// ignore_for_file: unnecessary_null_comparison, unused_element

import 'dart:io';

import 'package:flutter/cupertino.dart';
import 'package:flutter_cache_manager/flutter_cache_manager.dart'
    show DefaultCacheManager;
import 'package:hgdj/tools_base/image/image_data_handle/image_cache_disk.dart';
import 'package:hgdj/tools_base/image/image_data_handle/image_manager.dart';
import 'package:hgdj/tools_base/video_download/video_download_manager.dart';
import 'package:path/path.dart' as path;
import 'package:path_provider/path_provider.dart';

import '../../hj_utils/file_util.dart';
import '../../hj_utils/video_cache_manager.dart';
import 'image_cache_manager.dart';

///加载缓存 统计缓存大小
Future<String> loadCache() async {
  double total = 0;
  Directory videoCacheDir =
      Directory(await VideoCacheManager().getFilePath() ?? '');
  if (await videoCacheDir.exists()) {
    total += await _getTotalSizeOfFilesInDir(videoCacheDir);
  }
  Directory videoLoadedDir =
      Directory(await VideoDownloadManager.instance.cacheDir());
  if (await videoLoadedDir.exists()) {
    total += await _getTotalSizeOfFilesInDir(videoLoadedDir);
  }

  // 图片磁盘缓存(ImageCacheDisk)
  Directory imageDiskCacheDir = Directory(await ImageCacheDisk.findSavePath());
  if (await imageDiskCacheDir.exists()) {
    total += await _getTotalSizeOfFilesInDir(imageDiskCacheDir);
  }

  // CachedNetworkImage 缓存(ImageCacheManager)
  Directory imageCacheDir = Directory(await ImageCacheManager().getFilePath());
  if (await imageCacheDir.exists()) {
    total += await _getTotalSizeOfFilesInDir(imageCacheDir);
  }

  // NetworkImageLoader 在 encrypt:false 时(直播封面)走 DefaultCacheManager，目录单独统计
  Directory defaultImageCacheDir = Directory(await _defaultImageCacheDirPath());
  if (await defaultImageCacheDir.exists()) {
    total += await _getTotalSizeOfFilesInDir(defaultImageCacheDir);
  }

  return FileUtil.byteFmt(total.toInt());
}

/// DefaultCacheManager 的磁盘目录：临时目录下的 'libCachedImageData'(flutter_cache_manager 默认 key)
Future<String> _defaultImageCacheDirPath() async {
  final dir = await getTemporaryDirectory();
  return path.join(dir.path, 'libCachedImageData');
}

Future<double> _getTotalSizeOfFilesInDir(final FileSystemEntity file) async {
  try {
    if (file is File) {
      return (await file.length()).toDouble();
    }
    if (file is Directory && await file.exists()) {
      double total = 0;
      // recursive 已一次性列出所有后代文件，只累加 File 即可；不再对子目录二次递归，
      // 避免同一文件被重复计入导致缓存大小翻倍。异步 list 替代 listSync，避免大目录阻塞 UI。
      await for (final child
          in file.list(recursive: true, followLinks: false)) {
        if (child is File) {
          total += (await child.length()).toDouble();
        }
      }
      return total;
    }
  } catch (e) {
    return 0;
  }
  return 0;
}

// 手动清理缓存
Future handleClearAllCache() async {
  await VideoDownloadManager.instance.emptyCache();
  await ImageCacheDisk.emptyCache();
  await VideoCacheManager().emptyCache();
  await ImageCacheManager().emptyCache();
  await DefaultCacheManager().emptyCache(); // 直播封面(encrypt:false)走的默认缓存
}

/// 清除缓存如果必要
/// [force] 强至清除
Future clearCacheIfNeed({bool force = false, bool isHandle = false}) async {
  if (force) {
    await VideoCacheManager().emptyCache();
    // await VideoSubCacheManager().emptyCache();
    // CachedVideoStore().clean();
    await ImageCacheManager().emptyCache();
    if (isHandle) {
      //await VideoDownloadManager.instance.emptyCache();
      // await ImageCacheDisk.emptyCache();
    }
    debugPrint(
        " ------------------ VideoCacheManager  ImageCacheManager    clear completely");
  } else {
    double total = 0;
    Directory videoCacheDir =
        Directory(await VideoCacheManager().getFilePath() ?? '');
    if (await videoCacheDir.exists()) {
      total += await _getTotalSizeOfFilesInDir(videoCacheDir);
    }
    //ts流最大2M，应该是>1000个ts流
    if (total > 500 * MB_SIZE) {
      await VideoCacheManager().emptyCache();
    }
    total = 0;
    Directory imageCacheDir =
        Directory(await ImageCacheManager().getFilePath());
    if (await imageCacheDir.exists()) {
      total += await _getTotalSizeOfFilesInDir(imageCacheDir);
    }
    //按照100Kb一张图片的化，估计是5000张网络图片
    if (total > 500 * MB_SIZE) {
      await ImageCacheManager().emptyCache();
    }
  }
}

clearAllCache(bool isHandle) async {
  //await clearCacheIfNeed(force: true,isHandle: isHandle);

  ImageManager.instance.clearBySize(maxSize: 1000);
  PaintingBinding.instance.imageCache.clear();
  PaintingBinding.instance.imageCache.clearLiveImages();

  debugPrint(
      " ----------- PaintingBinding.instance.imageCache.clearLiveImages()");
}

///递归方式删除目录
Future<Null> delDir(FileSystemEntity file) async {
  try {
    if (file is Directory) {
      final List<FileSystemEntity> children = file.listSync();
      for (final FileSystemEntity child in children) {
        await delDir(child);
      }
    }
    await file.delete();
  } catch (e) {}
}