/*
 * 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.pdmodel.interactive.annotation;

import java.io.IOException;

import org.apache.pdfbox.cos.COSDictionary;
import org.apache.pdfbox.cos.COSName;
import org.apache.pdfbox.pdmodel.PDDocument;
import org.apache.pdfbox.pdmodel.common.filespecification.PDFileSpecification;
import org.apache.pdfbox.pdmodel.interactive.annotation.handlers.PDAppearanceHandler;
import org.apache.pdfbox.pdmodel.interactive.annotation.handlers.PDFileAttachmentAppearanceHandler;

/**
 * This is the class that represents a file attachment.
 *
 * @author Ben Litchfield
 */
public class PDAnnotationFileAttachment extends PDAnnotationMarkup
{
    /**
     * See get/setAttachmentName.
     */
    public static final String ATTACHMENT_NAME_PUSH_PIN = "PushPin";
    /**
     * See get/setAttachmentName.
     */
    public static final String ATTACHMENT_NAME_GRAPH = "Graph";
    /**
     * See get/setAttachmentName.
     */
    public static final String ATTACHMENT_NAME_PAPERCLIP = "Paperclip";
    /**
     * See get/setAttachmentName.
     */
    public static final String ATTACHMENT_NAME_TAG = "Tag";

    /**
     * The type of annotation.
     */
    public static final String SUB_TYPE = "FileAttachment";

    private PDAppearanceHandler customAppearanceHandler;

    /**
     * Constructor.
     */
    public PDAnnotationFileAttachment()
    {
        getCOSObject().setName(COSName.SUBTYPE, SUB_TYPE);
    }

    /**
     * Creates a Link annotation from a COSDictionary, expected to be a correct object definition.
     *
     * @param field the PDF object to represent as a field.
     */
    public PDAnnotationFileAttachment(COSDictionary field)
    {
        super(field);
    }

    /**
     * Return the attached file.
     *
     * @return The attached file.
     *
     * @throws IOException If there is an error creating the file spec.
     */
    public PDFileSpecification getFile() throws IOException
    {
        return PDFileSpecification.createFS(getCOSObject().getDictionaryObject(COSName.FS));
    }

    /**
     * Set the attached file.
     *
     * @param file The file that is attached.
     */
    public void setFile(PDFileSpecification file)
    {
        getCOSObject().setItem(COSName.FS, file);
    }

    /**
     * This is the name used to draw the type of attachment. See the ATTACHMENT_NAME_XXX constants.
     *
     * @return The name that describes the visual cue for the attachment.
     */
    public String getAttachmentName()
    {
        return getCOSObject().getNameAsString(COSName.NAME, ATTACHMENT_NAME_PUSH_PIN);
    }

    /**
     * Set the name used to draw the attachment icon. See the ATTACHMENT_NAME_XXX constants.
     *
     * @param name The name of the visual icon to draw.
     */
    public void setAttachmentName(String name)
    {
        getCOSObject().setName(COSName.NAME, name);
    }

    /**
     * Set a custom appearance handler for generating the annotations appearance streams.
     * 
     * @param appearanceHandler custom appearance handler
     */
    public void setCustomAppearanceHandler(PDAppearanceHandler appearanceHandler)
    {
        customAppearanceHandler = appearanceHandler;
    }

    @Override
    public void constructAppearances()
    {
        this.constructAppearances(null);
    }

    @Override
    public void constructAppearances(PDDocument document)
    {
        if (customAppearanceHandler == null)
        {
            PDFileAttachmentAppearanceHandler appearanceHandler = new PDFileAttachmentAppearanceHandler(this, document);
            appearanceHandler.generateAppearanceStreams();
        }
        else
        {
            customAppearanceHandler.generateAppearanceStreams();
        }
    }
}
