package org.jadice.examples;

import java.io.File;
import java.io.FileOutputStream;

import com.jadice.web.print.stream.server.AbstractPDFStreamPrintingServerOperation;
import com.jadice.web.print.stream.server.printer.StreamPrinter;

import com.levigo.jadice.document.Document;
import com.levigo.jadice.document.DocumentLayer;
import com.levigo.jadice.document.Page;
import com.levigo.jadice.printer.PrintDecorations;
import com.levigo.jadice.web.demo.common.server.print.PrintStreamMeta;
import com.levigo.jadice.web.demo.common.server.print.PrintStreamRepository;
import com.levigo.jadice.web.demo.common.shared.print.StreamPrintingCompletedMessage;
import com.levigo.jadice.web.demo.showcase.shared.DecorationPDFPrintOperationParameters;
import com.levigo.jadice.web.shared.model.serveroperation.ServerOperationMessage;


/**
 * A class which shows how page modifications can be made before offering them to be downloaded.
 */
public class DecorationPDFPrintOperation
    extends
      AbstractPDFStreamPrintingServerOperation<DecorationPDFPrintOperationParameters, ServerOperationMessage> {


  // The repository where the created file is registered to allow clients to download it.
  private final PrintStreamRepository registry;
 
  /**
   * Creates a new {@link DecorationPDFPrintOperation} which will register the created documents at
   * the given {@link PrintStreamRepository}
   * 
   * @param registry the {@link PrintStreamRepository} where created documents shall be registered
   *          so they can be downloaded.
   */
  public DecorationPDFPrintOperation(PrintStreamRepository registry) {
    this.registry = registry;
  }

  @Override
  protected void doPrint(Request request, ResponseChannel responseChannel, StreamPrinter streamPrinter)
      throws Exception {


    // Get the document to add the watermark to from the request
    Document document = request.getDocument();


    // Elements in the layer POSTDECORATION cover document contents
    DocumentLayer targetLayer = PrintDecorations.POSTDECORATION;


    // Iterate over all pages of the document
    for (Page p : document.getPages()) {


      // Create a pageSegment containing the text "DRAFT" as big as the page. The watermark is
      // created for each page in case the document contains pages with different dimensions
      p.add(targetLayer, WatermarkHelper.createWatermarkPageSegment("DRAFT", p.getSize()));


      // add the page to the streamPrinter
      streamPrinter.getSourcePages().add(p);
    }


    // create a temporary file to which the
    final File file = File.createTempFile("print-stream-", ".pdf");
    final FileOutputStream output = new FileOutputStream(file);


    // write the document to the temporary file
    streamPrinter.print(output);
    output.close();

    // Register the file with its metadata at the PrintStreamRepository to allow clients to download
    // the file
    final PrintStreamMeta meta = new PrintStreamMeta(file);
    meta.setMimeType("application/pdf");
    final String id = registry.register(meta);


    // notify the client about the finished streamPrinting
    responseChannel.send(new StreamPrintingCompletedMessage(id));
  }
}