/*
 * 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.pdfbox.examples.interactive.form;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.PDPage;
import org.apache.pdfbox.pdmodel.PDResources;
import org.apache.pdfbox.pdmodel.common.PDRectangle;
import org.apache.pdfbox.pdmodel.font.PDFont;
import org.apache.pdfbox.pdmodel.font.PDType1Font;
import org.apache.pdfbox.pdmodel.font.Standard14Fonts.FontName;
import org.apache.pdfbox.pdmodel.graphics.color.PDColor;
import org.apache.pdfbox.pdmodel.graphics.color.PDDeviceRGB;
import org.apache.pdfbox.pdmodel.interactive.annotation.PDAnnotationWidget;
import org.apache.pdfbox.pdmodel.interactive.annotation.PDAppearanceCharacteristicsDictionary;
import org.apache.pdfbox.pdmodel.interactive.form.PDAcroForm;
import org.apache.pdfbox.pdmodel.interactive.form.PDTextField;

/**
 * An example of creating an AcroForm and a form field from scratch, with two widgets for one field:
 * This means that the same field is visible on two separate pages, but can be on different
 * positions and different size and colors. Changing the value on one page will also change it on
 * the other page.
 *
 * The form field is created with properties similar to creating a form with default settings in
 * Adobe Acrobat.
 *
 */
public final class CreateMultiWidgetsForm
{
    private CreateMultiWidgetsForm()
    {
    }

    public static void main(String[] args) throws IOException
    {
        // Create a new document with 2 empty pages.
        try (PDDocument document = new PDDocument())
        {
            PDPage page1 = new PDPage(PDRectangle.A4);
            document.addPage(page1);
            PDPage page2 = new PDPage(PDRectangle.A4);
            document.addPage(page2);
            
            // Adobe Acrobat uses Helvetica as a default font and
            // stores that under the name '/Helv' in the resources dictionary
            PDFont font = new PDType1Font(FontName.HELVETICA);
            PDResources resources = new PDResources();
            resources.put(COSName.HELV, font);
            
            // Add a new AcroForm and add that to the document
            PDAcroForm acroForm = new PDAcroForm(document);
            document.getDocumentCatalog().setAcroForm(acroForm);
            
            // Add and set the resources and default appearance at the form level
            acroForm.setDefaultResources(resources);
            
            // Acrobat sets the font size on the form level to be
            // auto sized as default. This is done by setting the font size to '0'
            String defaultAppearanceString = "/Helv 0 Tf 0 g";
            acroForm.setDefaultAppearance(defaultAppearanceString);
            
            // Add a form field to the form.
            PDTextField textBox = new PDTextField(acroForm);
            textBox.setPartialName("SampleField");

            // Acrobat sets the font size to 12 as default
            // This is done by setting the font size to '12' on the
            // field level.
            // The text color is set to blue in this example.
            // To use black, replace "0 0 1 rg" with "0 0 0 rg" or "0 g".
            defaultAppearanceString = "/Helv 12 Tf 0 0 1 rg";
            textBox.setDefaultAppearance(defaultAppearanceString);
            
            // add the field to the AcroForm
            acroForm.getFields().add(textBox);
            
            // Specify 1st annotation associated with the field
            PDAnnotationWidget widget1 = new PDAnnotationWidget();
            PDRectangle rect = new PDRectangle(50, 750, 250, 50);
            widget1.setRectangle(rect);
            widget1.setPage(page1);
            widget1.setParent(textBox);
            
            // Specify 2nd annotation associated with the field
            PDAnnotationWidget widget2 = new PDAnnotationWidget();
            PDRectangle rect2 = new PDRectangle(200, 650, 100, 50);
            widget2.setRectangle(rect2);
            widget2.setPage(page2);
            widget2.setParent(textBox);
            
            // set green border and yellow background for 1st widget
            // if you prefer defaults, delete this code block
            PDAppearanceCharacteristicsDictionary fieldAppearance1
                    = new PDAppearanceCharacteristicsDictionary(new COSDictionary());
            fieldAppearance1.setBorderColour(new PDColor(new float[]{0,1,0}, PDDeviceRGB.INSTANCE));
            fieldAppearance1.setBackground(new PDColor(new float[]{1,1,0}, PDDeviceRGB.INSTANCE));
            widget1.setAppearanceCharacteristics(fieldAppearance1);
            
            // set red border and green background for 2nd widget
            // if you prefer defaults, delete this code block
            PDAppearanceCharacteristicsDictionary fieldAppearance2
                    = new PDAppearanceCharacteristicsDictionary(new COSDictionary());
            fieldAppearance2.setBorderColour(new PDColor(new float[]{1,0,0}, PDDeviceRGB.INSTANCE));
            fieldAppearance2.setBackground(new PDColor(new float[]{0,1,0}, PDDeviceRGB.INSTANCE));
            widget2.setAppearanceCharacteristics(fieldAppearance2);
            
            List <PDAnnotationWidget> widgets = new ArrayList<>();
            widgets.add(widget1);
            widgets.add(widget2);
            textBox.setWidgets(widgets);
            
            // make sure the annotations are visible on screen and paper
            widget1.setPrinted(true);
            widget2.setPrinted(true);
            
            // Add the annotations to the pages
            page1.getAnnotations().add(widget1);
            page2.getAnnotations().add(widget2);
            
            // set the field value
            textBox.setValue("Sample field");
            
            document.save("target/MultiWidgetsForm.pdf");
        }
    }
}
