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    <?php

    namespace WPGMZA;

    class Category
    {
        public static function doesMarkersHasCategoriesTableExist()
        {
            global $wpdb;
            global $WPGMZA_TABLE_NAME_MARKERS_HAS_CATEGORIES;

            $stmt = $wpdb->prepare("SHOW TABLES LIKE %s", array($WPGMZA_TABLE_NAME_MARKERS_HAS_CATEGORIES));
            $table = $wpdb->get_var($stmt);

            return ($table ? true : false);
        }

        public static function installMarkerHasCategoriesTable()
        {
            global $wpdb;
            global $WPGMZA_TABLE_NAME_MARKERS_HAS_CATEGORIES;

            if(Category::doesMarkersHasCategoriesTableExist())
                return;

            $wpdb->query("CREATE TABLE `$WPGMZA_TABLE_NAME_MARKERS_HAS_CATEGORIES` (
                    marker_id int(11) NOT NULL,
                    category_id int(11) NOT NULL,
                    PRIMARY KEY  (marker_id, category_id)
                ) ENGINE=InnoDB DEFAULT CHARSET=utf8;
            ");
        }

        /**
         * This function completely rebuilds the markers-has-categories table
         * from the legacy marker "category" field
         */
        public static function rebuildTableFromLegacyField($options=null)
        {
            global $wpdb;
            global $wpgmza_tblname;
            global $WPGMZA_TABLE_NAME_CATEGORIES;
            global $WPGMZA_TABLE_NAME_MARKERS_HAS_CATEGORIES;

            Category::installMarkerHasCategoriesTable();

            if(!$options)
                $options = array();

            $map_id = null;
            $marker_id = null;

            if(!empty($options['map']))
                $map_id = $options['map']->id;

            if(!empty($options['marker']))
                $marker_id = $options['marker']->id;

            if(!empty($options['marker_id']))
                $marker_id = $options['marker_id'];

            // Delete old relationships
            if($map_id)
                $where = " WHERE marker_id IN (SELECT id FROM $wpgmza_tblname WHERE map_id=" . (int)$map_id . ")";
            else if($marker_id)
                $where = " WHERE marker_id=" . (int)$marker_id;
            else
                $where = "";

            $qstr = "DELETE FROM $WPGMZA_TABLE_NAME_MARKERS_HAS_CATEGORIES $where";

            $wpdb->query($qstr);

            // Rebuild relationships
            if($map_id)
                $where = " WHERE map_id=" . (int)$map_id;
            else if($marker_id)
                $where = " WHERE id=" . (int)$marker_id;

            $qstr = "SELECT id, category FROM $wpgmza_tblname $where";

            $markers = $wpdb->get_results($qstr);

            foreach($markers as $marker)
            {
                if(empty($marker->category))
                    continue;

                $categories = explode(',', $marker->category);

                foreach($categories as $category_id)
                {
                    if(array_search($category_id, $categories) === false)
                        continue;

                    $qstr = "INSERT INTO $WPGMZA_TABLE_NAME_MARKERS_HAS_CATEGORIES (marker_id, category_id) VALUES (%d, %d)";

                    $stmt = $wpdb->prepare($qstr, array($marker->id, $category_id));

                    $wpdb->query($stmt);
                }
            }
        }
    }

    add_action('init', function() {
        // First time, for upgrading users and new users
        if(!Category::doesMarkersHasCategoriesTableExist())
            Category::rebuildTableFromLegacyField();
    }, 100);

    add_action('wpgmza_marker_saved', function($marker) {
        Category::rebuildTableFromLegacyField(array(
            'marker' => $marker
        ));
    });

    add_action('wpgmza_marker_deleted', function($marker_id) {
        Category::rebuildTableFromLegacyField(array(
            'marker_id' => $marker_id
        ));
    });

    add_action('wpgmza_categories_saved',   array('WPGMZA\\Category', 'rebuildTableFromLegacyField'));
    add_action('wpgmza_category_deleted',   array('WPGMZA\\Category', 'rebuildTableFromLegacyField'));
    add_action('wpgmza_import_complete',    array('WPGMZA\\Category', 'rebuildTableFromLegacyField'));