import 'dart:io';

import 'package:appframe/services/dispatcher.dart';
import 'package:appframe/utils/file_type_util.dart';
import 'package:appframe/utils/thumbnail_util.dart';
import 'package:file_picker/file_picker.dart';
import 'package:image_size_getter/file_input.dart';
import 'package:image_size_getter/image_size_getter.dart';
import 'package:path/path.dart' as path;
import 'package:path_provider/path_provider.dart';

class ChooseFileHandler extends MessageHandler {
  @override
  Future<dynamic> handleMessage(dynamic params) async {
    if (params is! Map<String, dynamic>) {
      throw Exception('参数错误');
    }

    var count = params['count'] as int;
    var fileTypes = params['fileTypes'] as List<dynamic>;

    FilePickerResult? filePickerResult = await FilePicker.platform.pickFiles(
      type: FileType.custom,
      allowedExtensions: fileTypes.map((e) => e.toString()).toList(),
      allowMultiple: count > 1,
    );

    // 用户取消选择，返回空数组
    if (filePickerResult == null) {
      return [];
    }

    // 限制最多count个文件
    if (filePickerResult.files.length > count) {
      filePickerResult.files.removeRange(count, filePickerResult.files.length);
    }

    final List<Map<String, dynamic>> result = [];
    for (var file in filePickerResult.files) {
      result.add(await _handleFile(file));
    }

    return result;
  }

  Future<Map<String, dynamic>> _handleFile(PlatformFile file) async {
    // 获取临时目录
    final tempDir = await getTemporaryDirectory();

    // 临时文件路径
    final uniqueFileName = '${DateTime.now().millisecondsSinceEpoch}_${file.name}';
    final tempFilePath = path.join(tempDir.path, uniqueFileName);

    // 复制
    final originalFile = File(file.path!);
    final copiedFile = await originalFile.copy(tempFilePath);

    bool isImage = await FileTypeUtil.isImage(copiedFile);
    bool isVideo = false;
    if (!isImage) {
      isVideo = await FileTypeUtil.isVideo(copiedFile);
    }

    // 通过image_size_getter获取图片尺寸
    SizeResult? sizeResult;
    String? thumbTempFilePath;
    if (isImage) {
      sizeResult = ImageSizeGetter.getSizeResult(FileInput(copiedFile));
      thumbTempFilePath = await ThumbnailUtil.genTempThumbnail(copiedFile, tempDir);
    }
    if (isVideo) {
      thumbTempFilePath = await ThumbnailUtil.genVideoThumbnail(copiedFile.path, tempDir);
    }

    // 返回临时文件信息
    return {
      'tempFilePath': tempFilePath,
      'size': file.size,
      'width': sizeResult != null ? sizeResult.size.width : '',
      'height': sizeResult != null ? sizeResult.size.height : '',
      'thumbTempFilePath': thumbTempFilePath ?? '',
      'fileType': copiedFile.path.split('/').last.split('.').last,
    };
  }
}