<?php

class apop_activate {

	public static function add_sort_posts() {

		$categories = get_categories();
		foreach ( $categories as $category ) {
			$posts = self::get_category_posts( $category->term_id );
			foreach ( $posts as $post ) {
				self::create_sort_field( $post->ID, $category->term_id );
			}
		}
	}

	//カテゴリーの投稿を取得する
	public static function get_category_posts( $cat_id ) {
		$args = array(
			'post_status'    => array( 'publish', 'draft' ),
			'posts_per_page' => - 1,
			'category'       => $cat_id,
		);

		return get_posts( $args );
	}

	/**
	 * ソート用のカスタムフィールド作成
	 *
	 * @param $post_id
	 * @param $cat_id
	 */
	public static function create_sort_field( $post_id, $cat_id ) {
		$sort_key = '_apop_post_sort_' . $cat_id;
		//カスタムフィールドが存在しなければ追加する
		$sort_filed = get_post_meta( $post_id, $sort_key, true );
		if ( empty( $sort_filed ) ) {
			update_post_meta( $post_id, $sort_key, 0 );
		}
	}

}