import { createEvents, createEvent, EventStatus } from 'ics'
import { Booking, BookingStatus} from '@prisma/client';
import { getBaseURL } from './url'
import { dateFormatFrontend, getDayCount } from './date'

function convertDay(value: string): [number, number, number] {
  const parts = value.split('-')
  if (parts.length !== 3) {
    throw new Error('faile converting day')
  }
  return [Number(parts[0]), Number(parts[1]), Number(parts[2])]
}

export function generateCalendarEntry(booking: Booking): string {
  const { error, value } = createEvent({
    productId: 'app.vercel.pfadi-bussle/ics',
    title: `Pfadi-Bussle Buchung`,
    start: convertDay(booking.startDate),
    startOutputType: 'local',
    duration: { days: getDayCount(booking) },
    location: 'Mömpelgardgasse 25, 72348 Rosenfeld, Deutschland',
    geo: { lat: 48.287044, lon: 8.726361 },
    description: `Gebucht auf ${booking.name}

Buchungs-Link: ${getBaseURL()}/bookings/${booking.uuid}
`,
    status:
      booking.status === BookingStatus.CONFIRMED
        ? ('CONFIRMED' as EventStatus)
        : ('TENTATIVE' as EventStatus),
  })

  if (error) {
    throw error
  }

  return value
}

export function generateBookedCalendar(bookings: Booking[]): string {
  const events = bookings.map(
    (
      booking
    ): {
      productId: string
      calName: string
      start: [number, number, number]
      startOutputType: 'local' | 'utc'
      duration: { days: number }
      title: string
      description: string
      status: EventStatus
    } => ({
      productId: 'app.vercel.pfadi-bussle/ics',
      calName: 'Pfadi-Bussle Buchungen',
      start: convertDay(booking.startDate),
      startOutputType: 'local',
      duration: { days: getDayCount(booking) },
      title: `Buchung ${booking.name}`,
      description: `Name: ${booking.name}
Zeitraum: ${dateFormatFrontend(new Date(booking.startDate))}-${dateFormatFrontend(new Date(booking.endDate))}

Email: ${booking.email}
Telefon: ${booking.phone}

Link: ${getBaseURL()}/admin/bookings/${booking.uuid}
`,
      status:
        booking.status === BookingStatus.CONFIRMED
          ? ('CONFIRMED' as EventStatus)
          : ('TENTATIVE' as EventStatus),
    })
  )

  const { error, value } = createEvents(events)

  if (error) {
    throw error
  }

  return value
}