<?php

if ( ! class_exists( 'acf_field' ) ) :

	class acf_field {

		// vars
		var $name = '',
		$label    = '',
		$category = 'basic',
		$defaults = array(),
		$l10n     = array(),
		$public   = true;

		public $show_in_rest = true;

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

		function __construct() {

			// initialize
			$this->initialize();

			// register info
			acf_register_field_type_info(
				array(
					'label'    => $this->label,
					'name'     => $this->name,
					'category' => $this->category,
					'public'   => $this->public,
				)
			);

			// value
			$this->add_field_filter( 'acf/load_value', array( $this, 'load_value' ), 10, 3 );
			$this->add_field_filter( 'acf/update_value', array( $this, 'update_value' ), 10, 3 );
			$this->add_field_filter( 'acf/format_value', array( $this, 'format_value' ), 10, 3 );
			$this->add_field_filter( 'acf/validate_value', array( $this, 'validate_value' ), 10, 4 );
			$this->add_field_action( 'acf/delete_value', array( $this, 'delete_value' ), 10, 3 );

			// field
			$this->add_field_filter( 'acf/validate_rest_value', array( $this, 'validate_rest_value' ), 10, 3 );
			$this->add_field_filter( 'acf/validate_field', array( $this, 'validate_field' ), 10, 1 );
			$this->add_field_filter( 'acf/load_field', array( $this, 'load_field' ), 10, 1 );
			$this->add_field_filter( 'acf/update_field', array( $this, 'update_field' ), 10, 1 );
			$this->add_field_filter( 'acf/duplicate_field', array( $this, 'duplicate_field' ), 10, 1 );
			$this->add_field_action( 'acf/delete_field', array( $this, 'delete_field' ), 10, 1 );
			$this->add_field_action( 'acf/render_field', array( $this, 'render_field' ), 9, 1 );
			$this->add_field_action( 'acf/render_field_settings', array( $this, 'render_field_settings' ), 9, 1 );
			$this->add_field_filter( 'acf/prepare_field', array( $this, 'prepare_field' ), 10, 1 );
			$this->add_field_filter( 'acf/translate_field', array( $this, 'translate_field' ), 10, 1 );

			// input actions
			$this->add_action( 'acf/input/admin_enqueue_scripts', array( $this, 'input_admin_enqueue_scripts' ), 10, 0 );
			$this->add_action( 'acf/input/admin_head', array( $this, 'input_admin_head' ), 10, 0 );
			$this->add_action( 'acf/input/form_data', array( $this, 'input_form_data' ), 10, 1 );
			$this->add_filter( 'acf/input/admin_l10n', array( $this, 'input_admin_l10n' ), 10, 1 );
			$this->add_action( 'acf/input/admin_footer', array( $this, 'input_admin_footer' ), 10, 1 );

			// field group actions
			$this->add_action( 'acf/field_group/admin_enqueue_scripts', array( $this, 'field_group_admin_enqueue_scripts' ), 10, 0 );
			$this->add_action( 'acf/field_group/admin_head', array( $this, 'field_group_admin_head' ), 10, 0 );
			$this->add_action( 'acf/field_group/admin_footer', array( $this, 'field_group_admin_footer' ), 10, 0 );

		}


		/*
		*  initialize
		*
		*  This function will initialize the field type
		*
		*  @type    function
		*  @date    27/6/17
		*  @since   5.6.0
		*
		*  @param   n/a
		*  @return  n/a
		*/

		function initialize() {

			/* do nothing */

		}


		/*
		*  add_filter
		*
		*  This function checks if the function is_callable before adding the filter
		*
		*  @type    function
		*  @date    5/03/2014
		*  @since   5.0.0
		*
		*  @param   $tag (string)
		*  @param   $function_to_add (string)
		*  @param   $priority (int)
		*  @param   $accepted_args (int)
		*  @return  n/a
		*/

		function add_filter( $tag = '', $function_to_add = '', $priority = 10, $accepted_args = 1 ) {

			// bail early if no callable
			if ( ! is_callable( $function_to_add ) ) {
				return;
			}

			// add
			add_filter( $tag, $function_to_add, $priority, $accepted_args );

		}


		/*
		*  add_field_filter
		*
		*  This function will add a field type specific filter
		*
		*  @type    function
		*  @date    29/09/2016
		*  @since   5.4.0
		*
		*  @param   $tag (string)
		*  @param   $function_to_add (string)
		*  @param   $priority (int)
		*  @param   $accepted_args (int)
		*  @return  n/a
		*/

		function add_field_filter( $tag = '', $function_to_add = '', $priority = 10, $accepted_args = 1 ) {

			// append
			$tag .= '/type=' . $this->name;

			// add
			$this->add_filter( $tag, $function_to_add, $priority, $accepted_args );

		}


		/*
		*  add_action
		*
		*  This function checks if the function is_callable before adding the action
		*
		*  @type    function
		*  @date    5/03/2014
		*  @since   5.0.0
		*
		*  @param   $tag (string)
		*  @param   $function_to_add (string)
		*  @param   $priority (int)
		*  @param   $accepted_args (int)
		*  @return  n/a
		*/

		function add_action( $tag = '', $function_to_add = '', $priority = 10, $accepted_args = 1 ) {

			// bail early if no callable
			if ( ! is_callable( $function_to_add ) ) {
				return;
			}

			// add
			add_action( $tag, $function_to_add, $priority, $accepted_args );

		}


		/*
		*  add_field_action
		*
		*  This function will add a field type specific filter
		*
		*  @type    function
		*  @date    29/09/2016
		*  @since   5.4.0
		*
		*  @param   $tag (string)
		*  @param   $function_to_add (string)
		*  @param   $priority (int)
		*  @param   $accepted_args (int)
		*  @return  n/a
		*/

		function add_field_action( $tag = '', $function_to_add = '', $priority = 10, $accepted_args = 1 ) {

			// append
			$tag .= '/type=' . $this->name;

			// add
			$this->add_action( $tag, $function_to_add, $priority, $accepted_args );

		}


		/*
		*  validate_field
		*
		*  This function will append default settings to a field
		*
		*  @type    filter ("acf/validate_field/type={$this->name}")
		*  @since   3.6
		*  @date    23/01/13
		*
		*  @param   $field (array)
		*  @return  $field (array)
		*/

		function validate_field( $field ) {

			// bail early if no defaults
			if ( ! is_array( $this->defaults ) ) {
				return $field;
			}

			// merge in defaults but keep order of $field keys
			foreach ( $this->defaults as $k => $v ) {

				if ( ! isset( $field[ $k ] ) ) {
					$field[ $k ] = $v;
				}
			}

			// return
			return $field;

		}


		/*
		*  admin_l10n
		*
		*  This function will append l10n text translations to an array which is later passed to JS
		*
		*  @type    filter ("acf/input/admin_l10n")
		*  @since   3.6
		*  @date    23/01/13
		*
		*  @param   $l10n (array)
		*  @return  $l10n (array)
		*/

		function input_admin_l10n( $l10n ) {

			// bail early if no defaults
			if ( empty( $this->l10n ) ) {
				return $l10n;
			}

			// append
			$l10n[ $this->name ] = $this->l10n;

			// return
			return $l10n;

		}

		/**
		 * Add additional validation for fields being updated via the REST API.
		 *
		 * @param bool  $valid
		 * @param mixed $value
		 * @param array $field
		 *
		 * @return bool|WP_Error
		 */
		public function validate_rest_value( $valid, $value, $field ) {
			return $valid;
		}

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

			if ( isset( $field['default_value'] ) && '' !== $field['default_value'] ) {
				$schema['default'] = $field['default_value'];
			}

			return $schema;
		}

		/**
		 * Return an array of links for addition to the REST API response. Each link is an array and must have both `rel` and
		 * `href` keys. The `href` key must be a REST API resource URL. If a link is marked as `embeddable`, the `_embed` URL
		 * parameter will trigger WordPress to dispatch an internal sub request and load the object within the same request
		 * under the `_embedded` response property.
		 *
		 * e.g;
		 *    [
		 *        [
		 *            'rel' => 'acf:post',
		 *            'href' => 'https://example.com/wp-json/wp/v2/posts/497',
		 *            'embeddable' => true,
		 *        ],
		 *        [
		 *            'rel' => 'acf:user',
		 *            'href' => 'https://example.com/wp-json/wp/v2/users/2',
		 *            'embeddable' => true,
		 *        ],
		 *    ]
		 *
		 * @param mixed      $value The raw (unformatted) field value.
		 * @param string|int $post_id
		 * @param array      $field
		 * @return array
		 */
		public function get_rest_links( $value, $post_id, array $field ) {
			return array();
		}

		/**
		 * Apply basic formatting to prepare the value for default REST output.
		 *
		 * @param mixed      $value
		 * @param string|int $post_id
		 * @param array      $field
		 * @return mixed
		 */
		public function format_value_for_rest( $value, $post_id, array $field ) {
			return $value;
		}

	}

endif; // class_exists check


