import 'package:app_client/shared/models/video_asset_preview.dart';
import 'package:intl/intl.dart';

class CalendarHelpers{

  static String _formatDateTime(DateTime dateTime) {
    final DateFormat formatter = DateFormat('yyyyMMddTHHmmss');
    return '${formatter.format(dateTime)}Z';
  }

  static String createICalString(VideoAssetPreview mediaAsset){
    String eventName =  mediaAsset.name;
    DateTime eventStart = mediaAsset.localStartTime;
    DateTime eventEnd =  mediaAsset.localStartTime.add(const Duration(minutes: 30));
    String location = mediaAsset.providerName;

    // Create the iCal content
    final StringBuffer icalContent = StringBuffer()
      ..writeln('BEGIN:VCALENDAR')
      ..writeln('VERSION:2.0')
      ..writeln('PRODID:-//Xfinity//Xfinity Rewards//EN')
      ..writeln('BEGIN:VEVENT')
      ..writeln('UID:${DateTime.now().millisecondsSinceEpoch}@comcast.com')
      ..writeln('DTSTAMP:${_formatDateTime(DateTime.now().toUtc())}')
      ..writeln('DTSTART:${_formatDateTime(eventStart.toUtc())}')
      ..writeln('DTEND:${_formatDateTime(eventEnd.toUtc())}')
      ..writeln('LOCATION:$location')
      ..writeln('SUMMARY:$eventName')
      ..writeln('END:VEVENT')
      ..writeln('END:VCALENDAR');

    return icalContent.toString().trim().replaceAll('\n', '\r\n');
  }
}


// 
void addCalendarEvent(String calendarString) {
  // Convert the iCal content to a Blob
  final bytes = utf8.encode(calendarString);
  final blob = Blob([bytes], 'text/calendar');

  // Create a URL for the Blob
  final url = Url.createObjectUrlFromBlob(blob);

  //Create an anchor element and set its href to the Blob URL
  final anchor = AnchorElement(href: url)
    ..setAttribute('download', 'event.ics')
    ..click();

  //Revoke the Blob URL to free up memory
  Url.revokeObjectUrl(url);
}