/*
 * File    : Html.java
 * Created : 05-dec-2001 12:28
 * By      : fbusquets
 *
 * JClic - Authoring and playing system for educational activities
 *
 * Copyright (C) 2000 - 2005 Francesc Busquets & Departament
 * d'Educacio de la Generalitat de Catalunya
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * 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 General Public License for more details (see the LICENSE file).
 */

package edu.xtec.util;

/**
 *
 * @author Francesc Busquets (fbusquets@xtec.net)
 * @version 1.0
 */

import java.util.StringTokenizer;
import java.io.PrintStream;

public class Html extends Object {
    
    public static final String SP=" ";
    public static final String NBSP=" ";
    public static final String BR="\n<BR>\n";
    public static final String P="\n<P>\n";
    public static final String Q="\"";
    public static final int LEFT=0, CENTER=1, RIGHT=2;
    public static final String[] ALIGN={"", "ALIGN=\"center\"", "ALIGN=\"right\""};
    
    protected StringBuffer sb;
    
    public Html(int bufSize){
        sb=new StringBuffer(bufSize);
    }
    
    public Html(StringBuffer sb){
        this.sb=sb;
    }
    
    public String toString(){
        return sb.substring(0);
    }
    
    public Html append(String str){
        sb.append(str==null ? "" : str);
        return this;
    }
    
    public Html appendParagraphs(String source){
        StringTokenizer st=new StringTokenizer(source, "\n");
        boolean first=true;
        while(st.hasMoreTokens()){
            if(!first)
                sb.append(BR);
            else
                first=false;
            sb.append(st.nextToken());
        }
        return this;
    }
    
    public Html mailTo(String mail, boolean parenthesis){
        if(parenthesis)
            sb.append("(");
        sb.append("<A HREF=\"mailto:").append(mail).append("\">").append(mail).append("</A>");
        if(parenthesis)
            sb.append(")");
        return this;
    }
    
    public Html linkTo(String url, String text){
        sb.append("<A HREF=\"").append(url).append("\">");
        sb.append(text==null ? url : text);
        sb.append("</A>");
        return this;
    }
    
    public Html bold(String text){
        sb.append("<B>").append(text).append("</B>");
        return this;
    }
    
    public Html td(boolean init){
        sb.append(init ? "<TD VALIGN=\"top\">" : "</TD>\n");
        return this;
    }
    
    public Html td(String text){
        return td(text, false);
    }
    
    public Html td(String text, int align, boolean bold, String tdParams){
        sb.append("<TD VALIGN=\"top\" ");
        if(align>LEFT)
            sb.append(SP).append(ALIGN[align]);
        if(tdParams!=null)
            sb.append(SP).append(tdParams);
        sb.append(">");
        if(bold)
            bold(text);
        else
            sb.append(text);
        sb.append("</TD>\n");
        return this;
    }
    
    public Html td(String text, boolean bld){
        sb.append("<TD VALIGN=\"top\">");
        if(bld)
            bold(text);
        else
            sb.append(text);
        sb.append("</TD>\n");
        return this;
    }
    
    public Html tr(boolean init){
        return append(init ? "<TR>" : "</TR>\n");
    }
    
    public Html br(){
        return append(BR);
    }
    
    public Html p(){
        return append(P);
    }
    
    public Html sp(){
        return append(SP);
    }
    
    public Html nbsp(){
        return append(NBSP);
    }
    
    public Html doubleCell(String tx1, boolean b1, String tx2, boolean b2){
        tr(true);
        td(true);
        if(b1)
            sb.append("<B>");
        appendParagraphs(tx1);
        if(b1)
            sb.append("</B>");
        td(false);
        td(true);
        if(b2)
            sb.append("<B>");
        appendParagraphs(tx2);
        if(b2)
            sb.append("</B>");
        td(false);
        tr(false);
        return this;
    }
    
    public static String table(String content, String width, int border, int cellPadding, int cellSpacing, String style, boolean simpleCell){
        int v=content!=null ? content.length() : 100;
        StringBuffer sbs=new StringBuffer(v+200);
        sbs.append("<TABLE ");
        if(width!=null)
            sbs.append(" WIDTH=\"").append(width).append(Q);
        if(border>=0)
            sbs.append(" BORDER=\"").append(border).append(Q);
        if(cellPadding>=0)
            sbs.append(" CELLPADDING=\"").append(cellPadding).append(Q);
        if(cellSpacing>=0)
            sbs.append(" CELLSPACING=\"").append(cellSpacing).append(Q);
        if(style!=null)
            sbs.append(" STYLE=\"").append(style).append(Q);
        sbs.append(">\n");
        if(simpleCell)
            sbs.append("<TR><TD>");
        sbs.append(content);
        if(simpleCell)
            sbs.append("</TD></TR>");
        sbs.append("\n</TABLE>");
        return sbs.substring(0);
    }
    
    public static String getHtmlDoc(String content, String bgColor){
        int v=content!=null ? content.length() : 100;
        StringBuffer sbs=new StringBuffer(v+100);
        sbs.append("<HTML>\n");
        sbs.append("<BODY");
        if(bgColor!=null)
            sbs.append(" BGCOLOR=\"#").append(bgColor).append(Q);
        sbs.append(">\n");
        sbs.append(content);
        sbs.append("</BODY></HTML>");
        return sbs.substring(0);
    }
    
    public static String quote(String txt){
        StringBuffer sbs=new StringBuffer(txt.length()*3);        
        sbs.append("'");        
        sbs.append(edu.xtec.util.StrUtils.replace(edu.xtec.util.StrUtils.replace(edu.xtec.util.StrUtils.replace(txt, "'", "&#39;"),"\"", "&quot;"), "`","&rsquo;"));
        //edu.xtec.jclic.misc.Utils.replace(txt, "'", "\\'"),
        //"\"", "\\\""));
        //edu.xtec.jclic.misc.Utils.replace(txt, "'", "&rsquo;"),
        //"\"", "&quot;"));
        sbs.append("'");
        return sbs.substring(0);        
    }
    
    public static final String validChars=" -_.*0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";
    
    public static String encode(String src){        
        if(src==null || src.length()<1)
            return src;
        
        int len=src.length();
        StringBuffer sbs=new StringBuffer(len*2);
        for(int i=0; i<len; i++){            
            char ch=src.charAt(i);
            if(validChars.indexOf(ch)>=0)
                sbs.append(ch);
            else if(ch<256)
                sbs.append("%").append(Integer.toHexString(ch));
            else
                sbs.append("%26%23").append(Integer.toHexString(ch)).append("%3B");
        }
        return sbs.substring(0);
    }
    
    public static String decode(String src){
        if(src==null || src.length()<1)
            return src;
        int len=src.length();
        StringBuffer sbs=new StringBuffer(len);
        for(int i=0; i<len; i++){
            char ch=src.charAt(i);
            if(ch=='%'){
                sbs.append((char)Integer.parseInt(src.substring(i+1, i+3), 16));
                i+=2;
            }
            else
                sbs.append(ch);
            
        }
        String s=sbs.substring(0);
        len=s.length();
        sbs.setLength(0);
        int j=0;
        for(int i=0; i<len; i++){
            char ch=s.charAt(i);
            if(ch=='&' && (j=s.indexOf(';', i))>i+2){
                String v=s.substring(i+1, j).toLowerCase();
                if(v.length()>2 && v.charAt(0)=='#'){
                    int k=0;
                    if(v.charAt(1)=='x')
                        k=Integer.parseInt(v.substring(2), 16);
                    else
                        k=Integer.parseInt(v.substring(1));
                    sbs.append((char)k);
                }
                else
                    sbs.append('?');
                i=j;
            }
            else
                sbs.append(ch);
        }
        return sbs.substring(0);
    }
    
    // to deprecate!!
    public static void processParamsLine(String txt, java.util.HashMap map, char sep, char equalSign){
        if(txt!=null && txt.length()>0 && map!=null){
            StringTokenizer st=new StringTokenizer(txt, String.valueOf(sep));
            while(st.hasMoreTokens()){
                String s=st.nextToken().trim();
                String key=null, value=null;
                int k=s.indexOf(equalSign);
                if(k>0){
                    key=decode(s.substring(0, k).replace('+', ' '));
                    if(k<s.length()-1)
                        value=decode(s.substring(k+1).replace('+', ' '));
                }
                else
                    key=decode(s.replace('+', ' '));
                map.put(key, value);
            }
        }
    }
    
    public static void writeScriptConfirm(PrintStream pOut){
        pOut.println("<SCRIPT language=\"javascript\">");
        pOut.println("function confirmAction(msg){");
        pOut.println("   var agree=confirm(msg);");
        pOut.println("   if (agree)");
        pOut.println("     return true;");
        pOut.println("   else");
        pOut.println("     return false;");
        pOut.println("}");
        pOut.println("</SCRIPT>");
    }
    
    
}