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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.

 *

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

 *    this list of conditions and the following disclaimer in the documentation

 *    and/or other materials provided with the distribution.

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 *  * 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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package java.time.chrono;

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

import java.io.IOException;

import java.io.InvalidObjectException;

import java.io.ObjectInput;

import java.io.ObjectInputStream;

import java.io.ObjectOutput;

import java.io.Serializable;

import java.time.LocalTime;

import java.time.ZoneId;

import java.time.temporal.ChronoField;

import java.time.temporal.ChronoUnit;

import java.time.temporal.Temporal;

import java.time.temporal.TemporalAdjuster;

import java.time.temporal.TemporalField;

import java.time.temporal.TemporalUnit;

import java.time.temporal.ValueRange;

import java.util.Objects;

/**

 * A date-time without a time-zone for the calendar neutral API.

 * <p>

 * {@code ChronoLocalDateTime} is an immutable date-time object that represents a date-time, often

 * viewed as year-month-day-hour-minute-second. This object can also access other

 * fields such as day-of-year, day-of-week and week-of-year.

 * <p>

 * This class stores all date and time fields, to a precision of nanoseconds.

 * It does not store or represent a time-zone. For example, the value

 * "2nd October 2007 at 13:45.30.123456789" can be stored in an {@code ChronoLocalDateTime}.

 *

 * @implSpec

 * This class is immutable and thread-safe.

 * @serial

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

 * @since 1.8

 */

final class ChronoLocalDateTimeImpl<D extends ChronoLocalDate>

        implements  ChronoLocalDateTime<D>, Temporal, TemporalAdjuster, Serializable {

    /**

     * Serialization version.

     */

    private static final long serialVersionUID = 4556003607393004514L;

    /**

     * Hours per day.

     */

    static final int HOURS_PER_DAY = 24;

    /**

     * Minutes per hour.

     */

    static final int MINUTES_PER_HOUR = 60;

    /**

     * Minutes per day.

     */

    static final int MINUTES_PER_DAY = MINUTES_PER_HOUR * HOURS_PER_DAY;

    /**

     * Seconds per minute.

     */

    static final int SECONDS_PER_MINUTE = 60;

    /**

     * Seconds per hour.

     */

    static final int SECONDS_PER_HOUR = SECONDS_PER_MINUTE * MINUTES_PER_HOUR;

    /**

     * Seconds per day.

     */

    static final int SECONDS_PER_DAY = SECONDS_PER_HOUR * HOURS_PER_DAY;

    /**

     * Milliseconds per day.

     */

    static final long MILLIS_PER_DAY = SECONDS_PER_DAY * 1000L;

    /**

     * Microseconds per day.

     */

    static final long MICROS_PER_DAY = SECONDS_PER_DAY * 1000_000L;

    /**

     * Nanos per second.

     */

    static final long NANOS_PER_SECOND = 1000_000_000L;

    /**

     * Nanos per minute.

     */

    static final long NANOS_PER_MINUTE = NANOS_PER_SECOND * SECONDS_PER_MINUTE;

    /**

     * Nanos per hour.

     */

    static final long NANOS_PER_HOUR = NANOS_PER_MINUTE * MINUTES_PER_HOUR;

    /**

     * Nanos per day.

     */

    static final long NANOS_PER_DAY = NANOS_PER_HOUR * HOURS_PER_DAY;

    /**

     * The date part.

     */

    private final transient D date;

    /**

     * The time part.

     */

    private final transient LocalTime time;

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

    /**

     * Obtains an instance of {@code ChronoLocalDateTime} from a date and time.

     *

     * @param date  the local date, not null

     * @param time  the local time, not null

     * @return the local date-time, not null

     */

    static <R extends ChronoLocalDate> ChronoLocalDateTimeImpl<R> of(R date, LocalTime time) {

        return new ChronoLocalDateTimeImpl<>(date, time);

    }

    /**

     * Casts the {@code Temporal} to {@code ChronoLocalDateTime} ensuring it bas the specified chronology.

     *

     * @param chrono  the chronology to check for, not null

     * @param temporal   a date-time to cast, not null

     * @return the date-time checked and cast to {@code ChronoLocalDateTime}, not null

     * @throws ClassCastException if the date-time cannot be cast to ChronoLocalDateTimeImpl

     *  or the chronology is not equal this Chronology

     */

    static <R extends ChronoLocalDate> ChronoLocalDateTimeImpl<R> ensureValid(Chronology chrono, Temporal temporal) {

        @SuppressWarnings("unchecked")

        ChronoLocalDateTimeImpl<R> other = (ChronoLocalDateTimeImpl<R>) temporal;

        if (chrono.equals(other.getChronology()) == false) {

            throw new ClassCastException("Chronology mismatch, required: " + chrono.getId()

                    + ", actual: " + other.getChronology().getId());

        }

        return other;

    }

    /**

     * Constructor.

     *

     * @param date  the date part of the date-time, not null

     * @param time  the time part of the date-time, not null

     */

    private ChronoLocalDateTimeImpl(D date, LocalTime time) {

        Objects.requireNonNull(date, "date");

        Objects.requireNonNull(time, "time");

        this.date = date;

        this.time = time;

    }

    /**

     * Returns a copy of this date-time with the new date and time, checking

     * to see if a new object is in fact required.

     *

     * @param newDate  the date of the new date-time, not null

     * @param newTime  the time of the new date-time, not null

     * @return the date-time, not null

     */

    private ChronoLocalDateTimeImpl<D> with(Temporal newDate, LocalTime newTime) {

        if (date == newDate && time == newTime) {

            return this;

        }

        // Validate that the new Temporal is a ChronoLocalDate (and not something else)

        D cd = ChronoLocalDateImpl.ensureValid(date.getChronology(), newDate);

        return new ChronoLocalDateTimeImpl<>(cd, newTime);

    }

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

    @Override

    public D toLocalDate() {

        return date;

    }

    @Override

    public LocalTime toLocalTime() {

        return time;

    }

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

    @Override

    public boolean isSupported(TemporalField field) {

        if (field instanceof ChronoField) {

            ChronoField f = (ChronoField) field;

            return f.isDateBased() || f.isTimeBased();

        }

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

    }

    @Override

    public ValueRange range(TemporalField field) {

        if (field instanceof ChronoField) {

            ChronoField f = (ChronoField) field;

            return (f.isTimeBased() ? time.range(field) : date.range(field));

        }

        return field.rangeRefinedBy(this);

    }

    @Override

    public int get(TemporalField field) {

        if (field instanceof ChronoField) {

            ChronoField f = (ChronoField) field;

            return (f.isTimeBased() ? time.get(field) : date.get(field));

        }

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

    }

    @Override

    public long getLong(TemporalField field) {

        if (field instanceof ChronoField) {

            ChronoField f = (ChronoField) field;

            return (f.isTimeBased() ? time.getLong(field) : date.getLong(field));

        }

        return field.getFrom(this);

    }

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

    @SuppressWarnings("unchecked")

    @Override

    public ChronoLocalDateTimeImpl<D> with(TemporalAdjuster adjuster) {

        if (adjuster instanceof ChronoLocalDate) {

            // The Chronology is checked in with(date,time)

            return with((ChronoLocalDate) adjuster, time);

        } else if (adjuster instanceof LocalTime) {

            return with(date, (LocalTime) adjuster);

        } else if (adjuster instanceof ChronoLocalDateTimeImpl) {

            return ChronoLocalDateTimeImpl.ensureValid(date.getChronology(), (ChronoLocalDateTimeImpl<?>) adjuster);

        }

        return ChronoLocalDateTimeImpl.ensureValid(date.getChronology(), (ChronoLocalDateTimeImpl<?>) adjuster.adjustInto(this));

    }

    @Override

    public ChronoLocalDateTimeImpl<D> with(TemporalField field, long newValue) {

        if (field instanceof ChronoField) {

            ChronoField f = (ChronoField) field;

            if (f.isTimeBased()) {

                return with(date, time.with(field, newValue));

            } else {

                return with(date.with(field, newValue), time);

            }

        }

        return ChronoLocalDateTimeImpl.ensureValid(date.getChronology(), field.adjustInto(this, newValue));

    }

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

    @Override

    public ChronoLocalDateTimeImpl<D> plus(long amountToAdd, TemporalUnit unit) {

        if (unit instanceof ChronoUnit) {

            ChronoUnit f = (ChronoUnit) unit;

            switch (f) {

                case NANOS: return plusNanos(amountToAdd);

                case MICROS: return plusDays(amountToAdd / MICROS_PER_DAY).plusNanos((amountToAdd % MICROS_PER_DAY) * 1000);

                case MILLIS: return plusDays(amountToAdd / MILLIS_PER_DAY).plusNanos((amountToAdd % MILLIS_PER_DAY) * 1000000);

                case SECONDS: return plusSeconds(amountToAdd);

                case MINUTES: return plusMinutes(amountToAdd);

                case HOURS: return plusHours(amountToAdd);

                case HALF_DAYS: return plusDays(amountToAdd / 256).plusHours((amountToAdd % 256) * 12);  // no overflow (256 is multiple of 2)

            }

            return with(date.plus(amountToAdd, unit), time);

        }

        return ChronoLocalDateTimeImpl.ensureValid(date.getChronology(), unit.addTo(this, amountToAdd));

    }

    private ChronoLocalDateTimeImpl<D> plusDays(long days) {

        return with(date.plus(days, ChronoUnit.DAYS), time);

    }

    private ChronoLocalDateTimeImpl<D> plusHours(long hours) {

        return plusWithOverflow(date, hours, 0, 0, 0);

    }

    private ChronoLocalDateTimeImpl<D> plusMinutes(long minutes) {

        return plusWithOverflow(date, 0, minutes, 0, 0);

    }

    ChronoLocalDateTimeImpl<D> plusSeconds(long seconds) {

        return plusWithOverflow(date, 0, 0, seconds, 0);

    }

    private ChronoLocalDateTimeImpl<D> plusNanos(long nanos) {

        return plusWithOverflow(date, 0, 0, 0, nanos);

    }

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

    private ChronoLocalDateTimeImpl<D> plusWithOverflow(D newDate, long hours, long minutes, long seconds, long nanos) {

        // 9223372036854775808 long, 2147483648 int

        if ((hours | minutes | seconds | nanos) == 0) {

            return with(newDate, time);

        }

        long totDays = nanos / NANOS_PER_DAY +             //   max/24*60*60*1B

                seconds / SECONDS_PER_DAY +                //   max/24*60*60

                minutes / MINUTES_PER_DAY +                //   max/24*60

                hours / HOURS_PER_DAY;                     //   max/24

        long totNanos = nanos % NANOS_PER_DAY +                    //   max  86400000000000

                (seconds % SECONDS_PER_DAY) * NANOS_PER_SECOND +   //   max  86400000000000

                (minutes % MINUTES_PER_DAY) * NANOS_PER_MINUTE +   //   max  86400000000000

                (hours % HOURS_PER_DAY) * NANOS_PER_HOUR;          //   max  86400000000000

        long curNoD = time.toNanoOfDay();                          //   max  86400000000000

        totNanos = totNanos + curNoD;                              // total 432000000000000

        totDays += Math.floorDiv(totNanos, NANOS_PER_DAY);

        long newNoD = Math.floorMod(totNanos, NANOS_PER_DAY);

        LocalTime newTime = (newNoD == curNoD ? time : LocalTime.ofNanoOfDay(newNoD));

        return with(newDate.plus(totDays, ChronoUnit.DAYS), newTime);

    }

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

    @Override

    public ChronoZonedDateTime<D> atZone(ZoneId zone) {

        return ChronoZonedDateTimeImpl.ofBest(this, zone, null);

    }

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

    @Override

    public long until(Temporal endExclusive, TemporalUnit unit) {

        Objects.requireNonNull(endExclusive, "endExclusive");

        @SuppressWarnings("unchecked")

        ChronoLocalDateTime<D> end = (ChronoLocalDateTime<D>) getChronology().localDateTime(endExclusive);

        if (unit instanceof ChronoUnit) {

            if (unit.isTimeBased()) {

                long amount = end.getLong(EPOCH_DAY) - date.getLong(EPOCH_DAY);

                switch ((ChronoUnit) unit) {

                    case NANOS: amount = Math.multiplyExact(amount, NANOS_PER_DAY); break;

                    case MICROS: amount = Math.multiplyExact(amount, MICROS_PER_DAY); break;

                    case MILLIS: amount = Math.multiplyExact(amount, MILLIS_PER_DAY); break;

                    case SECONDS: amount = Math.multiplyExact(amount, SECONDS_PER_DAY); break;

                    case MINUTES: amount = Math.multiplyExact(amount, MINUTES_PER_DAY); break;

                    case HOURS: amount = Math.multiplyExact(amount, HOURS_PER_DAY); break;

                    case HALF_DAYS: amount = Math.multiplyExact(amount, 2); break;

                }

                return Math.addExact(amount, time.until(end.toLocalTime(), unit));

            }

            ChronoLocalDate endDate = end.toLocalDate();

            if (end.toLocalTime().isBefore(time)) {

                endDate = endDate.minus(1, ChronoUnit.DAYS);

            }

            return date.until(endDate, unit);

        }

        Objects.requireNonNull(unit, "unit");

        return unit.between(this, end);

    }

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

    /**

     * Writes the ChronoLocalDateTime using a

     * <a href="{@docRoot}/serialized-form.html#java.time.chrono.Ser">dedicated serialized form</a>.

     * @serialData

     * <pre>

     *  out.writeByte(2);              // identifies a ChronoLocalDateTime

     *  out.writeObject(toLocalDate());

     *  out.witeObject(toLocalTime());

     * </pre>

     *

     * @return the instance of {@code Ser}, not null

     */

    private Object writeReplace() {

        return new Ser(Ser.CHRONO_LOCAL_DATE_TIME_TYPE, this);

    }

    /**

     * Defend against malicious streams.

     *

     * @param s the stream to read

     * @throws InvalidObjectException always

     */

    private void readObject(ObjectInputStream s) throws InvalidObjectException {

        throw new InvalidObjectException("Deserialization via serialization delegate");

    }

    void writeExternal(ObjectOutput out) throws IOException {

        out.writeObject(date);

        out.writeObject(time);

    }

    static ChronoLocalDateTime<?> readExternal(ObjectInput in) throws IOException, ClassNotFoundException {

        ChronoLocalDate date = (ChronoLocalDate) in.readObject();

        LocalTime time = (LocalTime) in.readObject();

        return date.atTime(time);

    }

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

    @Override

    public boolean equals(Object obj) {

        if (this == obj) {

            return true;

        }

        if (obj instanceof ChronoLocalDateTime) {

            return compareTo((ChronoLocalDateTime<?>) obj) == 0;

        }

        return false;

    }

    @Override

    public int hashCode() {

        return toLocalDate().hashCode() ^ toLocalTime().hashCode();

    }

    @Override

    public String toString() {

        return toLocalDate().toString() + 'T' + toLocalTime().toString();

    }

}