import { DateTime } from "luxon";

const MONTHS = {
    January: 0,
    February: 1,
    March: 2,
    April: 3,
    May: 4,
    June: 5,
    July: 6,
    August: 7,
    September: 8,
    October: 9,
    November: 10,
    December: 11
};

/*
    sorts the months by their date heading, for example:
    {
        "February 2022": [ *array of dates for this month* ],
        "January 2022": [ *array of dates for this month* ],
    }
*/
export function sortSplittedPostsByMonth(postsByMonth: any) {
    const sortedPostsByMonth: { [key: string]: Array<{}> } = {};

    Object.keys(postsByMonth)
        .sort((a, b) => {
            const [aMonth, aYear] = a.split(" ");
            const [bMonth, bYear] = b.split(" ");

            if (aYear < bYear) {
                return 1;
            } else if (aYear > bYear) {
                return -1;
            } else if (
                MONTHS[aMonth as keyof typeof MONTHS] <
                MONTHS[bMonth as keyof typeof MONTHS]
            ) {
                return 1;
            } else if (
                MONTHS[aMonth as keyof typeof MONTHS] >
                MONTHS[bMonth as keyof typeof MONTHS]
            ) {
                return -1;
            }
            return 0;
        })
        .forEach((key) => {
            sortedPostsByMonth[key] = [
                ...postsByMonth[key].sort((a: any, b: any) => {
                    const aDate = new Date(a.date);
                    const bDate = new Date(b.date);

                    if (aDate < bDate) {
                        return 1;
                    } else if (aDate > bDate) {
                        return -1;
                    }
                    return 0;
                })
            ];
        });

    return sortedPostsByMonth;
}

export function convertForDaylightSavings(utcIsoString: string) {
    const utcDate = DateTime.fromISO(utcIsoString, { zone: "utc" });
    return utcDate.toLocal();
}