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/*

 * Copyright (c) 2012, Stephen Colebourne & Michael Nascimento Santos

 *

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 *  * Redistributions of source code must retain the above copyright notice,

 *    this list of conditions and the following disclaimer.

 *

 *  * Redistributions in binary form must reproduce the above copyright notice,

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 *    and/or other materials provided with the distribution.

 *

 *  * Neither the name of JSR-310 nor the names of its contributors

 *    may be used to endorse or promote products derived from this software

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 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS

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package java.time.calendar;

import static java.time.temporal.ChronoField.YEAR;

import java.io.Serializable;

import java.time.DateTimeException;

import java.time.LocalDate;

import java.time.temporal.Chrono;

import java.time.temporal.ChronoField;

import java.time.temporal.ChronoLocalDate;

import java.time.temporal.Era;

import java.time.temporal.ISOChrono;

import java.time.temporal.TemporalAccessor;

import java.time.temporal.ValueRange;

import java.util.Arrays;

import java.util.HashMap;

import java.util.List;

import java.util.Locale;

/**

 * The Thai Buddhist calendar system.

 * <p>

 * This chronology defines the rules of the Thai Buddhist calendar system.

 * This calendar system is primarily used in Thailand.

 * Dates are aligned such that {@code 2484-01-01 (Buddhist)} is {@code 1941-01-01 (ISO)}.

 * <p>

 * The fields are defined as follows:

 * <p><ul>

 * <li>era - There are two eras, the current 'Buddhist' (ERA_BE) and the previous era (ERA_BEFORE_BE).

 * <li>year-of-era - The year-of-era for the current era increases uniformly from the epoch at year one.

 *  For the previous era the year increases from one as time goes backwards.

 *  The value for the current era is equal to the ISO proleptic-year plus 543.

 * <li>proleptic-year - The proleptic year is the same as the year-of-era for the

 *  current era. For the previous era, years have zero, then negative values.

 *  The value is equal to the ISO proleptic-year plus 543.

 * <li>month-of-year - The ThaiBuddhist month-of-year exactly matches ISO.

 * <li>day-of-month - The ThaiBuddhist day-of-month exactly matches ISO.

 * <li>day-of-year - The ThaiBuddhist day-of-year exactly matches ISO.

 * <li>leap-year - The ThaiBuddhist leap-year pattern exactly matches ISO, such that the two calendars

 *  are never out of step.

 * </ul><p>

 *

 * <h3>Specification for implementors</h3>

 * This class is immutable and thread-safe.

 *

 * @since 1.8

 */

public final class ThaiBuddhistChrono extends Chrono<ThaiBuddhistChrono> implements Serializable {

    /**

     * Singleton instance of the Buddhist chronology.

     */

    public static final ThaiBuddhistChrono INSTANCE = new ThaiBuddhistChrono();

    /**

     * The singleton instance for the era before the current one - Before Buddhist -

     * which has the value 0.

     */

    public static final Era<ThaiBuddhistChrono> ERA_BEFORE_BE = ThaiBuddhistEra.BEFORE_BE;

    /**

     * The singleton instance for the current era - Buddhist - which has the value 1.

     */

    public static final Era<ThaiBuddhistChrono> ERA_BE = ThaiBuddhistEra.BE;

    /**

     * Serialization version.

     */

    private static final long serialVersionUID = 2775954514031616474L;

    /**

     * Containing the offset to add to the ISO year.

     */

    static final int YEARS_DIFFERENCE = 543;

    /**

     * Narrow names for eras.

     */

    private static final HashMap<String, String[]> ERA_NARROW_NAMES = new HashMap<>();

    /**

     * Short names for eras.

     */

    private static final HashMap<String, String[]> ERA_SHORT_NAMES = new HashMap<>();

    /**

     * Full names for eras.

     */

    private static final HashMap<String, String[]> ERA_FULL_NAMES = new HashMap<>();

    /**

     * Fallback language for the era names.

     */

    private static final String FALLBACK_LANGUAGE = "en";

    /**

     * Language that has the era names.

     */

    private static final String TARGET_LANGUAGE = "th";

    /**

     * Name data.

     */

    static {

        ERA_NARROW_NAMES.put(FALLBACK_LANGUAGE, new String[]{"BB", "BE"});

        ERA_NARROW_NAMES.put(TARGET_LANGUAGE, new String[]{"BB", "BE"});

        ERA_SHORT_NAMES.put(FALLBACK_LANGUAGE, new String[]{"B.B.", "B.E."});

        ERA_SHORT_NAMES.put(TARGET_LANGUAGE,

                new String[]{"\u0e1e.\u0e28.",

                "\u0e1b\u0e35\u0e01\u0e48\u0e2d\u0e19\u0e04\u0e23\u0e34\u0e2a\u0e15\u0e4c\u0e01\u0e32\u0e25\u0e17\u0e35\u0e48"});

        ERA_FULL_NAMES.put(FALLBACK_LANGUAGE, new String[]{"Before Buddhist", "Budhhist Era"});

        ERA_FULL_NAMES.put(TARGET_LANGUAGE,

                new String[]{"\u0e1e\u0e38\u0e17\u0e18\u0e28\u0e31\u0e01\u0e23\u0e32\u0e0a",

                "\u0e1b\u0e35\u0e01\u0e48\u0e2d\u0e19\u0e04\u0e23\u0e34\u0e2a\u0e15\u0e4c\u0e01\u0e32\u0e25\u0e17\u0e35\u0e48"});

    }

    /**

     * Restricted constructor.

     */

    private ThaiBuddhistChrono() {

    }

    /**

     * Resolve singleton.

     *

     * @return the singleton instance, not null

     */

    private Object readResolve() {

        return INSTANCE;

    }

    //-----------------------------------------------------------------------

    /**

     * Gets the ID of the chronology - 'ThaiBuddhist'.

     * <p>

     * The ID uniquely identifies the {@code Chrono}.

     * It can be used to lookup the {@code Chrono} using {@link #of(String)}.

     *

     * @return the chronology ID - 'ThaiBuddhist'

     * @see #getCalendarType()

     */

    @Override

    public String getId() {

        return "ThaiBuddhist";

    }

    /**

     * Gets the calendar type of the underlying calendar system - 'buddhist'.

     * <p>

     * The calendar type is an identifier defined by the

     * <em>Unicode Locale Data Markup Language (LDML)</em> specification.

     * It can be used to lookup the {@code Chrono} using {@link #of(String)}.

     * It can also be used as part of a locale, accessible via

     * {@link Locale#getUnicodeLocaleType(String)} with the key 'ca'.

     *

     * @return the calendar system type - 'buddhist'

     * @see #getId()

     */

    @Override

    public String getCalendarType() {

        return "buddhist";

    }

    //-----------------------------------------------------------------------

    @Override

    public ChronoLocalDate<ThaiBuddhistChrono> date(int prolepticYear, int month, int dayOfMonth) {

        return new ThaiBuddhistDate(LocalDate.of(prolepticYear - YEARS_DIFFERENCE, month, dayOfMonth));

    }

    @Override

    public ChronoLocalDate<ThaiBuddhistChrono> dateYearDay(int prolepticYear, int dayOfYear) {

        return new ThaiBuddhistDate(LocalDate.ofYearDay(prolepticYear - YEARS_DIFFERENCE, dayOfYear));

    }

    @Override

    public ChronoLocalDate<ThaiBuddhistChrono> date(TemporalAccessor temporal) {

        if (temporal instanceof ThaiBuddhistDate) {

            return (ThaiBuddhistDate) temporal;

        }

        return new ThaiBuddhistDate(LocalDate.from(temporal));

    }

    //-----------------------------------------------------------------------

    /**

     * Checks if the specified year is a leap year.

     * <p>

     * Thai Buddhist leap years occur exactly in line with ISO leap years.

     * This method does not validate the year passed in, and only has a

     * well-defined result for years in the supported range.

     *

     * @param prolepticYear  the proleptic-year to check, not validated for range

     * @return true if the year is a leap year

     */

    @Override

    public boolean isLeapYear(long prolepticYear) {

        return ISOChrono.INSTANCE.isLeapYear(prolepticYear - YEARS_DIFFERENCE);

    }

    @Override

    public int prolepticYear(Era<ThaiBuddhistChrono> era, int yearOfEra) {

        if (era instanceof ThaiBuddhistEra == false) {

            throw new DateTimeException("Era must be BuddhistEra");

        }

        return (era == ThaiBuddhistEra.BE ? yearOfEra : 1 - yearOfEra);

    }

    @Override

    public Era<ThaiBuddhistChrono> eraOf(int eraValue) {

        return ThaiBuddhistEra.of(eraValue);

    }

    @Override

    public List<Era<ThaiBuddhistChrono>> eras() {

        return Arrays.<Era<ThaiBuddhistChrono>>asList(ThaiBuddhistEra.values());

    }

    //-----------------------------------------------------------------------

    @Override

    public ValueRange range(ChronoField field) {

        switch (field) {

            case YEAR_OF_ERA: {

                ValueRange range = YEAR.range();

                return ValueRange.of(1, -(range.getMinimum() + YEARS_DIFFERENCE) + 1, range.getMaximum() + YEARS_DIFFERENCE);

            }

            case YEAR: {

                ValueRange range = YEAR.range();

                return ValueRange.of(range.getMinimum() + YEARS_DIFFERENCE, range.getMaximum() + YEARS_DIFFERENCE);

            }

        }

        return field.range();

    }

}