<?php
/**
Plugin Name: NextGen 2.0 Search engine 
Description: Add a search function for the images of NextGEN Gallery
Author: Alex Rabe
Version: 0.8.0
Author URI: http://alexrabe.de/
Plugin URI: http://alexrabe.de/

Copyright (C) 2010 - 2011 Alex Rabe
@package NextGEN Gallery
**/ 

/** Please refer to http://alexrabe.de/2010/01/13/search-for-images/ for code snippet for integration into search.php **/

class nggSearchEngine {

	var $search_result = false;
	var $found_images = false;
	var $out = false;

	function nggSearchEngine() {
		return $this->__construct();
	}

    function __construct() {
    	
    	// no NextGEN Gallery, no addon
    	if (!class_exists('nggGallery') ) 
			return;
			 
    	add_action('parse_request',  array(&$this, 'search_query') );
        add_action('ngg_get_permalink',  array(&$this, 'create_pagination') , 10, 2 );   
   	}

	/**
	 * Main search for images
	 *
	 * @return void
	 **/
	function search_query( $wp ) {
		global $nggdb;

		if ( array_key_exists('s', $wp->query_vars) && !empty($wp->query_vars['s']) ) {

		 	$this->search_result = array_merge( (array) $nggdb->search_for_images( $wp->query_vars['s'] ), (array) nggTags::find_images_for_tags( $wp->query_vars['s'] , 'ASC' ));

			if ( !empty($this->search_result) )
				$this->found_images = true;
				
		}

	}
   	
	/**
	 * Return the output
	 *
	 * @return $output HTML content
	 **/
	function return_result( $template = '') {
	
		if ( $this->found_images )
        	$this->out = nggCreateGallery($this->search_result, false, $template);

		$this->out = apply_filters('ngg_show_search_result', $this->out);	
		
		return $this->out;
	}
    
    /**
     * Modify the pagination for search results
     * 
     * @param string $url
     * @param string $args
     * @return void
     */
    function create_pagination( $url, $args = '') {
        global $wp_rewrite, $wp_query;
        
        $search = get_query_var('s');
        
        // we just look for search results 
        if ( !empty( $search ) ) {
            
            $url = htmlspecialchars( add_query_arg( $args ) );
            
        }
        
        return $url;
        
    }
}

// Start this plugin once all other plugins are fully loaded
add_action( 'plugins_loaded', create_function( '', 'global $nggSearch; $nggSearch = new nggSearchEngine();' ) );

/**
 * Template call for the frontend search, just use this code snippet in your theme template 
 * <?php if ( function_exists( 'ngg_images_results' ) ) ngg_images_results(); ?>
 * 
 * @param string $template if you would like to show the result with a differentlayout, just take a template 
 * @return search output
 */
function ngg_images_results( $template = '') {
	global $nggSearch;

	echo $nggSearch->return_result( $template );  	
}

function have_images() {
	global $nggSearch;
	
	return $nggSearch->found_images; 
}

function nggCreateGallery($picturelist, $galleryID = false, $template = '', $images = false) {
    global $nggRewrite;
    if (class_exists("nggRewrite")) $nggRewrite=new nggRewrite();

    $ngg_options = nggGallery::get_option('ngg_options');

    //the shortcode parameter will override global settings, TODO: rewrite this to a class
    $ngg_options['galImages'] = ( $images === false ) ? $ngg_options['galImages'] : (int) $images;

    $current_pid = false;

    // $_GET from wp_query
    $nggpage  = get_query_var('nggpage');
    $pageid   = get_query_var('pageid');
    $pid      = get_query_var('pid');

    // in case of permalinks the pid is a slug, we need the id
    if( !is_numeric($pid) && !empty($pid) ) {
        $picture = nggdb::find_image($pid);
        $pid = $picture->pid;
    }

    // we need to know the current page id
    $current_page = (get_the_ID() == false) ? 0 : get_the_ID();

    if ( !is_array($picturelist) )
        $picturelist = array($picturelist);

    // Populate galleries values from the first image
    $first_image = current($picturelist);
    $gallery = new stdclass;
    $gallery->ID = (int) $galleryID;
    $gallery->show_slideshow = false;
    $gallery->show_piclens = false;
    $gallery->name = stripslashes ( $first_image->name  );
    $gallery->title = stripslashes( $first_image->title );
    $gallery->description = html_entity_decode(stripslashes( $first_image->galdesc));
    $gallery->pageid = $first_image->pageid;
    $gallery->anchor = 'ngg-gallery-' . $galleryID . '-' . $current_page;
    reset($picturelist);

    $maxElement  = $ngg_options['galImages'];
    $thumbwidth  = $ngg_options['thumbwidth'];
    $thumbheight = $ngg_options['thumbheight'];

    // fixed width if needed
    $gallery->columns    = intval($ngg_options['galColumns']);
    $gallery->imagewidth = ($gallery->columns > 0) ? 'style="width:' . floor(100/$gallery->columns) . '%;"' : '';

    // obsolete in V1.4.0, but kept for compat reason
	// pre set thumbnail size, from the option, later we look for meta data.
    $thumbsize = ($ngg_options['thumbfix']) ? $thumbsize = 'width="' . $thumbwidth . '" height="'.$thumbheight . '"' : '';

    // show slideshow link
    if ($galleryID) {
        if ($ngg_options['galShowSlide']) {
            $gallery->show_slideshow = true;
            $gallery->slideshow_link = $nggRewrite->get_permalink(array ( 'show' => 'slide') );
            $gallery->slideshow_link_text = nggGallery::i18n($ngg_options['galTextSlide']);
        }

        if ($ngg_options['usePicLens']) {
            $gallery->show_piclens = true;
            $gallery->piclens_link = "javascript:PicLensLite.start({feedUrl:'" . htmlspecialchars( nggMediaRss::get_gallery_mrss_url($gallery->ID) ) . "'});";
        }
    }

    // check for page navigation
    if ($maxElement > 0) {

        if ( !is_home() || $pageid == $current_page )
            $page = ( !empty( $nggpage ) ) ? (int) $nggpage : 1;
        else
            $page = 1;

        $start = $offset = ( $page - 1 ) * $maxElement;

        $total = count($picturelist);

		//we can work with display:hidden for some javascript effects
        if (!$ngg_options['galHiddenImg']){
	        // remove the element if we didn't start at the beginning
	        if ($start > 0 )
	            array_splice($picturelist, 0, $start);

	        // return the list of images we need
	        array_splice($picturelist, $maxElement);
        }

        $nggNav = new nggNavigation;
        $navigation = $nggNav->create_navigation($page, $total, $maxElement);
    } else {
        $navigation = '<div class="ngg-clear"></div>';
    }

    //we cannot use the key as index, cause it's filled with the pid
	$index = 0;
    foreach ($picturelist as $key => $picture) {

		//needed for hidden images (THX to Sweigold for the main idea at : http://wordpress.org/support/topic/228743/ )
		$picturelist[$key]->hidden = false;
		$picturelist[$key]->style  = $gallery->imagewidth;

		if ($maxElement > 0 && $ngg_options['galHiddenImg']) {
	  		if ( ($index < $start) || ($index > ($start + $maxElement -1)) ){
				$picturelist[$key]->hidden = true;
				$picturelist[$key]->style  = ($gallery->columns > 0) ? 'style="width:' . floor(100/$gallery->columns) . '%;display: none;"' : 'style="display: none;"';
			}
  			$index++;
		}

        // get the effect code
        /*if ($galleryID)
            $thumbcode = ($ngg_options['galImgBrowser']) ? '' : $picture->get_thumbcode('set_' . $galleryID);
        else
            $thumbcode = ($ngg_options['galImgBrowser']) ? '' : $picture->get_thumbcode(get_the_title());
        */
        // create link for imagebrowser and other effects
        $args ['nggpage'] = empty($nggpage) || ($template != 'carousel') ? false : $nggpage;  // only needed for carousel mode
        $args ['pid']     = ($ngg_options['usePermalinks']) ? $picture->image_slug : $picture->pid;
        $picturelist[$key]->pidlink = $nggRewrite->get_permalink( $args );

        // generate the thumbnail size if the meta data available
        if ( isset($picturelist[$key]->meta_data['thumbnail']) && is_array ($size = $picturelist[$key]->meta_data['thumbnail']) )
        	$thumbsize = 'width="' . $size['width'] . '" height="' . $size['height'] . '"';

        // choose link between imagebrowser or effect
        $link = ($ngg_options['galImgBrowser']) ? $picturelist[$key]->pidlink : $picture->imageURL;
        // bad solution : for now we need the url always for the carousel, should be reworked in the future
        $picturelist[$key]->url = $picture->imageURL;
        // add a filter for the link
        $picturelist[$key]->imageURL = apply_filters('ngg_create_gallery_link', $link, $picture);
        $picturelist[$key]->thumbnailURL = $picture->thumbURL;
        $picturelist[$key]->size = $thumbsize;
        $picturelist[$key]->thumbcode = $thumbcode;
        $picturelist[$key]->caption = ( empty($picture->description) ) ? '&nbsp;' : html_entity_decode ( stripslashes(nggGallery::i18n($picture->description, 'pic_' . $picture->pid . '_description')) );
        $picturelist[$key]->description = ( empty($picture->description) ) ? ' ' : htmlspecialchars ( stripslashes(nggGallery::i18n($picture->description, 'pic_' . $picture->pid . '_description')) );
        $picturelist[$key]->alttext = ( empty($picture->alttext) ) ?  ' ' : htmlspecialchars ( stripslashes(nggGallery::i18n($picture->alttext, 'pic_' . $picture->pid . '_alttext')) );

        // filter to add custom content for the output
        $picturelist[$key] = apply_filters('ngg_image_object', $picturelist[$key], $picture->pid);

        //check if $pid is in the array
        if ($picture->pid == $pid)
            $current_pid = $picturelist[$key];
    }
    reset($picturelist);

    //for paged galleries, take the first image in the array if it's not in the list
    $current_pid = ( empty($current_pid) ) ? current( $picturelist ) : $current_pid;

    // look for gallery-$template.php or pure gallery.php
    $filename = ( empty($template) ) ? 'gallery' : 'gallery-' . $template;

    //filter functions for custom addons
    $gallery     = apply_filters( 'ngg_gallery_object', $gallery, $galleryID );
    $picturelist = apply_filters( 'ngg_picturelist_object', $picturelist, $galleryID );

    //additional navigation links
    $next = ( empty($nggNav->next) ) ? false : $nggNav->next;
    $prev = ( empty($nggNav->prev) ) ? false : $nggNav->prev;

    // create the output
    $out = nggGallery::capture ( $filename, array ('gallery' => $gallery, 'images' => $picturelist, 'pagination' => $navigation, 'current' => $current_pid, 'next' => $next, 'prev' => $prev) );

    // apply a filter after the output
    $out = apply_filters('ngg_gallery_output', $out, $picturelist);

    return $out;
}

?>