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/*

 * This file is available under and governed by the GNU General Public

 * License version 2 only, as published by the Free Software Foundation.

 * However, the following notice accompanied the original version of this

 * file:

 *

 * Copyright (c) 2007-2012, 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:

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

 *    this list of conditions and the following disclaimer.

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package java.time;

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

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

import java.io.DataInput;

import java.io.DataOutput;

import java.io.IOException;

import java.io.InvalidObjectException;

import java.io.ObjectInputStream;

import java.io.Serializable;

import java.time.chrono.Chronology;

import java.time.chrono.IsoChronology;

import java.time.format.DateTimeFormatter;

import java.time.format.DateTimeFormatterBuilder;

import java.time.format.DateTimeParseException;

import java.time.temporal.ChronoField;

import java.time.temporal.Temporal;

import java.time.temporal.TemporalAccessor;

import java.time.temporal.TemporalAdjuster;

import java.time.temporal.TemporalField;

import java.time.temporal.TemporalQueries;

import java.time.temporal.TemporalQuery;

import java.time.temporal.UnsupportedTemporalTypeException;

import java.time.temporal.ValueRange;

import java.util.Objects;

/**

 * A month-day in the ISO-8601 calendar system, such as {@code --12-03}.

 * <p>

 * {@code MonthDay} is an immutable date-time object that represents the combination

 * of a month and day-of-month. Any field that can be derived from a month and day,

 * such as quarter-of-year, can be obtained.

 * <p>

 * This class does not store or represent a year, time or time-zone.

 * For example, the value "December 3rd" can be stored in a {@code MonthDay}.

 * <p>

 * Since a {@code MonthDay} does not possess a year, the leap day of

 * February 29th is considered valid.

 * <p>

 * This class implements {@link TemporalAccessor} rather than {@link Temporal}.

 * This is because it is not possible to define whether February 29th is valid or not

 * without external information, preventing the implementation of plus/minus.

 * Related to this, {@code MonthDay} only provides access to query and set the fields

 * {@code MONTH_OF_YEAR} and {@code DAY_OF_MONTH}.

 * <p>

 * The ISO-8601 calendar system is the modern civil calendar system used today

 * in most of the world. It is equivalent to the proleptic Gregorian calendar

 * system, in which today's rules for leap years are applied for all time.

 * For most applications written today, the ISO-8601 rules are entirely suitable.

 * However, any application that makes use of historical dates, and requires them

 * to be accurate will find the ISO-8601 approach unsuitable.

 *

 * <p>

 * This is a <a href="{@docRoot}/java/lang/doc-files/ValueBased.html">value-based</a>

 * class; use of identity-sensitive operations (including reference equality

 * ({@code ==}), identity hash code, or synchronization) on instances of

 * {@code MonthDay} may have unpredictable results and should be avoided.

 * The {@code equals} method should be used for comparisons.

 *

 * @implSpec

 * This class is immutable and thread-safe.

 *

 * @since 1.8

 */

public final class MonthDay

        implements TemporalAccessor, TemporalAdjuster, Comparable<MonthDay>, Serializable {

    /**

     * Serialization version.

     */

    private static final long serialVersionUID = -939150713474957432L;

    /**

     * Parser.

     */

    private static final DateTimeFormatter PARSER = new DateTimeFormatterBuilder()

        .appendLiteral("--")

        .appendValue(MONTH_OF_YEAR, 2)

        .appendLiteral('-')

        .appendValue(DAY_OF_MONTH, 2)

        .toFormatter();

    /**

     * The month-of-year, not null.

     */

    private final int month;

    /**

     * The day-of-month.

     */

    private final int day;

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

    /**

     * Obtains the current month-day from the system clock in the default time-zone.

     * <p>

     * This will query the {@link Clock#systemDefaultZone() system clock} in the default

     * time-zone to obtain the current month-day.

     * <p>

     * Using this method will prevent the ability to use an alternate clock for testing

     * because the clock is hard-coded.

     *

     * @return the current month-day using the system clock and default time-zone, not null

     */

    public static MonthDay now() {

        return now(Clock.systemDefaultZone());

    }

    /**

     * Obtains the current month-day from the system clock in the specified time-zone.

     * <p>

     * This will query the {@link Clock#system(ZoneId) system clock} to obtain the current month-day.

     * Specifying the time-zone avoids dependence on the default time-zone.

     * <p>

     * Using this method will prevent the ability to use an alternate clock for testing

     * because the clock is hard-coded.

     *

     * @param zone  the zone ID to use, not null

     * @return the current month-day using the system clock, not null

     */

    public static MonthDay now(ZoneId zone) {

        return now(Clock.system(zone));

    }

    /**

     * Obtains the current month-day from the specified clock.

     * <p>

     * This will query the specified clock to obtain the current month-day.

     * Using this method allows the use of an alternate clock for testing.

     * The alternate clock may be introduced using {@link Clock dependency injection}.

     *

     * @param clock  the clock to use, not null

     * @return the current month-day, not null

     */

    public static MonthDay now(Clock clock) {

        final LocalDate now = LocalDate.now(clock);  // called once

        return MonthDay.of(now.getMonth(), now.getDayOfMonth());

    }

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

    /**

     * Obtains an instance of {@code MonthDay}.

     * <p>

     * The day-of-month must be valid for the month within a leap year.

     * Hence, for February, day 29 is valid.

     * <p>

     * For example, passing in April and day 31 will throw an exception, as

     * there can never be April 31st in any year. By contrast, passing in

     * February 29th is permitted, as that month-day can sometimes be valid.

     *

     * @param month  the month-of-year to represent, not null

     * @param dayOfMonth  the day-of-month to represent, from 1 to 31

     * @return the month-day, not null

     * @throws DateTimeException if the value of any field is out of range,

     *  or if the day-of-month is invalid for the month

     */

    public static MonthDay of(Month month, int dayOfMonth) {

        Objects.requireNonNull(month, "month");

        DAY_OF_MONTH.checkValidValue(dayOfMonth);

        if (dayOfMonth > month.maxLength()) {

            throw new DateTimeException("Illegal value for DayOfMonth field, value " + dayOfMonth +

                    " is not valid for month " + month.name());

        }

        return new MonthDay(month.getValue(), dayOfMonth);

    }

    /**

     * Obtains an instance of {@code MonthDay}.

     * <p>

     * The day-of-month must be valid for the month within a leap year.

     * Hence, for month 2 (February), day 29 is valid.

     * <p>

     * For example, passing in month 4 (April) and day 31 will throw an exception, as

     * there can never be April 31st in any year. By contrast, passing in

     * February 29th is permitted, as that month-day can sometimes be valid.

     *

     * @param month  the month-of-year to represent, from 1 (January) to 12 (December)

     * @param dayOfMonth  the day-of-month to represent, from 1 to 31

     * @return the month-day, not null

     * @throws DateTimeException if the value of any field is out of range,

     *  or if the day-of-month is invalid for the month

     */

    public static MonthDay of(int month, int dayOfMonth) {

        return of(Month.of(month), dayOfMonth);

    }

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

    /**

     * Obtains an instance of {@code MonthDay} from a temporal object.

     * <p>

     * This obtains a month-day based on the specified temporal.

     * A {@code TemporalAccessor} represents an arbitrary set of date and time information,

     * which this factory converts to an instance of {@code MonthDay}.

     * <p>

     * The conversion extracts the {@link ChronoField#MONTH_OF_YEAR MONTH_OF_YEAR} and

     * {@link ChronoField#DAY_OF_MONTH DAY_OF_MONTH} fields.

     * The extraction is only permitted if the temporal object has an ISO

     * chronology, or can be converted to a {@code LocalDate}.

     * <p>

     * This method matches the signature of the functional interface {@link TemporalQuery}

     * allowing it to be used as a query via method reference, {@code MonthDay::from}.

     *

     * @param temporal  the temporal object to convert, not null

     * @return the month-day, not null

     * @throws DateTimeException if unable to convert to a {@code MonthDay}

     */

    public static MonthDay from(TemporalAccessor temporal) {

        if (temporal instanceof MonthDay) {

            return (MonthDay) temporal;

        }

        try {

            if (IsoChronology.INSTANCE.equals(Chronology.from(temporal)) == false) {

                temporal = LocalDate.from(temporal);

            }

            return of(temporal.get(MONTH_OF_YEAR), temporal.get(DAY_OF_MONTH));

        } catch (DateTimeException ex) {

            throw new DateTimeException("Unable to obtain MonthDay from TemporalAccessor: " +

                    temporal + " of type " + temporal.getClass().getName(), ex);

        }

    }

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

    /**

     * Obtains an instance of {@code MonthDay} from a text string such as {@code --12-03}.

     * <p>

     * The string must represent a valid month-day.

     * The format is {@code --MM-dd}.

     *

     * @param text  the text to parse such as "--12-03", not null

     * @return the parsed month-day, not null

     * @throws DateTimeParseException if the text cannot be parsed

     */

    public static MonthDay parse(CharSequence text) {

        return parse(text, PARSER);

    }

    /**

     * Obtains an instance of {@code MonthDay} from a text string using a specific formatter.

     * <p>

     * The text is parsed using the formatter, returning a month-day.

     *

     * @param text  the text to parse, not null

     * @param formatter  the formatter to use, not null

     * @return the parsed month-day, not null

     * @throws DateTimeParseException if the text cannot be parsed

     */

    public static MonthDay parse(CharSequence text, DateTimeFormatter formatter) {

        Objects.requireNonNull(formatter, "formatter");

        return formatter.parse(text, MonthDay::from);

    }

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

    /**

     * Constructor, previously validated.

     *

     * @param month  the month-of-year to represent, validated from 1 to 12

     * @param dayOfMonth  the day-of-month to represent, validated from 1 to 29-31

     */

    private MonthDay(int month, int dayOfMonth) {

        this.month = month;

        this.day = dayOfMonth;

    }

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

    /**

     * Checks if the specified field is supported.

     * <p>

     * This checks if this month-day can be queried for the specified field.

     * If false, then calling the {@link #range(TemporalField) range} and

     * {@link #get(TemporalField) get} methods will throw an exception.

     * <p>

     * If the field is a {@link ChronoField} then the query is implemented here.

     * The supported fields are:

     * <ul>

     * <li>{@code MONTH_OF_YEAR}

     * <li>{@code YEAR}

     * </ul>

     * All other {@code ChronoField} instances will return false.

     * <p>

     * If the field is not a {@code ChronoField}, then the result of this method

     * is obtained by invoking {@code TemporalField.isSupportedBy(TemporalAccessor)}

     * passing {@code this} as the argument.

     * Whether the field is supported is determined by the field.

     *

     * @param field  the field to check, null returns false

     * @return true if the field is supported on this month-day, false if not

     */

    @Override

    public boolean isSupported(TemporalField field) {

        if (field instanceof ChronoField) {

            return field == MONTH_OF_YEAR || field == DAY_OF_MONTH;

        }

        return field != null && field.isSupportedBy(this);

    }

    /**

     * Gets the range of valid values for the specified field.

     * <p>

     * The range object expresses the minimum and maximum valid values for a field.

     * This month-day is used to enhance the accuracy of the returned range.

     * If it is not possible to return the range, because the field is not supported

     * or for some other reason, an exception is thrown.

     * <p>

     * If the field is a {@link ChronoField} then the query is implemented here.

     * The {@link #isSupported(TemporalField) supported fields} will return

     * appropriate range instances.

     * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.

     * <p>

     * If the field is not a {@code ChronoField}, then the result of this method

     * is obtained by invoking {@code TemporalField.rangeRefinedBy(TemporalAccessor)}

     * passing {@code this} as the argument.

     * Whether the range can be obtained is determined by the field.

     *

     * @param field  the field to query the range for, not null

     * @return the range of valid values for the field, not null

     * @throws DateTimeException if the range for the field cannot be obtained

     * @throws UnsupportedTemporalTypeException if the field is not supported

     */

    @Override

    public ValueRange range(TemporalField field) {

        if (field == MONTH_OF_YEAR) {

            return field.range();

        } else if (field == DAY_OF_MONTH) {

            return ValueRange.of(1, getMonth().minLength(), getMonth().maxLength());

        }

        return TemporalAccessor.super.range(field);

    }

    /**

     * Gets the value of the specified field from this month-day as an {@code int}.

     * <p>

     * This queries this month-day for the value of the specified field.

     * The returned value will always be within the valid range of values for the field.

     * If it is not possible to return the value, because the field is not supported

     * or for some other reason, an exception is thrown.

     * <p>

     * If the field is a {@link ChronoField} then the query is implemented here.

     * The {@link #isSupported(TemporalField) supported fields} will return valid

     * values based on this month-day.

     * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.

     * <p>

     * If the field is not a {@code ChronoField}, then the result of this method

     * is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}

     * passing {@code this} as the argument. Whether the value can be obtained,

     * and what the value represents, is determined by the field.

     *

     * @param field  the field to get, not null

     * @return the value for the field

     * @throws DateTimeException if a value for the field cannot be obtained or

     *         the value is outside the range of valid values for the field

     * @throws UnsupportedTemporalTypeException if the field is not supported or

     *         the range of values exceeds an {@code int}

     * @throws ArithmeticException if numeric overflow occurs

     */

    @Override  // override for Javadoc

    public int get(TemporalField field) {

        return range(field).checkValidIntValue(getLong(field), field);

    }

    /**

     * Gets the value of the specified field from this month-day as a {@code long}.

     * <p>

     * This queries this month-day for the value of the specified field.

     * If it is not possible to return the value, because the field is not supported

     * or for some other reason, an exception is thrown.

     * <p>

     * If the field is a {@link ChronoField} then the query is implemented here.

     * The {@link #isSupported(TemporalField) supported fields} will return valid

     * values based on this month-day.

     * All other {@code ChronoField} instances will throw an {@code UnsupportedTemporalTypeException}.

     * <p>

     * If the field is not a {@code ChronoField}, then the result of this method

     * is obtained by invoking {@code TemporalField.getFrom(TemporalAccessor)}

     * passing {@code this} as the argument. Whether the value can be obtained,

     * and what the value represents, is determined by the field.

     *

     * @param field  the field to get, not null

     * @return the value for the field

     * @throws DateTimeException if a value for the field cannot be obtained

     * @throws UnsupportedTemporalTypeException if the field is not supported

     * @throws ArithmeticException if numeric overflow occurs

     */

    @Override

    public long getLong(TemporalField field) {

        if (field instanceof ChronoField) {

            switch ((ChronoField) field) {

                // alignedDOW and alignedWOM not supported because they cannot be set in with()

                case DAY_OF_MONTH: return day;

                case MONTH_OF_YEAR: return month;

            }

            throw new UnsupportedTemporalTypeException("Unsupported field: " + field);

        }

        return field.getFrom(this);

    }

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

    /**

     * Gets the month-of-year field from 1 to 12.

     * <p>

     * This method returns the month as an {@code int} from 1 to 12.

     * Application code is frequently clearer if the enum {@link Month}

     * is used by calling {@link #getMonth()}.

     *

     * @return the month-of-year, from 1 to 12

     * @see #getMonth()

     */

    public int getMonthValue() {

        return month;

    }

    /**

     * Gets the month-of-year field using the {@code Month} enum.

     * <p>

     * This method returns the enum {@link Month} for the month.

     * This avoids confusion as to what {@code int} values mean.

     * If you need access to the primitive {@code int} value then the enum

     * provides the {@link Month#getValue() int value}.

     *

     * @return the month-of-year, not null

     * @see #getMonthValue()

     */

    public Month getMonth() {

        return Month.of(month);

    }

    /**

     * Gets the day-of-month field.

     * <p>

     * This method returns the primitive {@code int} value for the day-of-month.

     *

     * @return the day-of-month, from 1 to 31

     */

    public int getDayOfMonth() {

        return day;

    }

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

    /**

     * Checks if the year is valid for this month-day.

     * <p>

     * This method checks whether this month and day and the input year form

     * a valid date. This can only return false for February 29th.

     *

     * @param year  the year to validate

     * @return true if the year is valid for this month-day

     * @see Year#isValidMonthDay(MonthDay)

     */

    public boolean isValidYear(int year) {

        return (day == 29 && month == 2 && Year.isLeap(year) == false) == false;

    }

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

    /**

     * Returns a copy of this {@code MonthDay} with the month-of-year altered.

     * <p>

     * This returns a month-day with the specified month.

     * If the day-of-month is invalid for the specified month, the day will

     * be adjusted to the last valid day-of-month.

     * <p>

     * This instance is immutable and unaffected by this method call.

     *

     * @param month  the month-of-year to set in the returned month-day, from 1 (January) to 12 (December)

     * @return a {@code MonthDay} based on this month-day with the requested month, not null

     * @throws DateTimeException if the month-of-year value is invalid