<?php

/**
 * Fiels group repository
 *
 * Saves field groups from $_POST data
 *
 * It uses legacy code waiting for a refactoring
 *
 * @see Types_Admin_Edit_Custom_Fields_Group
 * @since m2m
 */
class Types_Field_Group_Viewmodel {


	/**
	 * Group types
	 *
	 * @var array
	 * @since m2m
	 */
	private $group_types = array( Toolset_Field_Group_Post::POST_TYPE, Toolset_Field_Group_Term::POST_TYPE, Toolset_Field_Group_User::POST_TYPE );

	/**
	 * Post Field Group
	 *
	 * @var Toolset_Field_Group_Post
	 * @since m2m
	 */
	private $field_group;


	/**
	 * Group. I contains:
	 *		[id]          optional
	 *		[name]        mandatory
	 *		[description] optional
	 *		[supports]    optional The post types, terms or users that have this group.
	 *
	 * @var array
	 * @since m2m
	 */
	private $group;


	/** @var array */
	private $fields;


	/** @var Types_Field_Group_Viewmodel */
	private static $instance;

	/**
	 * Gets new instance
	 *
	 * @param string $group_type The group type related to the Fields Group: posts, users, meta.
	 */
	public static function get_instance( $group_type ) {
		if ( null === self::$instance ) {
			self::$instance = new self( $group_type );
		}
		return self::$instance;
	}


	/**
	 * Constructor
	 *
	 * @param string $group_type The group type related to the Fields Group: posts, users, meta.
	 * @throws InvalidArgumentException If invalid argument.
	 * @since m2m
	 */
	public function __construct( $group_type ) {
		if ( ! in_array( $group_type, $this->group_types, true ) ) {

			throw new InvalidArgumentException( sprintf(
				// translators: a list of allowed group types.
				__( 'Invalid group type. Only valid group types are allowed: (%s)', 'wpcf' ),
				implode( ', ', $this->group_types )
			) );
		}
	}


	/**
	 * Is a valid group type
	 */
	/**
	 * Load $_POST data into the object
	 *
	 * @param array $post_data The $_POST
	 *													 $_POST['wpcf']['group']
	 *													 $this->fields.
	 * @since m2m
	 */
	public function load_data( $post_data ) {
		$this->set_group( $post_data['group'] );
		$fields = isset( $post_data['wpcf']['fields'] )
			? $post_data['wpcf']['fields']
			: null;
		$this->set_fields( $fields );
	}


	/**
	 * Sets group fields
	 *
	 * @param array $fields Fields list from $_POST.
	 * @since m2m
	 */
	public function set_fields( $fields ) {
		$this->fields = $fields;
	}


	/**
	 * Gets fields.
	 *
	 * Useful for testing
	 *
	 * @return array
	 * @since m2m
	 */
	public function get_fields() {
		return $this->fields;
	}


	/**
	 * Sets group and sanitize data
	 *
	 * @param array $group Group name.
	 *                [id]          optional
	 *                [name]        mandatory
	 *                [description] optional
	 *                [supports]    optional The post types, terms or users that have this group.
	 * @throws InvalidArgumentException If invalid argument.
	 * @since m2m
	 */
	public function set_group( $group ) {
		if ( empty( $group['name'] ) ) {
			throw new InvalidArgumentException( __( 'Invalid group name', 'wpcf' ) );
		}
		$this->group = $group;
		if ( isset( $this->group['id'] ) ) {
			$this->group['id'] = (int) $this->group['id'];
		}
		$this->group['name'] = sanitize_text_field( $this->group['name'] );
		if ( isset( $this->group['description'] ) ) {
			$this->group['description'] = sanitize_text_field( $this->group['description'] );
		}
		if ( ! isset( $this->group['purpose'] ) ) {
			$this->group['purpose'] = Toolset_Field_Group_Post::PURPOSE_FOR_INTERMEDIARY_POSTS;
		}
	}


	/**
	 * Gets the group data.
	 *
	 * Useful for testing
	 *
	 * @return array
	 * @since m2m
	 */
	public function get_group() {
		return $this->group;
	}


	/**
	 * Saves the Field group
	 *
	 * @param String $purpose Purpose for the field group.
	 * @since m2m
	 */
	public function save( $purpose ) {
		$this->save_group( $purpose );
		$this->save_group_fields();
		$this->save_group_fields_supports();
		$this->save_condition_templates();
		$this->save_condition_taxonomies();
	}


	/**
	 * Saves or updates the group
	 *
	 * @param String $purpose Field group purpose.
	 * @since m2m
	 */
	private function save_group( $purpose ) {
		$name = sanitize_title( $this->group['name'] );
		$title = sanitize_text_field( $this->group['name'] );
		$field_group = Toolset_Field_Group_Post_Factory::create( $name, $title, 'publish', $purpose );
		if ( $field_group instanceof Toolset_Field_Group_Post ) {
			$this->field_group = $field_group;
		}
	}


	/**
	 * Saves fields group
	 * TODO legacy code
	 *
	 * @throws RuntimeException In case of unexpected error.
	 * @since m2m
	 */
	private function save_group_fields() {
		if ( empty( $this->fields ) ) {
			delete_post_meta( $this->field_group->get_id(), '_wp_types_group_fields' );
			return;
		}
		$fields = array();

		// First check all fields.
		foreach ( $this->fields as $key => $field ) {
			$field = wpcf_sanitize_field( $field );
			$field = apply_filters( 'wpcf_field_pre_save', $field );
			if ( ! empty( $field['is_new'] ) ) {
				// Check name and slug.
				if ( wpcf_types_cf_under_control( 'check_exists', sanitize_title( $field['name'] ) ) ) {
					// translators: a field name.
					throw new RuntimeException( sprintf( __( 'Field with name "%s" already exists', 'wpcf' ), $field['name'] ) );
				}
				if ( isset( $field['slug'] ) && wpcf_types_cf_under_control( 'check_exists', sanitize_title( $field['slug'] ) ) ) {
					// translators: a field slug.
					throw new RuntimeException( sprintf( __( 'Field with slug "%s" already exists', 'wpcf' ), $field['slug'] ) );
				}
			}
			$field['submit-key'] = $key;
			// Field ID and slug are same thing.
			$field_id = wpcf_admin_fields_save_field( $field );
			if ( is_wp_error( $field_id ) ) {
				throw new RuntimeException( $field_id->get_error_message() );
			}
			if ( ! empty( $field_id ) ) {
				$fields[] = $field_id;
			}
			// WPML.
			if (
				defined( 'ICL_SITEPRESS_VERSION' )
				&& function_exists( 'wpml_cf_translation_preferences_store' )
				&& version_compare( ICL_SITEPRESS_VERSION, '3.2', '<' )
			) {
					$real_custom_field_name = wpcf_types_get_meta_prefix( wpcf_admin_fields_get_field( $field_id ) ) . $field_id;
					// @refactoring get rid of the hardcoded dependency
					wpml_cf_translation_preferences_store( $key, $real_custom_field_name );
			}
		}
		wpcf_admin_fields_save_group_fields( $this->field_group->get_id(), $fields );
	}


	/**
	 * Saves field group supports: post types, terms, users attached to the group
	 *
	 * @see wpcf_admin_fields_save_group_post_types
	 * @since m2m
	 */
	private function save_group_fields_supports() {
		$supports = isset( $this->group['supports'] )
			? $this->group['supports']
			: array();
		foreach ( $supports as $post_type ) {
			$this->field_group->assign_post_type( $post_type );
		}
//		wpcf_admin_fields_save_group_post_types( $this->field_group->get_id(), $supports );
	}


	/**
	 * TODO implement
	 */
	private function save_condition_templates() {}

	/**
	 * TODO implement
	 */
	private function save_condition_taxonomies() {}
}