<?php

/**

 * List Table API: WP_Terms_List_Table class

 *

 * @package WordPress

 * @subpackage Administration

 * @since 3.1.0

 */

/**

 * Core class used to implement displaying terms in a list table.

 *

 * @since 3.1.0

 * @access private

 *

 * @see WP_List_Table

 */

class WP_Terms_List_Table extends WP_List_Table {

	public $callback_args;

	private $level;

	/**

	 * Constructor.

	 *

	 * @since 3.1.0

	 *

	 * @see WP_List_Table::__construct() for more information on default arguments.

	 *

	 * @global string $post_type

	 * @global string $taxonomy

	 * @global string $action

	 * @global object $tax

	 *

	 * @param array $args An associative array of arguments.

	 */

	public function __construct( $args = array() ) {

		global $post_type, $taxonomy, $action, $tax;

		parent::__construct(

			array(

				'plural'   => 'tags',

				'singular' => 'tag',

				'screen'   => isset( $args['screen'] ) ? $args['screen'] : null,

			)

		);

		$action    = $this->screen->action;

		$post_type = $this->screen->post_type;

		$taxonomy  = $this->screen->taxonomy;

		if ( empty( $taxonomy ) ) {

			$taxonomy = 'post_tag';

		}

		if ( ! taxonomy_exists( $taxonomy ) ) {

			wp_die( __( 'Invalid taxonomy.' ) );

		}

		$tax = get_taxonomy( $taxonomy );

		// @todo Still needed? Maybe just the show_ui part.

		if ( empty( $post_type ) || ! in_array( $post_type, get_post_types( array( 'show_ui' => true ) ) ) ) {

			$post_type = 'post';

		}

	}

	/**

	 * @return bool

	 */

	public function ajax_user_can() {

		return current_user_can( get_taxonomy( $this->screen->taxonomy )->cap->manage_terms );

	}

	/**

	 */

	public function prepare_items() {

		$tags_per_page = $this->get_items_per_page( 'edit_' . $this->screen->taxonomy . '_per_page' );

		if ( 'post_tag' === $this->screen->taxonomy ) {

			/**

			 * Filters the number of terms displayed per page for the Tags list table.

			 *

			 * @since 2.8.0

			 *

			 * @param int $tags_per_page Number of tags to be displayed. Default 20.

			 */

			$tags_per_page = apply_filters( 'edit_tags_per_page', $tags_per_page );

			/**

			 * Filters the number of terms displayed per page for the Tags list table.

			 *

			 * @since 2.7.0

			 * @deprecated 2.8.0 Use edit_tags_per_page instead.

			 *

			 * @param int $tags_per_page Number of tags to be displayed. Default 20.

			 */

			$tags_per_page = apply_filters( 'tagsperpage', $tags_per_page );

		} elseif ( 'category' === $this->screen->taxonomy ) {

			/**

			 * Filters the number of terms displayed per page for the Categories list table.

			 *

			 * @since 2.8.0

			 *

			 * @param int $tags_per_page Number of categories to be displayed. Default 20.

			 */

			$tags_per_page = apply_filters( 'edit_categories_per_page', $tags_per_page );

		}

		$search = ! empty( $_REQUEST['s'] ) ? trim( wp_unslash( $_REQUEST['s'] ) ) : '';

		$args = array(

			'search' => $search,

			'page'   => $this->get_pagenum(),

			'number' => $tags_per_page,

		);

		if ( ! empty( $_REQUEST['orderby'] ) ) {

			$args['orderby'] = trim( wp_unslash( $_REQUEST['orderby'] ) );

		}

		if ( ! empty( $_REQUEST['order'] ) ) {

			$args['order'] = trim( wp_unslash( $_REQUEST['order'] ) );

		}

		$this->callback_args = $args;

		$this->set_pagination_args(

			array(

				'total_items' => wp_count_terms( $this->screen->taxonomy, compact( 'search' ) ),

				'per_page'    => $tags_per_page,

			)

		);

	}

	/**

	 * @return bool

	 */

	public function has_items() {

		// todo: populate $this->items in prepare_items()

		return true;

	}

	/**

	 */

	public function no_items() {

		echo get_taxonomy( $this->screen->taxonomy )->labels->not_found;

	}

	/**

	 * @return array

	 */

	protected function get_bulk_actions() {

		$actions = array();

		if ( current_user_can( get_taxonomy( $this->screen->taxonomy )->cap->delete_terms ) ) {

			$actions['delete'] = __( 'Delete' );

		}

		return $actions;

	}

	/**

	 * @return string

	 */

	public function current_action() {

		if ( isset( $_REQUEST['action'] ) && isset( $_REQUEST['delete_tags'] ) && ( 'delete' === $_REQUEST['action'] || 'delete' === $_REQUEST['action2'] ) ) {

			return 'bulk-delete';

		}

		return parent::current_action();

	}

	/**

	 * @return array

	 */

	public function get_columns() {

		$columns = array(

			'cb'          => '<input type="checkbox" />',

			'name'        => _x( 'Name', 'term name' ),

			'description' => __( 'Description' ),

			'slug'        => __( 'Slug' ),

		);

		if ( 'link_category' === $this->screen->taxonomy ) {

			$columns['links'] = __( 'Links' );

		} else {

			$columns['posts'] = _x( 'Count', 'Number/count of items' );

		}

		return $columns;

	}

	/**

	 * @return array

	 */

	protected function get_sortable_columns() {

		return array(

			'name'        => 'name',

			'description' => 'description',

			'slug'        => 'slug',

			'posts'       => 'count',

			'links'       => 'count',

		);

	}

	/**

	 */

	public function display_rows_or_placeholder() {

		$taxonomy = $this->screen->taxonomy;

		$args = wp_parse_args(

			$this->callback_args,

			array(

				'page'       => 1,

				'number'     => 20,

				'search'     => '',

				'hide_empty' => 0,

			)

		);

		$page = $args['page'];

		// Set variable because $args['number'] can be subsequently overridden.

		$number = $args['number'];

		$args['offset'] = $offset = ( $page - 1 ) * $number;

		// Convert it to table rows.

		$count = 0;

		if ( is_taxonomy_hierarchical( $taxonomy ) && ! isset( $args['orderby'] ) ) {

			// We'll need the full set of terms then.

			$args['number'] = $args['offset'] = 0;

		}

		$terms = get_terms( $taxonomy, $args );

		if ( empty( $terms ) || ! is_array( $terms ) ) {

			echo '<tr class="no-items"><td class="colspanchange" colspan="' . $this->get_column_count() . '">';

			$this->no_items();

			echo '</td></tr>';

			return;

		}

		if ( is_taxonomy_hierarchical( $taxonomy ) && ! isset( $args['orderby'] ) ) {

			if ( ! empty( $args['search'] ) ) {// Ignore children on searches.

				$children = array();

			} else {

				$children = _get_term_hierarchy( $taxonomy );

			}

			// Some funky recursion to get the job done( Paging & parents mainly ) is contained within, Skip it for non-hierarchical taxonomies for performance sake

			$this->_rows( $taxonomy, $terms, $children, $offset, $number, $count );

		} else {

			foreach ( $terms as $term ) {

				$this->single_row( $term );

			}

		}

	}

	/**

	 * @param string $taxonomy

	 * @param array $terms

	 * @param array $children

	 * @param int   $start

	 * @param int   $per_page

	 * @param int   $count

	 * @param int   $parent

	 * @param int   $level

	 */

	private function _rows( $taxonomy, $terms, &$children, $start, $per_page, &$count, $parent = 0, $level = 0 ) {

		$end = $start + $per_page;

		foreach ( $terms as $key => $term ) {

			if ( $count >= $end ) {

				break;

			}

			if ( $term->parent != $parent && empty( $_REQUEST['s'] ) ) {

				continue;

			}

			// If the page starts in a subtree, print the parents.

			if ( $count == $start && $term->parent > 0 && empty( $_REQUEST['s'] ) ) {

				$my_parents = $parent_ids = array();

				$p          = $term->parent;

				while ( $p ) {

					$my_parent    = get_term( $p, $taxonomy );

					$my_parents[] = $my_parent;

					$p            = $my_parent->parent;

					if ( in_array( $p, $parent_ids ) ) { // Prevent parent loops.

						break;

					}

					$parent_ids[] = $p;

				}

				unset( $parent_ids );

				$num_parents = count( $my_parents );

				while ( $my_parent = array_pop( $my_parents ) ) {

					echo "\t";

					$this->single_row( $my_parent, $level - $num_parents );

					$num_parents--;

				}

			}

			if ( $count >= $start ) {

				echo "\t";

				$this->single_row( $term, $level );

			}

			++$count;

			unset( $terms[ $key ] );

			if ( isset( $children[ $term->term_id ] ) && empty( $_REQUEST['s'] ) ) {

				$this->_rows( $taxonomy, $terms, $children, $start, $per_page, $count, $term->term_id, $level + 1 );

			}

		}

	}

	/**

	 * @global string $taxonomy

	 * @param WP_Term $tag Term object.

	 * @param int $level

	 */

	public function single_row( $tag, $level = 0 ) {

		global $taxonomy;

		$tag = sanitize_term( $tag, $taxonomy );

		$this->level = $level;

		if ( $tag->parent ) {

			$count = count( get_ancestors( $tag->term_id, $taxonomy, 'taxonomy' ) );

			$level = 'level-' . $count;

		} else {

			$level = 'level-0';

		}

		echo '<tr id="tag-' . $tag->term_id . '" class="' . $level . '">';

		$this->single_row_columns( $tag );

		echo '</tr>';

	}

	/**

	 * @param WP_Term $tag Term object.

	 * @return string

	 */

	public function column_cb( $tag ) {

		if ( current_user_can( 'delete_term', $tag->term_id ) ) {

			return '<label class="screen-reader-text" for="cb-select-' . $tag->term_id . '">' . sprintf( __( 'Select %s' ), $tag->name ) . '</label>'

				. '<input type="checkbox" name="delete_tags[]" value="' . $tag->term_id . '" id="cb-select-' . $tag->term_id . '" />';

		}

		return ' ';

	}

	/**

	 * @param WP_Term $tag Term object.

	 * @return string

	 */

	public function column_name( $tag ) {

		$taxonomy = $this->screen->taxonomy;

		$pad = str_repeat( '— ', max( 0, $this->level ) );

		/**

		 * Filters display of the term name in the terms list table.

		 *

		 * The default output may include padding due to the term's

		 * current level in the term hierarchy.

		 *

		 * @since 2.5.0

		 *

		 * @see WP_Terms_List_Table::column_name()

		 *

		 * @param string $pad_tag_name The term name, padded if not top-level.

		 * @param WP_Term $tag         Term object.

		 */

		$name = apply_filters( 'term_name', $pad . ' ' . $tag->name, $tag );

		$qe_data = get_term( $tag->term_id, $taxonomy, OBJECT, 'edit' );

		$uri = wp_doing_ajax() ? wp_get_referer() : $_SERVER['REQUEST_URI'];

		$edit_link = get_edit_term_link( $tag->term_id, $taxonomy, $this->screen->post_type );

		if ( $edit_link ) {

			$edit_link = add_query_arg(

				'wp_http_referer',

				urlencode( wp_unslash( $uri ) ),

				$edit_link

			);

			$name      = sprintf(

				'<a class="row-title" href="%s" aria-label="%s">%s</a>',

				esc_url( $edit_link ),

				/* translators: %s: taxonomy term name */

				esc_attr( sprintf( __( '“%s” (Edit)' ), $tag->name ) ),

				$name

			);

		}