/*
 * Copyright 2022 Palantir Technologies, Inc. All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import { format, type Locale, parse } from "date-fns";
import * as Locales from "date-fns/locale";

import type { DateFormatProps } from "./dateFormatProps";

export const DATE_FORMAT = getDateFnsFormatter("M/d/yyyy");
export const DATETIME_FORMAT = getDateFnsFormatter("M/d/yyyy HH:mm:ss");

function getDateFnsFormatter(formatStr: string): DateFormatProps {
    return {
        formatDate: (date, localeCode) => format(date, formatStr, maybeGetLocaleOptions(localeCode)),
        parseDate: (str, localeCode) => parse(str, formatStr, new Date(), maybeGetLocaleOptions(localeCode)),
        placeholder: `${formatStr}`,
    };
}

function maybeGetLocaleOptions(localeCode: string | undefined): { locale: Locale } | undefined {
    if (localeCode !== undefined) {
        const localeMap = Locales as unknown as Record<string, Locale>;
        if (localeMap[localeCode] !== undefined) {
            return { locale: localeMap[localeCode] };
        }
    }
    return undefined;
}