import 'dart:html' as html;

import 'package:http/http.dart' as http;

import 'download_result.dart';
import 'file_download_common.dart';

Future<DownloadResult> downloadFileFromUrlImpl(
  String url, {
  String? fileName,
  Map<String, String>? headers,
  bool openAfterDownload = false,
}) async {
  try {
    final name = fileName ?? fileNameFromUrl(url);
    final response = await http.get(Uri.parse(url), headers: headers);
    if (response.statusCode != 200) {
      return DownloadResult.failure(
        'Download failed (${response.statusCode})',
      );
    }

    final blob = html.Blob([response.bodyBytes]);
    final objectUrl = html.Url.createObjectUrlFromBlob(blob);
    final anchor = html.AnchorElement(href: objectUrl)
      ..download = name
      ..style.display = 'none';
    html.document.body?.append(anchor);
    anchor.click();
    anchor.remove();
    html.Url.revokeObjectUrl(objectUrl);

    return DownloadResult.success(message: 'E-Card downloaded');
  } catch (_) {
    try {
      final name = fileName ?? fileNameFromUrl(url);
      final anchor = html.AnchorElement(href: url)
        ..download = name
        ..style.display = 'none';
      html.document.body?.append(anchor);
      anchor.click();
      anchor.remove();
      return DownloadResult.success(message: 'E-Card download started');
    } catch (e) {
      return DownloadResult.failure('Could not download file');
    }
  }
}