File elements/carousel.php

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<?php

namespace SIW\Elements;

use SIW\CSS;

/**
 * Carousel met posts
 * 
 * @copyright 2019 SIW Internationale Vrijwilligersprojecten
 * @since     3.0.0
 */
class Carousel {

    /**
     * Versienummer 
     */
    const FLICKITY_VERSION = '2.2.1';

    /**
     * Post type
     *
     * @var string
     */
    protected $post_type;

    /**
     * Taxonomy voor query
     *
     * @var string
     */
    protected $taxonomy;

    /**
     * Term voor query
     *
     * @var string
     */
    protected $term;

    /**
     * Aantal items in carousel
     *
     * @var int
     */
    protected $items = 6;

    /**
     * Aantal kolommen in carousel
     *
     * @var int
     */
    protected $columns = 4;

    /**
     * Tekst voor knop
     *
     * @var string
     */
    protected $button_text;

    /**
     * Opties voor carousel
     *
     * @var array
     */
    protected $options = [
        'cellAlign'  => 'left',
        'contain'    => true,
        'wrapAround' => true,
        'autoPlay'   => 2000,
        'pageDots'   => false,
    ];

    /**
     * Voegt stylesheet toe
     */
    public function enqueue_styles() {
        wp_register_style( 'flickity', SIW_ASSETS_URL . 'modules/flickity/flickity.css', [], self::FLICKITY_VERSION );
        wp_enqueue_style( 'flickity' );
    }

    /**
     * Voegt scripts toe
     */
    public function enqueue_scripts() {
        wp_register_script( 'flickity', SIW_ASSETS_URL . 'modules/flickity/flickity.js', [], self::FLICKITY_VERSION, true );
        wp_enqueue_script( 'flickity' );
    }

    /**
     * Haalt responsive classes op
     * 
     * @return string
     */
    protected function get_responsive_class() {
        switch ( $this->columns ) {
            case 1:
                $column_size = 12;
                $tablet_size = 12;
                $mobile_size = 12;
                break;
            case 2:
                $column_size = 6;
                $tablet_size = 6;
                $mobile_size = 12;
                break;
            case 3:
                $column_size = 4;
                $tablet_size = 6;
                $mobile_size = 12;
                break;
            case 4:
                $column_size = 3;
                $tablet_size = 6;
                $mobile_size = 12;
                break;
            default:
                $column_size = 12;
                $tablet_size = 12;
                $mobile_size = 12;
        }
        $class = CSS::generate_responsive_class( $column_size, $tablet_size, $mobile_size );
        return $class;
    }


    /**
     * Zet post type voor carousel
     *
     * @param string $post_type
     */
    public function set_post_type( string $post_type ) {
        $this->post_type = $post_type;
    }

    /**
     * Zet aantal items van carousel
     *
     * @param int $items
     */
    public function set_items( int $items ) {
        $this->items = $items;
    }

    /**
     * Zet aantal kolommen van carousel
     *
     * @param int $columns
     */
    public function set_columns( int $columns ) {
        $this->columns = $columns;
    }

    /**
     * Zet taxonomy en term voor carousel
     *
     * @param string $taxonomy
     * @param string $term
     */
    public function set_taxonomy_term( string $taxonomy, string $term ) {
        $this->taxonomy = $taxonomy;
        $this->term = $term;
    }

    /**
     * Zet opties voor carousel
     *
     * @param array $options
     */
    public function set_options( array $options ) {
        $this->options = wp_parse_args( $options, $this->options );
    }

    /**
     * Genereert carousel
     * 
     * @return string
     * 
     * @todo leesbaarder maken
     */
    public function render() {
        
        $this->enqueue_scripts();
        $this->enqueue_styles();

        $query = $this->generate_query();

        //Lelijkheid ten top, kan hopelijk weg na switch theme
        global $woocommerce_loop;
        $columns = $woocommerce_loop['columns'];
        $woocommerce_loop['columns'] = 1;

        ob_start();
        ?>
        <div class="siw-carousel">
        <?php
        if ( $query->have_posts() ) {
            ?>
            <div class="main-carousel" data-flickity='<?php echo json_encode( $this->options );?>'>
            <?php
            while ( $query->have_posts() ) {
                $query->the_post();
                global $post; //Kan weg na switch naar GeneratePress
                ?> <div class="<?php echo esc_attr( $this->get_responsive_class() );?> carousel-cell">
                    <?php include( $this->get_template() );?>
                </div>
                <?php
            }
            echo '</div>';
        } else {
            //TODO: tekst bij geen posts? -> Instelling
        }

        echo '</div>';

        wp_reset_postdata();

        //Ongedaan maken lelijkheid, kan hopelijk weg na switch theme
        $woocommerce_loop['columns'] = $columns;
        return ob_get_clean();
    }

    /**
     * Genereert query
     * 
     * @return \WP_Query
     */
    protected function generate_query() {
        $args = [
            'post_type'      => $this->post_type,
            'posts_per_page' => $this->items,
            'orderby'        => 'rand',
        ];

        if ( isset( $this->taxonomy ) && isset( $this->term ) ) {
            $args['tax_query'] = [
                [
                    'taxonomy'         => $this->taxonomy,
                    'terms'            => $this->term,
                    'field'            => 'slug',
                ],
            ];
        }

        //In het geval van Groepsprojecten alleen zichtbare projecten tonen (tenzij er al op product_visibility gefilterd wordt)
        if ( 'product' == $this->post_type && 'product_visibility' != $this->taxonomy ) {
            $args['tax_query'][] = [
                'taxonomy' => 'product_visibility',
                'terms'    => [ 'exclude-from-search', 'exclude-from-catalog'],
                'field'    => 'slug',
                'operator' => 'NOT IN'
            ];
        }

        return new \WP_Query( $args );
    }

    /**
     * Haal templatebestand op voor post type
     * 
     * @return string
     */
    protected function get_template() {
        //TODO:filter

        $templates = [
            'siw_tm_country' => SIW_TEMPLATES_DIR . '/content-tm_country.php',
            'product'        => wc_locate_template('content-product.php' ),
        ];

        $template = $templates[ $this->post_type ] ?? '';
        return $template;
    }
}

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