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/*
 *  MicroEmulator
 *  Copyright (C) 2001-2005 Bartek Teodorczyk 
 *  Copyright (C) 2005 Andres Navarro
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

package javax.microedition.lcdui;

import java.util.Hashtable;

import org.microemu.device.DeviceFactory;


public final class Font 
{
	public static final int STYLE_PLAIN = 0;
	public static final int STYLE_BOLD = 1;
	public static final int STYLE_ITALIC = 2;
	public static final int STYLE_UNDERLINED = 4;
	
	public static final int SIZE_SMALL = 8;
	public static final int SIZE_MEDIUM = 0;
	public static final int SIZE_LARGE = 16;
	
	public static final int FACE_SYSTEM = 0;
	public static final int FACE_MONOSPACE = 32;
	public static final int FACE_PROPORTIONAL = 64;

	public static final int FONT_STATIC_TEXT = 0;
	public static final int FONT_INPUT_TEXT = 1;
	
	private static final Font DEFAULT_FONT = new Font(Font.FACE_SYSTEM, Font.STYLE_PLAIN, Font.SIZE_MEDIUM);
	
	private static Font []fontsBySpecifier = {DEFAULT_FONT, DEFAULT_FONT};
	
	private static Hashtable fonts = new Hashtable();
	
	private int face;
	
	private int style;
	
	private int size;
	
	private int baselinePosition = -1;
	
	private int height = -1;
	

	private Font(int face, int style, int size)
	{
		if ((face != FACE_SYSTEM) && (face != FACE_MONOSPACE) && (face != FACE_PROPORTIONAL)) {
			throw new IllegalArgumentException();
		}
		if (!(isPlain() || isBold() || isItalic() || isUnderlined())) {
			throw new IllegalArgumentException();
		}
		if ((size != SIZE_SMALL) && (size != SIZE_MEDIUM) && (size != SIZE_LARGE)) {
			throw new IllegalArgumentException();
		}
		
		this.face = face;
		this.style = style;
		this.size = size;
	}


	public static Font getDefaultFont()
	{
		return DEFAULT_FONT;
	}
	
	
	public static Font getFont(int specifier) {
		if (specifier != Font.FONT_INPUT_TEXT &&
					specifier != Font.FONT_STATIC_TEXT)
			throw new IllegalArgumentException("Bad specifier");
		return fontsBySpecifier[specifier];
	}

	
	public static Font getFont(int face, int style, int size)
	{
		Integer key = new Integer(style + size + face);
		Font result = (Font) fonts.get(key);
		if (result == null) {
			result = new Font(face, style, size);
			fonts.put(key, result);
		}
		return result;
	}

	
	public int getStyle()
	{
		return style;
	}


	public int getSize()
	{
		return size;
	}

	
	public int getFace()
	{
		return face;
	}


	public boolean isPlain()
	{
		if (style == STYLE_PLAIN) {
			return true;
		} else {
			return false;
		}
	}
	

	public boolean isBold()
	{
		if ((style & STYLE_BOLD) != 0) {
			return true;
		} else {
			return false;
		}
	}


	public boolean isItalic()
	{
		if ((style & STYLE_ITALIC) != 0) {
			return true;
		} else {
			return false;
		}
	}
	
	
	public boolean isUnderlined()
	{
		if ((style & STYLE_UNDERLINED) != 0) {
			return true;
		} else {
			return false;
		}
	}
	
	
	public int getHeight()
	{
		if (height == -1) {
			height = DeviceFactory.getDevice().getFontManager().getHeight(this);
		}
		
		return height;
	}

	
	public int getBaselinePosition()
	{
		if (baselinePosition == -1) { 
			baselinePosition = DeviceFactory.getDevice().getFontManager().getBaselinePosition(this);
		}
		
		return baselinePosition;
	}

	
	public int charWidth(char ch)
	{
		return DeviceFactory.getDevice().getFontManager().charWidth(this, ch);
	}

	
	public int charsWidth(char[] ch, int offset, int length)
	{
		return DeviceFactory.getDevice().getFontManager().charsWidth(this, ch, offset, length);
	}


	public int stringWidth(String str)
	{
		return DeviceFactory.getDevice().getFontManager().stringWidth(this, str);
	}

	
	public int substringWidth(String str, int offset, int len)
	{
		return stringWidth(str.substring(offset, offset + len));
	}


	public int hashCode() {
		return style + size + face;
	}	
	
}