/*
 * $Id: JasperReportsPdfViewHandler.java,v 1.1 2008/02/06 10:43:20 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.view;

import java.io.IOException;
import java.io.InputStream;
import java.util.Map;

import javax.servlet.ServletContext;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

import net.sf.jasperreports.engine.JRDataSource;
import net.sf.jasperreports.engine.JREmptyDataSource;
import net.sf.jasperreports.engine.JasperCompileManager;
import net.sf.jasperreports.engine.JasperExportManager;
import net.sf.jasperreports.engine.JasperFillManager;
import net.sf.jasperreports.engine.JasperPrint;
import net.sf.jasperreports.engine.JasperReport;

import org.ofbiz.base.util.Debug;
import org.ofbiz.base.util.UtilHttp;
import org.ofbiz.base.util.cache.UtilCache;
import org.ofbiz.webapp.control.ContextFilter;
import org.ofbiz.entity.GenericDelegator;
import org.ofbiz.entity.jdbc.ConnectionFactory;

/**
 * Handles JasperReports PDF view rendering
 *
 * @author     <a href="mailto:jonesde@ofbiz.org">David E. Jones</a>
 * @version    $Rev: 5966 $
 * @since      2.0
 */
public class JasperReportsPdfViewHandler implements ViewHandler {
    
    public static final String module = JasperReportsPdfViewHandler.class.getName();

    protected ServletContext context;
    public static UtilCache jasperReportsCompiledCache = new UtilCache("webapp.JasperReportsCompiled");

    public void init(ServletContext context) throws ViewHandlerException {
        this.context = context;
    }

    public void render(String name, String page, String info, String contentType, String encoding, HttpServletRequest request, HttpServletResponse response) throws ViewHandlerException {
        // some containers call filters on EVERY request, even forwarded ones,
        // so let it know that it came from the control servlet

        if (request == null) {
            throw new ViewHandlerException("The HttpServletRequest object was null, how did that happen?");
        }
        if (page == null || page.length() == 0) {
            throw new ViewHandlerException("View page was null or empty, but must be specified");
        }
        if (info == null || info.length() == 0) {
            Debug.logInfo("View info string was null or empty, (optionally used to specify an Entity that is mapped to the Entity Engine datasource that the report will use).", module);
        }

        // tell the ContextFilter we are forwarding
        request.setAttribute(ContextFilter.FORWARDED_FROM_SERVLET, new Boolean(true));
        GenericDelegator delegator = (GenericDelegator) request.getAttribute("delegator");
        if (delegator == null) {
            throw new ViewHandlerException("The delegator object was null, how did that happen?");
        }

        try {
            JasperReport report = (JasperReport) jasperReportsCompiledCache.get(page);
            if (report == null) {
                synchronized (this) {
                    report = (JasperReport) jasperReportsCompiledCache.get(page);
                    if (report == null) {
                        InputStream is = context.getResourceAsStream(page);
                        report = JasperCompileManager.compileReport(is);
                        jasperReportsCompiledCache.put(page, report);
                    }
                }
            }
            
            response.setContentType("application/pdf");

            Map parameters = (Map) request.getAttribute("jrParameters");
            if (parameters == null) {
                parameters = UtilHttp.getParameterMap(request);
            }

            JRDataSource jrDataSource = (JRDataSource) request.getAttribute("jrDataSource");
            JasperPrint jp = null;
            if (jrDataSource == null) {
                String datasourceName = delegator.getEntityHelperName(info);
                if (datasourceName != null && datasourceName.length() > 0) {
                    Debug.logInfo("Filling report with connection from datasource: " + datasourceName, module);
                    jp = JasperFillManager.fillReport(report, parameters, ConnectionFactory.getConnection(datasourceName));
                } else {
                    Debug.logInfo("Filling report with an empty JR datasource", module);
                    jp = JasperFillManager.fillReport(report, parameters, new JREmptyDataSource());
                }
            } else {
                Debug.logInfo("Filling report with a passed in jrDataSource", module);
                jp = JasperFillManager.fillReport(report, parameters, jrDataSource);
            }

            if (jp.getPages().size() < 1) {
                throw new ViewHandlerException("Report is Empty (no results?)");
            } else {
                Debug.logInfo("Got report, there are " + jp.getPages().size() + " pages.", module);
            }
            JasperExportManager.exportReportToPdfStream(jp, response.getOutputStream());
        } catch (IOException ie) {
            throw new ViewHandlerException("IO Error in report", ie);
        } catch (java.sql.SQLException e) {
            throw new ViewHandlerException("Database error while running report", e);
        } catch (Exception e) {
            throw new ViewHandlerException("Error in report", e);
            // } catch (ServletException se) {
            // throw new ViewHandlerException("Error in region", se.getRootCause());
        }
    }
}
