fluffychat/lib/utils/matrix_sdk_extensions/matrix_file_extension.dart

import 'dart:io';

import 'package:flutter/material.dart';

import 'package:file_picker/file_picker.dart';
import 'package:file_selector/file_selector.dart';
import 'package:matrix/matrix.dart';
import 'package:share_plus/share_plus.dart';
import 'package:universal_html/html.dart' as html;

import 'package:fluffychat/l10n/l10n.dart';
import 'package:fluffychat/utils/platform_infos.dart';
import 'package:fluffychat/utils/size_string.dart';
import 'package:fluffychat/widgets/future_loading_dialog.dart';

extension MatrixFileExtension on MatrixFile {
  void save(BuildContext context) async {
    if (PlatformInfos.isWeb) {
      _webDownload();
      return;
    }

    final downloadPath = !PlatformInfos.isMobile
        ? (await getSaveLocation(
            suggestedName: name,
            confirmButtonText: L10n.of(context).saveFile,
          ))
            ?.path
        : await FilePicker.platform.saveFile(
            dialogTitle: L10n.of(context).saveFile,
            fileName: name,
            type: filePickerFileType,
            bytes: bytes,
          );
    if (downloadPath == null) return;

    if (PlatformInfos.isDesktop) {
      final result = await showFutureLoadingDialog(
        context: context,
        future: () => File(downloadPath).writeAsBytes(bytes),
      );
      if (result.error != null) return;
    }

    ScaffoldMessenger.of(context).showSnackBar(
      SnackBar(
        content: Text(
          L10n.of(context).fileHasBeenSavedAt(downloadPath),
        ),
      ),
    );
  }

  FileType get filePickerFileType {
    if (this is MatrixImageFile) return FileType.image;
    if (this is MatrixAudioFile) return FileType.audio;
    if (this is MatrixVideoFile) return FileType.video;
    return FileType.any;
  }

  void _webDownload() {
    html.AnchorElement(
      href: html.Url.createObjectUrlFromBlob(
        html.Blob(
          [bytes],
          mimeType,
        ),
      ),
    )
      ..download = name
      ..click();
  }

  void share(BuildContext context) async {
    // Workaround for iPad from
    // https://github.com/fluttercommunity/plus_plugins/tree/main/packages/share_plus/share_plus#ipad
    final box = context.findRenderObject() as RenderBox?;

    await SharePlus.instance.share(
      ShareParams(
        files: [XFile.fromData(bytes, name: name, mimeType: mimeType)],
        sharePositionOrigin:
            box == null ? null : box.localToGlobal(Offset.zero) & box.size,
      ),
    );
    return;
  }

  MatrixFile get detectFileType {
    if (msgType == MessageTypes.Image) {
      return MatrixImageFile(bytes: bytes, name: name);
    }
    if (msgType == MessageTypes.Video) {
      return MatrixVideoFile(bytes: bytes, name: name);
    }
    if (msgType == MessageTypes.Audio) {
      return MatrixAudioFile(bytes: bytes, name: name);
    }
    return this;
  }

  String get sizeString => size.sizeString;
}