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<?php
/**
 * Provides functionality to list (or get) objects related to the current object based on a search of the tags
 * the assigned to the current object.
 *
 * @author Malte Müller (acrylian)
 * @package plugins
 * @subpackage related-items
 */
$plugin_description = gettext('Provides functionality to get the related items to an item based on a tag search.');
$plugin_author = "Malte Müller (acrylian)";
$plugin_category = gettext('Media');

function getRelatedItems($type = 'news', $album = NULL) {
    global $_zp_gallery, $_zp_current_album, $_zp_current_image, $_zp_current_zenpage_page, $_zp_current_zenpage_news, $_zp_gallery_page;
    $tags = getTags();
    if (!empty($tags)) { // if there are tags at all
        $searchstring = '';
        $count = '';
        foreach ($tags as $tag) {
            $count++;
            if ($count == 1) {
                $bool = '';
            } else {
                $bool = '|'; // connect tags by OR to get a wide range
            }
            $searchstring .= $bool . $tag;
        }
        $paramstr = urlencode('words') . '=' . $searchstring . '&searchfields=tags';
        if (!is_null($album)) {
            $paramstr = '&albumname=' . urlencode($album);
        }
        $search = new SearchEngine();
        switch ($type) {
            case 'albums':
                $paramstr .= '&inalbums=1';
                break;
            case 'images':
                $paramstr .= '&inimages=1';
                break;
            case 'news':
                $paramstr .= '&innews=1';
                break;
            case 'pages':
                $paramstr .= '&inpages=1';
                break;
            case 'all':
                $paramstr .= '&inalbums=1&inimages=1&innews=1&inpages=1';
                break;
        }
        $search->setSearchParams($paramstr);
        // get the results
        switch ($type) {
            case 'albums':
                $albumresult = $search->getAlbums(0, "date", "desc");
                $result = createRelatedItemsResultArray($albumresult, $type);
                break;
            case 'images':
                $imageresult = $search->getImages(0, 0, 'date', 'desc');
                $result = createRelatedItemsResultArray($imageresult, $type);
                break;
            case 'news':
                $newsresult = $search->getArticles(0, NULL, true, "date", "desc");
                $result = createRelatedItemsResultArray($newsresult, $type);
                break;
            case 'pages':
                $pageresult = $search->getPages();
                $result = createRelatedItemsResultArray($pageresult, $type);
                break;
            case 'all':
                $albumresult = $search->getAlbums(0, "date", "desc");
                $imageresult = $search->getImages(0, 0, 'date', 'desc');
                $newsresult = $search->getArticles(0, NULL, true, "date", "desc");
                $pageresult = $search->getPages();
                $result1 = createRelatedItemsResultArray($albumresult, 'albums');
                $result2 = createRelatedItemsResultArray($imageresult, 'images');
                $result3 = createRelatedItemsResultArray($newsresult, 'news');
                $result4 = createRelatedItemsResultArray($pageresult, 'pages');
                $result = array_merge($result1, $result2, $result3, $result4);
                $result = sortMultiArray($result, 'weight', true, true, false, false); // sort by search result weight
                break;
        }
        return $result;
    }
    return array();
}

/**
 * Helper function for getRelatedItems() only.
 * Returns an array with array for each item with name, album (images only), type and weight (search weight value)
 * Excludes the current item itself.
 *
 * @param array $result array with search results
 * @param string $type "albums", "images", "news", "pages"
 */
function createRelatedItemsResultArray($result, $type) {
    global $_zp_gallery, $_zp_current_album, $_zp_current_image, $_zp_current_zenpage_page, $_zp_current_zenpage_news, $_zp_gallery_page;
    switch ($_zp_gallery_page) {
        case 'album.php':
            $current = $_zp_current_album;
            break;
        case 'image.php':
            $current = $_zp_current_image;
            break;
        case 'news.php':
            $current = $_zp_current_zenpage_news;
            break;
        case 'pages.php':
            $current = $_zp_current_zenpage_page;
            break;
    }
    $results = array();
    foreach ($result as $item) {
        switch ($type) {
            case 'albums':
                if (!isAlbumClass($current) || $current->name != $item) {
                    array_push($results, array('name' => $item, 'album' => '', 'type' => $type, 'weight' => '13')); // doesn't have weight so we just add one for sorting later
                }
                break;
            case 'images':
                if (!isImageClass($current) || $current->filename != $item['filename']) {
                    array_push($results, array('name' => $item['filename'], 'album' => $item['folder'], 'type' => $type, 'weight' => $item['weight']));
                }
                break;
            case 'news':
                if (get_class($current) != 'ZenpageNews' || $current->getTitlelink() != $item['titlelink']) {

                    if (!isset($item['weight']))
                        $item['weight'] = 13; //    there are circumstances where weights are not generated.

                    array_push($results, array('name' => $item['titlelink'], 'album' => '', 'type' => $type, 'weight' => $item['weight']));
                }
                break;
            case 'pages':
                if (get_class($current) != 'ZenpagePage' || $current->getTitlelink() != $item) {
                    array_push($results, array('name' => $item, 'album' => '', 'type' => $type, 'weight' => '13')); // doesn't have weight so we just add one for sorting later
                }
                break;
        }
    }
    return $results;
}

/**
 * Prints the x related articles based on a tag search
 *
 * @param int $number Number of items to get
 * @param string $type 'albums', 'images','news','pages', "all" for all combined.
 * @param string $specific If $type = 'albums' or 'images' name of album
 * @param bool $excerpt If a text excerpt (gallery items: description; Zenpage items: content) should be shown. NULL for none or number of length
 * @param bool $thumb For $type = 'albums' or 'images' if a thumb should be shown (default size as set on the options)
 */
function printRelatedItems($number = 5, $type = 'news', $specific = NULL, $excerpt = NULL, $thumb = false, $date = false) {
    global $_zp_gallery, $_zp_current_album, $_zp_current_image, $_zp_current_zenpage_page, $_zp_current_zenpage_news;
    $label = array('albums' => gettext('Albums'), 'images' => gettext('Images'), 'news' => gettext('News'), 'pages' => gettext('Pages'));
    $result = getRelatedItems($type, $specific);
    $resultcount = count($result);
    if ($resultcount != 0) {
        ?>
        <h3 class="relateditems">
            <?php printf(gettext('Related %s'), $type); ?>
        </h3>
        <ul id="relateditems">
            <?php
            $count = 0;
            foreach ($result as $item) {
                $count++;
                ?>
                <li class="<?php echo $item['type']; ?>">
                    <?php
                    $category = '';
                    switch ($item['type']) {
                        case 'albums':
                            $obj = newAlbum($item['name']);
                            $url = $obj->getLink();
                            $text = $obj->getDesc();
                            $category = gettext('Album');
                            break;
                        case 'images':
                            $alb = newAlbum($item['album']);
                            $obj = newImage($alb, $item['name']);
                            $url = $obj->getLink();
                            $text = $obj->getDesc();
                            $category = gettext('Image');
                            break;
                        case 'news':
                            $obj = new ZenpageNews($item['name']);
                            $url = $obj->getLink();
                            $text = $obj->getContent();
                            $category = gettext('News');
                            break;
                        case 'pages':
                            $obj = new ZenpagePage($item['name']);
                            $url = $obj->getLink();
                            $text = $obj->getContent();
                            $category = gettext('Page');
                            break;
                    }
                    ?>
                    <?php
                    if ($thumb) {
                        $thumburl = false;
                        switch ($item['type']) {
                            case 'albums':
                                $thumburl = $obj->getThumb();
                                break;
                            case 'images':
                                $thumburl = $obj->getThumb();
                                break;
                        }
                        if ($thumburl) {
                            ?>
                            <a href="<?php echo html_encode(pathurlencode($url)); ?>" title="<?php echo html_encode($obj->getTitle()); ?>" class="relateditems_thumb">
                                <img src="<?php echo html_encode(pathurlencode($thumburl)); ?>" alt="<?php echo html_encode($obj->getTitle()); ?>" />
                            </a>
                            <?php
                        }
                    }
                    ?>
                    <h4><a href="<?php echo html_encode(pathurlencode($url)); ?>" title="<?php echo html_encode($obj->getTitle()); ?>"><?php echo html_encode($obj->getTitle()); ?></a>
                        <?php
                        if ($date) {
                            switch ($item['type']) {
                                case 'albums':
                                case 'images':
                                    $d = $obj->getDateTime();
                                    break;
                                case 'news':
                                case 'pages':
                                    $d = $obj->getDateTime();
                                    break;
                            }
                            ?>
                            <span class="relateditems_date">
                                <?php echo zpFormattedDate(DATE_FORMAT, strtotime($d)); ?>
                            </span>
                            <?php
                        }
                        ?>
                        <?php if ($type == 'all') { ?> (<small><?php echo $category; ?></small>)<?php } ?>

                    </h4>
                    <?php
                    if ($excerpt) {
                        echo shortenContent($text, $excerpt, '...', true);
                    }
                    ?>
                </li>
                <?php
                if ($count == $number) {
                    break;
                }
            } // foreach
            if ($count) {
                ?>
            </ul>
            <?php
        }
    }
}
?>