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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:

 *

 *  * 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.chrono;

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

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

import static java.time.temporal.ChronoUnit.NANOS;

import java.time.DateTimeException;

import java.time.Instant;

import java.time.LocalTime;

import java.time.ZoneId;

import java.time.ZoneOffset;

import java.time.ZonedDateTime;

import java.time.format.DateTimeFormatter;

import java.time.temporal.ChronoField;

import java.time.temporal.Queries;

import java.time.temporal.Temporal;

import java.time.temporal.TemporalAccessor;

import java.time.temporal.TemporalAdjuster;

import java.time.temporal.TemporalAmount;

import java.time.temporal.TemporalField;

import java.time.temporal.TemporalQuery;

import java.time.temporal.TemporalUnit;

import java.time.temporal.ValueRange;

import java.util.Comparator;

import java.util.Objects;

/**

 * A date-time with a time-zone in an arbitrary chronology,

 * intended for advanced globalization use cases.

 * <p>

 * <b>Most applications should declare method signatures, fields and variables

 * as {@link ZonedDateTime}, not this interface.</b>

 * <p>

 * A {@code ChronoZonedDateTime} is the abstract representation of an offset date-time

 * where the {@code Chronology chronology}, or calendar system, is pluggable.

 * The date-time is defined in terms of fields expressed by {@link TemporalField},

 * where most common implementations are defined in {@link ChronoField}.

 * The chronology defines how the calendar system operates and the meaning of

 * the standard fields.

 *

 * <h3>When to use this interface</h3>

 * The design of the API encourages the use of {@code ZonedDateTime} rather than this

 * interface, even in the case where the application needs to deal with multiple

 * calendar systems. The rationale for this is explored in detail in {@link ChronoLocalDate}.

 * <p>

 * Ensure that the discussion in {@code ChronoLocalDate} has been read and understood

 * before using this interface.

 *

 * <h3>Specification for implementors</h3>

 * This interface must be implemented with care to ensure other classes operate correctly.

 * All implementations that can be instantiated must be final, immutable and thread-safe.

 * Subclasses should be Serializable wherever possible.

 *

 * @param <D> the concrete type for the date of this date-time

 * @since 1.8

 */

public interface ChronoZonedDateTime<D extends ChronoLocalDate<D>>

        extends Temporal, Comparable<ChronoZonedDateTime<?>> {

    /**

     * Comparator for two {@code ChronoZonedDateTime} instances ignoring the chronology.

     * <p>

     * This method differs from the comparison in {@link #compareTo} in that it

     * only compares the underlying date and not the chronology.

     * This allows dates in different calendar systems to be compared based

     * on the time-line position.

     *

     * @see #isAfter

     * @see #isBefore

     * @see #isEqual

     */

    Comparator<ChronoZonedDateTime<?>> INSTANT_COMPARATOR = new Comparator<ChronoZonedDateTime<?>>() {

        @Override

        public int compare(ChronoZonedDateTime<?> datetime1, ChronoZonedDateTime<?> datetime2) {

            int cmp = Long.compare(datetime1.toEpochSecond(), datetime2.toEpochSecond());

            if (cmp == 0) {

                cmp = Long.compare(datetime1.toLocalTime().toNanoOfDay(), datetime2.toLocalTime().toNanoOfDay());

            }

            return cmp;

        }

    };

    @Override

    public default ValueRange range(TemporalField field) {

        if (field instanceof ChronoField) {

            if (field == INSTANT_SECONDS || field == OFFSET_SECONDS) {

                return field.range();

            }

            return toLocalDateTime().range(field);

        }

        return field.rangeRefinedBy(this);

    }

    @Override

    public default int get(TemporalField field) {

        if (field instanceof ChronoField) {

            switch ((ChronoField) field) {

                case INSTANT_SECONDS: throw new DateTimeException("Field too large for an int: " + field);

                case OFFSET_SECONDS: return getOffset().getTotalSeconds();

            }

            return toLocalDateTime().get(field);

        }

        return Temporal.super.get(field);

    }

    @Override

    public default long getLong(TemporalField field) {

        if (field instanceof ChronoField) {

            switch ((ChronoField) field) {

                case INSTANT_SECONDS: return toEpochSecond();

                case OFFSET_SECONDS: return getOffset().getTotalSeconds();

            }

            return toLocalDateTime().getLong(field);

        }

        return field.getFrom(this);

    }

    /**

     * Gets the local date part of this date-time.

     * <p>

     * This returns a local date with the same year, month and day

     * as this date-time.

     *

     * @return the date part of this date-time, not null

     */

    public default D toLocalDate() {

        return toLocalDateTime().toLocalDate();

    }

    /**

     * Gets the local time part of this date-time.

     * <p>

     * This returns a local time with the same hour, minute, second and

     * nanosecond as this date-time.

     *

     * @return the time part of this date-time, not null

     */

    public default LocalTime toLocalTime() {

        return toLocalDateTime().toLocalTime();

    }

    /**

     * Gets the local date-time part of this date-time.

     * <p>

     * This returns a local date with the same year, month and day

     * as this date-time.

     *

     * @return the local date-time part of this date-time, not null

     */

    ChronoLocalDateTime<D> toLocalDateTime();

    /**

     * Gets the zone offset, such as '+01:00'.

     * <p>

     * This is the offset of the local date-time from UTC/Greenwich.

     *

     * @return the zone offset, not null

     */

    ZoneOffset getOffset();

    /**

     * Gets the zone ID, such as 'Europe/Paris'.

     * <p>

     * This returns the stored time-zone id used to determine the time-zone rules.

     *

     * @return the zone ID, not null

     */

    ZoneId getZone();

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

    /**

     * Returns a copy of this date-time changing the zone offset to the

     * earlier of the two valid offsets at a local time-line overlap.

     * <p>

     * This method only has any effect when the local time-line overlaps, such as

     * at an autumn daylight savings cutover. In this scenario, there are two

     * valid offsets for the local date-time. Calling this method will return

     * a zoned date-time with the earlier of the two selected.

     * <p>

     * If this method is called when it is not an overlap, {@code this}

     * is returned.

     * <p>

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

     *

     * @return a {@code ZoneChronoDateTime} based on this date-time with the earlier offset, not null

     * @throws DateTimeException if no rules can be found for the zone

     * @throws DateTimeException if no rules are valid for this date-time

     */

    ChronoZonedDateTime<D> withEarlierOffsetAtOverlap();

    /**

     * Returns a copy of this date-time changing the zone offset to the

     * later of the two valid offsets at a local time-line overlap.

     * <p>

     * This method only has any effect when the local time-line overlaps, such as

     * at an autumn daylight savings cutover. In this scenario, there are two

     * valid offsets for the local date-time. Calling this method will return

     * a zoned date-time with the later of the two selected.

     * <p>

     * If this method is called when it is not an overlap, {@code this}

     * is returned.

     * <p>

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

     *

     * @return a {@code ChronoZonedDateTime} based on this date-time with the later offset, not null

     * @throws DateTimeException if no rules can be found for the zone

     * @throws DateTimeException if no rules are valid for this date-time

     */

    ChronoZonedDateTime<D> withLaterOffsetAtOverlap();

    /**

     * Returns a copy of this ZonedDateTime with a different time-zone,

     * retaining the local date-time if possible.

     * <p>

     * This method changes the time-zone and retains the local date-time.

     * The local date-time is only changed if it is invalid for the new zone.

     * <p>

     * To change the zone and adjust the local date-time,

     * use {@link #withZoneSameInstant(ZoneId)}.

     * <p>

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

     *

     * @param zone  the time-zone to change to, not null

     * @return a {@code ChronoZonedDateTime} based on this date-time with the requested zone, not null

     */

    ChronoZonedDateTime<D> withZoneSameLocal(ZoneId zone);

    /**

     * Returns a copy of this date-time with a different time-zone,

     * retaining the instant.

     * <p>

     * This method changes the time-zone and retains the instant.

     * This normally results in a change to the local date-time.

     * <p>

     * This method is based on retaining the same instant, thus gaps and overlaps

     * in the local time-line have no effect on the result.

     * <p>

     * To change the offset while keeping the local time,

     * use {@link #withZoneSameLocal(ZoneId)}.

     *

     * @param zone  the time-zone to change to, not null

     * @return a {@code ChronoZonedDateTime} based on this date-time with the requested zone, not null

     * @throws DateTimeException if the result exceeds the supported date range

     */

    ChronoZonedDateTime<D> withZoneSameInstant(ZoneId zone);

    @Override   // Override to provide javadoc

    public boolean isSupported(TemporalField field);

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

    // override for covariant return type

    /**

     * {@inheritDoc}

     * @throws DateTimeException {@inheritDoc}

     * @throws ArithmeticException {@inheritDoc}

     */

    @Override

    public default ChronoZonedDateTime<D> with(TemporalAdjuster adjuster) {

        return (ChronoZonedDateTime<D>)(toLocalDate().getChronology().ensureChronoZonedDateTime(Temporal.super.with(adjuster)));

    }

    /**

     * {@inheritDoc}

     * @throws DateTimeException {@inheritDoc}

     * @throws ArithmeticException {@inheritDoc}

     */

    @Override

    ChronoZonedDateTime<D> with(TemporalField field, long newValue);

    /**

     * {@inheritDoc}

     * @throws DateTimeException {@inheritDoc}

     * @throws ArithmeticException {@inheritDoc}

     */

    @Override

    public default ChronoZonedDateTime<D> plus(TemporalAmount amount) {

        return (ChronoZonedDateTime<D>)(toLocalDate().getChronology().ensureChronoZonedDateTime(Temporal.super.plus(amount)));

    }

    /**

     * {@inheritDoc}

     * @throws DateTimeException {@inheritDoc}

     * @throws ArithmeticException {@inheritDoc}

     */

    @Override

    ChronoZonedDateTime<D> plus(long amountToAdd, TemporalUnit unit);

    /**

     * {@inheritDoc}

     * @throws DateTimeException {@inheritDoc}

     * @throws ArithmeticException {@inheritDoc}

     */

    @Override

    public default ChronoZonedDateTime<D> minus(TemporalAmount amount) {

        return (ChronoZonedDateTime<D>)(toLocalDate().getChronology().ensureChronoZonedDateTime(Temporal.super.minus(amount)));

    }

    /**

     * {@inheritDoc}

     * @throws DateTimeException {@inheritDoc}

     * @throws ArithmeticException {@inheritDoc}

     */

    @Override

    public default ChronoZonedDateTime<D> minus(long amountToSubtract, TemporalUnit unit) {

        return (ChronoZonedDateTime<D>)(toLocalDate().getChronology().ensureChronoZonedDateTime(Temporal.super.minus(amountToSubtract, unit)));

    }

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

    /**

     * Queries this date-time using the specified query.

     * <p>

     * This queries this date-time using the specified query strategy object.

     * The {@code TemporalQuery} object defines the logic to be used to

     * obtain the result. Read the documentation of the query to understand

     * what the result of this method will be.

     * <p>

     * The result of this method is obtained by invoking the

     * {@link java.time.temporal.TemporalQuery#queryFrom(TemporalAccessor)} method on the

     * specified query passing {@code this} as the argument.

     *

     * @param <R> the type of the result

     * @param query  the query to invoke, not null

     * @return the query result, null may be returned (defined by the query)

     * @throws DateTimeException if unable to query (defined by the query)

     * @throws ArithmeticException if numeric overflow occurs (defined by the query)

     */

    @SuppressWarnings("unchecked")

    @Override

    public default <R> R query(TemporalQuery<R> query) {

        if (query == Queries.zone() || query == Queries.zoneId()) {

            return (R) getZone();

        } else if (query == Queries.offset()) {

            return (R) getOffset();

        } else if (query == Queries.localTime()) {

            return (R) toLocalTime();

        } else if (query == Queries.chronology()) {

            return (R) toLocalDate().getChronology();

        } else if (query == Queries.precision()) {

            return (R) NANOS;

        }

        // inline TemporalAccessor.super.query(query) as an optimization

        // non-JDK classes are not permitted to make this optimization

        return query.queryFrom(this);

    }

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

    /**

     * Converts this date-time to an {@code Instant}.

     * <p>

     * This returns an {@code Instant} representing the same point on the

     * time-line as this date-time. The calculation combines the

     * {@linkplain #toLocalDateTime() local date-time} and

     * {@linkplain #getOffset() offset}.

     *

     * @return an {@code Instant} representing the same instant, not null

     */

    public default Instant toInstant() {

        return Instant.ofEpochSecond(toEpochSecond(), toLocalTime().getNano());

    }

    /**

     * Converts this date-time to the number of seconds from the epoch

     * of 1970-01-01T00:00:00Z.

     * <p>

     * This uses the {@linkplain #toLocalDateTime() local date-time} and

     * {@linkplain #getOffset() offset} to calculate the epoch-second value,

     * which is the number of elapsed seconds from 1970-01-01T00:00:00Z.

     * Instants on the time-line after the epoch are positive, earlier are negative.

     *

     * @return the number of seconds from the epoch of 1970-01-01T00:00:00Z

     */

    public default long toEpochSecond() {

        long epochDay = toLocalDate().toEpochDay();

        long secs = epochDay * 86400 + toLocalTime().toSecondOfDay();

        secs -= getOffset().getTotalSeconds();

        return secs;

    }

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

    /**

     * Compares this date-time to another date-time, including the chronology.

     * <p>

     * The comparison is based first on the instant, then on the local date-time,

     * then on the zone ID, then on the chronology.

     * It is "consistent with equals", as defined by {@link Comparable}.

     * <p>

     * If all the date-time objects being compared are in the same chronology, then the

     * additional chronology stage is not required.

     * <p>

     * This default implementation performs the comparison defined above.

     *

     * @param other  the other date-time to compare to, not null

     * @return the comparator value, negative if less, positive if greater

     */

    @Override

    public default int compareTo(ChronoZonedDateTime<?> other) {

        int cmp = Long.compare(toEpochSecond(), other.toEpochSecond());

        if (cmp == 0) {

            cmp = toLocalTime().getNano() - other.toLocalTime().getNano();

            if (cmp == 0) {

                cmp = toLocalDateTime().compareTo(other.toLocalDateTime());

                if (cmp == 0) {

                    cmp = getZone().getId().compareTo(other.getZone().getId());

                    if (cmp == 0) {

                        cmp = toLocalDate().getChronology().compareTo(other.toLocalDate().getChronology());

                    }

                }

            }

        }

        return cmp;

    }

    /**

     * Checks if the instant of this date-time is before that of the specified date-time.

     * <p>

     * This method differs from the comparison in {@link #compareTo} in that it

     * only compares the instant of the date-time. This is equivalent to using

     * {@code dateTime1.toInstant().isBefore(dateTime2.toInstant());}.

     * <p>

     * This default implementation performs the comparison based on the epoch-second

     * and nano-of-second.

     *

     * @param other  the other date-time to compare to, not null

     * @return true if this point is before the specified date-time

     */

    public default boolean isBefore(ChronoZonedDateTime<?> other) {

        long thisEpochSec = toEpochSecond();

        long otherEpochSec = other.toEpochSecond();

        return thisEpochSec < otherEpochSec ||

            (thisEpochSec == otherEpochSec && toLocalTime().getNano() < other.toLocalTime().getNano());

    }

    /**

     * Checks if the instant of this date-time is after that of the specified date-time.

     * <p>

     * This method differs from the comparison in {@link #compareTo} in that it

     * only compares the instant of the date-time. This is equivalent to using

     * {@code dateTime1.toInstant().isAfter(dateTime2.toInstant());}.

     * <p>

     * This default implementation performs the comparison based on the epoch-second

     * and nano-of-second.

     *

     * @param other  the other date-time to compare to, not null

     * @return true if this is after the specified date-time

     */

    public default boolean isAfter(ChronoZonedDateTime<?> other) {

        long thisEpochSec = toEpochSecond();

        long otherEpochSec = other.toEpochSecond();

        return thisEpochSec > otherEpochSec ||

            (thisEpochSec == otherEpochSec && toLocalTime().getNano() > other.toLocalTime().getNano());

    }

    /**

     * Checks if the instant of this date-time is equal to that of the specified date-time.

     * <p>

     * This method differs from the comparison in {@link #compareTo} and {@link #equals}

     * in that it only compares the instant of the date-time. This is equivalent to using

     * {@code dateTime1.toInstant().equals(dateTime2.toInstant());}.

     * <p>

     * This default implementation performs the comparison based on the epoch-second

     * and nano-of-second.

     *

     * @param other  the other date-time to compare to, not null

     * @return true if the instant equals the instant of the specified date-time

     */

    public default boolean isEqual(ChronoZonedDateTime<?> other) {

        return toEpochSecond() == other.toEpochSecond() &&

                toLocalTime().getNano() == other.toLocalTime().getNano();