/*******************************************************************************
 * Copyright 2013 Jeremie Bresson
 * 
 * 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 net.apocalypselabs.symat; // Package name changed.

import java.awt.Color;
import java.util.List;
import java.util.Map.Entry;
import syntaxhighlight.ParseResult;
import syntaxhighlight.Style;
import syntaxhighlight.Theme;

public class PrettifyToHtml {
	private static final String MAIN_CLASS = "prettyprint";

	/**
	 * Format the {@link ParseResult} into an HTML file.
	 * @param content
	 * @param parseResults
	 * @return
	 */
	public static String toHtml(String content, List<ParseResult> parseResults) {
		int endIndex = 0;
		StringBuilder sb = new StringBuilder();
		sb.append("<div class=\"" + MAIN_CLASS + "\">");
		sb.append("<pre>");
		for (ParseResult pr : parseResults) {
			int startIndex = pr.getOffset();
			if(startIndex > endIndex) {
				sb.append(content.substring(endIndex, startIndex));
			}
			endIndex = startIndex + pr.getLength();
			sb.append("<span class=\""+pr.getStyleKeysString()+"\">");
			sb.append(content.substring(startIndex, endIndex));
			sb.append("</span>");
		}
		if(content.length() > endIndex) {
			sb.append(content.substring(endIndex, content.length()));				
		}
		sb.append("</pre>");
		sb.append("</div>");
		return sb.toString();
	}

	public static String toCss(Theme theme) {
		StringBuilder sb = new StringBuilder();
		sb.append("." + MAIN_CLASS + "  {");
		sb.append("font-family:monospace; ");
		appendCssColor(sb, "background-color", theme.getBackground());
		sb.append("}\n");
		for (Entry<String, Style> entry : theme.getStyles().entrySet()) {
			sb.append("." + MAIN_CLASS + " ."+entry.getKey()+"  {");
			Style style = entry.getValue();
			appendCssColor(sb, "background-color", style.getBackground());
			appendCssColor(sb, "color", style.getColor());
			appendCssText(sb, "font-weight: bold", style.isBold());
			appendCssText(sb, "font-style: italic", style.isItalic());
			appendCssText(sb, "text-decoration: underline", style.isUnderline());
			sb.append("}\n");
		}
		theme.getStyles();
		return sb.toString();
	}

	private static void appendCssColor(StringBuilder sb, String cssKey, Color color) {
		if(color != null) {
			sb.append(cssKey +": "+ encode(color) + "; ");
		}
	}
	
	private final static String encode(Color color) {
		String s = Integer.toHexString(color.getRGB() & 0xffffff);
		if (s.length() < 6) { 
			s = "000000".substring(0, 6 - s.length()) + s;
		}
		return '#' + s;
	}
	
	private static void appendCssText(StringBuilder sb, String cssProp, boolean isSet) {
		if(isSet) {
			sb.append(cssProp + "; ");
		}
	}
}