/*
 *  Copyright 2001-2006 Stephen Colebourne
 *
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */
package org.joda.time;

import java.io.Serializable;
import java.util.Calendar;
import java.util.Date;
import java.util.Locale;

import org.joda.time.base.BasePartial;
import org.joda.time.chrono.ISOChronology;
import org.joda.time.field.AbstractPartialFieldProperty;
import org.joda.time.field.FieldUtils;
import org.joda.time.format.ISODateTimeFormat;

/**
 * TimeOfDay is an immutable partial supporting the hour, minute, second
 * and millisecond fields.
 * <p>
 * NOTE: This class only supports the four fields listed above. Thus, you
 * cannot query the millisOfDay or secondOfDay fields for example.
 * The new <code>LocalTime</code> class removes this restriction.
 * <p>
 * Calculations on TimeOfDay are performed using a {@link Chronology}.
 * This chronology is set to be in the UTC time zone for all calculations.
 * <p>
 * Each individual field can be queried in two ways:
 * <ul>
 * <li><code>getHourOfDay()</code>
 * <li><code>hourOfDay().get()</code>
 * </ul>
 * The second technique also provides access to other useful methods on the
 * field:
 * <ul>
 * <li>numeric value - <code>hourOfDay().get()</code>
 * <li>text value - <code>hourOfDay().getAsText()</code>
 * <li>short text value - <code>hourOfDay().getAsShortText()</code>
 * <li>maximum/minimum values - <code>hourOfDay().getMaximumValue()</code>
 * <li>add/subtract - <code>hourOfDay().addToCopy()</code>
 * <li>set - <code>hourOfDay().setCopy()</code>
 * </ul>
 * <p>
 * TimeOfDay is thread-safe and immutable, provided that the Chronology is as well.
 * All standard Chronology classes supplied are thread-safe and immutable.
 *
 * @author Stephen Colebourne
 * @author Brian S O'Neill
 * @since 1.0
 * @deprecated Use LocalTime which has a much better internal implementation and
 *  has been available since 1.3
 */
public final class TimeOfDay
        extends BasePartial
        implements ReadablePartial, Serializable {
    // NOTE: No toDateTime(YearMonthDay) as semantics are confusing when
    // different chronologies

    /** Serialization version */
    private static final long serialVersionUID = 3633353405803318660L;
    /** The singleton set of field types */
    private static final DateTimeFieldType[] FIELD_TYPES = new DateTimeFieldType[] {
        DateTimeFieldType.hourOfDay(),
        DateTimeFieldType.minuteOfHour(),
        DateTimeFieldType.secondOfMinute(),
        DateTimeFieldType.millisOfSecond(),
    };

    /** Constant for midnight. */
    public static final TimeOfDay MIDNIGHT = new TimeOfDay(0, 0, 0, 0);

    /** The index of the hourOfDay field in the field array */
    public static final int HOUR_OF_DAY = 0;
    /** The index of the minuteOfHour field in the field array */
    public static final int MINUTE_OF_HOUR = 1;
    /** The index of the secondOfMinute field in the field array */
    public static final int SECOND_OF_MINUTE = 2;
    /** The index of the millisOfSecond field in the field array */
    public static final int MILLIS_OF_SECOND = 3;

    //-----------------------------------------------------------------------
    /**
     * Constructs a TimeOfDay from a <code>java.util.Calendar</code>
     * using exactly the same field values avoiding any time zone effects.
     * <p>
     * Each field is queried from the Calendar and assigned to the TimeOfDay.
     * This is useful to ensure that the field values are the same in the
     * created TimeOfDay no matter what the time zone is. For example, if
     * the Calendar states that the time is 04:29, then the created TimeOfDay
     * will always have the time 04:29 irrespective of time zone issues.
     * <p>
     * This factory method ignores the type of the calendar and always
     * creates a TimeOfDay with ISO chronology.
     *
     * @param calendar  the Calendar to extract fields from
     * @return the created TimeOfDay
     * @throws IllegalArgumentException if the calendar is null
     * @throws IllegalArgumentException if the time is invalid for the ISO chronology
     * @since 1.2
     */
    public static TimeOfDay fromCalendarFields(Calendar calendar) {
        if (calendar == null) {
            throw new IllegalArgumentException("The calendar must not be null");
        }
        return new TimeOfDay(
            calendar.get(Calendar.HOUR_OF_DAY),
            calendar.get(Calendar.MINUTE),
            calendar.get(Calendar.SECOND),
            calendar.get(Calendar.MILLISECOND)
        );
    }

    /**
     * Constructs a TimeOfDay from a <code>java.util.Date</code>
     * using exactly the same field values avoiding any time zone effects.
     * <p>
     * Each field is queried from the Date and assigned to the TimeOfDay.
     * This is useful to ensure that the field values are the same in the
     * created TimeOfDay no matter what the time zone is. For example, if
     * the Calendar states that the time is 04:29, then the created TimeOfDay
     * will always have the time 04:29 irrespective of time zone issues.
     * <p>
     * This factory method always creates a TimeOfDay with ISO chronology.
     *
     * @param date  the Date to extract fields from
     * @return the created TimeOfDay
     * @throws IllegalArgumentException if the calendar is null
     * @throws IllegalArgumentException if the date is invalid for the ISO chronology
     * @since 1.2
     */
    public static TimeOfDay fromDateFields(Date date) {
        if (date == null) {
            throw new IllegalArgumentException("The date must not be null");
        }
        return new TimeOfDay(
            date.getHours(),
            date.getMinutes(),
            date.getSeconds(),
            (int) (date.getTime() % 1000)
        );
    }

    //-----------------------------------------------------------------------
    /**
     * Constructs a TimeOfDay from the specified millis of day using the
     * ISO chronology.
     * <p>
     * The millisOfDay value may exceed the number of millis in one day,
     * but additional days will be ignored.
     * This method uses the UTC time zone internally.
     *
     * @param millisOfDay  the number of milliseconds into a day to convert
     */
    public static TimeOfDay fromMillisOfDay(long millisOfDay) {
        return fromMillisOfDay(millisOfDay, null);
    }

    /**
     * Constructs a TimeOfDay from the specified millis of day using the
     * specified chronology.
     * <p>
     * The millisOfDay value may exceed the number of millis in one day,
     * but additional days will be ignored.
     * This method uses the UTC time zone internally.
     *
     * @param millisOfDay  the number of milliseconds into a day to convert
     * @param chrono  the chronology, null means ISO chronology
     */
    public static TimeOfDay fromMillisOfDay(long millisOfDay, Chronology chrono) {
        chrono = DateTimeUtils.getChronology(chrono);
        chrono = chrono.withUTC();
        return new TimeOfDay(millisOfDay, chrono);
    }

    // Constructors
    //-----------------------------------------------------------------------
    /**
     * Constructs a TimeOfDay with the current time, using ISOChronology in
     * the default zone to extract the fields.
     * <p>
     * The constructor uses the default time zone, resulting in the local time
     * being initialised. Once the constructor is complete, all further calculations
     * are performed without reference to a timezone (by switching to UTC).
     */
    public TimeOfDay() {
        super();
    }

    /**
     * Constructs a TimeOfDay with the current time, using ISOChronology in
     * the specified zone to extract the fields.
     * <p>
     * The constructor uses the specified time zone to obtain the current time.
     * Once the constructor is complete, all further calculations
     * are performed without reference to a timezone (by switching to UTC).
     * 
     * @param zone  the zone to use, null means default zone
     * @since 1.1
     */
    public TimeOfDay(DateTimeZone zone) {
        super(ISOChronology.getInstance(zone));
    }

    /**
     * Constructs a TimeOfDay with the current time, using the specified chronology
     * and zone to extract the fields.
     * <p>
     * The constructor uses the time zone of the chronology specified.
     * Once the constructor is complete, all further calculations are performed
     * without reference to a timezone (by switching to UTC).
     *
     * @param chronology  the chronology, null means ISOChronology in the default zone
     */
    public TimeOfDay(Chronology chronology) {
        super(chronology);
    }

    /**
     * Constructs a TimeOfDay extracting the partial fields from the specified
     * milliseconds using the ISOChronology in the default zone.
     * <p>
     * The constructor uses the default time zone, resulting in the local time
     * being initialised. Once the constructor is complete, all further calculations
     * are performed without reference to a timezone (by switching to UTC).
     *
     * @param instant  the milliseconds from 1970-01-01T00:00:00Z
     */
    public TimeOfDay(long instant) {
        super(instant);
    }

    /**
     * Constructs a TimeOfDay extracting the partial fields from the specified
     * milliseconds using the chronology provided.
     * <p>
     * The constructor uses the time zone of the chronology specified.
     * Once the constructor is complete, all further calculations are performed
     * without reference to a timezone (by switching to UTC).
     *
     * @param instant  the milliseconds from 1970-01-01T00:00:00Z
     * @param chronology  the chronology, null means ISOChronology in the default zone
     */
    public TimeOfDay(long instant, Chronology chronology) {
        super(instant, chronology);
    }

    /**
     * Constructs a TimeOfDay from an Object that represents a time.
     * <p>
     * The recognised object types are defined in
     * {@link org.joda.time.convert.ConverterManager ConverterManager} and
     * include ReadableInstant, String, Calendar and Date.
     * The String formats are described by {@link ISODateTimeFormat#timeParser()}.
     * <p>
     * The chronology used will be derived from the object, defaulting to ISO.
     * <p>
     * NOTE: Prior to v1.3 the string format was described by
     * {@link ISODateTimeFormat#dateTimeParser()}. Dates are now rejected.
     *
     * @param instant  the datetime object, null means now
     * @throws IllegalArgumentException if the instant is invalid
     */
    public TimeOfDay(Object instant) {
        super(instant, null, ISODateTimeFormat.timeParser());
    }

    /**
     * Constructs a TimeOfDay from an Object that represents a time, using the
     * specified chronology.
     * <p>
     * The recognised object types are defined in
     * {@link org.joda.time.convert.ConverterManager ConverterManager} and
     * include ReadableInstant, String, Calendar and Date.
     * The String formats are described by {@link ISODateTimeFormat#timeParser()}.
     * <p>
     * The constructor uses the time zone of the chronology specified.
     * Once the constructor is complete, all further calculations are performed
     * without reference to a timezone (by switching to UTC).
     * The specified chronology overrides that of the object.
     * <p>
     * NOTE: Prior to v1.3 the string format was described by
     * {@link ISODateTimeFormat#dateTimeParser()}. Dates are now rejected.
     *
     * @param instant  the datetime object, null means now
     * @param chronology  the chronology, null means ISO default
     * @throws IllegalArgumentException if the instant is invalid
     */
    public TimeOfDay(Object instant, Chronology chronology) {
        super(instant, DateTimeUtils.getChronology(chronology), ISODateTimeFormat.timeParser());
    }

    /**
     * Constructs a TimeOfDay with specified hour and minute and zero seconds and milliseconds
     * using <code>ISOChronology</code> in the default zone.
     * <p>
     * The constructor uses the no time zone initialising the fields as provided.
     * Once the constructor is complete, all further calculations
     * are performed without reference to a timezone (by switching to UTC).
     *
     * @param hourOfDay  the hour of the day
     * @param minuteOfHour  the minute of the hour
     */
    public TimeOfDay(int hourOfDay, int minuteOfHour) {
        this(hourOfDay, minuteOfHour, 0, 0, null);
    }

    /**
     * Constructs a TimeOfDay with specified hour and minute and zero seconds and milliseconds.
     * <p>
     * The constructor uses the time zone of the chronology specified.
     * Once the constructor is complete, all further calculations are performed
     * without reference to a timezone (by switching to UTC).
     *
     * @param hourOfDay  the hour of the day
     * @param minuteOfHour  the minute of the hour
     * @param chronology  the chronology, null means ISOChronology in the default zone
     */
    public TimeOfDay(int hourOfDay, int minuteOfHour, Chronology chronology) {
        this(hourOfDay, minuteOfHour, 0, 0, chronology);
    }

    /**
     * Constructs a TimeOfDay with specified time field values and zero milliseconds
     * using <code>ISOChronology</code> in the default zone.
     * <p>
     * The constructor uses the no time zone initialising the fields as provided.
     * Once the constructor is complete, all further calculations
     * are performed without reference to a timezone (by switching to UTC).
     *
     * @param hourOfDay  the hour of the day
     * @param minuteOfHour  the minute of the hour
     * @param secondOfMinute  the second of the minute
     */
    public TimeOfDay(int hourOfDay, int minuteOfHour, int secondOfMinute) {
        this(hourOfDay, minuteOfHour, secondOfMinute, 0, null);
    }

    /**
     * Constructs a TimeOfDay with specified time field values and zero milliseconds.
     * <p>
     * The constructor uses the time zone of the chronology specified.
     * Once the constructor is complete, all further calculations are performed
     * without reference to a timezone (by switching to UTC).
     *
     * @param hourOfDay  the hour of the day
     * @param minuteOfHour  the minute of the hour
     * @param secondOfMinute  the second of the minute
     * @param chronology  the chronology, null means ISOChronology in the default zone
     */
    public TimeOfDay(int hourOfDay, int minuteOfHour, int secondOfMinute, Chronology chronology) {
        this(hourOfDay, minuteOfHour, secondOfMinute, 0, chronology);
    }

    /**
     * Constructs a TimeOfDay with specified time field values using
     * <code>ISOChronology</code> in the default zone.
     * <p>
     * The constructor uses the no time zone initialising the fields as provided.
     * Once the constructor is complete, all further calculations
     * are performed without reference to a timezone (by switching to UTC).
     *
     * @param hourOfDay  the hour of the day
     * @param minuteOfHour  the minute of the hour
     * @param secondOfMinute  the second of the minute
     * @param millisOfSecond  the millisecond of the second
     */
    public TimeOfDay(int hourOfDay, int minuteOfHour, int secondOfMinute, int millisOfSecond) {
        this(hourOfDay, minuteOfHour, secondOfMinute, millisOfSecond, null);
    }

    /**
     * Constructs a TimeOfDay with specified time field values and chronology.
     * <p>
     * The constructor uses the time zone of the chronology specified.
     * Once the constructor is complete, all further calculations are performed
     * without reference to a timezone (by switching to UTC).
     *
     * @param hourOfDay  the hour of the day
     * @param minuteOfHour  the minute of the hour
     * @param secondOfMinute  the second of the minute
     * @param millisOfSecond  the millisecond of the second
     * @param chronology  the chronology, null means ISOChronology in the default zone
     */
    public TimeOfDay(int hourOfDay, int minuteOfHour,
            int secondOfMinute, int millisOfSecond, Chronology chronology) {
        super(new int[] {hourOfDay, minuteOfHour, secondOfMinute, millisOfSecond}, chronology);
    }

    /**
     * Constructs a TimeOfDay with chronology from this instance and new values.
     *
     * @param partial  the partial to base this new instance on
     * @param values  the new set of values
     */
    TimeOfDay(TimeOfDay partial, int[] values) {
        super(partial, values);
    }

    /**
     * Constructs a TimeOfDay with values from this instance and a new chronology.
     *
     * @param partial  the partial to base this new instance on
     * @param chrono  the new chronology
     */
    TimeOfDay(TimeOfDay partial, Chronology chrono) {
        super(partial, chrono);
    }

    //-----------------------------------------------------------------------
    /**
     * Gets the number of fields in this partial.
     * 
     * @return the field count
     */
    public int size() {
        return 4;
    }

    /**
     * Gets the field for a specific index in the chronology specified.
     * <p>
     * This method must not use any instance variables.
     * 
     * @param index  the index to retrieve
     * @param chrono  the chronology to use
     * @return the field
     */
    protected DateTimeField getField(int index, Chronology chrono) {
        switch (index) {
            case HOUR_OF_DAY:
                return chrono.hourOfDay();
            case MINUTE_OF_HOUR:
                return chrono.minuteOfHour();
            case SECOND_OF_MINUTE:
                return chrono.secondOfMinute();
            case MILLIS_OF_SECOND:
                return chrono.millisOfSecond();
            default:
                throw new IndexOutOfBoundsException("Invalid index: " + index);
        }
    }

    /**
     * Gets the field type at the specified index.
     *
     * @param index  the index to retrieve
     * @return the field at the specified index
     * @throws IndexOutOfBoundsException if the index is invalid
     */
    public DateTimeFieldType getFieldType(int index) {
        return FIELD_TYPES[index];
    }

    /**
     * Gets an array of the field type of each of the fields that this partial supports.
     * <p>
     * The fields are returned largest to smallest, Hour, Minute, Second, Millis.
     *
     * @return the array of field types (cloned), largest to smallest
     */
    public DateTimeFieldType[] getFieldTypes() {
        return (DateTimeFieldType[]) FIELD_TYPES.clone();
    }

    //-----------------------------------------------------------------------
    /**
     * Returns a copy of this time with the specified chronology.
     * This instance is immutable and unaffected by this method call.
     * <p>
     * This method retains the values of the fields, thus the result will
     * typically refer to a different instant.
     * <p>
     * The time zone of the specified chronology is ignored, as TimeOfDay
     * operates without a time zone.
     *
     * @param newChronology  the new chronology, null means ISO
     * @return a copy of this datetime with a different chronology
     * @throws IllegalArgumentException if the values are invalid for the new chronology
     */
    public TimeOfDay withChronologyRetainFields(Chronology newChronology) {
        newChronology = DateTimeUtils.getChronology(newChronology);
        newChronology = newChronology.withUTC();
        if (newChronology == getChronology()) {
            return this;
        } else {
            TimeOfDay newTimeOfDay = new TimeOfDay(this, newChronology);
            newChronology.validate(newTimeOfDay, getValues());
            return newTimeOfDay;
        }
    }

    /**
     * Returns a copy of this time with the specified field set to a new value.
     * <p>
     * For example, if the field type is <code>minuteOfHour</code> then the day
     * would be changed in the returned instance.
     * <p>
     * These three lines are equivalent:
     * <pre>
     * TimeOfDay updated = tod.withField(DateTimeFieldType.minuteOfHour(), 6);
     * TimeOfDay updated = tod.minuteOfHour().setCopy(6);
     * TimeOfDay updated = tod.property(DateTimeFieldType.minuteOfHour()).setCopy(6);
     * </pre>
     *
     * @param fieldType  the field type to set, not null
     * @param value  the value to set
     * @return a copy of this instance with the field set
     * @throws IllegalArgumentException if the value is null or invalid
     */
    public TimeOfDay withField(DateTimeFieldType fieldType, int value) {
        int index = indexOfSupported(fieldType);
        if (value == getValue(index)) {
            return this;
        }
        int[] newValues = getValues();
        newValues = getField(index).set(this, index, newValues, value);
        return new TimeOfDay(this, newValues);
    }

    /**
     * Returns a copy of this time with the value of the specified field increased,
     * wrapping to what would be a new day if required.
     * <p>
     * If the addition is zero, then <code>this</code> is returned.
     * <p>
     * These three lines are equivalent:
     * <pre>
     * TimeOfDay added = tod.withFieldAdded(DurationFieldType.minutes(), 6);
     * TimeOfDay added = tod.plusMinutes(6);
     * TimeOfDay added = tod.minuteOfHour().addToCopy(6);
     * </pre>
     * 
     * @param fieldType  the field type to add to, not null
     * @param amount  the amount to add
     * @return a copy of this instance with the field updated
     * @throws IllegalArgumentException if the value is null or invalid
     * @throws ArithmeticException if the new datetime exceeds the capacity
     */
    public TimeOfDay withFieldAdded(DurationFieldType fieldType, int amount) {
        int index = indexOfSupported(fieldType);
        if (amount == 0) {
            return this;
        }
        int[] newValues = getValues();
        newValues = getField(index).addWrapPartial(this, index, newValues, amount);
        return new TimeOfDay(this, newValues);
    }

    /**
     * Returns a copy of this time with the specified period added,
     * wrapping to what would be a new day if required.
     * <p>
     * If the addition is zero, then <code>this</code> is returned.
     * Fields in the period that aren't present in the partial are ignored.
     * <p>
     * This method is typically used to add multiple copies of complex
     * period instances. Adding one field is best achieved using methods
     * like {@link #withFieldAdded(DurationFieldType, int)}
     * or {@link #plusHours(int)}.
     * 
     * @param period  the period to add to this one, null means zero
     * @param scalar  the amount of times to add, such as -1 to subtract once
     * @return a copy of this instance with the period added
     * @throws ArithmeticException if the new datetime exceeds the capacity
     */
    public TimeOfDay withPeriodAdded(ReadablePeriod period, int scalar) {
        if (period == null || scalar == 0) {
            return this;
        }
        int[] newValues = getValues();
        for (int i = 0; i < period.size(); i++) {
            DurationFieldType fieldType = period.getFieldType(i);
            int index = indexOf(fieldType);
            if (index >= 0) {
                newValues = getField(index).addWrapPartial(this, index, newValues,
                        FieldUtils.safeMultiply(period.getValue(i), scalar));
            }
        }
        return new TimeOfDay(this, newValues);
    }

    //-----------------------------------------------------------------------
    /**
     * Returns a copy of this time with the specified period added,
     * wrapping to what would be a new day if required.
     * <p>
     * If the amount is zero or null, then <code>this</code> is returned.
     * <p>
     * This method is typically used to add complex period instances.
     * Adding one field is best achieved using methods
     * like {@link #plusHours(int)}.
     * 
     * @param period  the duration to add to this one, null means zero
     * @return a copy of this instance with the period added
     * @throws ArithmeticException if the new datetime exceeds the capacity of a long
     */
    public TimeOfDay plus(ReadablePeriod period) {
        return withPeriodAdded(period, 1);
    }

    //-----------------------------------------------------------------------
    /**
     * Returns a copy of this time plus the specified number of hours.
     * <p>
     * This time instance is immutable and unaffected by this method call.
     * <p>
     * The following three lines are identical in effect:
     * <pre>
     * TimeOfDay added = dt.plusHours(6);
     * TimeOfDay added = dt.plus(Period.hours(6));
     * TimeOfDay added = dt.withFieldAdded(DurationFieldType.hours(), 6);
     * </pre>
     *
     * @param hours  the amount of hours to add, may be negative
     * @return the new time plus the increased hours
     * @since 1.1
     */
    public TimeOfDay plusHours(int hours) {
        return withFieldAdded(DurationFieldType.hours(), hours);
    }

    /**
     * Returns a copy of this time plus the specified number of minutes.
     * <p>
     * This time instance is immutable and unaffected by this method call.
     * <p>
     * The following three lines are identical in effect:
     * <pre>
     * TimeOfDay added = dt.plusMinutes(6);
     * TimeOfDay added = dt.plus(Period.minutes(6));
     * TimeOfDay added = dt.withFieldAdded(DurationFieldType.minutes(), 6);
     * </pre>
     *
     * @param minutes  the amount of minutes to add, may be negative
     * @return the new time plus the increased minutes
     * @since 1.1
     */
    public TimeOfDay plusMinutes(int minutes) {
        return withFieldAdded(DurationFieldType.minutes(), minutes);
    }

    /**
     * Returns a copy of this time plus the specified number of seconds.
     * <p>
     * This time instance is immutable and unaffected by this method call.
     * <p>
     * The following three lines are identical in effect:
     * <pre>
     * TimeOfDay added = dt.plusSeconds(6);
     * TimeOfDay added = dt.plus(Period.seconds(6));
     * TimeOfDay added = dt.withFieldAdded(DurationFieldType.seconds(), 6);
     * </pre>
     *
     * @param seconds  the amount of seconds to add, may be negative
     * @return the new time plus the increased seconds
     * @since 1.1
     */
    public TimeOfDay plusSeconds(int seconds) {
        return withFieldAdded(DurationFieldType.seconds(), seconds);
    }

    /**
     * Returns a copy of this time plus the specified number of millis.
     * <p>
     * This time instance is immutable and unaffected by this method call.
     * <p>
     * The following three lines are identical in effect:
     * <pre>
     * TimeOfDay added = dt.plusMillis(6);
     * TimeOfDay added = dt.plus(Period.millis(6));
     * TimeOfDay added = dt.withFieldAdded(DurationFieldType.millis(), 6);
     * </pre>
     *
     * @param millis  the amount of millis to add, may be negative
     * @return the new time plus the increased millis
     * @since 1.1
     */
    public TimeOfDay plusMillis(int millis) {
        return withFieldAdded(DurationFieldType.millis(), millis);
    }

    //-----------------------------------------------------------------------
    /**
     * Returns a copy of this time with the specified period taken away,
     * wrapping to what would be a new day if required.
     * <p>
     * If the amount is zero or null, then <code>this</code> is returned.
     * <p>
     * This method is typically used to subtract complex period instances.
     * Subtracting one field is best achieved using methods
     * like {@link #minusHours(int)}.
     * 
     * @param period  the period to reduce this instant by
     * @return a copy of this instance with the period taken away
     * @throws ArithmeticException if the new time exceeds capacity
     */
    public TimeOfDay minus(ReadablePeriod period) {
        return withPeriodAdded(period, -1);
    }

    //-----------------------------------------------------------------------
    /**
     * Returns a copy of this time minus the specified number of hours.
     * <p>
     * This time instance is immutable and unaffected by this method call.
     * <p>
     * The following three lines are identical in effect:
     * <pre>
     * TimeOfDay subtracted = dt.minusHours(6);
     * TimeOfDay subtracted = dt.minus(Period.hours(6));
     * TimeOfDay subtracted = dt.withFieldAdded(DurationFieldType.hours(), -6);
     * </pre>
     *
     * @param hours  the amount of hours to subtract, may be negative
     * @return the new time minus the increased hours
     * @since 1.1
     */
    public TimeOfDay minusHours(int hours) {
        return withFieldAdded(DurationFieldType.hours(), FieldUtils.safeNegate(hours));
    }

    /**
     * Returns a copy of this time minus the specified number of minutes.
     * <p>
     * This time instance is immutable and unaffected by this method call.
     * <p>
     * The following three lines are identical in effect:
     * <pre>
     * TimeOfDay subtracted = dt.minusMinutes(6);
     * TimeOfDay subtracted = dt.minus(Period.minutes(6));
     * TimeOfDay subtracted = dt.withFieldAdded(DurationFieldType.minutes(), -6);
     * </pre>
     *
     * @param minutes  the amount of minutes to subtract, may be negative
     * @return the new time minus the increased minutes
     * @since 1.1
     */
    public TimeOfDay minusMinutes(int minutes) {
        return withFieldAdded(DurationFieldType.minutes(), FieldUtils.safeNegate(minutes));
    }

    /**
     * Returns a copy of this time minus the specified number of seconds.
     * <p>
     * This time instance is immutable and unaffected by this method call.
     * <p>
     * The following three lines are identical in effect:
     * <pre>
     * TimeOfDay subtracted = dt.minusSeconds(6);
     * TimeOfDay subtracted = dt.minus(Period.seconds(6));
     * TimeOfDay subtracted = dt.withFieldAdded(DurationFieldType.seconds(), -6);
     * </pre>
     *
     * @param seconds  the amount of seconds to subtract, may be negative
     * @return the new time minus the increased seconds
     * @since 1.1
     */
    public TimeOfDay minusSeconds(int seconds) {
        return withFieldAdded(DurationFieldType.seconds(), FieldUtils.safeNegate(seconds));
    }

    /**
     * Returns a copy of this time minus the specified number of millis.
     * <p>
     * This time instance is immutable and unaffected by this method call.
     * <p>
     * The following three lines are identical in effect:
     * <pre>
     * TimeOfDay subtracted = dt.minusMillis(6);
     * TimeOfDay subtracted = dt.minus(Period.millis(6));
     * TimeOfDay subtracted = dt.withFieldAdded(DurationFieldType.millis(), -6);
     * </pre>
     *
     * @param millis  the amount of millis to subtract, may be negative
     * @return the new time minus the increased millis
     * @since 1.1
     */
    public TimeOfDay minusMillis(int millis) {
        return withFieldAdded(DurationFieldType.millis(), FieldUtils.safeNegate(millis));
    }

    //-----------------------------------------------------------------------
    /**
     * Gets the property object for the specified type, which contains
     * many useful methods.
     *
     * @param type  the field type to get the property for
     * @return the property object
     * @throws IllegalArgumentException if the field is null or unsupported
     */
    public Property property(DateTimeFieldType type) {
        return new Property(this, indexOfSupported(type));
    }

    //-----------------------------------------------------------------------
    /**
     * Converts this object to a LocalTime with the same time and chronology.
     *
     * @return a LocalTime with the same time and chronology
     * @since 1.3
     */
    public LocalTime toLocalTime() {
        return new LocalTime(getHourOfDay(), getMinuteOfHour(),
                getSecondOfMinute(), getMillisOfSecond(), getChronology());
    }

    //-----------------------------------------------------------------------
    /**
     * Converts this partial to a full datetime using the default time zone
     * setting the time fields from this instance and the date fields from
     * the current time.
     *
     * @return this date as a datetime with the time as the current time
     */
    public DateTime toDateTimeToday() {
        return toDateTimeToday(null);
    }

    /**
     * Converts this partial to a full datetime using the specified time zone
     * setting the time fields from this instance and the date fields from
     * the current time.
     * <p>
     * This method uses the chronology from this instance plus the time zone
     * specified.
     *
     * @param zone  the zone to use, null means default
     * @return this date as a datetime with the time as the current time
     */
    public DateTime toDateTimeToday(DateTimeZone zone) {
        Chronology chrono = getChronology().withZone(zone);
        long instantMillis = DateTimeUtils.currentTimeMillis();
        long resolved = chrono.set(this, instantMillis);
        return new DateTime(resolved, chrono);
    }

    //-----------------------------------------------------------------------
    /**
     * Get the hour of day (0-23) field value.
     *
     * @return the hour of day
     */
    public int getHourOfDay() {
        return getValue(HOUR_OF_DAY);
    }

    /**
     * Get the minute of hour field value.
     *
     * @return the minute of hour
     */
    public int getMinuteOfHour() {
        return getValue(MINUTE_OF_HOUR);
    }

    /**
     * Get the second of minute field value.
     *
     * @return the second of minute
     */
    public int getSecondOfMinute() {
        return getValue(SECOND_OF_MINUTE);
    }

    /**
     * Get the millis of second field value.
     *
     * @return the millis of second
     */
    public int getMillisOfSecond() {
        return getValue(MILLIS_OF_SECOND);
    }

    //-----------------------------------------------------------------------
    /**
     * Returns a copy of this time with the hour of day field updated.
     * <p>
     * TimeOfDay is immutable, so there are no set methods.
     * Instead, this method returns a new instance with the value of
     * hour of day changed.
     *
     * @param hour  the hour of day to set
     * @return a copy of this object with the field set
     * @throws IllegalArgumentException if the value is invalid
     * @since 1.3
     */
    public TimeOfDay withHourOfDay(int hour) {
        int[] newValues = getValues();
        newValues = getChronology().hourOfDay().set(this, HOUR_OF_DAY, newValues, hour);
        return new TimeOfDay(this, newValues);
    }

    /**
     * Returns a copy of this time with the minute of hour field updated.
     * <p>
     * TimeOfDay is immutable, so there are no set methods.
     * Instead, this method returns a new instance with the value of
     * minute of hour changed.
     *
     * @param minute  the minute of hour to set
     * @return a copy of this object with the field set
     * @throws IllegalArgumentException if the value is invalid
     * @since 1.3
     */
    public TimeOfDay withMinuteOfHour(int minute) {
        int[] newValues = getValues();
        newValues = getChronology().minuteOfHour().set(this, MINUTE_OF_HOUR, newValues, minute);
        return new TimeOfDay(this, newValues);
    }

    /**
     * Returns a copy of this time with the second of minute field updated.
     * <p>
     * TimeOfDay is immutable, so there are no set methods.
     * Instead, this method returns a new instance with the value of
     * second of minute changed.
     *
     * @param second  the second of minute to set
     * @return a copy of this object with the field set
     * @throws IllegalArgumentException if the value is invalid
     * @since 1.3
     */
    public TimeOfDay withSecondOfMinute(int second) {
        int[] newValues = getValues();
        newValues = getChronology().secondOfMinute().set(this, SECOND_OF_MINUTE, newValues, second);
        return new TimeOfDay(this, newValues);
    }

    /**
     * Returns a copy of this time with the millis of second field updated.
     * <p>
     * TimeOfDay is immutable, so there are no set methods.
     * Instead, this method returns a new instance with the value of
     * millis of second changed.
     *
     * @param millis  the millis of second to set
     * @return a copy of this object with the field set
     * @throws IllegalArgumentException if the value is invalid
     * @since 1.3
     */
    public TimeOfDay withMillisOfSecond(int millis) {
        int[] newValues = getValues();
        newValues = getChronology().millisOfSecond().set(this, MILLIS_OF_SECOND, newValues, millis);
        return new TimeOfDay(this, newValues);
    }

    //-----------------------------------------------------------------------
    /**
     * Get the hour of day field property which provides access to advanced functionality.
     * 
     * @return the hour of day property
     */
    public Property hourOfDay() {
        return new Property(this, HOUR_OF_DAY);
    }

    /**
     * Get the minute of hour field property which provides access to advanced functionality.
     * 
     * @return the minute of hour property
     */
    public Property minuteOfHour() {
        return new Property(this, MINUTE_OF_HOUR);
    }

    /**
     * Get the second of minute field property which provides access to advanced functionality.
     * 
     * @return the second of minute property
     */
    public Property secondOfMinute() {
        return new Property(this, SECOND_OF_MINUTE);
    }

    /**
     * Get the millis of second property which provides access to advanced functionality.
     * 
     * @return the millis of second property
     */
    public Property millisOfSecond() {
        return new Property(this, MILLIS_OF_SECOND);
    }

    //-----------------------------------------------------------------------
    /**
     * Output the time in the ISO8601 format THH:mm:ss.SSS.
     * 
     * @return ISO8601 formatted string
     */
    public String toString() {
        return ISODateTimeFormat.tTime().print(this);
    }

    //-----------------------------------------------------------------------
    /**
     * The property class for <code>TimeOfDay</code>.
     * <p>
     * This class binds a <code>TimeOfDay</code> to a <code>DateTimeField</code>.
     * 
     * @author Stephen Colebourne
     * @since 1.0
     * @deprecated Use LocalTime which has a much better internal implementation
     */
    public static class Property extends AbstractPartialFieldProperty implements Serializable {

        /** Serialization version */
        private static final long serialVersionUID = 5598459141741063833L;

        /** The partial */
        private final TimeOfDay iTimeOfDay;
        /** The field index */
        private final int iFieldIndex;

        /**
         * Constructs a property.
         * 
         * @param partial  the partial instance
         * @param fieldIndex  the index in the partial
         */
        Property(TimeOfDay partial, int fieldIndex) {
            super();
            iTimeOfDay = partial;
            iFieldIndex = fieldIndex;
        }

        /**
         * Gets the field that this property uses.
         * 
         * @return the field
         */
        public DateTimeField getField() {
            return iTimeOfDay.getField(iFieldIndex);
        }

        /**
         * Gets the partial that this property belongs to.
         * 
         * @return the partial
         */
        protected ReadablePartial getReadablePartial() {
            return iTimeOfDay;
        }

        /**
         * Gets the partial that this property belongs to.
         * 
         * @return the partial
         */
        public TimeOfDay getTimeOfDay() {
            return iTimeOfDay;
        }

        /**
         * Gets the value of this field.
         * 
         * @return the field value
         */
        public int get() {
            return iTimeOfDay.getValue(iFieldIndex);
        }

        //-----------------------------------------------------------------------
        /**
         * Adds to the value of this field in a copy of this TimeOfDay,
         * wrapping to what would be the next day if necessary.
         * <p>
         * The value will be added to this field. If the value is too large to be
         * added solely to this field then it will affect larger fields.
         * Smaller fields are unaffected.
         * <p>
         * If the result would be too large, beyond 23:59:59:999, then the
         * calculation wraps to 00:00:00.000. For the alternate strict behaviour
         * with no wrapping see {@link #addNoWrapToCopy(int)}.
         * <p>
         * The TimeOfDay attached to this property is unchanged by this call.
         * Instead, a new instance is returned.
         * 
         * @param valueToAdd  the value to add to the field in the copy
         * @return a copy of the TimeOfDay with the field value changed
         * @throws IllegalArgumentException if the value isn't valid
         */
        public TimeOfDay addToCopy(int valueToAdd) {
            int[] newValues = iTimeOfDay.getValues();
            newValues = getField().addWrapPartial(iTimeOfDay, iFieldIndex, newValues, valueToAdd);
            return new TimeOfDay(iTimeOfDay, newValues);
        }

        /**
         * Adds to the value of this field in a copy of this TimeOfDay,
         * throwing an Exception if the bounds are exceeded.
         * <p>
         * The value will be added to this field. If the value is too large to be
         * added solely to this field then it will affect larger fields.
         * Smaller fields are unaffected.
         * <p>
         * If the result would be too large (beyond 23:59:59:999) or too
         * small (less than 00:00:00.000) then an Execption is thrown.
         * For the alternate behaviour which wraps to the next 'day',
         * see {@link #addToCopy(int)}.
         * <p>
         * The TimeOfDay attached to this property is unchanged by this call.
         * Instead, a new instance is returned.
         * 
         * @param valueToAdd  the value to add to the field in the copy
         * @return a copy of the TimeOfDay with the field value changed
         * @throws IllegalArgumentException if the value isn't valid
         */
        public TimeOfDay addNoWrapToCopy(int valueToAdd) {
            int[] newValues = iTimeOfDay.getValues();
            newValues = getField().add(iTimeOfDay, iFieldIndex, newValues, valueToAdd);
            return new TimeOfDay(iTimeOfDay, newValues);
        }

        /**
         * Adds to the value of this field in a copy of this TimeOfDay wrapping
         * within this field if the maximum value is reached.
         * <p>
         * The value will be added to this field. If the value is too large to be
         * added solely to this field then it wraps within this field.
         * Other fields are unaffected.
         * <p>
         * For example,
         * <code>12:59:37</code> addWrapField one minute returns <code>12:00:37</code>.
         * <p>
         * The TimeOfDay attached to this property is unchanged by this call.
         * Instead, a new instance is returned.
         * 
         * @param valueToAdd  the value to add to the field in the copy
         * @return a copy of the TimeOfDay with the field value changed
         * @throws IllegalArgumentException if the value isn't valid
         */
        public TimeOfDay addWrapFieldToCopy(int valueToAdd) {
            int[] newValues = iTimeOfDay.getValues();
            newValues = getField().addWrapField(iTimeOfDay, iFieldIndex, newValues, valueToAdd);
            return new TimeOfDay(iTimeOfDay, newValues);
        }

        //-----------------------------------------------------------------------
        /**
         * Sets this field in a copy of the TimeOfDay.
         * <p>
         * The TimeOfDay attached to this property is unchanged by this call.
         * Instead, a new instance is returned.
         * 
         * @param value  the value to set the field in the copy to
         * @return a copy of the TimeOfDay with the field value changed
         * @throws IllegalArgumentException if the value isn't valid
         */
        public TimeOfDay setCopy(int value) {
            int[] newValues = iTimeOfDay.getValues();
            newValues = getField().set(iTimeOfDay, iFieldIndex, newValues, value);
            return new TimeOfDay(iTimeOfDay, newValues);
        }

        /**
         * Sets this field in a copy of the TimeOfDay to a parsed text value.
         * <p>
         * The TimeOfDay attached to this property is unchanged by this call.
         * Instead, a new instance is returned.
         * 
         * @param text  the text value to set
         * @param locale  optional locale to use for selecting a text symbol
         * @return a copy of the TimeOfDay with the field value changed
         * @throws IllegalArgumentException if the text value isn't valid
         */
        public TimeOfDay setCopy(String text, Locale locale) {
            int[] newValues = iTimeOfDay.getValues();
            newValues = getField().set(iTimeOfDay, iFieldIndex, newValues, text, locale);
            return new TimeOfDay(iTimeOfDay, newValues);
        }

        /**
         * Sets this field in a copy of the TimeOfDay to a parsed text value.
         * <p>
         * The TimeOfDay attached to this property is unchanged by this call.
         * Instead, a new instance is returned.
         * 
         * @param text  the text value to set
         * @return a copy of the TimeOfDay with the field value changed
         * @throws IllegalArgumentException if the text value isn't valid
         */
        public TimeOfDay setCopy(String text) {
            return setCopy(text, null);
        }

        //-----------------------------------------------------------------------
        /**
         * Returns a new TimeOfDay with this field set to the maximum value
         * for this field.
         * <p>
         * The TimeOfDay attached to this property is unchanged by this call.
         *
         * @return a copy of the TimeOfDay with this field set to its maximum
         * @since 1.2
         */
        public TimeOfDay withMaximumValue() {
            return setCopy(getMaximumValue());
        }

        /**
         * Returns a new TimeOfDay with this field set to the minimum value
         * for this field.
         * <p>
         * The TimeOfDay attached to this property is unchanged by this call.
         *
         * @return a copy of the TimeOfDay with this field set to its minimum
         * @since 1.2
         */
        public TimeOfDay withMinimumValue() {
            return setCopy(getMinimumValue());
        }
    }

}