<?php

namespace ILJ\Backend;

use ILJ\Database\Postmeta;

/**
 * Listview columns
 *
 * Responsible for adding information to listview columns (posts, taxonomies)
 *
 * @package ILJ\Backend
 *
 * @since 1.1.3
 */
class Column {


	const ILJ_COLUMN_CONFIGURED_LINKS = 'ilj_column_configured_links';

	/**
	 * Returns the title for the configured links column in the frontend
	 *
	 * @return string
	 * @since  1.1.3
	 */
	protected static function getConfiguredLinksColumnTitle() {
		 return __('Configured keywords for internal linking', 'internal-links');
	}

	/**
	 * Generates and adds all possible configured links columns
	 *
	 * @return void
	 * @since  1.1.3
	 */
	public static function addConfiguredLinksColumn() {
		 $types = get_post_types(array('public' => true));

		

		foreach ($types as $type) {
			add_action(
				'manage_' . $type . '_posts_custom_column',
				array(
					'\ILJ\Backend\Column',
					'addConfiguredLinksColumnContent',
				),
				5,
				2
			);
			add_filter(
				'manage_' . $type . '_posts_columns',
				array(
					'\ILJ\Backend\Column',
					'addConfiguredLinksColumnHeader',
				)
			);
			add_filter(
				'manage_edit-' . $type . '_sortable_columns',
				array(
					'\ILJ\Backend\Column',
					'addConfiguredLinksColumnSorter',
				)
			);
			add_filter('wp', array('\ILJ\Backend\Column', 'sortConfiguredLinksColumn'));
		}
	}

	/**
	 * Adds the configured links column header
	 *
	 * @param array $columns All columns header
	 *
	 * @return array
	 * @since  1.1.3
	 */
	public static function addConfiguredLinksColumnHeader($columns) {
		\ILJ\Helper\Loader::enqueue_style('ilj_ui', ILJ_URL . 'admin/css/ilj_ui.css', array(), ILJ_VERSION);

		$columns[self::ILJ_COLUMN_CONFIGURED_LINKS] = '<span class="icon icon-ilj" title="' . self::getConfiguredLinksColumnTitle() . '"></span><span class="screen-reader-text">' . self::getConfiguredLinksColumnTitle() . '</span>';

		return $columns;
	}

	/**
	 * Outputs the content of the configured links column
	 *
	 * @param string $column  The current column
	 * @param int    $post_id Post ID
	 *
	 * @return void
	 * @since  1.1.3
	 */
	public static function addConfiguredLinksColumnContent($column, $post_id) {
		if (self::ILJ_COLUMN_CONFIGURED_LINKS === $column) {
			$data = get_post_meta($post_id, Postmeta::ILJ_META_KEY_LINKDEFINITION);

			if (!is_array($data) && !is_object($data)) {
				echo '0';
				return;
			}

			if (empty($data) || (is_array($data) && !is_array($data[0]))) {
				echo '0';
				return;
			}
			echo count($data[0]);
		}
	}

	/**
	 * Adds the sorter to the configured links column
	 *
	 * @param array $columns All sortable columns
	 *
	 * @return array
	 * @since  1.1.3
	 */
	public static function addConfiguredLinksColumnSorter($columns) {
		 $columns[self::ILJ_COLUMN_CONFIGURED_LINKS] = self::ILJ_COLUMN_CONFIGURED_LINKS;

		return $columns;
	}

	/**
	 * Adds the post sorting logic for configured links column
	 *
	 * @return void
	 * @since  1.1.3
	 */
	public static function sortConfiguredLinksColumn() {
		global $wp_query;

		if (!is_admin()) {
			return;
		}

		$orderby = $wp_query->get('orderby');

		if (self::ILJ_COLUMN_CONFIGURED_LINKS != $orderby) {
			return;
		}

		$page_offset    = ($wp_query->query_vars['paged']) ? $wp_query->query_vars['paged'] : 1;
		$posts_per_page = $wp_query->query_vars['posts_per_page'];
		$order          = isset($wp_query->query_vars) && isset($wp_query->query_vars['order']) && strcasecmp($wp_query->query_vars['order'], 'desc') == 0 ? 'DESC' : 'ASC';

		$args                   = $wp_query->query;
		$args['posts_per_page'] = -1;

		$new_query = new \WP_Query($args);
		$posts     = $new_query->posts;

		usort(
			$posts,
			function ($a, $b) use ($order) {
				$keywords_a    = get_post_meta($a->ID, Postmeta::ILJ_META_KEY_LINKDEFINITION);
				$keywords_b    = get_post_meta($b->ID, Postmeta::ILJ_META_KEY_LINKDEFINITION);
				$count_a       = count($keywords_a) ? count($keywords_a[0]) : 0;
				$count_b       = count($keywords_b) ? count($keywords_b[0]) : 0;
				$sorting_value = ('DESC' == $order ? ($count_a > $count_b) : ($count_a < $count_b)) ? - 1 : ($count_a == $count_b ? 0 : 1);

				return $sorting_value;
			}
		);

		$sliced          = array_slice($posts, ($page_offset - 1) * $posts_per_page, $posts_per_page);
		$wp_query->posts = $sliced;
	}

	
}