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/*
 * Copyright Elasticsearch B.V. and/or licensed to Elasticsearch B.V. under one
 * or more contributor license agreements. Licensed under the Elastic License
 * 2.0 and the Server Side Public License, v 1; you may not use this file except
 * in compliance with, at your election, the Elastic License 2.0 or the Server
 * Side Public License, v 1.
 */
package org.elasticsearch.common.rounding;

import org.elasticsearch.ElasticsearchException;
import org.elasticsearch.common.joda.Joda;
import org.joda.time.DateTimeField;
import org.joda.time.DateTimeZone;
import org.joda.time.chrono.ISOChronology;

import java.util.function.Function;

public enum DateTimeUnit {

    WEEK_OF_WEEKYEAR((byte) 1, tz -> ISOChronology.getInstance(tz).weekOfWeekyear()),
    YEAR_OF_CENTURY((byte) 2, tz -> ISOChronology.getInstance(tz).yearOfCentury()),
    QUARTER((byte) 3, tz -> Joda.QuarterOfYear.getField(ISOChronology.getInstance(tz))),
    MONTH_OF_YEAR((byte) 4, tz -> ISOChronology.getInstance(tz).monthOfYear()),
    DAY_OF_MONTH((byte) 5, tz -> ISOChronology.getInstance(tz).dayOfMonth()),
    HOUR_OF_DAY((byte) 6, tz -> ISOChronology.getInstance(tz).hourOfDay()),
    MINUTES_OF_HOUR((byte) 7, tz -> ISOChronology.getInstance(tz).minuteOfHour()),
    SECOND_OF_MINUTE((byte) 8, tz -> ISOChronology.getInstance(tz).secondOfMinute());

    private final byte id;
    private final Function fieldFunction;

    DateTimeUnit(byte id, Function fieldFunction) {
        this.id = id;
        this.fieldFunction = fieldFunction;
    }

    public byte id() {
        return id;
    }

    /**
     * @return the {@link DateTimeField} for the provided {@link DateTimeZone} for this time unit
     */
    public DateTimeField field(DateTimeZone tz) {
        return fieldFunction.apply(tz);
    }

    public static DateTimeUnit resolve(byte id) {
        switch (id) {
            case 1:
                return WEEK_OF_WEEKYEAR;
            case 2:
                return YEAR_OF_CENTURY;
            case 3:
                return QUARTER;
            case 4:
                return MONTH_OF_YEAR;
            case 5:
                return DAY_OF_MONTH;
            case 6:
                return HOUR_OF_DAY;
            case 7:
                return MINUTES_OF_HOUR;
            case 8:
                return SECOND_OF_MINUTE;
            default:
                throw new ElasticsearchException("Unknown date time unit id [" + id + "]");
        }
    }
}