/*
 * File    : RequestProcessor.java
 * Created : 23-jan-2003 10:31
 * 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.servlet;

import java.util.Vector;
import java.util.Iterator;
import java.util.StringTokenizer;
import java.util.Date;
import java.text.SimpleDateFormat;
import java.util.Locale;
import java.util.TimeZone;
import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;

/**
 *
 * @author Francesc Busquets (fbusquets@xtec.net)
 */
public abstract class RequestProcessor {
    
    public static final String REDIRECT="REDIRECT", CONTENT_TYPE="CONTENT_TYPE",
    CONTENT_LENGTH="CONTENT_LENGTH", COOKIE="COOKIE", EXTRA="EXTRA", ERROR="ERROR";    
    public static final int HTTP_NOT_FOUND=404, HTTP_BAD_REQUEST=400, HTTP_UNAUTHORIZED=401;
    public static final String CHARSET="ISO-8859-1";
    private java.util.HashMap params;
    private java.util.HashMap cookies;
    private java.util.HashMap headers;
    private InputStream inputStream;
    
    public int errCode;
    public String errMsg;
    private static boolean DIRECT_RESOURCES;
    protected static HashMap properties=new HashMap();
    
    /** Creates a new instance of RequestProcessor */
    public RequestProcessor() {
        params=new java.util.HashMap();
        cookies=new java.util.HashMap();
        headers=new java.util.HashMap();
        inputStream=null;
        errCode=-1;
        errMsg=null;
    }
    
    public static void config(Map prop){
        if(prop!=null)
            properties.putAll(prop);
    }
    
    public boolean init() throws Exception{
        return true;
    }
    
    public boolean usesWriter(){
        return true;
    }
    
    public boolean noCache(){
        return true;
    }
    
    public void process(java.io.OutputStream out) throws Exception{
    };
    
    public void process(java.io.PrintWriter out) throws Exception{
        startHead(out);
        head(out);
        endHead(out);
        startBody(out);
        body(out);
        endBody(out);
    };
    
    public void header(Vector v){
        if(cookies.size()>0){
            Iterator it=cookies.keySet().iterator();
            while(it.hasNext()){
                String key=(String)it.next();
                String value=(String)cookies.get(key);
                v.add(new String[]{COOKIE, key, value});
            }
        }
    }
    
    public void end(){
    }
    
    public boolean wantsInputStream(){
        return false;
    }
    
    public InputStream getInputStream(){
        return inputStream;
    }
    
    public void setInputStream(InputStream is){
        inputStream=is;
    }
         
    public int getIntParam(String name, int defaultValue){
        int result=defaultValue;
        String s=getParam(name);
        if(s!=null){
            try{
                result=Integer.parseInt(s);
            } catch(NumberFormatException ex){
            }
        }
        return result;
    }
    
    public Date getDateParam(String name, Date defaultValue, boolean atMidnight){
        Date result=defaultValue;
        String s=getParam(name);
        if(s!=null){
            try{
                result=edu.xtec.jclic.report.ReportUtils.strToDate(s, atMidnight);
            } catch(Exception ex){
            }
        }
        return result;
    }
    
    public String getParamNotNull(String name){
        String result=getParam(name, 0);
        if(result==null)
            result="";
        return result.trim();
    }
    
    public String getParam(String name){
        return getParam(name, 0);
    }
    
    public Object[] getParams(String name){
        return (Object[])params.get(name);
    }
    
    public String getParam(String name, int index){
        String result=null;
        Object[] array=(Object[])params.get(name);
        if(index>=0 && array!=null && array.length>index)
            result=(String)array[index];
        return result;
    }
    
    public void setParam(String name, String value){
        params.put(name, new String[]{value});
    }
    
    public void setParam(String name, String[] value){
        params.put(name, value);
    }
    
    public void setParams(java.util.Map map){
        //params.putAll(map);
        if(map!=null){
            java.util.Set s=map.keySet();
            Iterator it=s.iterator();
            while (it.hasNext()){
                Object o=it.next();
                Object val=map.get(o);
                if(o!=null){
                    if (val instanceof String)
                        setParam(o.toString(),(String)val);
                    else if(val instanceof String[])
                        setParam(o.toString(),(String[])val);
                }
            }
        }
    }
    
    public String getCookie(String name){
        return (String)cookies.get(name);
    }
    
    public void setCookie(String name, String value){
        cookies.put(name, value);
    }
    
    public void setCookies(java.util.Map map){
        cookies.putAll(map);
    }
    
    public void setHeaders(java.util.Map map){
        headers.putAll(map);
    }
    
    public java.util.Vector getHeaders(String headerName){
        return (java.util.Vector)headers.get(headerName.toLowerCase());
    }
    
    public String getHeader(String headerName){
        String result=null;
        java.util.Vector v=getHeaders(headerName);
        if(v!=null && !v.isEmpty())
            result=(String)v.get(0);
        return result;        
    }
    
    protected void startHead(java.io.PrintWriter out){
        out.println("<html>");
        out.println("<head>");
        out.print("<meta http-equiv=\"Content-Type\" content=\"text/html; ");
        out.print(CHARSET);        
        out.println("\">");
    }
    
    protected void head(java.io.PrintWriter out) throws Exception{
    };
    
    protected void endHead(java.io.PrintWriter out){
        out.println("</head>");
    }
    
    protected void linkStyle(String fileScreen, String filePrint, java.io.PrintWriter out){
        StringBuffer sb=new StringBuffer();
        sb.append("<link rel=\"stylesheet\" type=\"text/css\" href=\"");
        sb.append(fileScreen);
        if(filePrint!=null){
            sb.append("\" media=\"screen\">\n");
            sb.append("<link rel=\"stylesheet\" type=\"text/css\" href=\"");
            sb.append(filePrint).append("\" media=\"print\">");
        }
        else
            sb.append("\">");
        
        out.println(sb.substring(0));
    }
    
    protected void linkScript(String file, java.io.PrintWriter out){
        out.print("<script language=\"JavaScript\" src=\"");
        out.print(file);
        out.println("\" type=\"text/javascript\"></script>");
    }
    
    protected void writeScript(String text, java.io.PrintWriter out){
        out.println("<script language=\"JavaScript\" type=\"text/javascript\">");
        out.println("<!--");
        out.println(text);
        out.println("// -->");
        out.println("</script>");
    }
    
    protected void title(String prefix, String title, java.io.PrintWriter out){
        StringBuffer sb=new StringBuffer(200);
        sb.append("<title>");
        if(prefix!=null)
            sb.append(filter(prefix)).append(" - ");
        sb.append(filter(title));
        sb.append("</title>");
        out.println(sb.substring(0));
    }
    
    protected void startBody(java.io.PrintWriter out){
        out.println("<body>");
    }
    
    protected void body(java.io.PrintWriter out) throws Exception{
    };
    
    protected void endBody(java.io.PrintWriter out){
        out.println("</body>");
        out.println("</html>");
    }
    
    public static String filter(String input){
        String result=(input==null ? "" : input);
        if(input!=null && input.length()>0){
            StringBuffer filtered = new StringBuffer(input.length());
            char c;
            for(int i=0; i<input.length(); i++) {
                c = input.charAt(i);
                String s=null;
                switch(c){
                    case '<':
                        s="&lt;"; 
                        break;
                    case '>':
                        s="&gt;"; 
                        break;
                    case '"':
                        s="&quot;"; 
                        break;
                    case '&':
                        s="&amp;"; 
                        break;
                }                
                if(s!=null)
                    filtered.append(s);
                else
                    filtered.append(c);
            }
            result=filtered.substring(0);
        }        
        return result;
    }
    
    public static String escape(String input){
        String result=input;
        if(input!=null && input.length()>0){
            StringBuffer filtered = new StringBuffer(input.length());
            char c;
            for(int i=0; i<input.length(); i++) {
                c = input.charAt(i);
                String s=null;
                switch(c){
                    case '\'':
                        //s="&#39;"
                        s="\\'";
                        break;
                    case '\\':
                        s="\\\\";
                        break;
                }                
                if(s!=null)
                    filtered.append(s);
                else
                    filtered.append(c);
            }
            result=filtered.substring(0);
        }
        return result;
    }
    
    public static String toNbsp(String src){
        StringBuffer sb=new StringBuffer(src==null ? 0 : src.length()*2);        
        if(src!=null){
            StringTokenizer st=new StringTokenizer(src);
            if(st.hasMoreTokens()){
                while(true){
                    sb.append(st.nextToken());
                    if(st.hasMoreTokens())
                        sb.append("&nbsp;");
                    else
                        break;
                }
            }
        }
        return sb.substring(0);
    }
    
    public static void setDirectResources(boolean v){
        DIRECT_RESOURCES=v;
    }
        
    protected static String resourceUrl(String resource){
        String result=resource;
        if(!DIRECT_RESOURCES){
            StringBuffer sb=new StringBuffer(50);
            sb.append("resource?id=").append(resource);
            result=sb.substring(0);
        }
        return result;            
    }
        
    private static SimpleDateFormat HTTP_DF;
    public static String httpDate(Date date){
        if(HTTP_DF==null){
            HTTP_DF=new SimpleDateFormat("EEE, dd MMM yyyy HH:mm:ss zzz", Locale.US);
            HTTP_DF.setTimeZone(TimeZone.getTimeZone("GMT"));
        }
        return HTTP_DF.format(date);
    }
    
}