<?php

if ( ! class_exists( 'acf_field_taxonomy' ) ) :

	class acf_field_taxonomy extends acf_field {

		// vars
		var $save_post_terms = array();


		/*
		*  __construct
		*
		*  This function will setup the field type data
		*
		*  @type    function
		*  @date    5/03/2014
		*  @since   5.0.0
		*
		*  @param   n/a
		*  @return  n/a
		*/

		function initialize() {

			// vars
			$this->name     = 'taxonomy';
			$this->label    = __( 'Taxonomy', 'acf' );
			$this->category = 'relational';
			$this->defaults = array(
				'taxonomy'      => 'category',
				'field_type'    => 'checkbox',
				'multiple'      => 0,
				'allow_null'    => 0,
				'return_format' => 'id',
				'add_term'      => 1, // 5.2.3
				'load_terms'    => 0, // 5.2.7
				'save_terms'    => 0, // 5.2.7
			);

			// Register filter variations.
			acf_add_filter_variations( 'acf/fields/taxonomy/query', array( 'name', 'key' ), 1 );
			acf_add_filter_variations( 'acf/fields/taxonomy/result', array( 'name', 'key' ), 2 );

			// ajax
			add_action( 'wp_ajax_acf/fields/taxonomy/query', array( $this, 'ajax_query' ) );
			add_action( 'wp_ajax_nopriv_acf/fields/taxonomy/query', array( $this, 'ajax_query' ) );
			add_action( 'wp_ajax_acf/fields/taxonomy/add_term', array( $this, 'ajax_add_term' ) );

			// actions
			add_action( 'acf/save_post', array( $this, 'save_post' ), 15, 1 );

		}


		/*
		*  ajax_query
		*
		*  description
		*
		*  @type    function
		*  @date    24/10/13
		*  @since   5.0.0
		*
		*  @param   $post_id (int)
		*  @return  $post_id (int)
		*/

		function ajax_query() {

			// validate
			if ( ! acf_verify_ajax() ) {
				die();
			}

			// get choices
			$response = $this->get_ajax_query( $_POST );

			// return
			acf_send_ajax_results( $response );

		}


		/*
		*  get_ajax_query
		*
		*  This function will return an array of data formatted for use in a select2 AJAX response
		*
		*  @type    function
		*  @date    15/10/2014
		*  @since   5.0.9
		*
		*  @param   $options (array)
		*  @return  (array)
		*/

		function get_ajax_query( $options = array() ) {

			// defaults
			$options = acf_parse_args(
				$options,
				array(
					'post_id'   => 0,
					's'         => '',
					'field_key' => '',
					'paged'     => 0,
				)
			);

			// load field
			$field = acf_get_field( $options['field_key'] );
			if ( ! $field ) {
				return false;
			}

			// bail early if taxonomy does not exist
			if ( ! taxonomy_exists( $field['taxonomy'] ) ) {
				return false;
			}

			// vars
			$results         = array();
			$is_hierarchical = is_taxonomy_hierarchical( $field['taxonomy'] );
			$is_pagination   = ( $options['paged'] > 0 );
			$is_search       = false;
			$limit           = 20;
			$offset          = 20 * ( $options['paged'] - 1 );

			// args
			$args = array(
				'taxonomy'   => $field['taxonomy'],
				'hide_empty' => false,
			);

			// pagination
			// - don't bother for hierarchial terms, we will need to load all terms anyway
			if ( $is_pagination && ! $is_hierarchical ) {

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

			}

			// search
			if ( $options['s'] !== '' ) {

				// strip slashes (search may be integer)
				$s = wp_unslash( strval( $options['s'] ) );

				// update vars
				$args['search'] = $s;
				$is_search      = true;

			}

			// filters
			$args = apply_filters( 'acf/fields/taxonomy/query', $args, $field, $options['post_id'] );

			// get terms
			$terms = acf_get_terms( $args );

			// sort into hierachial order!
			if ( $is_hierarchical ) {

				// update vars
				$limit  = acf_maybe_get( $args, 'number', $limit );
				$offset = acf_maybe_get( $args, 'offset', $offset );

				// get parent
				$parent = acf_maybe_get( $args, 'parent', 0 );
				$parent = acf_maybe_get( $args, 'child_of', $parent );

				// this will fail if a search has taken place because parents wont exist
				if ( ! $is_search ) {

					// order terms
					$ordered_terms = _get_term_children( $parent, $terms, $field['taxonomy'] );

					// check for empty array (possible if parent did not exist within original data)
					if ( ! empty( $ordered_terms ) ) {

						$terms = $ordered_terms;

					}
				}

				// fake pagination
				if ( $is_pagination ) {

					$terms = array_slice( $terms, $offset, $limit );

				}
			}

			// append to r
			foreach ( $terms as $term ) {

				// add to json
				$results[] = array(
					'id'   => $term->term_id,
					'text' => $this->get_term_title( $term, $field, $options['post_id'] ),
				);

			}

			// vars
			$response = array(
				'results' => $results,
				'limit'   => $limit,
			);

			// return
			return $response;

		}

		/**
		 * Returns the Term's title displayed in the field UI.
		 *
		 * @date    1/11/2013
		 * @since   5.0.0
		 *
		 * @param   WP_Term $term The term object.
		 * @param   array   $field The field settings.
		 * @param   mixed   $post_id The post_id being edited.
		 * @return  string
		 */
		function get_term_title( $term, $field, $post_id = 0 ) {
			$title = acf_get_term_title( $term );

			// Default $post_id to current post being edited.
			$post_id = $post_id ? $post_id : acf_get_form_data( 'post_id' );

			/**
			 * Filters the term title.
			 *
			 * @date    1/11/2013
			 * @since   5.0.0
			 *
			 * @param   string $title The term title.
			 * @param   WP_Term $term The term object.
			 * @param   array $field The field settings.
			 * @param   (int|string) $post_id The post_id being edited.
			 */
			 return apply_filters( 'acf/fields/taxonomy/result', $title, $term, $field, $post_id );
		}


		/*
		*  get_terms
		*
		*  This function will return an array of terms for a given field value
		*
		*  @type    function
		*  @date    13/06/2014
		*  @since   5.0.0
		*
		*  @param   $value (array)
		*  @return  $value
		*/

		function get_terms( $value, $taxonomy = 'category' ) {

			// load terms in 1 query to save multiple DB calls from following code
			if ( count( $value ) > 1 ) {

				$terms = acf_get_terms(
					array(
						'taxonomy'   => $taxonomy,
						'include'    => $value,
						'hide_empty' => false,
					)
				);

			}

			// update value to include $post
			foreach ( array_keys( $value ) as $i ) {

				$value[ $i ] = get_term( $value[ $i ], $taxonomy );

			}

			// filter out null values
			$value = array_filter( $value );

			// return
			return $value;
		}


		/*
		*  load_value()
		*
		*  This filter is appied to the $value after it is loaded from the db
		*
		*  @type    filter
		*  @since   3.6
		*  @date    23/01/13
		*
		*  @param   $value - the value found in the database
		*  @param   $post_id - the $post_id from which the value was loaded from
		*  @param   $field - the field array holding all the field options
		*
		*  @return  $value - the value to be saved in te database
		*/

		function load_value( $value, $post_id, $field ) {

			// get valid terms
			$value = acf_get_valid_terms( $value, $field['taxonomy'] );

			// load_terms
			if ( $field['load_terms'] ) {

				// Decode $post_id for $type and $id.
				$decoded = acf_decode_post_id( $post_id );
				$type    = $decoded['type'];
				$id      = $decoded['id'];

				if ( $type === 'block' ) {
					// Get parent block...
				}

				// get terms
				$term_ids = wp_get_object_terms(
					$id,
					$field['taxonomy'],
					array(
						'fields'  => 'ids',
						'orderby' => 'none',
					)
				);

				// bail early if no terms
				if ( empty( $term_ids ) || is_wp_error( $term_ids ) ) {
					return false;
				}

				// sort
				if ( ! empty( $value ) ) {

					$order = array();

					foreach ( $term_ids as $i => $v ) {

						$order[ $i ] = array_search( $v, $value );

					}

					array_multisort( $order, $term_ids );

				}

				// update value
				$value = $term_ids;

			}

			// convert back from array if neccessary
			if ( $field['field_type'] == 'select' || $field['field_type'] == 'radio' ) {

				$value = array_shift( $value );

			}

			// return
			return $value;

		}


		/*
		*  update_value()
		*
		*  This filter is appied to the $value before it is updated in the db
		*
		*  @type    filter
		*  @since   3.6
		*  @date    23/01/13
		*
		*  @param   $value - the value which will be saved in the database
		*  @param   $field - the field array holding all the field options
		*  @param   $post_id - the $post_id of which the value will be saved
		*
		*  @return  $value - the modified value
		*/

		function update_value( $value, $post_id, $field ) {

			// vars
			if ( is_array( $value ) ) {

				$value = array_filter( $value );

			}

			// save_terms
			if ( $field['save_terms'] ) {

				// vars
				$taxonomy = $field['taxonomy'];

				// force value to array
				$term_ids = acf_get_array( $value );

				// convert to int
				$term_ids = array_map( 'intval', $term_ids );

				// get existing term id's (from a previously saved field)
				$old_term_ids = isset( $this->save_post_terms[ $taxonomy ] ) ? $this->save_post_terms[ $taxonomy ] : array();

				// append
				$this->save_post_terms[ $taxonomy ] = array_merge( $old_term_ids, $term_ids );

				// if called directly from frontend update_field()
				if ( ! did_action( 'acf/save_post' ) ) {

					$this->save_post( $post_id );

					return $value;

				}
			}

			// return
			return $value;

		}

		/**
		 * This function will save any terms in the save_post_terms array
		 *
		 * @date    26/11/2014
		 * @since   5.0.9
		 *
		 * @param int $post_id
		 *
		 * @return void
		 */
		function save_post( $post_id ) {
			// Check for saved terms.
			if ( ! empty( $this->save_post_terms ) ) {
				/**
				 * Determine object ID allowing for non "post" $post_id (user, taxonomy, etc).
				 * Although not fully supported by WordPress, non "post" objects may use the term relationships table.
				 * Sharing taxonomies across object types is discouraged, but unique taxonomies work well.
				 * Note: Do not attempt to restrict to "post" only. This has been attempted in 5.8.9 and later reverted.
				 */
				$decoded = acf_decode_post_id( $post_id );
				$type    = $decoded['type'];
				$id      = $decoded['id'];

				if ( $type === 'block' ) {
					// Get parent block...
				}

				// Loop over taxonomies and save terms.
				foreach ( $this->save_post_terms as $taxonomy => $term_ids ) {
					wp_set_object_terms( $id, $term_ids, $taxonomy, false );
				}

				// Reset storage.
				$this->save_post_terms = array();
			}
		}

		/*
		*  format_value()
		*
		*  This filter is appied to the $value after it is loaded from the db and before it is returned to the template
		*
		*  @type    filter
		*  @since   3.6
		*  @date    23/01/13
		*
		*  @param   $value (mixed) the value which was loaded from the database
		*  @param   $post_id (mixed) the $post_id from which the value was loaded
		*  @param   $field (array) the field array holding all the field options
		*
		*  @return  $value (mixed) the modified value
		*/

		function format_value( $value, $post_id, $field ) {

			// bail early if no value
			if ( empty( $value ) ) {
				return false;
			}

			// force value to array
			$value = acf_get_array( $value );

			// load posts if needed
			if ( $field['return_format'] == 'object' ) {

				// get posts
				$value = $this->get_terms( $value, $field['taxonomy'] );

			}

			// convert back from array if neccessary
			if ( $field['field_type'] == 'select' || $field['field_type'] == 'radio' ) {

				$value = array_shift( $value );

			}

			// return
			return $value;

		}


		/*
		*  render_field()
		*
		*  Create the HTML interface for your field
		*
		*  @type    action
		*  @since   3.6
		*  @date    23/01/13
		*
		*  @param   $field - an array holding all the field's data
		*/

		function render_field( $field ) {

			// force value to array
			$field['value'] = acf_get_array( $field['value'] );

			// vars
			$div = array(
				'class'           => 'acf-taxonomy-field',
				'data-save'       => $field['save_terms'],
				'data-ftype'      => $field['field_type'],
				'data-taxonomy'   => $field['taxonomy'],
				'data-allow_null' => $field['allow_null'],
			);

			// get taxonomy
			$taxonomy = get_taxonomy( $field['taxonomy'] );

			// bail early if taxonomy does not exist
			if ( ! $taxonomy ) {
				return;
			}

			?>
<div <?php acf_esc_attr_e( $div ); ?>>
			<?php if ( $field['add_term'] && current_user_can( $taxonomy->cap->manage_terms ) ) : ?>
	<div class="acf-actions -hover">
		<a href="#" class="acf-icon -plus acf-js-tooltip small" data-name="add" title="<?php echo esc_attr( $taxonomy->labels->add_new_item ); ?>"></a>
	</div>
				<?php
	endif;

			if ( $field['field_type'] == 'select' ) {

				$field['multiple'] = 0;

				$this->render_field_select( $field );

			} elseif ( $field['field_type'] == 'multi_select' ) {

				$field['multiple'] = 1;

				$this->render_field_select( $field );

			} elseif ( $field['field_type'] == 'radio' ) {

				$this->render_field_checkbox( $field );

			} elseif ( $field['field_type'] == 'checkbox' ) {

				$this->render_field_checkbox( $field );

			}

			?>
</div>
			<?php

		}


		/*
		*  render_field_select()
		*
		*  Create the HTML interface for your field
		*
		*  @type    action
		*  @since   3.6
		*  @date    23/01/13
		*
		*  @param   $field - an array holding all the field's data
		*/

		function render_field_select( $field ) {

			// Change Field into a select
			$field['type']    = 'select';
			$field['ui']      = 1;
			$field['ajax']    = 1;
			$field['choices'] = array();

			// value
			if ( ! empty( $field['value'] ) ) {

				// get terms
				$terms = $this->get_terms( $field['value'], $field['taxonomy'] );

				// set choices
				if ( ! empty( $terms ) ) {

					foreach ( array_keys( $terms ) as $i ) {

						// vars
						$term = acf_extract_var( $terms, $i );

						// append to choices
						$field['choices'][ $term->term_id ] = $this->get_term_title( $term, $field );

					}
				}
			}

			// render select
			acf_render_field( $field );

		}


		/*
		*  render_field_checkbox()
		*
		*  Create the HTML interface for your field
		*
		*  @type    action
		*  @since   3.6
		*  @date    23/01/13
		*
		*  @param   $field - an array holding all the field's data
		*/

		function render_field_checkbox( $field ) {

			// hidden input
			acf_hidden_input(
				array(
					'type' => 'hidden',
					'name' => $field['name'],
				)
			);

			// checkbox saves an array
			if ( $field['field_type'] == 'checkbox' ) {

				$field['name'] .= '[]';

			}

			// taxonomy
			$taxonomy_obj = get_taxonomy( $field['taxonomy'] );

			// include walker
			acf_include( 'includes/walkers/class-acf-walker-taxonomy-field.php' );

			// vars
			$args = array(
				'taxonomy'         => $field['taxonomy'],
				'show_option_none' => sprintf( _x( 'No %s', 'No terms', 'acf' ), strtolower( $taxonomy_obj->labels->name ) ),
				'hide_empty'       => false,
				'style'            => 'none',
				'walker'           => new ACF_Taxonomy_Field_Walker( $field ),
			);

			// filter for 3rd party customization
			$args = apply_filters( 'acf/fields/taxonomy/wp_list_categories', $args, $field );
			$args = apply_filters( 'acf/fields/taxonomy/wp_list_categories/name=' . $field['_name'], $args, $field );
			$args = apply_filters( 'acf/fields/taxonomy/wp_list_categories/key=' . $field['key'], $args, $field );

			?>
<div class="categorychecklist-holder">
	<ul class="acf-checkbox-list acf-bl">
			<?php wp_list_categories( $args ); ?>
	</ul>
</div>
			<?php

		}


		/*
		*  render_field_settings()
		*
		*  Create extra options for your field. This is rendered when editing a field.
		*  The value of $field['name'] can be used (like bellow) to save extra data to the $field
		*
		*  @type    action
		*  @since   3.6
		*  @date    23/01/13
		*
		*  @param   $field  - an array holding all the field's data
		*/

		function render_field_settings( $field ) {

			// default_value
			acf_render_field_setting(
				$field,
				array(
					'label'        => __( 'Taxonomy', 'acf' ),
					'instructions' => __( 'Select the taxonomy to be displayed', 'acf' ),
					'type'         => 'select',
					'name'         => 'taxonomy',
					'choices'      => acf_get_taxonomy_labels(),
				)
			);

			// field_type
			acf_render_field_setting(
				$field,
				array(
					'label'        => __( 'Appearance', 'acf' ),
					'instructions' => __( 'Select the appearance of this field', 'acf' ),
					'type'         => 'select',
					'name'         => 'field_type',
					'optgroup'     => true,
					'choices'      => array(
						__( 'Multiple Values', 'acf' ) => array(
							'checkbox'     => __( 'Checkbox', 'acf' ),
							'multi_select' => __( 'Multi Select', 'acf' ),
						),
						__( 'Single Value', 'acf' )    => array(
							'radio'  => __( 'Radio Buttons', 'acf' ),
							'select' => _x( 'Select', 'noun', 'acf' ),
						),
					),
				)
			);

			// allow_null
			acf_render_field_setting(
				$field,
				array(
					'label'        => __( 'Allow Null?', 'acf' ),
					'instructions' => '',
					'name'         => 'allow_null',
					'type'         => 'true_false',
					'ui'           => 1,
					'conditions'   => array(
						'field'    => 'field_type',
						'operator' => '!=',
						'value'    => 'checkbox',
					),
				)
			);

			// add_term
			acf_render_field_setting(
				$field,
				array(
					'label'        => __( 'Create Terms', 'acf' ),
					'instructions' => __( 'Allow new terms to be created whilst editing', 'acf' ),
					'name'         => 'add_term',
					'type'         => 'true_false',
					'ui'           => 1,
				)
			);

			// save_terms
			acf_render_field_setting(
				$field,
				array(
					'label'        => __( 'Save Terms', 'acf' ),
					'instructions' => __( 'Connect selected terms to the post', 'acf' ),
					'name'         => 'save_terms',
					'type'         => 'true_false',
					'ui'           => 1,
				)
			);

			// load_terms
			acf_render_field_setting(
				$field,
				array(
					'label'        => __( 'Load Terms', 'acf' ),
					'instructions' => __( 'Load value from posts terms', 'acf' ),
					'name'         => 'load_terms',
					'type'         => 'true_false',
					'ui'           => 1,
				)
			);

			// return_format
			acf_render_field_setting(
				$field,
				array(
					'label'        => __( 'Return Value', 'acf' ),
					'instructions' => '',
					'type'         => 'radio',
					'name'         => 'return_format',
					'choices'      => array(
						'object' => __( 'Term Object', 'acf' ),
						'id'     => __( 'Term ID', 'acf' ),
					),
					'layout'       => 'horizontal',
				)
			);

		}


		/*
		*  ajax_add_term
		*
		*  description
		*
		*  @type    function
		*  @date    17/04/2015
		*  @since   5.2.3
		*
		*  @param   $post_id (int)
		*  @return  $post_id (int)
		*/

		function ajax_add_term() {

			// vars
			$args = wp_parse_args(
				$_POST,
				array(
					'nonce'       => '',
					'field_key'   => '',
					'term_name'   => '',
					'term_parent' => '',
				)
			);

			// verify nonce
			if ( ! acf_verify_ajax() ) {
				die();
			}

			// load field
			$field = acf_get_field( $args['field_key'] );
			if ( ! $field ) {
				die();
			}

			// vars
			$taxonomy_obj   = get_taxonomy( $field['taxonomy'] );
			$taxonomy_label = $taxonomy_obj->labels->singular_name;

			// validate cap
			// note: this situation should never occur due to condition of the add new button
			if ( ! current_user_can( $taxonomy_obj->cap->manage_terms ) ) {
				wp_send_json_error(
					array(
						'error' => sprintf( __( 'User unable to add new %s', 'acf' ), $taxonomy_label ),
					)
				);
			}

			// save?
			if ( $args['term_name'] ) {

				// exists
				if ( term_exists( $args['term_name'], $field['taxonomy'], $args['term_parent'] ) ) {
					wp_send_json_error(
						array(
							'error' => sprintf( __( '%s already exists', 'acf' ), $taxonomy_label ),
						)
					);
				}

				// vars
				$extra = array();
				if ( $args['term_parent'] ) {
					$extra['parent'] = (int) $args['term_parent'];
				}

				// insert
				$data = wp_insert_term( $args['term_name'], $field['taxonomy'], $extra );

				// error
				if ( is_wp_error( $data ) ) {
					wp_send_json_error(
						array(
							'error' => $data->get_error_message(),
						)
					);
				}

				// load term
				$term = get_term( $data['term_id'] );

				// prepend ancenstors count to term name
				$prefix    = '';
				$ancestors = get_ancestors( $term->term_id, $term->taxonomy );
				if ( ! empty( $ancestors ) ) {
					$prefix = str_repeat( '- ', count( $ancestors ) );
				}

				// success
				wp_send_json_success(
					array(
						'message'     => sprintf( __( '%s added', 'acf' ), $taxonomy_label ),
						'term_id'     => $term->term_id,
						'term_name'   => $term->name,
						'term_label'  => $prefix . $term->name,
						'term_parent' => $term->parent,
					)
				);

			}

			?>
		<form method="post">
			<?php

			acf_render_field_wrap(
				array(
					'label' => __( 'Name', 'acf' ),
					'name'  => 'term_name',
					'type'  => 'text',
				)
			);

			if ( is_taxonomy_hierarchical( $field['taxonomy'] ) ) {

				$choices  = array();
				$response = $this->get_ajax_query( $args );

				if ( $response ) {

					foreach ( $response['results'] as $v ) {

						$choices[ $v['id'] ] = $v['text'];

					}
				}

				acf_render_field_wrap(
					array(
						'label'      => __( 'Parent', 'acf' ),
						'name'       => 'term_parent',
						'type'       => 'select',
						'allow_null' => 1,
						'ui'         => 0,
						'choices'    => $choices,
					)
				);

			}

			?>
		<p class="acf-submit">
			<button class="acf-submit-button button button-primary" type="submit"><?php _e( 'Add', 'acf' ); ?></button>
		</p>
		</form><?php

		// die
		die;

		}

		/**
		 * Return the schema array for the REST API.
		 *
		 * @param array $field
		 * @return array
		 */
		public function get_rest_schema( array $field ) {
			$schema = array(
				'type'     => array( 'integer', 'array', 'null' ),
				'required' => ! empty( $field['required'] ),
				'items'    => array(
					'type' => 'integer',
				),
			);

			if ( empty( $field['allow_null'] ) ) {
				$schema['minItems'] = 1;
			}

			if ( in_array( $field['field_type'], array( 'radio', 'select' ) ) ) {
				$schema['maxItems'] = 1;
			}

			return $schema;
		}

		/**
		 * @see \acf_field::get_rest_links()
		 * @param mixed      $value The raw (unformatted) field value.
		 * @param int|string $post_id
		 * @param array      $field
		 * @return array
		 */
		public function get_rest_links( $value, $post_id, array $field ) {
			$links = array();

			if ( empty( $value ) ) {
				return $links;
			}

			foreach ( (array) $value as $object_id ) {
				$term = get_term( $object_id );
				if ( ! $term instanceof WP_Term ) {
					continue;
				}

				$rest_base = acf_get_object_type_rest_base( get_taxonomy( $term->taxonomy ) );
				if ( ! $rest_base ) {
					continue;
				}

				$links[] = array(
					'rel'        => 'acf:term',
					'href'       => rest_url( sprintf( '/wp/v2/%s/%s', $rest_base, $object_id ) ),
					'embeddable' => true,
					'taxonomy'   => $term->taxonomy,
				);
			}

			return $links;
		}

	}


	// initialize
	acf_register_field_type( 'acf_field_taxonomy' );

endif; // class_exists check

?>
