<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Pdf
 * @subpackage Annotation
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id:
 */

/** Zend_Pdf_Annotation */
require_once 'Zend/Pdf/Annotation.php';

/** Zend_Pdf_Destination */
require_once 'Zend/Pdf/Destination.php';


/**
 * A link annotation represents either a hypertext link to a destination elsewhere in
 * the document or an action to be performed.
 *
 * Only destinations are used now since only GoTo action can be created by user
 * in current implementation.
 *
 * @package    Zend_Pdf
 * @subpackage Annotation
 * @copyright  Copyright (c) 2005-2009 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Pdf_Annotation_Link extends Zend_Pdf_Annotation
{
    /**
     * Annotation object constructor
     *
     * @throws Zend_Pdf_Exception
     */
    public function __construct(Zend_Pdf_Element $annotationDictionary)
    {
        if ($annotationDictionary->getType() != Zend_Pdf_Element::TYPE_DICTIONARY) {
            require_once 'Zend/Pdf/Exception.php';
            throw new Zend_Pdf_Exception('Annotation dictionary resource has to be a dictionary.');
        }

        if ($annotationDictionary->Subtype === null  ||
            $annotationDictionary->Subtype->getType() != Zend_Pdf_Element::TYPE_NAME  ||
            $annotationDictionary->Subtype->value != 'Link') {
            require_once 'Zend/Pdf/Exception.php';
            throw new Zend_Pdf_Exception('Subtype => Link entry is requires');
        }

        parent::__construct($annotationDictionary);
    }

    /**
     * Create link annotation object
     *
     * @param float $x1
     * @param float $y1
     * @param float $x2
     * @param float $y2
     * @param Zend_Pdf_Target|string $target
     * @return Zend_Pdf_Annotation_Link
     */
    public static function create($x1, $y1, $x2, $y2, $target)
    {
        if (is_string($target)) {
            require_once 'Zend/Pdf/Destination/Named.php';
            $destination = Zend_Pdf_Destination_Named::create($target);
        }
        if (!$target instanceof Zend_Pdf_Target) {
            require_once 'Zend/Pdf/Exception.php';
            throw new Zend_Pdf_Exception('$target parameter must be a Zend_Pdf_Target object or a string.');
        }

    	$annotationDictionary = new Zend_Pdf_Element_Dictionary();

    	$annotationDictionary->Type    = new Zend_Pdf_Element_Name('Annot');
    	$annotationDictionary->Subtype = new Zend_Pdf_Element_Name('Link');

    	$rectangle = new Zend_Pdf_Element_Array();
    	$rectangle->items[] = new Zend_Pdf_Element_Numeric($x1);
    	$rectangle->items[] = new Zend_Pdf_Element_Numeric($y1);
    	$rectangle->items[] = new Zend_Pdf_Element_Numeric($x2);
    	$rectangle->items[] = new Zend_Pdf_Element_Numeric($y2);
    	$annotationDictionary->Rect = $rectangle;

    	if ($target instanceof Zend_Pdf_Destination) {
            $annotationDictionary->Dest = $target->getResource();
    	} else {
            $annotationDictionary->A = $target->getResource();
    	}

        return new Zend_Pdf_Annotation_Link($annotationDictionary);
    }

    /**
     * Set link annotation destination
     *
     * @param Zend_Pdf_Target|string $target
     * @return Zend_Pdf_Annotation_Link
     */
    public function setDestination($target)
    {
        if (is_string($target)) {
            require_once 'Zend/Pdf/Destination/Named.php';
            $destination = Zend_Pdf_Destination_Named::create($target);
        }
        if (!$target instanceof Zend_Pdf_Target) {
            require_once 'Zend/Pdf/Exception.php';
            throw new Zend_Pdf_Exception('$target parameter must be a Zend_Pdf_Target object or a string.');
        }

        $this->_annotationDictionary->touch();
        $this->_annotationDictionary->Dest = $destination->getResource();
        if ($target instanceof Zend_Pdf_Destination) {
            $this->_annotationDictionary->Dest = $target->getResource();
            $this->_annotationDictionary->A    = null;
        } else {
            $this->_annotationDictionary->Dest = null;
            $this->_annotationDictionary->A    = $target->getResource();
        }

        return $this;
    }

    /**
     * Get link annotation destination
     *
     * @return Zend_Pdf_Target|null
     */
    public function getDestination()
    {
    	if ($this->_annotationDictionary->Dest === null  &&
    	    $this->_annotationDictionary->A    === null) {
    		return null;
    	}

        if ($this->_annotationDictionary->Dest !== null) {
        	return Zend_Pdf_Destination::load($this->_annotationDictionary->Dest);
        } else {
        	return Zend_Pdf_Action::load($this->_annotationDictionary->A);
        }
    }
}
