using System;
using System.Collections.Generic;
/*
 * This file is part of the iText project.
 * Copyright (c) 1998-2012 1T3XT BVBA
 * Authors: Bruno Lowagie, Paulo Soares, et al.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License version 3
 * as published by the Free Software Foundation with the addition of the
 * following permission added to Section 15 as permitted in Section 7(a):
 * FOR ANY PART OF THE COVERED WORK IN WHICH THE COPYRIGHT IS OWNED BY 1T3XT,
 * 1T3XT DISCLAIMS THE WARRANTY OF NON INFRINGEMENT OF THIRD PARTY RIGHTS.
 *
 * This program 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 Affero General Public License for more details.
 * You should have received a copy of the GNU Affero General Public License
 * along with this program; if not, see http://www.gnu.org/licenses or write to
 * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
 * Boston, MA, 02110-1301 USA, or download the license from the following URL:
 * http://itextpdf.com/terms-of-use/
 *
 * The interactive user interfaces in modified source and object code versions
 * of this program must display Appropriate Legal Notices, as required under
 * Section 5 of the GNU Affero General Public License.
 *
 * In accordance with Section 7(b) of the GNU Affero General Public License,
 * you must retain the producer line in every PDF that is created or manipulated
 * using iText.
 *
 * You can be released from the requirements of the license by purchasing
 * a commercial license. Buying such a license is mandatory as soon as you
 * develop commercial activities involving the iText software without
 * disclosing the source code of your own applications.
 * These activities include: offering paid services to customers as an ASP,
 * serving PDFs on the fly in a web application, shipping iText with a closed
 * source product.
 *
 * For more information, please contact iText Software Corp. at this
 * address: sales@itextpdf.com
 */

namespace iTextSharp.text.html.simpleparser {

    public class ChainedProperties {
    
        /**
         * Class that stores the info about one tag in the chain.
         */
        public sealed class TagAttributes {
            /** A possible tag */
            internal String tag;
            /** The styles corresponding with the tag */
            internal IDictionary<String, String> attrs;
            /**
             * Constructs a chained property.
             * @param   tag     an XML/HTML tag
             * @param   attrs   the tag's attributes
             */
            internal TagAttributes(String tag, IDictionary<String, String> attrs) {
                this.tag = tag;
                this.attrs = attrs;
            }
        }

    	/** A list of chained properties representing the tag hierarchy. */
        public IList<TagAttributes> chain = new List<TagAttributes>();
        
        /** Creates a new instance of ChainedProperties */
        public ChainedProperties() {
        }
        
	    /**
	     * Walks through the hierarchy (bottom-up) looking for
	     * a property key. Returns a value as soon as a match
	     * is found or null if the key can't be found.
	     * @param	key	the key of the property
	     * @return	the value of the property
	     */
        public String this[String key] {
            get {
                for (int k = chain.Count - 1; k >= 0; --k) {
                    TagAttributes p = chain[k];
                    IDictionary<String, String> attrs = p.attrs;
                    if (attrs.ContainsKey(key))
                        return attrs[key];
                }
                return null;
            }
        }
        
	    /**
	     * Walks through the hierarchy (bottom-up) looking for
	     * a property key. Returns true as soon as a match is
	     * found or false if the key can't be found.
	     * @param	key	the key of the property
	     * @return	true if the key is found
	     */
        public bool HasProperty(String key) {
            for (int k = chain.Count - 1; k >= 0; --k) {
                TagAttributes p = chain[k];
                IDictionary<String, String> attrs = p.attrs;
                if (attrs.ContainsKey(key))
                    return true;
            }
            return false;
        }
        
	    /**
	     * Adds a tag and its corresponding properties to the chain.
	     * @param tag	the tags that needs to be added to the chain
	     * @param props	the tag's attributes
	     */
	    public void AddToChain(String tag, IDictionary<String, String> props) {
		    AdjustFontSize(props);
		    chain.Add(new TagAttributes(tag, props));
        }
        
        public void RemoveChain(String tag) {
            for (int k = chain.Count - 1; k >= 0; --k) {
                if (tag.Equals(chain[k].tag)) {
                    chain.RemoveAt(k);
                    return;
                }
            }
        }

        /**
         * If the properties contain a font size, the size may need to
         * be adjusted based on font sizes higher in the hierarchy.
         * @param   attrs the attributes that may have to be updated
         * @since 5.0.6 (renamed)
         */
        protected internal void AdjustFontSize(IDictionary<String, String> attrs) {
            // fetch the font size
            String value;
            attrs.TryGetValue(HtmlTags.SIZE, out value);
            // do nothing if the font size isn't defined
            if (value == null)
                return;
            // the font is defined as a real size: remove "pt"
            if (value.EndsWith("pt")) {
                attrs[HtmlTags.SIZE] = value.Substring(0, value.Length - 2);
                return;
            }
            String old = this[HtmlTags.SIZE];
            attrs[HtmlTags.SIZE] = HtmlUtilities.GetIndexedFontSize(value, old).ToString();
        }
    }
}
