タクソノミーをカスタムフィールドの日付を参照して自動設定する。イベント系の奴に使える。

Auto_Terms_By_Date.php

<?php
/**
 * Created by PhpStorm.
 * User: torounit
 * Date: 15/03/06
 * Time: 11:03
 *
 * Taxonomy Decorator.
 */

namespace Torounit\WP\Auto_Terms_By_Date;
use Torounit\WP\Taxonomy;

/**
 * Class State
 */
class Auto_Terms_By_Date {

    /** @var Taxonomy $taxonomy */
    private $taxonomy;
    private $end_key;

    private $open = 'open';

    private $terms_cache = [];

    private $closed = 'closed';



    /**
     * @param Taxonomy $taxonomy
     * @param String $key
     */
    public function __construct( Taxonomy $taxonomy, $start_key, $end_key = null ) {
        $this->taxonomy = $taxonomy;
        $this->start_key = $start_key;
        $this->end_key = $end_key;

        if ( ! $end_key ) {
            $this->end_key = $start_key;
        }

        $this->set_terms();
        $this->init();
    }


    /**
     * add closed term.
     */
    public function set_terms() {
        $this->taxonomy->add_default_term( 'アーカイブ' , $this->closed );
        $this->taxonomy->add_default_term( '公開中' , $this->open );
    }

    /**
     * execution.
     */
    public function init() {
        add_action( 'update_option_'.Config::UPDATED_OPTION, [$this, 'set_status_to_posts'] );
        add_action( 'save_post', [$this,'on_save_post'], 999, 2);
    }



    /**
     * @return array
     */
    public function get_posts() {
        $tax = get_taxonomy($this->taxonomy->get_taxonomy());
        $args = [
            'post_type' => $tax->object_type,
            'nopaging'  => true,
        ];
        return get_posts( $args );
    }


    /**
     * @param \WP_Post $post
     * @return bool
     */
    public function is_closed( \WP_Post $post ) {

        $post_dates = get_post_meta( $post->ID, $this->end_key, false );
        if( empty( $post_dates ) ) {
            return false;
        }
        $post_date_numbers = $this->remove_hyphen_from_dates( $post_dates );
        $last_date = max( $post_date_numbers );
        $date = intval( date( 'Ymd',  current_time('timestamp') ) );
        return ($last_date < $date);
    }

    /**
     * @param \WP_Post $post
     * @return bool
     */
    public function is_open( \WP_Post $post ) {

        $post_dates = get_post_meta( $post->ID, $this->start_key, false );
        if( empty( $post_dates ) ) {
            return false;
        }
        
        $post_date_numbers = $this->remove_hyphen_from_dates( $post_dates );
        $
        $first_date = min( $post_date_numbers );
        $date = intval( date( 'Ymd',  current_time('timestamp') ) );
        return  ( $first_date <= $date);
    }

    /**
     * @param Array $post_dates
     * @return Array
     */
    public function remove_hyphen_from_dates( $post_dates ) {
        return array_map( function( $post_date ) {
            return intval( str_replace('-','', $post_date) );
        }, $post_dates );
    }


    /**
     * @param $id
     * @param \WP_Post $post
     */
    public function on_save_post( $id, \WP_Post $post ) {
        $this->set_term( $post );
    }


    /**
     * @param string $term_slug
     * @return mixed
     */
    public function get_term_by_slug( $term_slug ) {

        if( !empty( $this->terms_cache[ $term_slug ] ) ) {
            return $this->terms_cache[ $term_slug ];
        }
        else {
            $term = get_term_by('slug', $term_slug, $this->taxonomy->get_taxonomy() );
            $this->terms_cache[ $term_slug ] = $term;
            return $term;
        }

    }


    /**
     * @param \WP_Post $post
     */
    public function set_term( \WP_Post $post ) {

        if( $this->is_closed( $post ) ) {
            $term = $this->get_term_by_slug( $this->closed );
            wp_set_object_terms( $post->ID, $term->slug, $this->taxonomy->get_taxonomy() );
        }
        elseif( $this->is_open( $post ) ) {
            $term = $this->get_term_by_slug( $this->open );
            wp_set_object_terms( $post->ID, $term->slug, $this->taxonomy->get_taxonomy() );
        }
        else {
            wp_delete_object_term_relationships( $post->ID, $this->taxonomy->get_taxonomy());
        }

    }

    /**
     * 抽出した投稿に
     * タクソノミーを設定
     */
    public function set_status_to_posts() {
        array_walk( $this->get_posts(), function( $post ){
            $this->set_term( $post );
        });
    }

}