Clean/lib/module/calendar/preview/calendar_preview_controller.dart

import 'dart:async';

import 'package:clean/base/base_controller.dart';
import 'package:clean/module/calendar/selected_preview/calendar_selected_preview_view.dart';
import 'package:flutter/Material.dart';
import 'package:flutter_card_swiper/flutter_card_swiper.dart';
import 'package:flutter_smart_dialog/flutter_smart_dialog.dart';
import 'package:get/get.dart';
import 'package:wechat_assets_picker/wechat_assets_picker.dart';

import '../../../data/repositories/user_repository.dart';
import '../../../dialog/photo_delete_finish_dialog.dart';
import '../../../dialog/photo_deleting_dialog.dart';
import '../../../utils/file_size_calculator_util.dart';
import '../../../utils/toast_util.dart';
import '../../image_picker/image_picker_util.dart';
import '../../people_photo/photo_group.dart';
import '../../store/store_view.dart';

class CalendarPreviewController extends BaseController
    with GetSingleTickerProviderStateMixin {
  final Rx<PhotoGroup> photoGroup =
      PhotoGroup(isSelected: false, images: []).obs;

  late String? currentImageId;

  final CardSwiperController cardSwiperController = CardSwiperController();

  final RxBool isSwiperEnd = false.obs;
  RxInt groupIndex = 0.obs;


  late AnimationController animationController;
  RxBool animationIsComplete = false.obs;

  @override
  void onInit() {
    super.onInit();
    _getArgs(); // 获取传递的参数
    animationController = AnimationController(
      vsync: this,
      duration: const Duration(seconds: 3),
    );

    WidgetsBinding.instance.addPostFrameCallback((_) {
      if (currentImageId != null) {
        for (int i = 0; i < photoGroup.value.images.length; i++) {
          if (photoGroup.value.images[i].id == currentImageId) {
            debugPrint('photoGroups[i].id ${photoGroup.value.images[i].id},i $i');
            groupIndex.value = i;
            cardSwiperController.moveTo(i);
            break;
          }
        }
      }
    });

    animationController.addStatusListener((status) {
      if (status == AnimationStatus.forward) {
        //   延迟一秒
        Future.delayed(Duration(seconds: 1), () {
          animationIsComplete.value = true;
        });
      }
      if (status == AnimationStatus.completed) {
        Future.delayed(Duration(seconds: 1), () {
          CalendarSelectedPreviewPage.start(photoGroup.value);
        });
      }
    });
  }

  // 获取参数
  void _getArgs() {
    photoGroup.value = parameters?['photoGroup'];
    currentImageId = parameters?['currentImageId'];
  }

  void clickUnselect() {
    debugPrint("clickUnselect");
    cardSwiperController.swipe(CardSwiperDirection.right);
  }

  FutureOr<bool> onSwipe(
    int previousIndex,
    int? currentIndex,
    CardSwiperDirection direction,
  ) {
    debugPrint(
      'The card $previousIndex was swiped to the ${direction.name}. Now the card $currentIndex is on top',
    );

    if (currentIndex != null) {
      groupIndex.value = currentIndex;
    }
    // 预加载

    // precacheImage(AssetEntityImageProvider(entity), context);

    // 如果direction是left，
    if (direction == CardSwiperDirection.left) {
      //   先看看图片id是不是在selectedPhotosIds里面，如果在，不处理，如果不在，添加到selectedPhotosIds里面
      if (!photoGroup.value.selectedPhotosIds
          .contains(photoGroup.value.images[previousIndex].id)) {
        debugPrint(
            'add photoGroups[groupIndex.value].id ${photoGroup.value.images[previousIndex].id}');
        photoGroup.value.selectedPhotosIds
            .add(photoGroup.value.images[previousIndex].id);
      }
    } else if (direction == CardSwiperDirection.right) {
      //   先看看图片id是不是在selectedPhotosIds里面，如果在，在selectedPhotosIds移除，不处理，如果不在，不处理
      if (photoGroup.value.selectedPhotosIds
          .contains(photoGroup.value.images[previousIndex].id)) {
        debugPrint(
            'remove photoGroups[groupIndex.value].id ${photoGroup.value.images[previousIndex].id}');
        photoGroup.value.selectedPhotosIds
            .remove(photoGroup.value.images[previousIndex].id);
      }
    }

    updateSelectedFilesSize();
    return true;
  }

  bool onSwiperUndo(
    int? previousIndex,
    int currentIndex,
    CardSwiperDirection direction,
  ) {
    debugPrint(
        'The card $currentIndex was swiped back to the ${direction.name}. Now the card $previousIndex is on top');

    groupIndex.value = currentIndex;
    //   撤销之前左滑的操作
    if (direction == CardSwiperDirection.left) {
      debugPrint(
          'photoGroups[groupIndex.value].id ${photoGroup.value.images[groupIndex.value].id}');
      if (photoGroup.value.selectedPhotosIds
          .contains(photoGroup.value.images[groupIndex.value].id)) {
        photoGroup.value.selectedPhotosIds
            .remove(photoGroup.value.images[groupIndex.value].id);
      }
    }

    updateSelectedFilesSize();

    return true;
  }

  onSwiperEnd() {
    isSwiperEnd.value = true;
    debugPrint('onSwiperEnd');

    // 延迟500ms
    Future.delayed(Duration(milliseconds: 200), () {
      animationController.forward(from: 0);
    });
    PhotoManager.clearFileCache();
    // PhotoSelectedPreviewPage.start(photosType, selectedPhotosIds);
  }

  void recoverSelectPhoto() {
    debugPrint('PhotoPreviewController recoverSelectPhoto');

    cardSwiperController.undo();
  }

  void clickSelect() {
    cardSwiperController.swipe(CardSwiperDirection.left);
  }

  void clickBack() {
    Get.back();
  }

  clickDelete() async {
    debugPrint('CalendarPreviewController clickDelete');
    if (userRepository.isVip()) {

      if (photoGroup.value.selectedPhotosIds.isNotEmpty) {
        photoDeletingDialog();
        // 获取要删除的资产
        final assetsToDelete = photoGroup.value.images
            .where(
              (asset) => photoGroup.value.selectedPhotosIds.contains(asset.id),
        )
            .toList();

        // 调用方法会返回被删除的资源，如果全部失败会返回空列表。
        final List<String> result = await PhotoManager.editor.deleteWithIds(
          assetsToDelete.map((e) => e.id).toList(),
        );


        //   比较result和selectedPhotosIds，如果result和selectedPhotosIds相等，说明删除成功，走下面的逻辑
        // 如果不相等，说明有删除失败的，走else逻辑
        if (result.length == photoGroup.value.selectedPhotosIds.length) {

          ImagePickerUtil.updatePhotoData(
              photoGroup.value.selectedPhotosIds);
          cleanSelections();

          ToastUtil.show('Delete success');
          Future.delayed(Duration(seconds: 2), () {
            SmartDialog.dismiss(tag: 'photoDeletingDialog');
            photoDeleteFinishDialog();
          });
        } else {
          SmartDialog.dismiss(tag: 'photoDeletingDialog');
          // 删除失败
          ToastUtil.show("Delete failed");
        }
      }

    } else {
      StorePage.start();
    }
    }

  //删除成功清除选中的图片
  void cleanSelections() async {
    photoGroup.value.images
        .removeWhere((element) => photoGroup.value.selectedPhotosIds.contains(element.id));
    photoGroup.value.selectedPhotosIds.clear();
    photoGroup.refresh();
    if (photoGroup.value.images.isEmpty) {
      return;
    }

    isSwiperEnd.value = false;

    if (photoGroup.value.images.isNotEmpty) {
      WidgetsBinding.instance.addPostFrameCallback((_) {
        groupIndex.value = 0;
        cardSwiperController.moveTo(0);
      });
    }
    updateSelectedFilesSize();

  }

  // 将selectedFilesSize转成String类型,然后单位转换,如果超过1MB,则转成MB,超过1GB,则转成GB,否则KB
  String get selectedFilesSizeString {

    final double sizeInKB = photoGroup.value.selectedTotalSize.value;

    if (sizeInKB >= 1024 * 1024) {  // 先检查最大单位（GB）
      return "${(sizeInKB / (1024 * 1024)).toStringAsFixed(2)}GB";
    } else if (sizeInKB >= 1024) {  // 然后检查MB
      return "${(sizeInKB / 1024).toStringAsFixed(2)}MB";
    } else {  // 最后是KB
      return "${sizeInKB.toStringAsFixed(2)}KB";
    }
  }

  Future<void> updateSelectedFilesSize() async {
    // 如果没有选中的文件，直接返回
    if (photoGroup.value.selectedCount == 0) {
      photoGroup.value.selectedTotalSize.value = 0;
      return;
    }

    double totalSize = 0;
    final uncasedIds = photoGroup.value.selectedPhotosIds
        .where((id) => !FileSizeCalculatorUtil.fileSizeCache.containsKey(id))
        .toSet();

    // **1️⃣ 先处理缓存中的文件**

    totalSize = photoGroup.value.selectedPhotosIds
        .fold(0, (prev, id) => prev + (FileSizeCalculatorUtil.fileSizeCache[id] ?? 0));

    // **2️⃣ 分批处理未缓存的文件**
    const batchSize = 50;
    for (int i = 0; i < uncasedIds.length; i += batchSize) {
      if (photoGroup.value.selectedPhotosIds.isEmpty) {
        photoGroup.value.selectedTotalSize.value = 0;
        return;
      }

      final batch = uncasedIds.skip(i).take(batchSize);
      final sizes = await Future.wait(batch.map(FileSizeCalculatorUtil.getFileSize));

      totalSize += sizes.fold(0, (sum, size) => sum + size);

      // **再检查一次是否被清空，避免无意义计算**
      if (photoGroup.value.selectedPhotosIds.isEmpty) {
        photoGroup.value.selectedTotalSize.value = 0;
        return;
      }

      // **减少 UI 更新频率**
      if (i % (batchSize * 2) == 0 || i + batchSize >= uncasedIds.length) {
        photoGroup.value.selectedTotalSize.value = totalSize;
      }

      await Future.delayed(Duration.zero);
    }

    photoGroup.value.selectedTotalSize.value = totalSize; // 确保最终更新总大小
    PhotoManager.clearFileCache();
  }



  void restoreSelections() {


    if(photoGroup.value.images.isEmpty){
      clickBack();
      return;
    }

    isSwiperEnd.value = false;

    if (photoGroup.value.images.isNotEmpty) {
      WidgetsBinding.instance.addPostFrameCallback((_) {
        groupIndex.value = 0;
        cardSwiperController.moveTo(0);
      });
    }
    updateSelectedFilesSize();

  }
  @override
  void onClose() {
    debugPrint('CalendarPreviewController onClose');

    animationController.dispose();
    super.onClose();

    isSwiperEnd.value = false;

    // 清理操作，释放资源
    cardSwiperController.dispose();

    // 清理缓存
    PhotoManager.clearFileCache();
  }


}