import { google } from 'googleapis'
import { DateTime } from 'luxon'
import { service } from '../service'
import { googleAuthService } from './googleAuth'

export type CalendarService = Awaited<
	ReturnType<ReturnType<typeof calendarService>>
>

export const calendarService = service((ctx) => async () => {
	const googleAuth = await googleAuthService(ctx)()
	const auth = await googleAuth.getAuth()
	const calendar = google.calendar({ version: 'v3', auth })

	return {
		calendars: async () => {
			const calendars = await calendar.calendarList.list()

			return calendars.data.items
		},

		events: async (calendars: string[]) => {
			const results = []
			const timeMin = DateTime.now().setZone(ctx.config.timeZone).startOf('day')
			const timeMax = DateTime.now().setZone(ctx.config.timeZone).endOf('day')

			if (!timeMin.isValid) {
				throw new Error('Invalid time')
			}

			if (!timeMax.isValid) {
				throw new Error('Invalid time')
			}

			for (const calendarId of calendars) {
				const res = await calendar.events.list({
					calendarId,
					timeMin: timeMin.toISO(),
					timeMax: timeMax.toISO(),
					maxResults: 10,
					singleEvents: true,
					orderBy: 'startTime',
				})

				if (res.data.items) {
					results.push(...res.data.items)
				}
			}

			return results
		},
	}
})