File batch/update-taxonomies.php

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<?php

namespace SIW\Batch;

use SIW\Formatting;
use SIW\Batch\Delete_Workcamps;

/**
 * Proces om taxonomieën bij te werken
 *
 * - Naam bijwerken
 * - Lege terms verwijderen
 * - Volgorde bijwerken
 * 
 * @copyright 2019 SIW Internationale Vrijwilligersprojecten
 * @since     3.0.0
 */
class Update_Taxonomies extends Job {

    /**
     * {@inheritDoc}
     */
    protected $action = 'update_taxonomies';

    /**
     * {@inheritDoc}
     */
    protected $name = 'bijwerken taxonomies';

    /**
     * {@inheritDoc}
     */
    protected $category = 'algemeen';

    /**
     * Selecteer de terms van de relevante taxonomieën
     *
     * @return array
     * 
     * @todo delete_empty_term optie
     */
    protected function select_data() {

        $taxonomies = [
            'pa_maand',
            'pa_land',
            'pa_taal',
            'pa_soort-werk',
            'pa_doelgroep',
            'product_tag'
        ];
        
        foreach ( $taxonomies as $taxonomy ) {
            if ( ! taxonomy_exists( $taxonomy ) ) {
                continue;
            }

            $terms = get_terms( [
                'taxonomy'   => $taxonomy,
                'hide_empty' => false,
            ] );
            foreach ( $terms as $term ) {
                $data[] = [
                    'taxonomy'  => $taxonomy,
                    'term_slug' => $term->slug
                ];
            }
        }
        return $data;
    }

    /**
     * Bijwerken term
     *
     * @param array $item
     *
     * @return mixed
     */
    protected function task( $item ) {

        $taxonomy = $item['taxonomy'];
        $term_slug = $item['term_slug'];

        $term = get_term_by( 'slug', $term_slug, $taxonomy );

        if ( ! is_a( $term, 'WP_Term') ) {
            return false;
        }

        $tax_query = [
            [
                'taxonomy' => $taxonomy,
                'field'    => 'slug',
                'terms'    => $term_slug,
            ],
        ];
        $products = wc_get_products(
            [
                'limit'      => -1,
                'return'     => 'ids',
                'tax_query'  => $tax_query,
            ]
        );
        $term_count = count( $products );

        if ( 0 === $term_count ) {
            wp_delete_term( $term->term_id, $taxonomy );
            $this->increment_processed_count();
            return false;
        }
        
        /* Naam bijwerken indien nodig */
        $term_name = $this->get_term_name( $taxonomy, $term_slug );
        if ( null != $term_name && $term->name != $term_name ) {
            wp_update_term(
                $term->term_id,
                $taxonomy,
                [ 'name' => $term_name ]
            );
        }

        /* Volgorde bijwerken van toepassing */
        $term_order = $this->get_term_order( $taxonomy, $term_slug );
        if ( null != $term_order ) {
            update_term_meta( $term->term_id, 'order', $term_order ); 
        }

        $this->increment_processed_count();
        return false;
    }

    /**
     * Geeft naam van term terug o.b.v. reference data
     *
     * @param string $taxonomy
     * @param string $term_slug
     * 
     * @return string
     * 
     * @todo doelgroep en product_tag
     */
    protected function get_term_name( $taxonomy, $term_slug ) {
        switch ( $taxonomy ) {
            case 'pa_maand':
                $months = $this->get_months();
                if ( array_key_exists( $term_slug, $months ) ) {
                    $name = $months[ $term_slug ]['name'];
                }
                else {
                    $name = null;
                }
                break;

            case 'pa_land':
                $country = siw_get_country( $term_slug );
                $name = $country ? $country->get_name() : null;
                break;

            case 'pa_soort-werk':
                $work_type = siw_get_work_type( $term_slug );
                $name = $work_type ? $work_type->get_name() : null;
                break;

            case 'pa_taal':
                $language = siw_get_language( $term_slug );
                $name = $language ? $language->get_name() : null;
                break;

            case 'pa_doelgroep':
                $name = null;
                break;

            case 'product_tag':
                $name = null;
                break;

            default:
                $name = null;
        }

        return $name;
    }

    /**
     * Geeft volgorde van term terug
     *
     * @param string $taxonomy
     * @param string $term_slug
     * @return string
     */
    protected function get_term_order( $taxonomy, $term_slug ) {
        switch ( $taxonomy ) {
            case 'pa_maand':
                $months = $this->get_months();
                if ( array_key_exists( $term_slug, $months ) ) {
                    $order = $months[ $term_slug ]['order'];
                }
                else {
                    $order = null;
                }
                break;

            default:
                $order = null;
        }
        return $order;
    }

    /**
     * Geeft informatie over maanden terug
     * 
     * @return array
     * @todo grenzen echt gebruiken
     */
    protected function get_months() {
        $max_months_in_past = Delete_Workcamps::MAX_AGE_WORKCAMP;
        $max_months_in_future = 18; //TODO: constante

        $current_year = $current_year = date( 'Y' );

        for ( $i = -6 ; $i <= 18; $i++) {
            $date = date( 'Y-m-d', strtotime( date( 'Y-m-01' ) . "+{$i} months" ));
            $year = date( 'Y', strtotime( $date ) );
            $month = Formatting::format_month( $date, true );
            $slug = sanitize_title( $month );
            $months[ $slug ] =[
                'name'  => ucfirst( Formatting::format_month( $date, ( $year != $current_year ) ) ),
                'order' => date( 'Ym', strtotime( $date ) ),
            ];
        }
        return $months;
    }
}

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