<?php
/**
 * @file class-gravityview-field.php
 * @package GravityView
 * @subpackage includes\fields
 */

/**
 * Modify field settings by extending this class.
 */
abstract class GravityView_Field {

	/**
	 * The name of the GravityView field type
	 * Example: `created_by`, `text`, `fileupload`, `address`, `entry_link`
	 *
	 * @var string
	 */
	public $name;

	/**
	 * @internal Not yet implemented
	 * @since 1.15.2
	 * @type string The description of the field in the field picker
	 */
	public $description;

	/**
	 * @since 1.15.2
	 * @type string The label of the field in the field picker
	 */
	public $label;

	/**
	 * @var string The default search label used by the search widget, if not set
	 */
	public $default_search_label;

	/**
	 * `standard`, `advanced`, `post`, `pricing`, `meta`, `gravityview`, or `add-ons`, or `featured`.
	 *
	 * Featured are moved to the top of the field picker.
	 *
	 * @since 1.15.2
	 * @type string The group belongs to this field in the field picker
	 */
	public $group;

	/**
	 * @internal Not yet implemented
	 * @type boolean Can the field be searched?
	 * @since 1.15.2
	 */
	public $is_searchable = true;

	/**
	 * @internal Not yet implemented
	 * @type array $search_operators The type of search operators available for this field
	 * @since 1.15.2
	 */
	public $search_operators;

	/**
	 * @type boolean Can the field be sorted in search?
	 * @since 1.15.2
	 */
	public $is_sortable = true;

	/**
	 * @type boolean Is field content number-based?
	 * @since 1.15.2
	 */
	public $is_numeric;

	/**
	 * @var null|string The key used to search and sort entry meta in Gravity Forms. Used if the field stores data as custom entry meta.
	 * @see https://www.gravityhelp.com/documentation/article/gform_entry_meta/
	 * @since 1.19
	 */
	public $entry_meta_key = null;

	/**
	 * @var string|array Optional. The callback function after entry meta is updated, only used if $entry_meta_key is set.
	 * @see https://www.gravityhelp.com/documentation/article/gform_entry_meta/
	 * @since 1.19
	 */
	public $entry_meta_update_callback = null;

	/**
	 * @var bool Whether to show meta when set to true automatically adds the column to the entry list, without having to edit and add the column for display
	 * @since 1.19
	 */
	public $entry_meta_is_default_column = false;

	/**
	 * @internal Not yet implemented
	 * @todo implement supports_context() method
	 * The contexts in which a field is available. Some fields aren't editable, for example.
	 * - `singular` is an alias for both `single` and `edit`
	 * - `multiple` is an alias for `directory` (backward compatibility)
	 * @type array
	 * @since 1.15.2
	 */
	public $contexts = array( 'single', 'multiple', 'edit', 'export', 'search' );

	/**
	 * @var string An icon that represents the field type in the field picker.
	 *
	 * Supports these icon formats:
	 * - Gravity Forms icon class: The string starts with "gform-icon". Note: the site must be running GF 2.5+. No need to also pass "gform-icon".
	 * - Dashicons: The string starts with "dashicons". No need to also pass "dashicons".
	 * - Inline SVG: Starts with "data:"
	 * - If not matching those formats, the value will be used as a CSS class in a `<i>` element.
	 *
	 * @since 2.8.1
	 * @see GravityView_Admin_View_Item::getOutput
	 */
	public $icon = 'dashicons-admin-generic';

	/**
	 * @since 1.15.2
	 * @since 1.16.2.2 Changed access to public (previously, protected)
	 * @type string The name of a corresponding Gravity Forms GF_Field class, if exists
	 */
	public $_gf_field_class_name;

	/**
	 * @var string The field ID being requested
	 * @since 1.14
	 */
	protected $_field_id = '';

	/**
	 * @var string Field options to be rendered
	 * @since 1.14
	 */
	protected $_field_options = array();

	/**
	 * @var bool|string Name of merge tag (without curly brackets), if the field has custom GravityView merge tags to add. Otherwise, false.
	 * @since 1.16
	 */
	protected $_custom_merge_tag = false;

	/**
	 * GravityView_Field constructor.
	 */
	public function __construct() {

		/**
		 * Modify the field options based on the name of the field type
		 *
		 * @see GravityView_Render_Settings::get_default_field_options
		 */
		add_filter( sprintf( 'gravityview_template_%s_options', $this->name ), array( &$this, 'field_options' ), 10, 6 );

		add_filter( 'gravityview/sortable/field_blocklist', array( $this, '_filter_sortable_fields' ), 1 );

		if ( $this->entry_meta_key ) {
			add_filter( 'gform_entry_meta', array( $this, 'add_entry_meta' ) );
			add_filter( 'gravityview/common/sortable_fields', array( $this, 'add_sortable_field' ), 10, 2 );
		}

		if ( $this->_custom_merge_tag ) {
			add_filter( 'gform_custom_merge_tags', array( $this, '_filter_gform_custom_merge_tags' ), 10, 4 );
			add_filter( 'gform_replace_merge_tags', array( $this, '_filter_gform_replace_merge_tags' ), 10, 7 );
		}

		if ( 'meta' === $this->group || '' !== $this->default_search_label ) {
			add_filter( 'gravityview_search_field_label', array( $this, 'set_default_search_label' ), 10, 3 );
		}

		/**
		 * Auto-assign label from Gravity Forms label, if exists.
		 * Deferred to 'init' to avoid triggering translations too early.
		 *
		 * @since 1.20
		 */
		if ( empty( $this->label ) && ! empty( $this->_gf_field_class_name ) ) {
			$field = $this;

			add_action( 'init', static function () use ( $field ) {
				if ( ! empty( $field->label ) || ! class_exists( $field->_gf_field_class_name ) ) {
					return;
				}

				$field->label = ucfirst( GF_Fields::get( $field->name )->get_form_editor_field_title() );
			}, 1 );
		}

		try {
			GravityView_Fields::register( $this );
		} catch ( Exception $exception ) {
			gravityview()->log->critical( $exception->getMessage() );
		}
	}

	/**
	 * Returns the field as an array to be used in field pickers
	 *
	 * @since 2.10
	 *
	 * @return array[]
	 */
	public function as_array() {
		return array(
			$this->name => array(
				'label' => $this->label,
				'desc'  => $this->description,
				'type'  => $this->name,
				'icon'  => $this->icon,
				'group' => $this->group,
			),
		);
	}

	/**
	 * Returns the icon for a field
	 *
	 * @since 2.17
	 *
	 * @return string The dashicon or gform-icon class name for a field.
	 */
	public function get_icon() {

		// GF only has icons in 2.5+
		if ( ! gravityview()->plugin->is_GF_25() ) {
			return $this->icon;
		}

		// If the field doesn't have an associated GF field class, return the default icon.
		if ( empty( $this->_gf_field_class_name ) || ! class_exists( $this->_gf_field_class_name ) ) {
			return $this->icon;
		}

		/** @var GF_Field $gf_field */
		$gf_field = GF_Fields::get( $this->name );

		// If the field exists and is a GF_Field, return the icon.
		if ( $gf_field && $gf_field instanceof GF_Field ) {
			$icon = $gf_field->get_form_editor_field_icon();
			if ( 'gform-icon--cog' !== $icon ) {
				return $icon;
			}
		}

		return $this->icon;
	}

	/**
	 * Add the field to the Filter & Sort available fields
	 *
	 * @since 1.19
	 *
	 * @param array $fields Sub-set of GF form fields that are sortable
	 *
	 * @return array Modified $fields array to include approval status in the sorting dropdown
	 */
	public function add_sortable_field( $fields ) {

		$added_field = array(
			'label' => $this->label,
			'type'  => $this->name,
		);

		$fields[ "{$this->entry_meta_key}" ] = $added_field;

		return $fields;
	}

	/**
	 * Allow setting a default search label for search fields based on the field type
	 *
	 * Useful for entry meta "fields" that don't have Gravity Forms labels, like `created_by`
	 *
	 * @since 1.17.3
	 *
	 * @param string $label Existing label text, sanitized.
	 * @param array  $gf_field Gravity Forms field array, as returned by `GFFormsModel::get_field()`
	 * @param array  $field Field setting as sent by the GV configuration - has `field`, `input` (input type), and `label` keys
	 *
	 * @return string
	 */
	function set_default_search_label( $label = '', $gf_field = null, $field = array() ) {

		if ( $this->name === $field['field'] && '' === $label ) {
			$label = esc_html( $this->default_search_label );
		}

		return $label;
	}

	/**
	 * Match the merge tag in replacement text for the field.  DO NOT OVERRIDE.
	 *
	 * @see replace_merge_tag Override replace_merge_tag() to handle any matches
	 *
	 * @since 1.16
	 *
	 * @param string $text Text to replace
	 * @param array  $form Gravity Forms form array
	 * @param array  $entry Entry array
	 * @param bool   $url_encode Whether to URL-encode output
	 *
	 * @return string Original text if {_custom_merge_tag} isn't found. Otherwise, replaced text.
	 */
	public function _filter_gform_replace_merge_tags( $text, $form = array(), $entry = array(), $url_encode = false, $esc_html = false ) {

		if ( ! is_string( $text ) ) {
			return $text;
		}

		// Is there is field merge tag? Strip whitespace off the ned, too.
		preg_match_all( '/{' . preg_quote( $this->_custom_merge_tag, '/' ) . ':?(.*?)(?:\s)?}/ism', $text, $matches, PREG_SET_ORDER );

		// If there are no matches, return original text
		if ( empty( $matches ) ) {
			return $text;
		}

		return $this->replace_merge_tag( $matches, $text, $form, $entry, $url_encode, $esc_html );
	}

	/**
	 * Run GravityView filters when using GFCommon::replace_variables()
	 *
	 * Instead of adding multiple hooks, add all hooks into this one method to improve speed
	 *
	 * @since 1.8.4
	 *
	 * @see GFCommon::replace_variables()
	 *
	 * @param array      $matches Array of Merge Tag matches found in text by preg_match_all
	 * @param string     $text Text to replace
	 * @param array|bool $form Gravity Forms form array. When called inside {@see GFCommon::replace_variables()} (now deprecated), `false`
	 * @param array|bool $entry Entry array.  When called inside {@see GFCommon::replace_variables()} (now deprecated), `false`
	 * @param bool       $url_encode Whether to URL-encode output
	 * @param bool       $esc_html Whether to apply `esc_html()` to output
	 *
	 * @return mixed
	 */
	public function replace_merge_tag( $matches = array(), $text = '', $form = array(), $entry = array(), $url_encode = false, $esc_html = false ) {

		foreach ( $matches as $match ) {

			$full_tag = $match[0];

			// Strip the Merge Tags
			$tag = str_replace( array( '{', '}' ), '', $full_tag );

			// Replace the value from the entry, if exists
			if ( isset( $entry[ $tag ] ) ) {

				$value = $entry[ $tag ];

				if ( is_callable( array( $this, 'get_content' ) ) ) {
					$value = $this->get_content( $value );
				}

				$text = str_replace( $full_tag, $value, $text );
			}
		}

		unset( $value, $tag, $full_tag );

		return $text;
	}

	/**
	 * Add custom merge tags to merge tag options. DO NOT OVERRIDE.
	 *
	 * @internal Not to be overridden by fields
	 *
	 * @since 1.8.4
	 *
	 * @param array      $custom_merge_tags
	 * @param int        $form_id GF Form ID
	 * @param GF_Field[] $fields Array of fields in the form
	 * @param string     $element_id The ID of the input that Merge Tags are being used on
	 *
	 * @return array Modified merge tags
	 */
	public function _filter_gform_custom_merge_tags( $custom_merge_tags = array(), $form_id = 0, $fields = array(), $element_id = '' ) {

		$form = GVCommon::get_form( $form_id );

		$field_merge_tags = $this->custom_merge_tags( $form, $fields );

		return array_merge( $custom_merge_tags, $field_merge_tags );
	}

	/**
	 * Add custom Merge Tags to Merge Tag options, if custom Merge Tags exist
	 *
	 * Should be overridden if there's more than one Merge Tag to add or if the Merge Tag isn't {_custom_merge_tag}
	 *
	 * @since 1.16
	 *
	 * @param array      $form GF Form array
	 * @param GF_Field[] $fields Array of fields in the form
	 *
	 * @return array Merge tag array with `label` and `tag` keys based on class `label` and `_custom_merge_tag` variables
	 */
	protected function custom_merge_tags( $form = array(), $fields = array() ) {

		// Use variables to make it unnecessary for other fields to override
		$merge_tags = array(
			array(
				'label' => $this->label,
				'tag'   => '{' . $this->_custom_merge_tag . '}',
			),
		);

		return $merge_tags;
	}

	/**
	 * Use field settings to modify whether a field is sortable
	 *
	 * @see GravityView_frontend::is_field_sortable
	 * @since 1.15.3
	 *
	 * @param array $not_sortable Existing field types that aren't sortable
	 *
	 * @return array
	 */
	public function _filter_sortable_fields( $not_sortable ) {

		if ( ! $this->is_sortable ) {
			$not_sortable[] = $this->name;
		}

		return $not_sortable;
	}

	/**
	 * Add the custom entry meta key to make it searchable and sortable
	 *
	 * @see https://www.gravityhelp.com/documentation/article/gform_entry_meta/
	 *
	 * @param array $entry_meta Array of custom entry meta keys with associative arrays
	 *
	 * @return mixed
	 */
	function add_entry_meta( $entry_meta ) {

		if ( ! isset( $entry_meta[ "{$this->entry_meta_key}" ] ) ) {

			$added_meta = array(
				'label'             => $this->label,
				'is_numeric'        => $this->is_numeric,
				'is_default_column' => $this->entry_meta_is_default_column,
			);

			if ( $this->entry_meta_update_callback && is_callable( $this->entry_meta_update_callback ) ) {
				$added_meta['update_entry_meta_callback'] = $this->entry_meta_update_callback;
			}

			$entry_meta[ "{$this->entry_meta_key}" ] = $added_meta;

		} else {
			gravityview()->log->error(
				'Entry meta already set: {meta_key}',
				array(
					'meta_key' => $this->entry_meta_key,
					'data'     => $entry_meta[ "{$this->entry_meta_key}" ],
				)
			);
		}

		return $entry_meta;
	}

	private function field_support_options() {
		$options = array(
			'link_to_post' => array(
				'type'     => 'checkbox',
				'label'    => __( 'Link to the post', 'gk-gravityview' ),
				'desc'     => __( 'Link to the post created by the entry.', 'gk-gravityview' ),
				'value'    => false,
				'priority' => 1200,
				'group'    => 'display',
				'contexts' => [ 'multiple', 'single', 'edit' ],
			),
			'link_to_term' => array(
				'type'     => 'checkbox',
				'label'    => __( 'Link to the category or tag', 'gk-gravityview' ),
				'desc'     => __( 'Link to the current category or tag. "Link to single entry" must be unchecked.', 'gk-gravityview' ),
				'value'    => false,
				'priority' => 1210,
				'group'    => 'display',
				'contexts' => [ 'multiple', 'single', 'edit' ],
			),
			'dynamic_data' => array(
				'type'     => 'checkbox',
				'label'    => __( 'Use the live post data', 'gk-gravityview' ),
				'desc'     => __( 'Instead of using the entry data, instead use the current post data.', 'gk-gravityview' ),
				'value'    => true,
				'priority' => 1100,
				'group'    => 'display',
				'contexts' => [ 'multiple', 'single', 'edit' ],
			),
			'date_display' => array(
				'type'     => 'text',
				'label'    => __( 'Override Date Format', 'gk-gravityview' ),
				'desc'     => sprintf( __( 'Define how the date is displayed (using %1$sthe PHP date format%2$s)', 'gk-gravityview' ), '<a href="https://wordpress.org/support/article/formatting-date-and-time/" rel="external">', '</a>' ),
				/**
				 * Override the date format with a PHP date format.
				 *
				 * @since 1.0-beta
				 *
				 * @see https://wordpress.org/support/article/formatting-date-and-time/
				 *
				 * @param string|null $date_format Date format string. Default: null.
				 */
				'value'    => apply_filters( 'gravityview_date_format', null ),
				'class'    => 'code widefat',
				'priority' => 1500,
				'group'    => 'display',
			),
			'new_window'   => array(
				'type'     => 'checkbox',
				'label'    => __( 'Open link in a new tab or window?', 'gk-gravityview' ),
				'value'    => false,
				'group'    => 'display',
				'priority' => 1300,
			),
			'lightbox' => array(
				'type' => 'checkbox',
				'label' => __( 'Open in a lightbox?', 'gk-gravityview' ),
				'value' => false,
				'group' => 'display',
				'priority' => 1300,
			),
		);

		/**
		 * Modify the settings that a field supports.
		 *
		 * @since 1.0.7-beta
		 *
		 * @param array $options Multidimensional array with each key being the input name. Each array setting has `type`, `label`, `desc` and `value` (default values) keys.
		 */
		return apply_filters( 'gravityview_field_support_options', $options );
	}

	/**
	 * @param string $key
	 * @param array  $field_options
	 *
	 * @return array
	 */
	function add_field_support( $key, &$field_options ) {

		$options = $this->field_support_options();

		if ( isset( $options[ $key ] ) ) {
			$field_options[ $key ] = $options[ $key ];
		}

		return $field_options;
	}

	/**
	 * Tap in here to modify field options.
	 *
	 * Here's an example:
	 *
	 * <pre>
	 * $field_options['name_display'] = array(
	 *  'type' => 'select',
	 *  'label' => __( 'User Format', 'gravityview' ),
	 *  'desc' => __( 'How should the User information be displayed?', 'gravityview'),
	 *  'choices' => array(
	 *      array(
	 *          'value' => 'display_name',
	 *          'label' => __('Display Name (Example: "Ellen Ripley")', 'gravityview'),
	 *      ),
	 *      array(
	 *          'value' => 'user_login',
	 *          'label' => __('Username (Example: "nostromo")', 'gravityview')
	 *      ),
	 *   'value' => 'display_name'
	 * );
	 * </pre>
	 *
	 * @param  array  $field_options [description]
	 * @param  string $template_id   [description]
	 * @param  string $field_id      [description]
	 * @param  string $context       [description]
	 * @param  string $input_type    [description]
	 * @return array                     [description]
	 */
	public function field_options( $field_options, $template_id, $field_id, $context, $input_type, $form_id ) {
		$this->_field_options = $field_options;
		$this->_field_id      = $field_id;

		return $field_options;
	}

	/**
	 * Check whether the `enableChoiceValue` flag is set for a GF field
	 *
	 * Gets the current form ID, gets the field at that ID, then checks for the enableChoiceValue value.
	 *
	 * @access protected
	 *
	 * @uses GFAPI::get_form
	 *
	 * @since 1.17
	 *
	 * @return bool True: Enable Choice Value is active for field; False: not active, or form invalid, or form not found.
	 */
	protected function is_choice_value_enabled() {

		// If "Add Field" button is processing, get the Form ID
		$connected_form = \GV\Utils::_POST( 'form_id' );

		// Otherwise, get the Form ID from the Post page
		if ( empty( $connected_form ) ) {
			$connected_form = gravityview_get_form_id( get_the_ID() );
		}

		if ( empty( $connected_form ) ) {
			gravityview()->log->error( 'Form not found for form ID "{form_id}"', array( 'form_id' => $connected_form ) );
			return false;
		}

		$form = GVCommon::get_form( $connected_form );

		if ( ! $form ) {
			gravityview()->log->error(
				'Form not found for field ID of "{field_id}", when checking for a form with ID of "{form_id}"',
				array(
					'field_id' => $this->_field_id,
					'form_id'  => $connected_form,
				)
			);
			return false;
		}

		$field = gravityview_get_field( $form, $this->_field_id );

		return ! empty( $field->enableChoiceValue );
	}
}
