/*
 * 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.
 */

/* $Id$ */

package org.apache.fop.pdf;

// Java
import java.awt.geom.Rectangle2D;
import java.util.Set;

/**
 * class representing an /Annot object of /Subtype /Link
 */
public class PDFLink extends PDFObject {
    /**
     * Used to represent an external link.
     */
    public static final int EXTERNAL = 0;

    /**
     * Used to represent an internal link.
     */
    public static final int INTERNAL = 1;

    private float ulx;
    private float uly;
    private float brx;
    private float bry;
    private String color;
    private PDFAction action;
    private Integer structParent;

    /**
     * create objects associated with a link annotation (GoToR)
     *
     * @param r the rectangle of the link hotspot in absolute coordinates
     */
    public PDFLink(Rectangle2D r) {
        /* generic creation of PDF object */
        super();

        this.ulx = (float)r.getX();
        this.uly = (float)r.getY();
        this.brx = (float)(r.getX() + r.getWidth());
        this.bry = (float)(r.getY() + r.getHeight());
        this.color = "0 0 0";    // just for now

    }

    /**
     * Set the pdf action for this link.
     * @param action the pdf action that is activated for this link
     */
    public void setAction(PDFAction action) {
        this.action = action;
    }


    /**
     * Sets the value of the StructParent entry for this link.
     *
     * @param structParent key in the structure parent tree
     */
    public void setStructParent(int structParent) {
        this.structParent = structParent;
    }

    /**
     * {@inheritDoc}
     */
    public String toPDFString() {
        getDocumentSafely().getProfile().verifyAnnotAllowed();
        String fFlag = "";
        if (getDocumentSafely().getProfile().getPDFAMode().isEnabled()) {
            int f = 0;
            f |= 1 << (3 - 1); //Print, bit 3
            f |= 1 << (4 - 1); //NoZoom, bit 4
            f |= 1 << (5 - 1); //NoRotate, bit 5
            fFlag = "/F " + f;
        }
        String s = "<< /Type /Annot\n" + "/Subtype /Link\n" + "/Rect [ "
                   + (ulx) + " " + (uly) + " "
                   + (brx) + " " + (bry) + " ]\n" + "/C [ "
                   + this.color + " ]\n" + "/Border [ 0 0 0 ]\n" + "/A "
                   + this.action.getAction() + "\n" + "/H /I\n"
                   + (this.structParent != null
                           ? "/StructParent " + this.structParent.toString() + "\n" : "")
                   + fFlag + "\n>>";
        return s;
    }

    /*
     * example
     * 19 0 obj
     * <<
     * /Type /Annot
     * /Subtype /Link
     * /Rect [ 176.032 678.48412 228.73579 692.356 ]
     * /C [ 0.86491 0.03421 0.02591 ]
     * /Border [ 0 0 1 ]
     * /A 28 0 R
     * /H /I
     * >>
     * endobj
     */

    /** {@inheritDoc} */
    protected boolean contentEquals(PDFObject obj) {
        if (this == obj) {
            return true;
        }

        if (obj == null || !(obj instanceof PDFLink)) {
            return false;
        }

        PDFLink link = (PDFLink)obj;

        if (!((link.ulx == ulx) && (link.uly == uly)
              && (link.brx == brx) && (link.bry == bry))) {
            return false;
        }

        if (!(link.color.equals(color)
             && link.action.getAction().equals(action.getAction()))) {
            return false;
        }

        return true;
    }

    @Override
    public void getChildren(Set<PDFObject> children) {
        super.getChildren(children);
        if (action.hasObjectNumber()) {
            children.add(action);
        }
        action.getChildren(children);
    }
}