/*
* 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;

    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);
			  }
        return calendar.getTime();//date;
    }

    /**
     * Sets the date to this DateField.
     *
     * @param newDate New date. If null, current date is cleared.
     */
    public void setDate(Date newDate) {
        internalSetDate(newDate);
        updateParent(UPDATE_CONTENT);
    }

    /**
     * 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);
        }
        mode = inputMode;
        updateParent(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 {
                        date = calendar.getTime();
                    }
                    break;
                case DATE:
                    calendar.set(Calendar.HOUR_OF_DAY, 0);
                    calendar.set(Calendar.MINUTE, 0);
                    date = calendar.getTime();
                    break;
                case DATE_TIME:
                    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;
    }
}