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/*
 *  Copyright 2001-2005 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.chrono;

import org.joda.time.Chronology;
import org.joda.time.DateTimeField;
import org.joda.time.DateTimeZone;
import org.joda.time.field.StrictDateTimeField;

/**
 * Wraps another Chronology, ensuring all the fields are strict.
 * 
 * StrictChronology is thread-safe and immutable.
 *
 * @author Brian S O'Neill
 * @since 1.0
 * @see StrictDateTimeField
 * @see LenientChronology
 */
public final class StrictChronology extends AssembledChronology {

    /** Serialization lock */
    private static final long serialVersionUID = 6633006628097111960L;

    /**
     * Create a StrictChronology for any chronology.
     *
     * @param base the chronology to wrap
     * @throws IllegalArgumentException if chronology is null
     */
    public static StrictChronology getInstance(Chronology base) {
        if (base == null) {
            throw new IllegalArgumentException("Must supply a chronology");
        }
        return new StrictChronology(base);
    }

    private transient Chronology iWithUTC;

    /**
     * Create a StrictChronology for any chronology.
     *
     * @param base the chronology to wrap
     */
    private StrictChronology(Chronology base) {
        super(base, null);
    }

    public Chronology withUTC() {
        if (iWithUTC == null) {
            if (getZone() == DateTimeZone.UTC) {
                iWithUTC = this;
            } else {
                iWithUTC = StrictChronology.getInstance(getBase().withUTC());
            }
        }
        return iWithUTC;
    }

    public Chronology withZone(DateTimeZone zone) {
        if (zone == null) {
            zone = DateTimeZone.getDefault();
        }
        if (zone == DateTimeZone.UTC) {
            return withUTC();
        }
        if (zone == getZone()) {
            return this;
        }
        return StrictChronology.getInstance(getBase().withZone(zone));
    }

    protected void assemble(Fields fields) {
        fields.year = convertField(fields.year);
        fields.yearOfEra = convertField(fields.yearOfEra);
        fields.yearOfCentury = convertField(fields.yearOfCentury);
        fields.centuryOfEra = convertField(fields.centuryOfEra);
        fields.era = convertField(fields.era);
        fields.dayOfWeek = convertField(fields.dayOfWeek);
        fields.dayOfMonth = convertField(fields.dayOfMonth);
        fields.dayOfYear = convertField(fields.dayOfYear);
        fields.monthOfYear = convertField(fields.monthOfYear);
        fields.weekOfWeekyear = convertField(fields.weekOfWeekyear);
        fields.weekyear = convertField(fields.weekyear);
        fields.weekyearOfCentury = convertField(fields.weekyearOfCentury);

        fields.millisOfSecond = convertField(fields.millisOfSecond);
        fields.millisOfDay = convertField(fields.millisOfDay);
        fields.secondOfMinute = convertField(fields.secondOfMinute);
        fields.secondOfDay = convertField(fields.secondOfDay);
        fields.minuteOfHour = convertField(fields.minuteOfHour);
        fields.minuteOfDay = convertField(fields.minuteOfDay);
        fields.hourOfDay = convertField(fields.hourOfDay);
        fields.hourOfHalfday = convertField(fields.hourOfHalfday);
        fields.clockhourOfDay = convertField(fields.clockhourOfDay);
        fields.clockhourOfHalfday = convertField(fields.clockhourOfHalfday);
        fields.halfdayOfDay = convertField(fields.halfdayOfDay);
    }

    private static final DateTimeField convertField(DateTimeField field) {
        return StrictDateTimeField.getInstance(field);
    }

    //-----------------------------------------------------------------------
    /**
     * A strict chronology is only equal to a strict chronology with the
     * same base chronology.
     * 
     * @param obj  the object to compare to
     * @return true if equal
     * @since 1.4
     */
    public boolean equals(Object obj) {
        if (this == obj) {
            return true;
        }
        if (obj instanceof StrictChronology == false) {
            return false;
        }
        StrictChronology chrono = (StrictChronology) obj;
        return getBase().equals(chrono.getBase());
    }

    /**
     * A suitable hashcode for the chronology.
     * 
     * @return the hashcode
     * @since 1.4
     */
    public int hashCode() {
        return 352831696 + getBase().hashCode() * 7;
    }

    /**
     * A debugging string for the chronology.
     * 
     * @return the debugging string
     */
    public String toString() {
        return "StrictChronology[" + getBase().toString() + ']';
    }

}