fairnesscoop / permacoop

@QueryHandler(GetLeavesCalendarQuery)

export class GetLeavesCalendarQueryHandler {

  constructor(

    @Inject('IDateUtils')

    private readonly dateUtils: IDateUtils,

    @Inject('ILeaveRequestRepository')

    private readonly leaveRequestRepository: ILeaveRequestRepository

  ) {}

  async execute(query: GetLeavesCalendarQuery): Promise<string> {

    const leaveRequests = await this.leaveRequestRepository.findAcceptedLeaveRequests();

    // See: https://www.rfc-editor.org/rfc/rfc5545

    const lines = [

      'BEGIN:VCALENDAR',

      'VERSION:2.0',

      'PRODID:-//Fairness//Permacoop//FR',

      'CALSCALE:GREGORIAN',

      'X-WR-CALNAME:Congés Fairness',

      'X-APPLE-CALENDAR-COLOR:#00CA9E'

    ];

    leaveRequests.forEach(leaveRequest => {

      // See https://www.rfc-editor.org/rfc/rfc5545#section-3.6.1

      // DTSTART is inclusive, and DTEND is non-inclusive.

      // But we store leave request dates as inclusive on both ends.

      const inclusiveStartDate = new Date(leaveRequest.getStartDate());

      const inclusiveEndDate = new Date(leaveRequest.getEndDate());

      const nonInclusiveEndDate = this.dateUtils.addDaysToDate(

        inclusiveEndDate,

        1

      );

      lines.push(

        'BEGIN:VEVENT',

        `DTSTART;VALUE=DATE:${this.dateUtils.format(

          inclusiveStartDate,

          'yyyyMMdd'

        )}`,

        `DTEND;VALUE=DATE:${this.dateUtils.format(

          nonInclusiveEndDate,

          'yyyyMMdd'

        )}`,

        `SUMMARY:Congés ${leaveRequest.getUser().getFullName()}`,

        'END:VEVENT'

      );

    });

    lines.push('END:VCALENDAR');

    return lines.join('\r\n');