/*
   Licensed to Plutext Pty Ltd under one or more contributor license agreements.  
   
 *  This file is part of docx4j.

    docx4j is 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.docx4j.model.properties.table;

import java.math.BigInteger;

import org.docx4j.UnitsOfMeasurement;
import org.docx4j.jaxb.Context;
import org.docx4j.wml.TblPr;
import org.docx4j.wml.TblWidth;
import org.docx4j.wml.TcPrInner;
import org.w3c.dom.Element;
import org.w3c.dom.css.CSSPrimitiveValue;
import org.w3c.dom.css.CSSValue;

/*
 *  @author Alberto Zerolo
 *  @since 3.0.0
 */
public abstract class AbstractCellMargin extends AbstractTableProperty {
	
	protected static final String CSS_NAME_PREFIX = "padding-";  
	protected static final String FO_NAME_PREFIX = CSS_NAME_PREFIX;  

	protected String cssAttributeName = null; 
	protected String foAttributeName = null; 

	int MAGIC_NUMBER = 240;
	
	protected AbstractCellMargin(TblWidth val, String suffix) {
		init(suffix);
		this.setObject(val);
	}
	
	public AbstractCellMargin(CSSValue value, String suffix) {	
		CSSPrimitiveValue cssPrimitiveValue = (CSSPrimitiveValue)value;
		TblWidth tblWidth = Context.getWmlObjectFactory().createTblWidth();
		short ignored = 1;
		float fVal = cssPrimitiveValue.getFloatValue(ignored); // unit type ignored in cssparser

		int twip;
		
		short type = cssPrimitiveValue.getPrimitiveType();
		if (CSSPrimitiveValue.CSS_IN == type) {
			twip = UnitsOfMeasurement.inchToTwip(fVal);
		} else if (CSSPrimitiveValue.CSS_MM == type) {
			twip = UnitsOfMeasurement.mmToTwip(fVal);		
		} else if (CSSPrimitiveValue.CSS_PERCENTAGE == type) {
			twip = twipFromPercentage(fVal);		
		} else {
			log.error("No support for unit " + type);
			twip = 0;
		}
		init(suffix);
		tblWidth.setW(BigInteger.valueOf(twip));
		tblWidth.setType(TblWidth.TYPE_DXA);
		this.setObject(tblWidth);
	}
	
	protected int twipFromPercentage(float fVal) {		
		return Math.round(MAGIC_NUMBER*fVal/100);		
	}
	
	protected void init(String suffix) {
		cssAttributeName = CSS_NAME_PREFIX + suffix;
		foAttributeName = FO_NAME_PREFIX + suffix;
	}

	@Override
	public String getCssProperty() {
	int twips = getTwips();
	String ret = null;
		if (twips > -1) {
			ret = composeCss(cssAttributeName, formatTwips(twips));
		}
		return ret;
	}

	@Override
	public String getCssName() {
		return cssAttributeName;
	}

	@Override
	public void setXslFO(Element foElement) {
	int twips = getTwips();
		if (twips > -1) {
			foElement.setAttribute(foAttributeName, formatTwips(twips));				
		}
	}

	protected int getTwips() {
	TblWidth width = (TblWidth)getObject();
	int ret = -1;
		if ((width != null) && (width.getW() != null)) {
			ret = width.getW().intValue();
		}
		return ret;
	}

	protected String formatTwips(int twips) {		
		return UnitsOfMeasurement.format2DP.format(UnitsOfMeasurement.twipToMm(twips)) + "mm";
	}

	protected void ensureMargin(TcPrInner tcPr) {
		if (tcPr.getTcMar() == null) {
			tcPr.setTcMar(Context.getWmlObjectFactory().createTcMar());
		}
	}

	public void ensureMargin(TblPr tblPr) {
		if (tblPr.getTblCellMar() == null) {
			tblPr.setTblCellMar(Context.getWmlObjectFactory().createCTTblCellMar());
		}
	}
	
	public abstract void set(TcPrInner tcPr);
	
}