import { createEvents, createEvent, EventStatus } from 'ics'
import { Booking } from '../db/booking'
import { BOOKING_STATUS } from '../db/enums'
import { getBaseURL } from './url'
import { daysFormatFrontend } 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.days[0]),
    startOutputType: 'local',
    duration: { days: booking.days.length },
    location: 'Mömpelgardgasse 25, 72348 Rosenfeld, Deutschland',
    geo: { lat: 48.287044, lon: 8.726361 },
    description: `Gebucht auf ${booking.booker.name}

Buchungs-Link: ${getBaseURL()}/booking/${booking.uuid}
`,
    status:
      booking.status === BOOKING_STATUS.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.days[0]),
    startOutputType: 'local',
    duration: { days: booking.days.length },
    title: `Buchung ${booking.booker.name}`,
    description: `Name: ${booking.booker.name}
Zeitraum: ${daysFormatFrontend(booking.days)}

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

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

  const { error, value } = createEvents(events)

  if (error) {
    throw error
  }

  return value
}