import { GuildScheduledEvent, GuildScheduledEventCreateOptions } from "discord.js"
import { RepetitonInfo } from "../../types/scheduledEventTypes"
import { addRepetitonStringToEventDescription, buildNewRepetitionString, createEventInGuild, getRepetitonInfo } from "./helper"

function needsToBeRepeated(rInfo: RepetitonInfo): boolean {
	if (rInfo.endDate) {
		if (new Date() < rInfo.endDate)
			return true
	} else {
		return rInfo.alreadyOccured < rInfo.totalAmount
	}
	return false
}

export function handleRepeatingEvent(oldguildScheduledEvent: GuildScheduledEvent, newguildScheduledEvent: GuildScheduledEvent) {
	if (!oldguildScheduledEvent.description) throw new Error('Event has no description -> cant handle this')
	const repetitionInfo = getRepetitonInfo(oldguildScheduledEvent.description)
	if (needsToBeRepeated(repetitionInfo)) {
		try {

			const newDate = repetitionInfo.schedule.getNewDate(oldguildScheduledEvent.scheduledStartAt)
			if (repetitionInfo.endDate && (repetitionInfo.endDate <= newDate)) {
				console.log(`Wont repeat: EndDate: ${repetitionInfo.endDate} RepetitionDate: ${newDate}`)
				return
			}
			const newRepetitonString = buildNewRepetitionString(repetitionInfo)
			const newEventOptions: GuildScheduledEventCreateOptions = {
				name: oldguildScheduledEvent.name,
				description: addRepetitonStringToEventDescription(oldguildScheduledEvent.description, newRepetitonString),
				scheduledStartTime: newDate,
				privacyLevel: oldguildScheduledEvent.privacyLevel,
				entityType: oldguildScheduledEvent.entityType,
				channel: oldguildScheduledEvent.channel?.id,
				reason: 'Repetition'
			}
			if (!newguildScheduledEvent.guild) throw new Error('No guild on event?')
			createEventInGuild(newguildScheduledEvent.guild, newEventOptions)
		} catch (err) {
			console.error(err)
		}
	} else {
		console.log('Event does not need to be repeated')
	}
}