/*
    GNU LESSER GENERAL PUBLIC LICENSE
    Copyright (C) 2006 The Lobo Project

    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., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA

    Contact info: lobochief@users.sourceforge.net
*/
/*
 * Created on Nov 19, 2005
 */
package org.lobobrowser.html.style;

public final class HtmlLength {
	// Note: Preferred type has higher value
	public static final int PIXELS = 1;
	public static final int LENGTH = 2;
	public static final int MULTI_LENGTH = 0;
	
	public static final HtmlLength[] EMPTY_ARRAY = new HtmlLength[0];
	
	private final int lengthType;
	private volatile int value;
	
	public HtmlLength(String spec) throws IndexOutOfBoundsException, NumberFormatException {
		spec = spec.trim();
		int length = spec.length();
		char lastChar = spec.charAt(length - 1);
		String parseable;
		if(lastChar == '%') {
			this.lengthType = LENGTH;
			parseable = spec.substring(0, length - 1).trim();
		}
		else if(lastChar == '*') {
			this.lengthType = MULTI_LENGTH;
			if(length <= 1) {
				parseable = "1";
			}
			else {	
				parseable = spec.substring(0, length - 1).trim();
			}
		}
		else {
			this.lengthType = PIXELS;
			parseable = spec;
		}
		this.value = Integer.parseInt(parseable);
	}
	
	public HtmlLength(int pixels) {
		this.lengthType = PIXELS;
		this.value = pixels;
	}
	
	/**
	 * @return Returns the lengthType.
	 */
	public final int getLengthType() {
		return lengthType;
	}

	/**
	 * @return Returns the spec.
	 */
	public final int getRawValue() {
		return this.value;
	}
	
	public final int getLength(int availLength) {
		int lt = this.lengthType;
		if(lt == LENGTH) {
			return (availLength * this.value) / 100;
		}
		else {
			return this.value;
		}
	}
	
	public final void divideBy(int denominator) {
		int val = this.value;
		val = val / denominator;
		this.value = val;
	}
	
	public final boolean isPreferredOver(HtmlLength otherLength) {
		if(otherLength == null) {
			return true;
		}
		if(this.lengthType > otherLength.lengthType) {
			return true;
		}
		return this.value > otherLength.value;
	}
}