import { format, isToday, toDate } from "date-fns";
import {utcToZonedTime} from "date-fns-tz"
import { GuildScheduledEvent } from "discord.js";
import { logger } from "../logger";
import de from "date-fns/locale/de";

export function createDateStringFromEvent(event: GuildScheduledEvent, requestId: string, guildId?: string): string {
    if(!event.scheduledStartAt) {
        logger.error("Event has no start. Cannot create dateString.", {guildId, requestId})
        return `"habe keinen Startzeitpunkt ermitteln können"`
    }

    const timeZone = 'Europe/Berlin'
    const zonedDateTime = utcToZonedTime(event.scheduledStartAt, timeZone)
    const time = format(zonedDateTime, "HH:mm", {locale: de})
    
    if(isToday(zonedDateTime)) {
        return `heute um ${time}`
    }

    const date = format(zonedDateTime, "eeee dd.MM", {locale: de})
    return `am ${date} um ${time}`
}