs;

  /// 未上传的问题列表
  final RxList<Problem> unUploadedProblems = <Problem>[].obs;
  final RxList<Problem> selectedUnUploadedProblems = <Problem>[].obs;
  final Rx<bool> allSelected = false.obs;
  final RxBool isUploadEnabled = false.obs;

  /// 筛选条件
  final Rx<DateRange> selectedDateRange = DateRange.oneWeek.obs;
  final RxString selectedUploadStatus = '全部'.obs;
  final RxString selectedBindingStatus = '全部'.obs;

  /// 是否加载中
  final RxBool isLoading = false.obs;

  late TabController tabController;

  /// floatingButton 拖动
  final double _fabSize = 56.0;
  final double _edgePaddingX = 27.0.w;
  final double _edgePaddingY = 111.0.h;
  final fabUploadPosition = Offset(337.0, 703.7).obs;

  /// get 选中的
  RxBool get isOnline => connectivityProvider.isOnline;

  ProblemController({
    required this.localDatabase,
    required this.httpProvider,
    required this.connectivityProvider,
  });

  @override
  void onInit() {
    super.onInit();
    tabController = TabController(length: 2, vsync: this);
    tabController.addListener(_onTabChanged);
    // 监听 unUploadedProblems 列表的变化，并在变化时更新 selectedProblems
    ever(unUploadedProblems, (_) => _updateSelectedList());
    // 监听 selectedProblems 列表，更新上传按钮状态
    ever(selectedUnUploadedProblems, (_) => _updateUploadButtonState());
    loadProblems();
    // 查询未上传问题
    loadUnUploadedProblems();
  }

  @override
  void onClose() {
    tabController.dispose();
    super.onClose();
  }

  /// 当单个问题的选中状态改变时调用
  void onProblemCheckedChange() {
    // 重新计算 selectedUnUploadedProblems 列表
    _updateSelectedList();
    // 因为 _updateSelectedList 已经会触发 selectedUnUploadedProblems 的变化，
    // 所以 _updateUploadButtonState() 会被 ever 监听器自动调用。
  }

  /// 上传问题逻辑
  void _updateSelectedList() {
    selectedUnUploadedProblems.clear();
    for (var problem in unUploadedProblems) {
      if (problem.isChecked.value) {
        selectedUnUploadedProblems.add(problem);
      }
    }
  }

  void _updateUploadButtonState() {
    isUploadEnabled.value = selectedUnUploadedProblems.isNotEmpty;
  }

  void selectAll() {
    final bool newState = !allSelected.value;
    for (var problem in unUploadedProblems) {
      problem.isChecked.value = newState;
    }
    allSelected.value = newState;
    _updateSelectedList();
  }

  void uploadProblems() {
    if (selectedUnUploadedProblems.isEmpty) return;
    // 实际的上传逻辑，例如调用 API
    print('开始上传 ${selectedUnUploadedProblems.length} 个问题...');
    // 上传完成后，清空列表或更新状态
    selectedUnUploadedProblems.clear();
  }

  /// floatingButton更新位置
  void updateFabUploadPosition(Offset delta) {
    final screenWidth = ScreenUtil().screenWidth;
    final screenHeight = ScreenUtil().screenHeight;

    Offset newPosition = fabUploadPosition.value + delta;

    // 限制水平范围：按钮左边缘与屏幕左边缘的距离
    double clampedDx = newPosition.dx.clamp(
      _edgePaddingX,
      screenWidth - _fabSize - _edgePaddingX,
    );

    // 限制垂直范围：按钮上边缘与屏幕上边缘的距离
    double clampedDy = newPosition.dy.clamp(
      _edgePaddingY,
      screenHeight - _fabSize - _edgePaddingY,
    );

    fabUploadPosition.value = Offset(clampedDx, clampedDy);
  }

  /// floatingButton 贴靠
  void snapToEdge() {
    final screenWidth = ScreenUtil().screenWidth;

    // 获取当前按钮的水平中心点
    final buttonCenterDx = fabUploadPosition.value.dx + _fabSize / 2;

    double newDx;

    // 判断按钮中心点位于屏幕的左半部分还是右半部分
    if (buttonCenterDx < screenWidth / 2) {
      // 贴靠到左侧，按钮左边缘与屏幕左边缘距离为 _edgePaddingX
      newDx = _edgePaddingX;
    } else {
      // 贴靠到右侧，按钮右边缘与屏幕右边缘距离为 _edgePaddingX
      newDx = screenWidth - _fabSize - _edgePaddingX;
    }

    // 关键：只更新水平位置，垂直位置保持不变
    fabUploadPosition.value = Offset(newDx, fabUploadPosition.value.dy);
  }

  void _onTabChanged() {
    if (!tabController.indexIsChanging) {
      selectedDateRange.value = DateRange.oneWeek;
      selectedUploadStatus.value = '全部';
      selectedBindingStatus.value = '全部';
      loadProblems();
    }
  }

  Future<void> loadProblems() async {
    isLoading.value = true;
    try {
      // 根据 Tab 索引设置查询参数的默认值
      final bool isProblemListTab = tabController.index == 0;

      final DateTime startDate = isProblemListTab
          ? selectedDateRange.value.startDate
          : DateTime(2000); // 历史列表从很早的日期开始

      final DateTime endDate = DateTime.now();

      final String uploadStatus = isProblemListTab
          ? selectedUploadStatus.value
          : '全部';

      final String bindStatus = isProblemListTab
          ? selectedBindingStatus.value
          : '全部';

      // 只执行一次数据库查询
      final loadedProblems = await localDatabase.getProblems(
        startDate: startDate,
        endDate: endDate,
        uploadStatus: uploadStatus,
        bindStatus: bindStatus,
      );

      // 根据 Tab 索引将数据分配给正确的列表
      if (isProblemListTab) {
        problems.assignAll(loadedProblems);
      } else {
        historyProblems.assignAll(loadedProblems);
      }
    } catch (e) {
      Get.snackbar('错误', '加载问题失败: $e');
    } finally {
      isLoading.value = false;
    }
  }

  /// 筛选问题
  void updateFiltersAndLoadProblems({
    DateRange? newDateRange,
    String? newUploadStatus,
    String? newBindingStatus,
  }) {
    if (newDateRange != null) {
      selectedDateRange.value = newDateRange;
    }
    if (newUploadStatus != null) {
      selectedUploadStatus.value = newUploadStatus;
    }
    if (newBindingStatus != null) {
      selectedBindingStatus.value = newBindingStatus;
    }

    // 只要调用此方法，就重新加载数据
    loadProblems();
  }

  // 新增方法：查询所有未上传的问题
  Future<void> loadUnUploadedProblems() async {
    isLoading.value = true;
    try {
      // 调用 _localDatabase.getProblems 并只筛选 '未上传' 的问题
      unUploadedProblems.value = await localDatabase.getProblems(
        uploadStatus: '未上传',
      );
    } catch (e) {
      Get.snackbar('错误', '加载未上传问题失败: $e');
    } finally {
      isLoading.value = false;
    }
  }

  Future<void> addProblem(Problem problem) async {
    try {
      await localDatabase.insertProblem(problem);
      loadProblems();
    } catch (e) {
      Get.snackbar('错误', '保存问题失败: $e');
      rethrow;
    }
  }

  Future<void> updateProblem(Problem problem) async {
    try {
      await localDatabase.updateProblem(problem);
      loadProblems();
    } catch (e) {
      Get.snackbar('错误', '更新问题失败: $e');
      rethrow;
    }
  }

  Future<void> deleteProblem(Problem problem) async {
    try {
      if (problem.id != null) {
        await localDatabase.deleteProblem(problem.id!);
        await _deleteProblemImages(problem);
        loadProblems();
      }
    } catch (e) {
      Get.snackbar('错误', '删除问题失败: $e');
      rethrow;
    }
  }

  Future<void> deleteSelectedProblems() async {
    final problemsToDelete = selectedUnUploadedProblems;
    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) {
        if (problem.id != null) {
          await localDatabase.deleteProblem(problem.id!);
          await _deleteProblemImages(problem);
        }
      }
      Get.snackbar('成功', '已删除${problemsToDelete.length}个问题');
      loadProblems();
    } catch (e) {
      Get.snackbar('错误', '删除问题失败: $e');
    }
  }

  Future<void> _deleteProblemImages(Problem problem) async {
    for (var imagePath in problem.imageUrls) {
      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');
      }
    }
  }

  Future<bool> uploadProblem(Problem problem) async {
    try {
      final formData = FormData.fromMap({
        'description': problem.description,
        'location': problem.location,
        'createdAt': problem.createdAt.toIso8601String(),
        'boundInfo': problem.bindData ?? '',
      });

      for (var imageUrl in problem.imageUrls) {
        final file = File(imageUrl);
        if (await file.exists()) {
          formData.files.add(
            MapEntry(
              'images',
              await MultipartFile.fromFile(
                imageUrl,
                filename: path.basename(imageUrl),
              ),
            ),
          );
        }
      }

      final response = await httpProvider.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) {
        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;
    }
  }

  Future<void> uploadAllUnuploaded() async {
    if (!isOnline.value) {
      Get.snackbar('提示', '当前无网络，无法上传');
      return;
    }

    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++;
      }
      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');
    }
    loadProblems();
  }

  Future<void> bindInfoToProblem(String id, String info) async {
    try {
      final problem = historyProblems.firstWhere((p) => p.id == id);
      final updatedProblem = problem.copyWith(bindData: 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');
    }
  }

  void clearSelections() {
    for (var problem in historyProblems) {
      problem.isChecked.value = false;
    }
  }
}