/*
 * $Id: OfbizUrlTransform.java,v 1.1 2008/02/06 10:43:01 linkconsulting Exp $
 *
 * Copyright (c) 2001-2003 The Open For Business Project - www.ofbiz.org
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * the rights to use, copy, modify, merge, publish, distribute, sublicense,
 * and/or sell copies of the Software, and to permit persons to whom the
 * Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included
 * in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
 * OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
 * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT
 * OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR
 * THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */
package org.ofbiz.webapp.ftl;

import java.io.IOException;
import java.io.Writer;
import java.util.Map;
import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import freemarker.core.Environment;
import freemarker.ext.beans.BeanModel;
import freemarker.template.SimpleScalar;
import freemarker.template.TemplateModelException;
import freemarker.template.TemplateScalarModel;
import freemarker.template.TemplateTransformModel;

import org.ofbiz.base.util.template.FreeMarkerWorker;
import org.ofbiz.entity.GenericValue;
import org.ofbiz.webapp.control.RequestHandler;

/**
 * OfbizUrlTransform - Freemarker Transform for URLs (links)
 *
 * @author     <a href="mailto:jaz@ofbiz.org">Andy Zeneski</a>
 * @version    $Rev: 5462 $
 * @since      2.1
 */
public class OfbizUrlTransform implements TemplateTransformModel {
    
    public boolean checkArg(Map args, String key, boolean defaultValue) {
        if (!args.containsKey(key)) {        
            return defaultValue;
        } else {
            Object o = args.get(key);
            if (o instanceof SimpleScalar) {
                SimpleScalar s = (SimpleScalar) o;
                return "true".equalsIgnoreCase(s.getAsString());
            }
            return defaultValue;
        }
    }
    
    public Writer getWriter(final Writer out, Map args) {                      
        final StringBuffer buf = new StringBuffer();
        final boolean fullPath = checkArg(args, "fullPath", false);
        final boolean secure = checkArg(args, "secure", false);
        final boolean encode = checkArg(args, "encode", true);
        
        return new Writer(out) {
            public void write(char cbuf[], int off, int len) {
                buf.append(cbuf, off, len);
            }

            public void flush() throws IOException {
                out.flush();
            }

            public void close() throws IOException {  
                try {                              
                    Environment env = Environment.getCurrentEnvironment();
                    BeanModel req = (BeanModel) env.getVariable("request");
                    BeanModel res = (BeanModel) env.getVariable("response");
                    Object prefix = env.getVariable("urlPrefix");
                    if (req != null) {
                        HttpServletRequest request = (HttpServletRequest) req.getWrappedObject();
                        ServletContext ctx = (ServletContext) request.getAttribute("servletContext");
                        HttpServletResponse response = null;
                        if (res != null) {
                            response = (HttpServletResponse) res.getWrappedObject();
                        }
                                            
                        // make the link
                        RequestHandler rh = (RequestHandler) ctx.getAttribute("_REQUEST_HANDLER_");
                        out.write(rh.makeLink(request, response, buf.toString(), fullPath, secure, encode));
                    } else if (prefix != null) {
                        if (prefix instanceof TemplateScalarModel) {
                            TemplateScalarModel s = (TemplateScalarModel) prefix;
                            String prefixString = s.getAsString();
                            String bufString = buf.toString();
                            boolean prefixSlash = prefixString.endsWith("/");
                            boolean bufSlash = bufString.startsWith("/");
                            if (prefixSlash && bufSlash) {
                                bufString = bufString.substring(1);
                            } else if (!prefixSlash && !bufSlash) {
                                bufString = "/" + bufString;
                            }
                            out.write(prefixString + bufString);
                        }
                    } else {
                        out.write(buf.toString());
                    }
                } catch (TemplateModelException e) {
                    throw new IOException(e.getMessage());
                }
            }
        };
    }
}
