import 'dart:async';
import 'dart:io';

import 'package:classify_photo/classify_photo.dart';
import 'package:clean/widget/multi_segment_circle_indicator.dart';
import 'package:disk_space/disk_space.dart';
import 'package:flutter/Material.dart';
import 'package:get/get.dart';
import 'package:permission_handler/permission_handler.dart';
import 'package:wechat_assets_picker/wechat_assets_picker.dart';

import '../../module/image_picker/image_picker_util.dart';
import '../utils/toast_util.dart';

class PhotoScanHandler {
  static final _photoClassify = ClassifyPhoto();

  static RxBool isSimilarScanned = false.obs;
  static RxBool isPeopleScanned = false.obs;
  static RxBool isScreenShotScanned = false.obs;
  static RxBool isBlurryScanned = false.obs;

  // 人物图片
  static RxList<AssetEntity> peoplePhotos = <AssetEntity>[].obs;

  // 地点图片
  static Rx<AssetEntity?> locationPhoto = Rx<AssetEntity?>(null);

  // 截图照片
  static Rx<AssetEntity?> screenshotPhoto = Rx<AssetEntity?>(null);

  // 模糊照片
  static Rx<AssetEntity?> blurryPhoto = Rx<AssetEntity?>(null);

  // 相似照片
  static RxList<AssetEntity> similarPhotos = <AssetEntity>[].obs;

  // 添加一个标志来跟踪当前扫描状态
  bool _isScanningCancelled = false;

  List<StreamSubscription> _scanningTasks = [];

  static Rx<double> totalSpace = 0.0.obs;
  static Rx<double> usedSpace = 0.0.obs;
  static Rx<double> photoSpace = 0.0.obs;
  static Rx<double> freeSpace = 0.0.obs;

  static Rx<String> totalSpaceStr = "0.0 GB".obs;
  static Rx<String> usedSpaceStr = "0.0 GB".obs;
  static Rx<String> photoSpaceStr = "0.0 GB".obs;
  static Rx<String> freeSpaceStr = "0.0 GB".obs;

  // 计算已用存储百分比
  static double get usedSpacePercentage => (usedSpace.value / totalSpace.value) * 100;

  // 计算照片占用存储百分比
  static double get photoSpacePercentage =>
      (photoSpace.value / totalSpace.value) * 100;

  // 计算可用存储百分比
  static double get freeSpacePercentage => (freeSpace.value / totalSpace.value) * 100;

  static List<PieData> get pieDataList => [
    PieData("PhotoSpace", photoSpacePercentage, Colors.blue),
    PieData("OtherUsed", usedSpacePercentage - photoSpacePercentage,
        Colors.red),
    PieData("totalSpace", totalSpace.value, Colors.grey.withOpacity(0.1)),
  ];

  // 存储是否扫描完成
  static RxBool isStorageScanned = false.obs;

  // 监听照片库变化
  void _listenToPhotoLibraryChanges() {
    PhotoManager.addChangeCallback((change) {
      print("照片库发生变化: $change");

      // 取消当前正在进行的扫描
      _cancelCurrentScan();

      // 延迟一小段时间后重新开始扫描
      Future.delayed(Duration(milliseconds: 500), () {
        _restartScan();
      });
    });

    // 开始监听
    PhotoManager.startChangeNotify();
  }

  // 取消当前扫描
  void _cancelCurrentScan() {
    _isScanningCancelled = true;

    // 取消所有正在进行的异步任务
    for (var subscription in _scanningTasks) {
      subscription.cancel();
    }
    _scanningTasks.clear();

    print("已取消当前扫描任务");
  }

// 重新开始扫描
  void _restartScan() {
    _isScanningCancelled = false;

    isSimilarScanned.value = false;
    isPeopleScanned.value = false;
    isBlurryScanned.value = false;
    isScreenShotScanned.value = false;

    // 清除之前的结果
    similarPhotos.clear();
    peoplePhotos.clear();
    locationPhoto.value = null;
    screenshotPhoto.value = null;
    blurryPhoto.value = null;


    print("开始重新扫描照片");

    // 重新开始扫描流程
    startScanningProcess();
  }

  // 开始扫描过程
  Future<void> startScanningProcess() async {
    // 确保在开始新扫描前取消标志被重置
    _isScanningCancelled = false;

    // 清空之前的任务
    _scanningTasks.clear();

    try {
      // 按顺序执行扫描任务
      print('开始顺序扫描照片');

      // 1. 先扫描截图照片
      if (!_isScanningCancelled) {
        var screenTask = _handleScreenPhotosWithCancellation();
        _scanningTasks.add(screenTask);
        // 等待截图扫描完成
        await Future.delayed(Duration(milliseconds: 500));
      }

      // 2. 再扫描模糊照片
      if (!_isScanningCancelled) {
        var blurryTask = _handleBlurryPhotosWithCancellation();
        _scanningTasks.add(blurryTask);
        // 等待模糊照片扫描完成
        await Future.delayed(Duration(milliseconds: 500));
      }

      // 3. 然后扫描人物照片
      if (!_isScanningCancelled) {
        var peopleTask = _handlePeoplePhotosWithCancellation();
        _scanningTasks.add(peopleTask);
        // 等待人物照片扫描完成
        await Future.delayed(Duration(milliseconds: 500));
      }

      // 4. 最后扫描相似照片
      if (!_isScanningCancelled) {
        var similarTask = _handleSimilarPhotosWithCancellation();
        _scanningTasks.add(similarTask);
      }

      print('所有扫描任务已启动');
    } catch (e) {
      print('扫描过程中出错: $e');
    }
  }

  Future<void> getStorageInfo() async {

    if (Platform.isAndroid) {
      // 延迟3秒
      Future.delayed(const Duration(seconds: 3), () {
        isStorageScanned.value = true;
        totalSpace.value = 200.0;
        usedSpace.value = 50.0;
        photoSpace.value = 30.0;
        freeSpace.value = 150.0;
      });
    }

    final totalSpaceGB = (await DiskSpace.getTotalDiskSpace ?? 0) / 1000;
    final freeSpaceGB = (await DiskSpace.getFreeDiskSpace ?? 0) / 1024;
    final usedSpaceGB = ((await DiskSpace.getTotalDiskSpace ?? 0) - (await DiskSpace.getFreeDiskSpace ?? 0)) / 1024;

    totalSpaceStr.value = ImagePickerUtil.formatFileSize(
        (await DiskSpace.getTotalDiskSpace ?? 0).round(),
        decimals: 1);
    freeSpaceStr.value = ImagePickerUtil.formatFileSize(
        (await DiskSpace.getFreeDiskSpace ?? 0).round(),
        decimals: 1);
    usedSpaceStr.value = ImagePickerUtil.formatFileSize(
        ((await DiskSpace.getTotalDiskSpace ?? 0) - (await DiskSpace.getFreeDiskSpace ?? 0)).round(),
        decimals: 1);

    totalSpace.value = totalSpaceGB.round().toDouble();
    freeSpace.value = freeSpaceGB;
    usedSpace.value = usedSpaceGB;

    final classifyPhoto = ClassifyPhoto();

    try {
      final storageInfo = await classifyPhoto.getStorageInfo();

      // 转换为 GB
      final totalSpaceGB = storageInfo['totalSpace']! / (1000 * 1000 * 1000);
      final freeSpaceGB = storageInfo['freeSpace']! / (1024 * 1024 * 1024);
      final usedSpaceGB = storageInfo['usedSpace']! / (1024 * 1024 * 1024);
      final photoSpaceGB = storageInfo['photoSpace']! / (1024 * 1024 * 1024);

      totalSpaceStr.value = ImagePickerUtil.formatFileSize(
          storageInfo['totalSpace']!,
          decimals: 1);
      freeSpaceStr.value = ImagePickerUtil.formatFileSize(
          storageInfo['freeSpace']!,
          decimals: 1);
      usedSpaceStr.value = ImagePickerUtil.formatFileSize(
          storageInfo['usedSpace']!,
          decimals: 1);
      photoSpaceStr.value = ImagePickerUtil.formatFileSize(
          storageInfo['photoSpace']!,
          decimals: 1);

      totalSpace.value = totalSpaceGB.round().toDouble();
      freeSpace.value = freeSpaceGB;
      usedSpace.value = usedSpaceGB;
      photoSpace.value = photoSpaceGB;

      print('总容量: $totalSpaceStr');
      print('可用空间: $freeSpaceStr');
      print('已用空间: $usedSpaceStr');
      print('照片占用: $photoSpaceStr');
      isStorageScanned.value = true;
    } catch (e) {
      print('获取存储信息失败: $e');
    }
  }

  /// 执行所有的照片处理操作
  Future<void> handleAllPhotos() async {
    // var request = Platform.isIOS
    //     ? await Permission.photos.request()
    //     : await Permission.storage.request();
    //
    // if (request.isGranted) {
    //   PhotoManager.clearFileCache();
    //   await handleScreenPhotos();
    //   await handleBlurryPhotos();
    //   await handlePeoplePhotos();
    //   await handleSimilarPhotos();
    //   if (Platform.isAndroid) {
    //     await handleAndroidPhotos();
    //   }
    // } else if (request.isPermanentlyDenied) {
    //   ToastUtil.show("Please enable the album permission");
    //   openAppSettings();
    // } else {
    //   ToastUtil.show("Please enable the album permission");
    //
    //   isSimilarScanned.value = false;
    //   isPeopleScanned.value = false;
    //   isBlurryScanned.value = false;
    //   isScreenShotScanned.value = false;
  // }


      var currentStatus = await Permission.photos.status;

      if (currentStatus.isGranted) {
        // 已有完全权限，直接扫描
        PhotoManager.clearFileCache();
        // _listenToPhotoLibraryChanges(); // 添加监听
        await handleScreenPhotos();
        await handleBlurryPhotos();
        await handlePeoplePhotos();
        await handleSimilarPhotos();
      } else if (currentStatus.isLimited) {
        // 已有有限权限，显示自定义弹窗
        PhotoManager.clearFileCache();
        await handleScreenPhotos();
        await handleBlurryPhotos();
        await handlePeoplePhotos();
        await handleSimilarPhotos();
      } else {
        // 未授权，请求权限
        var result = await Permission.photos.request();
        if (result.isGranted || result.isLimited) {
          PhotoManager.clearFileCache();
          getStorageInfo();
          await handleScreenPhotos();
          await handleBlurryPhotos();
          await handlePeoplePhotos();
          await handleSimilarPhotos();
        } else {
          isSimilarScanned.value = true;
          isPeopleScanned.value = true;
          isBlurryScanned.value = true;
          isScreenShotScanned.value = true;
        }
      }
  }

    // 可取消的截图照片扫描
    StreamSubscription _handleScreenPhotosWithCancellation() {
      var controller = StreamController<bool>();

      Future<void> task() async {
        if (_isScanningCancelled) {
          controller.add(false);
          return;
        }

        try {
          print('开始获取截图照片');
          final photoClassify = ClassifyPhoto();
          final photos = await photoClassify.getScreenshots();

          if (_isScanningCancelled) {
            controller.add(false);
            return;
          }

          print('获取截图照片完成: ${photos?.length ?? 0} 组照片');
          isScreenShotScanned.value = true;

          if (photos != null) {
            await ImagePickerUtil.updatePhotos(photos);
            if (ImagePickerUtil.screenshotPhotos.isNotEmpty) {
              var asset = ImagePickerUtil.screenshotPhotos.first;
              screenshotPhoto.value = asset;
            }
          }

          controller.add(true);
        } catch (e) {
          print('获取截图照片失败: $e');
          controller.add(false);
        }
      }

      task();

      return controller.stream.listen((success) {
        controller.close();
      });
    }

// 可取消的模糊照片扫描
    StreamSubscription _handleBlurryPhotosWithCancellation() {
      var controller = StreamController<bool>();

      Future<void> task() async {
        if (_isScanningCancelled) {
          controller.add(false);
          return;
        }

        try {
          print('开始获取模糊照片');
          final photoClassify = ClassifyPhoto();
          final photos = await photoClassify.getBlurryPhotos();

          if (_isScanningCancelled) {
            controller.add(false);
            return;
          }

          print('获取模糊照片完成: ${photos?.length ?? 0} 组照片');
          isBlurryScanned.value = true;

          if (photos != null) {
            await ImagePickerUtil.updatePhotos(photos);
            if (ImagePickerUtil.blurryPhotos.isNotEmpty) {
              var asset = ImagePickerUtil.blurryPhotos.first;
              blurryPhoto.value = asset;
            }
          }

          controller.add(true);
        } catch (e) {
          print('获取模糊照片失败: $e');
          controller.add(false);
        }
      }

      task();

      return controller.stream.listen((success) {
        controller.close();
      });
    }

// 可取消的人物照片扫描
    StreamSubscription _handlePeoplePhotosWithCancellation() {
      var controller = StreamController<bool>();

      Future<void> task() async {
        if (_isScanningCancelled) {
          controller.add(false);
          return;
        }

        try {
          print('开始获取人物照片');
          final photoClassify = ClassifyPhoto();
          final photos = await photoClassify.getPeoplePhotos();

          if (_isScanningCancelled) {
            controller.add(false);
            return;
          }

          print('获取人物照片完成: ${photos?.length ?? 0} 组照片');
          isPeopleScanned.value = true;

          if (photos != null) {
            await ImagePickerUtil.updatePhotos(photos);

            // 处理人物照片
            peoplePhotos.clear();
            if (ImagePickerUtil.peoplePhotos.isNotEmpty) {
              for (var personPhotos in ImagePickerUtil.peoplePhotos) {
                if (_isScanningCancelled) break;

                peoplePhotos.add(personPhotos);
                if (peoplePhotos.length == 2) {
                  break;
                }
              }
            }
          }

          controller.add(true);
        } catch (e) {
          print('获取人物照片失败: $e');
          controller.add(false);
        }
      }

      task();

      return controller.stream.listen((success) {
        controller.close();
      });
    }

// 可取消的相似照片扫描
    StreamSubscription _handleSimilarPhotosWithCancellation() {
      var controller = StreamController<bool>();

      Future<void> task() async {
        if (_isScanningCancelled) {
          controller.add(false);
          return;
        }

        try {
          print('开始获取相似照片');
          final photoClassify = ClassifyPhoto();
          final photos = await photoClassify.getSimilarPhotos();

          if (_isScanningCancelled) {
            controller.add(false);
            return;
          }

          print('获取相似照片完成: ${photos?.length ?? 0} 组照片');
          isSimilarScanned.value = true;

          if (photos != null) {
            await ImagePickerUtil.updatePhotos(photos);

            similarPhotos.clear();
            if (ImagePickerUtil.similarPhotos.isNotEmpty) {
              for (var group in ImagePickerUtil.similarPhotos) {
                if (_isScanningCancelled) break;

                for (var asset in group) {
                  similarPhotos.add(asset);
                  if (similarPhotos.length == 4) {
                    break;
                  }
                }

                if (similarPhotos.length == 4) {
                  break;
                }
              }
            }
          }

          controller.add(true);
        } catch (e) {
          print('获取相似照片失败: $e');
          controller.add(false);
        }
      }

      task();

      return controller.stream.listen((success) {
        controller.close();
      });
    }

    /// 截图照片
    Future<bool> handleScreenPhotos() async {
      try {
        final photos = await _photoClassify.getScreenshots();
        print('获取截图照片完成: ${photos?.length ?? 0} 组照片');
        isScreenShotScanned.value = true;
        if (photos != null) {
          await ImagePickerUtil.updatePhotos(photos);
          if (ImagePickerUtil.screenshotPhotos.isNotEmpty) {
            var asset = ImagePickerUtil.screenshotPhotos.first;
            screenshotPhoto.value = asset;
          }
        }
      } catch (e, stackTrace) {
        print('获取截图失败: $e\n$stackTrace');
      }
      isScreenShotScanned.value = true;
      return true;
    }

    /// 模糊照片
    Future<bool> handleBlurryPhotos() async {
      try {
        final photos = await _photoClassify.getBlurryPhotos();
        print('获取模糊照片完成: ${photos?.length ?? 0} 组照片');
        isBlurryScanned.value = true;
        if (photos != null) {
          await ImagePickerUtil.updatePhotos(photos);
          if (ImagePickerUtil.blurryPhotos.isNotEmpty) {
            var asset = ImagePickerUtil.blurryPhotos.first;
            blurryPhoto.value = asset;
          }
          return true;
        }
      } catch (e, stackTrace) {
        print('获取模糊失败: $e\n$stackTrace');
      }
      isBlurryScanned.value = true;
      return true;
    }

    /// 人物照片
    Future<bool> handlePeoplePhotos() async {
      try {
        final photos = await _photoClassify.getPeoplePhotos();
        print('获取人物照片完成: ${photos?.length ?? 0} 组照片');
        isPeopleScanned.value = true;
        if (photos != null) {
          await ImagePickerUtil.updatePhotos(photos);
          // 处理人物照片
          peoplePhotos.clear();
          if (ImagePickerUtil.peoplePhotos.isNotEmpty) {
            for (var personPhotos in ImagePickerUtil.peoplePhotos) {
              peoplePhotos.add(personPhotos);
              if (peoplePhotos.length == 2) {
                break;
              }
            }
          }
          return true;
        }
      } catch (e, stackTrace) {
        print('获取人物失败: $e\n$stackTrace');
      }
      isPeopleScanned.value = true;
      return true;
    }

    /// 相似照片
    Future<bool> handleSimilarPhotos() async {
      try {
        print('开始获取相似照片');
        final photos = await _photoClassify.getSimilarPhotos();
        print('获取相似照片完成: ${photos?.length ?? 0} 组照片');
        isSimilarScanned.value = true;
        if (photos != null) {
          await ImagePickerUtil.updatePhotos(photos);
          similarPhotos.clear();
          if (ImagePickerUtil.similarPhotos.isNotEmpty) {
            for (var group in ImagePickerUtil.similarPhotos) {
              for (var asset in group) {
                similarPhotos.add(asset);
                if (similarPhotos.length == 4) {
                  break;
                }
              }
            }
          }
          return true;
        }
      } catch (e, stackTrace) {
        print('获取相似失败: $e\n$stackTrace');
      }
      isSimilarScanned.value = true;
      return true;
    }

    /// Android平台处理方式
    Future<void> handleAndroidPhotos() async {
      final List<AssetEntity> result = await ImagePickerUtil.loadAssets();
      ImagePickerUtil.peoplePhotos.value = result ?? [];
      ImagePickerUtil.locationPhotos['location'] = result ?? [];
      ImagePickerUtil.screenshotPhotos.value = result ?? [];
      ImagePickerUtil.similarPhotos.add(result ?? []);
      ImagePickerUtil.blurryPhotos.value = result ?? [];

      print("handleAndroidPhotos $result");
      print(
          "ImagePickerUtil.peoplePhotos.value ${ImagePickerUtil.peoplePhotos
              .length}");

      isSimilarScanned.value = true;
      isPeopleScanned.value = true;
      isBlurryScanned.value = true;
      isScreenShotScanned.value = true;

      similarPhotos.clear();
      if (ImagePickerUtil.similarPhotos.isNotEmpty) {
        for (var group in ImagePickerUtil.similarPhotos) {
          print(
              " ImagePickerUtil.similarPhotos ${ImagePickerUtil.similarPhotos
                  .length}");
          for (var asset in group) {
            similarPhotos.add(asset);
            if (similarPhotos.length == 4) {
              break;
            }
          }
        }
      }

      peoplePhotos.clear();
      if (ImagePickerUtil.peoplePhotos.isNotEmpty) {
        for (var personPhotos in ImagePickerUtil.peoplePhotos) {
          peoplePhotos.add(personPhotos);
          if (peoplePhotos.length == 2) {
            break;
          }
        }
      }

      if (ImagePickerUtil.blurryPhotos.isNotEmpty) {
        var asset = ImagePickerUtil.blurryPhotos.first;
        blurryPhoto.value = asset;
      }

      if (ImagePickerUtil.screenshotPhotos.isNotEmpty) {
        var asset = ImagePickerUtil.screenshotPhotos.first;
        screenshotPhoto.value = asset;
      }
    }
  }