'use server'
import { env } from '~/env'
import { getGoogleCalendarClient, getGoogleCalendarId } from '~/server/googleCalendar'

function googleCalendarDate(date: Date) {
	return date.toISOString().replace(/[-:]|\.\d{3}/g, '')
}

function createGoogleCalendarTemplateLink({
	title,
	description,
	startTime,
	endTime,
	gregorEmail,
}: {
	title: string
	description: string
	startTime: Date
	endTime: Date
	gregorEmail: string
}) {
	const params = new URLSearchParams({
		action: 'TEMPLATE',
		text: title,
		dates: `${googleCalendarDate(startTime)}/${googleCalendarDate(endTime)}`,
		details: description,
		add: gregorEmail,
	})

	return `https://calendar.google.com/calendar/render?${params.toString()}`
}

export async function scheduleMeeting({
	title,
	description,
	dateTime,
	durationMinutes,
	attendeeEmail,
	attendeeName,
}: {
	title: string
	description: string
	dateTime: string
	durationMinutes: number
	attendeeEmail?: string
	attendeeName?: string
}) {
	try {
		const calendar = getGoogleCalendarClient()

		const startTime = new Date(dateTime)
		const endTime = new Date(startTime.getTime() + durationMinutes * 60 * 1000)
		const attendeeNote = attendeeEmail
			? `\n\nVisitor: ${attendeeName ?? 'Unknown'} <${attendeeEmail}>`
			: ''
		const eventDescription = `${description}${attendeeNote}`

		const eventRequest = {
			summary: title,
			description: eventDescription,
			start: { dateTime: startTime.toISOString(), timeZone: 'UTC' },
			end: { dateTime: endTime.toISOString(), timeZone: 'UTC' },
		}
		const event = await calendar.events.insert({
			calendarId: getGoogleCalendarId(),
			requestBody: eventRequest,
		})

		const addToCalendarLink = createGoogleCalendarTemplateLink({
			title,
			description,
			startTime,
			endTime,
			gregorEmail: env.GREGOR_MEETING_EMAIL,
		})

		return {
			success: true,
			eventId: event.data.id,
			addToCalendarLink,
			message: `Meeting "${title}" scheduled for ${startTime.toLocaleString()}.${attendeeEmail ? ` Visitor email noted: ${attendeeEmail}.` : ''} The add-to-calendar link invites ${env.GREGOR_MEETING_EMAIL}.`,
		}
	} catch (error) {
		console.error('Failed to schedule meeting:', error)
		return { success: false, error: 'Failed to schedule meeting. Please try again.' }
	}
}