import { format, addHours } from "date-fns";
import { TZDate } from "@date-fns/tz";
import { UTCDate, utc } from "@date-fns/utc";
import spacetime from "spacetime";

export function dateFromInput(input: { dateQuery: string, timezone: string }) {
    console.log(`Looking for ${input.dateQuery} in ${input.timezone}`);


    let t: string;
    if (input.dateQuery == "today") {
        t = spacetime(input.dateQuery, input.timezone).format("yyyy-MM-dd");
        return t;
    }
    else {
        t = new UTCDate(input.dateQuery);
        return format(t, "yyyy-MM-dd", { in: utc });
    }

}

function generateHour(d, t) {
    const dt: TZDate = addHours(d, t);
    console.log(dt);
    return {
        date: format(dt, 'yyyy-MM-dd'),
        time: parseInt(format(dt, 'H')),
    };
}

export function hoursListInUTC(input: { dateQuery: string, timezone: string }) {
    const midnight = spacetime(input.dateQuery, input.timezone).time('00:00');
    const hours = Array.from({ length: 24 }, function (_, i) {
        const utcMoment = midnight.add(i, 'hour').goto('UTC');
        return { date: utcMoment.format('hh'), time: utcMoment.hour() };
    });
    return hours;
}