/*
    * Copyright 2004-2006 the Seasar Foundation and the Others.
    *
    * 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.seasar.tuigwaa.cms.core.wiki.base;
  
  import java.net.MalformedURLException;
  import java.net.URL;
  import java.util.ArrayList;
  import java.util.List;
  import java.util.regex.Matcher;
  import java.util.regex.Pattern;
  
  import javax.imageio.ImageIO;
  
  import org.seasar.tuigwaa.cms.core.CmsConstants;
  
  import com.isenshi.util.PathUtils;
  
  /***
   * @author someda
   * 
   * WikiHelper class This provides utility method for wiki parser and other wiki
   * related object. Basically, it does not provide node related tasks for
   * WikiParser but provide only static method which is useful during parsing
   * phase. Also this might be useful for plugin execution phase.
   */
  public class WikiHelper {
  
  	public static final int LIST_TYPE_NORMAL = 1;
  
  	public static final int LIST_TYPE_NUMERICAL = 2;
  
  	public static final int TABLE_TYPE_HEADER = 1;
  
  	public static final int TABLE_TYPE_FOOTER = 2;
  
  	public static final String ANCHOR_MARK = "#";
  
  	public static final String LINK_DELIMITER = ":";
  
  	public static final String ALIAS_DELIMITER = ">";
  
  	private static final Pattern NEWLINE = Pattern.compile("\n");
  
  	private static final Pattern ANCHOR = Pattern
  			.compile(".*//[#[a-zA-Z][0-9a-zA-Z]+//]$");
  
  	private static final Pattern CR = Pattern.compile("\r");
  
  	public static final String ANCHOR_PREFIX = "[#tg";
  
  	public static final String ANCHOR_SUFFIX = "]";
  
  	// private static final String[] IMAGE_SUFFIX =
  	// {".jpg",".jpeg",".gif",".bmp",".png"};
  	private static final String[] IMAGE_SUFFIX = ImageIO.getReaderFormatNames();
  
  	// private static final String ARGS_DELIMITER = ",";
  
  	
  	
  	private static final String VTL_ARGS = "(//([//////$//w//s//[//],;//&]+//))?";
  	
  	private static final Pattern VTL_CMD = Pattern
  			.compile("(<br ///>#|^#|\n#|\r#)([a-z]*" + VTL_ARGS + ")($|<br ///>?)");
  
  	public static boolean isEmail(String image) {
  		return (image.indexOf("@") != -1);
  	}
  
  	public static int getListType(String image) {
  		int type = 0;
  		if (image.equals("-") || image.equals("--") || image.equals("---")) {
  			type = LIST_TYPE_NORMAL;
  		} else if (image.equals("+") || image.equals("++")
  				|| image.equals("+++")) {
  			type = LIST_TYPE_NUMERICAL;
  		}
  		return type;
  	}
  
  	public static String[] split(String image, String delimiter) {
  		String[] s = new String[2];
  		int idx = image.indexOf(delimiter);
  		if (idx != -1) {
  			s[0] = image.substring(0, idx);
  			s[1] = image.substring(idx + 1, image.length());
 		} else {
 			s[0] = image;
 			s[1] = "";
 		}
 		return s;
 	}
 
 	public static String deleteParenthesis(String image, String left,
 			String right) {
 		return deleteParenthesis(image, left, right, true);
 	}
 
 	public static String deleteParenthesis(String image, String left,
 			String right, boolean isWide) {
 		int idx = 0;
 		int lidx = 0;
 		int ridx = image.length();
 
 		if ((idx = image.indexOf(left)) != -1) {
 			lidx = idx + 1;
 		}
 
 		if (isWide) {
 			if ((idx = image.lastIndexOf(right)) != -1) {
 				ridx = idx;
 			}
 		} else {
 			if ((idx = image.indexOf(right)) != -1) {
 				ridx = idx;
 			}
 		}
 		return (ridx > lidx) ? image.substring(lidx, ridx) : "";
 	}
 
 	public static String beforeSavePage(String contentType, String content) {
 		if (CmsConstants.CONTENTTYPE_XWIKI.equals(contentType)) {
 			return setAnchorToHeading(content);
 		} else if (CmsConstants.CONTENTTYPE_HTML.equals(contentType)) {
 			return removeCarriageReturn(content);
 		} else if(CmsConstants.CONTENTTYPE_DFORM.equals(contentType)){
 			//return toVTL(content);
 			return toJSP(content);
 		}
 		return content;
 	}
 
 	/***
 	 * generate anchor data from object hashcode
 	 * 
 	 * @param contents
 	 *            wiki contents
 	 * @return contents with anchor data
 	 */
 	public static String setAnchorToHeading(String contents) {
 		String mod = removeCarriageReturn(contents);
 		String[] s = NEWLINE.split(mod);
 
 		StringBuffer buf = new StringBuffer();
 		int hashcode = contents.hashCode();
 		for (int i = 0; i < s.length; i++) {
 			buf.append(s[i]);
 
 			Matcher m = ANCHOR.matcher(s[i]);
 			if (s[i].indexOf("*") == 0 && !m.matches()) {
 				buf.append(ANCHOR_PREFIX + Integer.toHexString(hashcode)
 						+ ANCHOR_SUFFIX);
 				hashcode++;
 			}
 			buf.append(CmsConstants.LINEBREAK_CODE);
 		}
 		return buf.toString();
 	}
 
 	/***
 	 * remove carriage return
 	 * 
 	 * @param contents
 	 *            html contents
 	 */
 	public static String removeCarriageReturn(String contents) {
 		Matcher crm = CR.matcher(contents);
 		return crm.replaceAll("");
 	}
 
 	/***
 	 * Discriminates the specifid string represents image file or not. This see
 	 * the string as image if it ends with <strong>.jpg,.jpeg,.gif,.png,and .bmp</strong>
 	 * in a case insensitive mannger.
 	 */
 	public static boolean isImage(String s) {
 
 		boolean flag = false;
 		String extension = PathUtils.getExtension(s);
 
 		if (extension != null && !extension.equals("")) {
 			for (int i = 0; i < IMAGE_SUFFIX.length; i++) {
 				if (extension.equalsIgnoreCase(IMAGE_SUFFIX[i])) {
 					flag = true;
 					break;
 				}
 			}
 		}
 		return flag;
 	}
 
 	private static final String JSP_HEADER = "<%@ page contentType=\"text/html; charset=Windows-31J\" %>\n" +  
 	"<%@ taglib uri=\"/WEB-INF/tgw-c.tld\" prefix=\"tgwc\" %>\n";
 
 	public static String toJSP(String str) {
 		return JSP_HEADER + str;
 	}
 
 	public static String toVTL(String str) {
 		str = str.replaceAll("//$", "//////$");
 		Matcher matcher = VTL_CMD.matcher(str);
 		StringBuffer buf = new StringBuffer();
 		while (matcher.find()) {
 			String vtlcmd = matcher.group(2);
 			vtlcmd = vtlcmd.replaceAll("//&quot;", "\"");
 			matcher.appendReplacement(buf, "\n#" + vtlcmd + "\n");
 		}
 		matcher.appendTail(buf);
 		str = buf.toString();
 		str = str.replaceAll("//////$", "//$");
 		return str;
 	}
 
 
 	/***
 	 * Discriminates the specifid string represents URL or not.
 	 */
 	public static boolean isURL(String s) {
 
 		try {
 			new URL(s);
 			return true;
 		} catch (MalformedURLException e) {
 			// do nothing
 		}
 		return false;
 	}
 
 	public static String[] splitArgs(String image) {
 		String s = deleteParenthesis(image, "(", ")");
 
 		StringBuffer buf = new StringBuffer();
 		List argsList = new ArrayList();
 		int cnt = 0;
 		int parenthesis = 0;
 		for (int i = 0; i < s.length(); i++) {
 			char c = s.charAt(i);
 			if (c == '&') { // enter plugin mode
 				cnt++;
 			}
 
 			if (cnt > 0 && (c == '(' || c == '{')) { // enter parenthesis
 				// mode
 				parenthesis++;
 			}
 
 			if (cnt > 0 && (c == ')' || c == '}')) {
 				parenthesis--;
 			}
 
 			// if(c == ';'){
 			// cnt--;
 			// }
 
 			if (c == ',') {
 				if ((cnt > 0 && parenthesis == 0) || cnt == 0) {
 					argsList.add(buf.toString().trim());
 					buf = new StringBuffer();
 					cnt = 0;
 					continue;
 				}
 			}
 			buf.append(c);
 		}
 
 		if (buf.length() > 0) {
 			argsList.add(buf.toString().trim());
 		}
 		return (String[]) argsList.toArray(new String[argsList.size()]);
 	}
 
 	public static int getTableType(String image) {
 		int type = 0;
 		if ("h".equals(image) || "H".equals(image)) {
 			type = TABLE_TYPE_HEADER;
 		} else if ("f".equals(image) || "F".equals(image)) {
 			type = TABLE_TYPE_FOOTER;
 		}
 		return type;
 	}
 
 }