/*
 * Copyright 2003 by Paulo Soares.
 *
 * The contents of this file are subject to the Mozilla Public License Version 1.1
 * (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.mozilla.org/MPL/
 *
 * Software distributed under the License is distributed on an "AS IS" basis,
 * WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
 * for the specific language governing rights and limitations under the License.
 *
 * The Original Code is 'iText, a free JAVA-PDF library'.
 *
 * The Initial Developer of the Original Code is Bruno Lowagie. Portions created by
 * the Initial Developer are Copyright (C) 1999, 2000, 2001, 2002 by Bruno Lowagie.
 * All Rights Reserved.
 * Co-Developer of the code is Paulo Soares. Portions created by the Co-Developer
 * are Copyright (C) 2000, 2001, 2002 by Paulo Soares. All Rights Reserved.
 *
 * Contributor(s): all the names of the contributors are added in the source code
 * where applicable.
 *
 * Alternatively, the contents of this file may be used under the terms of the
 * LGPL license (the "GNU LIBRARY GENERAL PUBLIC LICENSE"), in which case the
 * provisions of LGPL are applicable instead of those above.  If you wish to
 * allow use of your version of this file only under the terms of the LGPL
 * License and not to allow others to use your version of this file under
 * the MPL, indicate your decision by deleting the provisions above and
 * replace them with the notice and other provisions required by the LGPL.
 * If you do not delete the provisions above, a recipient may use your version
 * of this file under either the MPL or the GNU LIBRARY GENERAL PUBLIC LICENSE.
 *
 * This library is free software; you can redistribute it and/or modify it
 * under the terms of the MPL as stated above or under the terms of the GNU
 * Library General Public License as published by the Free Software Foundation;
 * either version 2 of the License, or 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 Library general Public License for more
 * details.
 *
 * If you didn't download this code from the following link, you should check if
 * you aren't using an obsolete version:
 * http://www.lowagie.com/iText/
 */
package com.lowagie.text.pdf;

import com.lowagie.text.Chunk;
import com.lowagie.text.Font;
import com.lowagie.text.Phrase;
import com.lowagie.text.Utilities;

import java.util.ArrayList;

/**
 * Selects the appropriate fonts that contain the glyphs needed to render text correctly. The fonts
 * are checked in order until the character is found.
 * <p>
 * The built in fonts "Symbol" and "ZapfDingbats", if used, have a special encoding to allow the
 * characters to be referred by Unicode.
 * 
 * @author Paulo Soares ([email protected])
 */
@SuppressWarnings("unchecked")
public class FontSelector {

	protected ArrayList fonts = new ArrayList();

	/**
	 * Adds a <CODE>Font</CODE> to be searched for valid characters.
	 * 
	 * @param font the <CODE>Font</CODE>
	 */
	public void addFont(Font font) {
		if (font.getBaseFont() != null) {
			fonts.add(font);
			return;
		}
		BaseFont bf = font.getCalculatedBaseFont(true);
		Font f2 = new Font(bf, font.getSize(), font.getCalculatedStyle(), font.getColor());
		fonts.add(f2);
	}

	/**
	 * Process the text so that it will render with a combination of fonts if needed.
	 * 
	 * @param text the text
	 * @return a <CODE>Phrase</CODE> with one or more chunks
	 */
	public Phrase process(String text) {
		int fsize = fonts.size();
		if (fsize == 0) {
			throw new IndexOutOfBoundsException("No font is defined.");
		}
		char cc[] = text.toCharArray();
		int len = cc.length;
		StringBuffer sb = new StringBuffer();
		Font font = null;
		int lastidx = -1;
		Phrase ret = new Phrase();
		for (int k = 0; k < len; ++k) {
			char c = cc[k];
			if (c == '\n' || c == '\r') {
				sb.append(c);
				continue;
			}
			if (Utilities.isSurrogatePair(cc, k)) {
				int u = Utilities.convertToUtf32(cc, k);
				for (int f = 0; f < fsize; ++f) {
					font = (Font) fonts.get(f);
					if (font.getBaseFont().charExists(u)) {
						if (lastidx != f) {
							if (sb.length() > 0 && lastidx != -1) {
								Chunk ck = new Chunk(sb.toString(), (Font) fonts.get(lastidx));
								ret.add(ck);
								sb.setLength(0);
							}
							lastidx = f;
						}
						sb.append(c);
						sb.append(cc[++k]);
						break;
					}
				}
			} else {
				for (int f = 0; f < fsize; ++f) {
					font = (Font) fonts.get(f);
					if (font.getBaseFont().charExists(c)) {
						if (lastidx != f) {
							if (sb.length() > 0 && lastidx != -1) {
								Chunk ck = new Chunk(sb.toString(), (Font) fonts.get(lastidx));
								ret.add(ck);
								sb.setLength(0);
							}
							lastidx = f;
						}
						sb.append(c);
						break;
					}
				}
			}
		}
		if (sb.length() > 0) {
			Chunk ck = new Chunk(sb.toString(), (Font) fonts.get(lastidx == -1 ? 0 : lastidx));
			ret.add(ck);
		}
		return ret;
	}
}