<?php

/**

 * WordPress Taxonomy Administration API.

 *

 * @package WordPress

 * @subpackage Administration

 */

//

// Category

//

/**

 * Check whether a category exists.

 *

 * @since 2.0.0

 *

 * @see term_exists()

 *

 * @param int|string $cat_name Category name.

 * @param int        $parent   Optional. ID of parent term.

 * @return mixed

 */

function category_exists( $cat_name, $parent = null ) {

	$id = term_exists($cat_name, 'category', $parent);

	if ( is_array($id) )

		$id = $id['term_id'];

	return $id;

}

/**

 * Get category object for given ID and 'edit' filter context.

 *

 * @since 2.0.0

 *

 * @param int $id

 * @return object

 */

function get_category_to_edit( $id ) {

	$category = get_term( $id, 'category', OBJECT, 'edit' );

	_make_cat_compat( $category );

	return $category;

}

/**

 * Add a new category to the database if it does not already exist.

 *

 * @since 2.0.0

 *

 * @param int|string $cat_name

 * @param int        $parent

 * @return int|WP_Error

 */

function wp_create_category( $cat_name, $parent = 0 ) {

	if ( $id = category_exists($cat_name, $parent) )

		return $id;

	return wp_insert_category( array('cat_name' => $cat_name, 'category_parent' => $parent) );

}

/**

 * Create categories for the given post.

 *

 * @since 2.0.0

 *

 * @param array $categories List of categories to create.

 * @param int   $post_id    Optional. The post ID. Default empty.

 */

function wp_create_categories( $categories, $post_id = '' ) {

	$cat_ids = array ();

	foreach ( $categories as $category ) {

		if ( $id = category_exists( $category ) ) {

			$cat_ids[] = $id;

		} elseif ( $id = wp_create_category( $category ) ) {

			$cat_ids[] = $id;

		}

	}

	if ( $post_id )

		wp_set_post_categories($post_id, $cat_ids);

	return $cat_ids;

}

/**

 * Updates an existing Category or creates a new Category.

 *

 * @since 2.0.0

 * @since 2.5.0 $wp_error parameter was added.

 * @since 3.0.0 The 'taxonomy' argument was added.

 *

 * @param array $catarr {

 *     Array of arguments for inserting a new category.

 *

 *                                            Default 0.

 *     @type string     $category_description Category description. Default empty.

 *     @type string     $category_nicename    Category nice (display) name. Default empty.

 *     @type int|string $category_parent      Category parent ID. Default empty.

 * }

 * @param bool  $wp_error Optional. Default false.

 * @return int|object The ID number of the new or updated Category on success. Zero or a WP_Error on failure,

 *                    depending on param $wp_error.

 */

function wp_insert_category( $catarr, $wp_error = false ) {

	$cat_defaults = array( 'cat_ID' => 0, 'taxonomy' => 'category', 'cat_name' => '', 'category_description' => '', 'category_nicename' => '', 'category_parent' => '' );

	$catarr = wp_parse_args( $catarr, $cat_defaults );

	if ( trim( $catarr['cat_name'] ) == '' ) {

		if ( ! $wp_error ) {

			return 0;

		} else {

			return new WP_Error( 'cat_name', __( 'You did not enter a category name.' ) );

		}

	}

	$catarr['cat_ID'] = (int) $catarr['cat_ID'];

	// Are we updating or creating?

	$update = ! empty ( $catarr['cat_ID'] );

	$name = $catarr['cat_name'];

	$description = $catarr['category_description'];

	$slug = $catarr['category_nicename'];

	$parent = (int) $catarr['category_parent'];

	if ( $parent < 0 ) {

		$parent = 0;

	}

	if ( empty( $parent )

		|| ! term_exists( $parent, $catarr['taxonomy'] )

		|| ( $catarr['cat_ID'] && term_is_ancestor_of( $catarr['cat_ID'], $parent, $catarr['taxonomy'] ) ) ) {

		$parent = 0;

	}

	$args = compact('name', 'slug', 'parent', 'description');

	if ( $update ) {

		$catarr['cat_ID'] = wp_update_term( $catarr['cat_ID'], $catarr['taxonomy'], $args );

	} else {

		$catarr['cat_ID'] = wp_insert_term( $catarr['cat_name'], $catarr['taxonomy'], $args );

	}

	if ( is_wp_error( $catarr['cat_ID'] ) ) {

		if ( $wp_error ) {

			return $catarr['cat_ID'];

		} else {

			return 0;

		}

	}

	return $catarr['cat_ID']['term_id'];

}

/**

 * Aliases wp_insert_category() with minimal args.

 *

 * If you want to update only some fields of an existing category, call this

 * function with only the new values set inside $catarr.

 *

 * @since 2.0.0

 *

 * @param array $catarr The 'cat_ID' value is required. All other keys are optional.

 * @return int|bool The ID number of the new or updated Category on success. Zero or FALSE on failure.

 */

function wp_update_category($catarr) {

	$cat_ID = (int) $catarr['cat_ID'];

	if ( isset($catarr['category_parent']) && ($cat_ID == $catarr['category_parent']) )

		return false;

	// First, get all of the original fields

	$category = get_term( $cat_ID, 'category', ARRAY_A );

	_make_cat_compat( $category );

	// Escape data pulled from DB.

	$category = wp_slash($category);

	// Merge old and new fields with new fields overwriting old ones.

	$catarr = array_merge($category, $catarr);

	return wp_insert_category($catarr);

}

//

// Tags

//

/**

 * Check whether a post tag with a given name exists.

 *

 * @since 2.3.0

 *

 * @param int|string $tag_name

 * @return mixed

 */

function tag_exists($tag_name) {

	return term_exists($tag_name, 'post_tag');

}

/**

 * Add a new tag to the database if it does not already exist.

 *

 * @since 2.3.0

 *

 * @param int|string $tag_name

 * @return array|WP_Error

 */

function wp_create_tag($tag_name) {

	return wp_create_term( $tag_name, 'post_tag');

}

/**

 * Get comma-separated list of tags available to edit.

 *

 * @since 2.3.0

 *

 * @param int    $post_id

 * @param string $taxonomy Optional. The taxonomy for which to retrieve terms. Default 'post_tag'.

 * @return string|bool|WP_Error

 */

function get_tags_to_edit( $post_id, $taxonomy = 'post_tag' ) {

	return get_terms_to_edit( $post_id, $taxonomy);

}

/**

 * Get comma-separated list of terms available to edit for the given post ID.

 *

 * @since 2.8.0

 *

 * @param int    $post_id

 * @param string $taxonomy Optional. The taxonomy for which to retrieve terms. Default 'post_tag'.

 * @return string|bool|WP_Error

 */

function get_terms_to_edit( $post_id, $taxonomy = 'post_tag' ) {

	$post_id = (int) $post_id;

	if ( !$post_id )

		return false;

	$terms = get_object_term_cache( $post_id, $taxonomy );

	if ( false === $terms ) {

		$terms = wp_get_object_terms( $post_id, $taxonomy );

	}

	if ( ! $terms ) {

		return false;

	}

	if ( is_wp_error( $terms ) ) {

		return $terms;

	}

	$term_names = array();

	foreach ( $terms as $term ) {

		$term_names[] = $term->name;

	}

	$terms_to_edit = esc_attr( join( ',', $term_names ) );

	/**

	 *

	 * @since 2.8.0

	 *

	 * @see get_terms_to_edit()

	 *

	 * @param array  $terms_to_edit An array of terms.

	 * @param string $taxonomy     The taxonomy for which to retrieve terms. Default 'post_tag'.

	 */

	$terms_to_edit = apply_filters( 'terms_to_edit', $terms_to_edit, $taxonomy );

	return $terms_to_edit;

}

/**

 * Add a new term to the database if it does not already exist.

 *

 * @since 2.8.0

 *

 * @param int|string $tag_name

 * @param string $taxonomy Optional. The taxonomy for which to retrieve terms. Default 'post_tag'.

 * @return array|WP_Error

 */

function wp_create_term($tag_name, $taxonomy = 'post_tag') {

	if ( $id = term_exists($tag_name, $taxonomy) )

		return $id;

	return wp_insert_term($tag_name, $taxonomy);

}