File elements/taxonomy-filter.php

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<?php

namespace SIW\Elements;

/**
 * Taxonomy-filter voor archiefpagina's
 * 
 * @copyright 2019 SIW Internationale Vrijwilligersprojecten
 * @since     3.0.0
 */
class Taxonomy_Filter {

    /**
     * Versienummer
     */
    const ISOTOPE_VERSION = '3.0.6';

    /**
     * Constructor
     */
    public function __construct() {
        add_action( 'wp_enqueue_scripts', [ $this, 'enqueue_script' ] );
    }

    /**
     * Voegt script toe
     * 
     * @todo na switch theme script aanpassen
     */
    public function enqueue_script(){
        wp_register_script( 'siw-taxonomy-filter', SIW_ASSETS_URL . 'js/elements/siw-taxonomy-filter.js', [], SIW_PLUGIN_VERSION, true );
        wp_enqueue_script( 'siw-taxonomy-filter' );
    }

    /**
     * Genereert groep filterknoppen voor één taxonomy
     *
     * @param string $taxonomy
     * @return string
     */
    public function generate( string $taxonomy ) {
        $terms = $this->get_terms( $taxonomy );
        $name = 'continent';
        $output = sprintf( '<div class="filter-button-group" data-filter-group="%s">', $taxonomy );
        $output .= '<h5>' . sprintf( esc_html__( 'Filter op %s', 'siw' ), $name ) . '</h5>';
        $output .= sprintf ( '<button class="kad-btn is-checked" data-filter="">%s</button>', esc_html__( 'Alle', 'siw' ) );
        foreach ( $terms as $term ) {
            $output .= sprintf( '<button class="kad-btn" data-filter=".%s">%s</button>', esc_attr( $term->slug ), esc_html( $term->name ) );
        }
        $output .= '</div>';
        return $output;
    }

    /**
     * Haalt terms van één taxonomy op
     * 
     * @return array
     */
    protected function get_terms( string $taxonomy ) {
        $terms = get_terms( [
            'taxonomy'   => $taxonomy,
            'hide_empty' => true,
        ] );
        return $terms;
    }
}

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