/*

* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:

*

*/

package javax.microedition.lcdui;

import java.util.*;

import org.eclipse.swt.graphics.Point;

/**

 * Implementation of LCDUI <code>DateField</code> class.

 */

public class DateField extends Item

{

    /**

     * Input mode that displays only date.

     */

    public static final int DATE = 1;

    /**

     * Input mode which displays only time.

     */

    public static final int TIME = 2;

    /**

     * Input mode which display both date and time.

     */

    public static final int DATE_TIME = 3;

    /**

     * If DateField is changed, reasons for Re-layouting.

     */

	static final int UPDATE_DATE = UPDATE_ITEM_MAX << 1;

	static final int UPDATE_INPUTMODE = UPDATE_ITEM_MAX << 2;

    private Date date;

    private int mode;

    private TimeZone timeZone;

    /**

     * Constructor.

     *

     * @param label Label of DateField.

     * @param mode DateField's input mode.

     * @throws IllegalArgumentException if input mode is not one of the

     *      constants defined in this class.

     */

    public DateField(String label, int mode)

    {

        this(label, mode, null);

    }

    /**

     * Constructor with time zone.

     *

     * @param label Label of DateField.

     * @param mode DateField's input mode.

     * @param timeZone Timezone of DateField or null if default timezone.

     * @throws IllegalArgumentException if input mode is not one of the

     *             constants defined in this class.

     */

    public DateField(String label, int mode, TimeZone timeZone)

    {

        setLabel(label);

        setInputMode(mode);

        this.timeZone = timeZone;

    }

    /**

     * Gets the date set to this DateField.

     *

     * @return Date, or null if date not set.

     */

    public Date getDate()

    {

        if(date == null)

        {

            return null;

        }

        Calendar calendar = Calendar.getInstance();

        calendar.setTime(date);

        if(mode == TIME)

        {

            calendar.set(Calendar.YEAR,Config.DATEFIELD_ZERO_EPOCH_YEAR);

            calendar.set(Calendar.MONTH,Calendar.JANUARY);

            calendar.set(Calendar.DAY_OF_MONTH,1);

        }

        else if(mode == DATE)

        {

            calendar.set(Calendar.HOUR_OF_DAY,0);

            calendar.set(Calendar.MINUTE,0);

            calendar.set(Calendar.SECOND,0);

            calendar.set(Calendar.MILLISECOND,0);

        }

        return calendar.getTime();

    }

    /**

     * Sets the date to this DateField.

     *

     * @param newDate New date. If null, current date is cleared.

     */

    public void setDate(Date newDate)

    {

        internalSetDate(newDate);

        updateParent((newDate == null ? UPDATE_DATE | UPDATE_SIZE_CHANGED : UPDATE_DATE)); 

    }

    /**

     * Gets input mode of this DateField.

     *

     * @return Input mode.

     */

    public int getInputMode()

    {

        return mode;

    }

    /**

     * Sets input mode of this DateField.

     *

     * @param inputMode New input mode. Must be one of constants

     *      defined in this class.

     * @throws IllegalArgumentException if input mode is not one of the

     *      constants defined in this class.

     */

    public void setInputMode(int inputMode)

    {

        if((inputMode != DATE)

                && (inputMode != TIME)

                && (inputMode != DATE_TIME))

        {

            throw new IllegalArgumentException(

                MsgRepository.DATEFIELD_EXCEPTION_INVALID_MODE);

        }

		if(getInputMode() != inputMode)

		{

	        mode = inputMode;

	        updateParent(UPDATE_INPUTMODE | UPDATE_SIZE_CHANGED);

		}

    }

    /**

     * Calculates minimum size of this item.

     *

     * @return Minimum size.

     */

    Point calculateMinimumSize()

    {

        return DateFieldLayouter.calculateMinimumBounds(this);

    }

    /**

     * Calculates preferred size of this item.

     *

     * @return Preferred size.

     */

    Point calculatePreferredSize()

    {

        return DateFieldLayouter.calculatePreferredBounds(this);

    }

    /**

     * Gets timezone.

     *

     * @return Timezone or null if no timezone set.

     */

    TimeZone getTimeZone()

    {

        return timeZone;

    }

    /**

     * Set the new date internally.

     *

     * @param newDate new date

     */

    void internalSetDate(Date newDate)

    {

        if(newDate == null)

        {

            date = null;

        }

        else

        {

            Calendar calendar = Calendar.getInstance();

            if(timeZone != null)

            {

                calendar.setTimeZone(timeZone);

            }

            calendar.setTime(newDate);

            switch(mode)

            {

            case TIME:

                if((calendar.get(Calendar.YEAR) != Config.DATEFIELD_ZERO_EPOCH_YEAR)

                        || (calendar.get(Calendar.MONTH) != Calendar.JANUARY)

                        || (calendar.get(Calendar.DAY_OF_MONTH) != 1))

                {

                    date = null;

                }

                else

                {

                    calendar.set(Calendar.SECOND,0);

	                calendar.set(Calendar.MILLISECOND,0);

                    date = calendar.getTime();

                }

                break;

            case DATE:

                calendar.set(Calendar.HOUR_OF_DAY, 0);

                calendar.set(Calendar.MINUTE, 0);

                calendar.set(Calendar.SECOND,0);

                calendar.set(Calendar.MILLISECOND,0);

                date = calendar.getTime();

                break;

            case DATE_TIME:

                calendar.set(Calendar.SECOND,0);

                calendar.set(Calendar.MILLISECOND,0);

                date = calendar.getTime();

                break;

            default:

                break;

            }

        }

    }

    /**

     * Return layout with optional custom flags.

     *

     * @return layout directive.

     */

    int internalGetLayout()

    {

        return super.internalGetLayout() | Item.LAYOUT_NEWLINE_BEFORE;

    }

    /* (non-Javadoc)

     * @see javax.microedition.lcdui.Item#isFocusable()

     */

    boolean isFocusable()

    {

        return true;

    }

}