import { timeData } from './time-data.generated';
/**
 * Returns the best matching date time pattern if a date time skeleton
 * pattern is provided with a locale. Follows the Unicode specification:
 * https://www.unicode.org/reports/tr35/tr35-dates.html#table-mapping-requested-time-skeletons-to-patterns
 * @param skeleton date time skeleton pattern that possibly includes j, J or C
 * @param locale
 */
export function getBestPattern(skeleton, locale) {
    var skeletonCopy = '';
    for (var patternPos = 0; patternPos < skeleton.length; patternPos++) {
        var patternChar = skeleton.charAt(patternPos);
        if (patternChar === 'j') {
            var extraLength = 0;
            while (patternPos + 1 < skeleton.length &&
                skeleton.charAt(patternPos + 1) === patternChar) {
                extraLength++;
                patternPos++;
            }
            var hourLen = 1 + (extraLength & 1);
            var dayPeriodLen = extraLength < 2 ? 1 : 3 + (extraLength >> 1);
            var dayPeriodChar = 'a';
            var hourChar = getDefaultHourSymbolFromLocale(locale);
            if (hourChar == 'H' || hourChar == 'k') {
                dayPeriodLen = 0;
            }
            while (dayPeriodLen-- > 0) {
                skeletonCopy += dayPeriodChar;
            }
            while (hourLen-- > 0) {
                skeletonCopy = hourChar + skeletonCopy;
            }
        }
        else if (patternChar === 'J') {
            skeletonCopy += 'H';
        }
        else {
            skeletonCopy += patternChar;
        }
    }
    return skeletonCopy;
}
/**
 * Maps the [hour cycle type](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Intl/Locale/hourCycle)
 * of the given `locale` to the corresponding time pattern.
 * @param locale
 */
function getDefaultHourSymbolFromLocale(locale) {
    var hourCycle = locale.hourCycle;
    if (hourCycle === undefined &&
        // @ts-ignore hourCycle(s) is not identified yet
        locale.hourCycles &&
        // @ts-ignore
        locale.hourCycles.length) {
        // @ts-ignore
        hourCycle = locale.hourCycles[0];
    }
    if (hourCycle) {
        switch (hourCycle) {
            case 'h24':
                return 'k';
            case 'h23':
                return 'H';
            case 'h12':
                return 'h';
            case 'h11':
                return 'K';
            default:
                throw new Error('Invalid hourCycle');
        }
    }
    // TODO: Once hourCycle is fully supported remove the following with data generation
    var languageTag = locale.language;
    var regionTag;
    if (languageTag !== 'root') {
        regionTag = locale.maximize().region;
    }
    var hourCycles = timeData[regionTag || ''] ||
        timeData[languageTag || ''] ||
        timeData["".concat(languageTag, "-001")] ||
        timeData['001'];
    return hourCycles[0];
}