import { addDays, format, isAfter } from "date-fns";
import toDate from "date-fns/fp/toDate";
import { GuildScheduledEvent, Message, MessageCreateOptions, TextChannel } from "discord.js";
import { ScheduledTask, schedule } from "node-cron";
import { v4 as uuid } from "uuid";
import { client, yavinJellyfinHandler } from "../..";
import { closePoll } from "../commands/closepoll";
import { config } from "../configuration";
import { Maybe } from "../interfaces";
import { logger } from "../logger";


export const name = 'guildScheduledEventCreate'

export enum Emotes { "1️⃣", "2️⃣", "3️⃣", "4️⃣", "5️⃣", "6️⃣", "7️⃣", "8️⃣", "9️⃣", "🔟" }

export let task: ScheduledTask | undefined

export async function execute(event: GuildScheduledEvent) {
    const requestId = uuid()
    logger.debug(`New event created: ${JSON.stringify(event, null, 2)}`, { guildId: event.guildId, requestId })

    if (event.name.toLowerCase().includes("!nextwp")) {
        logger.info("Event was a placeholder event to start a new watchparty and voting. Creating vote!", { guildId: event.guildId, requestId })
        logger.debug("Renaming event", { guildId: event.guildId, requestId })
        event.edit({ name: "Watchparty - Voting offen" })
        const movies = await yavinJellyfinHandler.getRandomMovies(5, event.guildId, requestId)

        logger.info(`Got ${movies.length} random movies. Creating voting`, { guildId: event.guildId, requestId })
        logger.debug(`Movies: ${JSON.stringify(movies.map(movie => movie.name))}`, { guildId: event.guildId, requestId })

        const announcementChannel: Maybe<TextChannel> = client.getAnnouncementChannelForGuild(event.guildId)
        if(!announcementChannel) {
            logger.error("Could not find announcement channel. Aborting", { guildId: event.guildId, requestId })
            return
        }
        logger.debug(`Found channel ${JSON.stringify(announcementChannel, null, 2)}`, { guildId: event.guildId, requestId })

        if(!event.scheduledStartAt) {
            logger.info("EVENT DOES NOT HAVE STARTDATE; CANCELLING", {guildId: event.guildId, requestId})
            return
        }
        const date = format(event.scheduledStartAt, "dd.MM")
        const time = format(event.scheduledStartAt, "HH:mm")
        let message = `[Abstimmung]\n<@&${config.bot.announcement_role}> Es gibt eine neue Abstimmung für die nächste Watchparty am ${date} um ${time}}! Stimme hierunter für den nächsten Film ab!\n`

        for (let i = 0; i < movies.length; i++) {
            message = message.concat(Emotes[i]).concat(": ").concat(movies[i].name ?? "Film hatte keinen Namen :(").concat("\n")
        }

        const options: MessageCreateOptions = {
            allowedMentions: { parse: ["roles"]},
            content: message
        }

        const sentMessage: Message<true> = await (await announcementChannel.fetch()).send(options)

        for (let i = 0; i < movies.length; i++) {
            sentMessage.react(Emotes[i])
        }

        if (!task) {
            task = schedule("0 * * * * *", () => checkForPollsToClose(event))
        }

        // sentMessage.pin() //todo: uncomment when bot has permission to pin messages. Also update closepoll.ts to only fetch pinned messages
    }
}

async function checkForPollsToClose(event: GuildScheduledEvent): Promise<void> {
    const requestId = uuid()
    logger.info(`Automatic check for poll closing.`, { guildId: event.guildId, requestId })
    if (!event.guild) {
        logger.error("No guild in event. Cancelling.", { guildId: event.guildId, requestId })
        return
    }
    //refetch event in case the time changed or the poll is already closed
    const events = (await event.guild.scheduledEvents.fetch())
        .filter(event => event.name.toLowerCase().includes("voting offen"))
        .map((value) => value)

    if (!events || events.length <= 0) {
        logger.info("Did not find any events. Cancelling", { guildId: event.guildId, requestId })
        return
    } else if (events.length > 1) {
        logger.error(`More than one event found. Don't know which one is the right one :( Events: ${JSON.stringify(events, null, 2)}`, { guildId: event.guildId, requestId })
        return
    }
    const updatedEvent = events[0]             //add two hours because of different timezones in discord api and Date.now()
    if (!updatedEvent.scheduledStartTimestamp) {
        logger.error("Event does not have a scheduled start time. Cancelling", { guildId: event.guildId, requestId })
        return
    }

    const eventDate: Date = toDate(updatedEvent.scheduledStartTimestamp)
    const closePollDate: Date = addDays(eventDate, -2)

    if (isAfter(Date.now(), closePollDate)) {
        logger.info("Less than two days until event. Closing poll", { guildId: event.guildId, requestId })
        closePoll(event.guild, requestId)
    } else {
        logger.info(`ScheduledStart: ${closePollDate}. Now: ${toDate(Date.now())}`, { guildId: event.guildId, requestId })
    }
}