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 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.ofbiz.example;

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.StringReader;
import java.io.StringWriter;
import java.io.Writer;
import java.util.HashMap;
import java.util.Map;

import javax.print.Doc;
import javax.print.DocFlavor;
import javax.print.DocPrintJob;
import javax.print.PrintException;
import javax.print.PrintService;
import javax.print.PrintServiceLookup;
import javax.print.SimpleDoc;
import javax.print.attribute.HashPrintRequestAttributeSet;
import javax.print.attribute.PrintRequestAttributeSet;
import javax.print.attribute.standard.Copies;
import javax.print.attribute.standard.Sides;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.stream.StreamSource;

import org.apache.fop.apps.FOPException;
import org.apache.fop.apps.Fop;
import org.apache.fop.apps.MimeConstants;
import org.apache.ofbiz.base.util.Debug;
import org.apache.ofbiz.base.util.GeneralException;
import org.apache.ofbiz.entity.util.EntityUtilProperties;
import org.apache.ofbiz.service.DispatchContext;
import org.apache.ofbiz.service.ServiceUtil;
import org.apache.ofbiz.webapp.view.ApacheFopWorker;
import org.apache.ofbiz.widget.renderer.ScreenRenderer;
import org.apache.ofbiz.widget.renderer.ScreenStringRenderer;
import org.apache.ofbiz.widget.renderer.macro.MacroScreenRenderer;
import org.xml.sax.SAXException;

import freemarker.template.TemplateException;

public class ExamplePrintServices {
    public static final String module = ExamplePrintServices.class.getName();

    public static Map<String, Object> printReportPdf(DispatchContext dctx, Map<String, ? extends Object> context) {
        String screenLocation = "component://example/widget/example/ExampleReportScreens.xml";
        String reportScreenName = "ExampleReport";
        Map<String, Object> workContext = new HashMap<String, Object>();
        workContext.putAll(context);

        // render a screen to get the XML document
        Writer reportWriter = new StringWriter();
        ScreenStringRenderer screenStringRenderer = null;
        try {
            screenStringRenderer = new MacroScreenRenderer(EntityUtilProperties.getPropertyValue("widget", "screen.name", dctx.getDelegator()),
                    EntityUtilProperties.getPropertyValue("widget", "screen.screenrenderer", dctx.getDelegator()));
        } catch (TemplateException e) {
            String errMsg = "General error rendering screen [" + screenLocation + "]: " + e.toString();
            Debug.logError(e, errMsg, module);
            return ServiceUtil.returnError(errMsg);
        } catch (IOException e) {
            String errMsg = "IO error rendering screen [" + screenLocation + "]: " + e.toString();
            Debug.logError(e, errMsg, module);
            return ServiceUtil.returnError(errMsg);
        }

        ScreenRenderer reportScreenRenderer = new ScreenRenderer(reportWriter, null, screenStringRenderer);
        reportScreenRenderer.populateContextForService(dctx, workContext);

        // put the exampleId in the screen context, is a parameter coming into the service
        //reportScreenRenderer.getContext().put("exampleId", context.get("exampleId"));

        try {
            reportScreenRenderer.render(screenLocation, reportScreenName);
        } catch (GeneralException e) {
            String errMsg = "General error rendering screen [" + screenLocation + "]: " + e.toString();
            Debug.logError(e, errMsg, module);
            return ServiceUtil.returnError(errMsg);
        } catch (IOException e) {
            String errMsg = "IO error rendering screen [" + screenLocation + "]: " + e.toString();
            Debug.logError(e, errMsg, module);
            return ServiceUtil.returnError(errMsg);
        } catch (SAXException e) {
            String errMsg = "SAX (XML parse) error rendering screen [" + screenLocation + "]: " + e.toString();
            Debug.logError(e, errMsg, module);
            return ServiceUtil.returnError(errMsg);
        } catch (ParserConfigurationException e) {
            String errMsg = "Parser configuration error rendering screen [" + screenLocation + "]: " + e.toString();
            Debug.logError(e, errMsg, module);
            return ServiceUtil.returnError(errMsg);
        }

        // set the input source (XSL-FO) and generate the PDF
        StreamSource src = new StreamSource(new StringReader(reportWriter.toString()));

        // create the output stream for the generation
        ByteArrayOutputStream out = new ByteArrayOutputStream();

        try {
            Fop fop = ApacheFopWorker.createFopInstance(out, MimeConstants.MIME_PDF);
            ApacheFopWorker.transform(src, null, fop);
        } catch (FOPException e) {
            // TODO Auto-generated catch block
            e.printStackTrace();
        }


        /*
        // set the content type and length
        response.setContentType("application/pdf");
        response.setContentLength(out.size());

        // write to the browser
        try {
            out.writeTo(response.getOutputStream());
            response.getOutputStream().flush();
        } catch (IOException e) {
            throw new ViewHandlerException("Unable write to browser OutputStream", e);
        }
        */

        DocFlavor docFlavor = DocFlavor.BYTE_ARRAY.PDF;
        Doc myDoc = new SimpleDoc(out.toByteArray(), docFlavor, null);
        PrintRequestAttributeSet aset = new HashPrintRequestAttributeSet();
        aset.add(new Copies(1));
        //aset.add(MediaSize.A4);
        aset.add(Sides.ONE_SIDED);

        PrintService[] services = PrintServiceLookup.lookupPrintServices(docFlavor, aset);
        if (services.length > 0) {
            DocPrintJob job = services[0].createPrintJob();
            try {
                job.print(myDoc, aset);
            } catch (PrintException pe) {
                String errMsg = "Unable to print PDF from XSL-FO: " + pe.toString();
                Debug.logError(pe, errMsg, module);
                return ServiceUtil.returnError(errMsg);
            }
        }

        return ServiceUtil.returnSuccess();
    }
}