<?php
/**
 * REST API Product Attributes controller
 *
 * Handles requests to the products/attributes endpoint.
 *
 * @author   WooThemes
 * @category API
 * @package  WooCommerce/API
 * @since    2.6.0
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * REST API Product Attributes controller class.
 *
 * @package WooCommerce/API
 * @extends WC_REST_Controller
 */
class WC_REST_Product_Attributes_Controller extends WC_REST_Controller {

	/**
	 * Endpoint namespace.
	 *
	 * @var string
	 */
	protected $namespace = 'wc/v1';

	/**
	 * Route base.
	 *
	 * @var string
	 */
	protected $rest_base = 'products/attributes';

	/**
	 * Attribute name.
	 *
	 * @var string
	 */
	protected $attribute = '';

	/**
	 * Register the routes for product attributes.
	 */
	public function register_routes() {
		register_rest_route( $this->namespace, '/' . $this->rest_base, array(
			array(
				'methods'             => WP_REST_Server::READABLE,
				'callback'            => array( $this, 'get_items' ),
				'permission_callback' => array( $this, 'get_items_permissions_check' ),
				'args'                => $this->get_collection_params(),
			),
			array(
				'methods'             => WP_REST_Server::CREATABLE,
				'callback'            => array( $this, 'create_item' ),
				'permission_callback' => array( $this, 'create_item_permissions_check' ),
				'args'                => array_merge( $this->get_endpoint_args_for_item_schema( WP_REST_Server::CREATABLE ), array(
					'name' => array(
						'required' => true,
					),
				) ),
			),
			'schema' => array( $this, 'get_public_item_schema' ),
		));

		register_rest_route( $this->namespace, '/' . $this->rest_base . '/(?P<id>[\d]+)', array(
			array(
				'methods'             => WP_REST_Server::READABLE,
				'callback'            => array( $this, 'get_item' ),
				'permission_callback' => array( $this, 'get_item_permissions_check' ),
				'args'                => array(
					'context'         => $this->get_context_param( array( 'default' => 'view' ) ),
				),
			),
			array(
				'methods'             => WP_REST_Server::EDITABLE,
				'callback'            => array( $this, 'update_item' ),
				'permission_callback' => array( $this, 'update_item_permissions_check' ),
				'args'                => $this->get_endpoint_args_for_item_schema( WP_REST_Server::EDITABLE ),
			),
			array(
				'methods'             => WP_REST_Server::DELETABLE,
				'callback'            => array( $this, 'delete_item' ),
				'permission_callback' => array( $this, 'delete_item_permissions_check' ),
				'args'                => array(
					'force' => array(
						'default'     => false,
						'description' => __( 'Required to be true, as resource does not support trashing.', 'woocommerce' ),
					),
				),
			),
			'schema' => array( $this, 'get_public_item_schema' ),
		) );

		register_rest_route( $this->namespace, '/' . $this->rest_base . '/batch', array(
			array(
				'methods'             => WP_REST_Server::EDITABLE,
				'callback'            => array( $this, 'batch_items' ),
				'permission_callback' => array( $this, 'batch_items_permissions_check' ),
				'args'                => $this->get_endpoint_args_for_item_schema( WP_REST_Server::EDITABLE ),
			),
			'schema' => array( $this, 'get_public_batch_schema' ),
		) );
	}

	/**
	 * Check if a given request has access to read the attributes.
	 *
	 * @param  WP_REST_Request $request Full details about the request.
	 * @return WP_Error|boolean
	 */
	public function get_items_permissions_check( $request ) {
		if ( ! wc_rest_check_manager_permissions( 'attributes', 'read' ) ) {
			return new WP_Error( 'woocommerce_rest_cannot_view', __( 'Sorry, you cannot list resources.', 'woocommerce' ), array( 'status' => rest_authorization_required_code() ) );
		}

		return true;
	}

	/**
	 * Check if a given request has access to create a attribute.
	 *
	 * @param  WP_REST_Request $request Full details about the request.
	 * @return WP_Error|boolean
	 */
	public function create_item_permissions_check( $request ) {
		if ( ! wc_rest_check_manager_permissions( 'attributes', 'create' ) ) {
			return new WP_Error( 'woocommerce_rest_cannot_create', __( 'Sorry, you cannot create new resource.', 'woocommerce' ), array( 'status' => rest_authorization_required_code() ) );
		}

		return true;
	}

	/**
	 * Check if a given request has access to read a attribute.
	 *
	 * @param  WP_REST_Request $request Full details about the request.
	 * @return WP_Error|boolean
	 */
	public function get_item_permissions_check( $request ) {
		if ( ! $this->get_taxonomy( $request ) ) {
			return new WP_Error( "woocommerce_rest_taxonomy_invalid", __( "Resource doesn't exist.", 'woocommerce' ), array( 'status' => 404 ) );
		}

		if ( ! wc_rest_check_manager_permissions( 'attributes', 'read' ) ) {
			return new WP_Error( 'woocommerce_rest_cannot_view', __( 'Sorry, you cannot view this resource', 'woocommerce' ), array( 'status' => rest_authorization_required_code() ) );
		}

		return true;
	}

	/**
	 * Check if a given request has access to update a attribute.
	 *
	 * @param  WP_REST_Request $request Full details about the request.
	 * @return WP_Error|boolean
	 */
	public function update_item_permissions_check( $request ) {
		if ( ! $this->get_taxonomy( $request ) ) {
			return new WP_Error( "woocommerce_rest_taxonomy_invalid", __( "Resource doesn't exist.", 'woocommerce' ), array( 'status' => 404 ) );
		}

		if ( ! wc_rest_check_manager_permissions( 'attributes', 'edit' ) ) {
			return new WP_Error( 'woocommerce_rest_cannot_update', __( 'Sorry, you cannot update resource.', 'woocommerce' ), array( 'status' => rest_authorization_required_code() ) );
		}

		return true;
	}

	/**
	 * Check if a given request has access to delete a attribute.
	 *
	 * @param  WP_REST_Request $request Full details about the request.
	 * @return WP_Error|boolean
	 */
	public function delete_item_permissions_check( $request ) {
		if ( ! $this->get_taxonomy( $request ) ) {
			return new WP_Error( "woocommerce_rest_taxonomy_invalid", __( "Resource doesn't exist.", 'woocommerce' ), array( 'status' => 404 ) );
		}

		if ( ! wc_rest_check_manager_permissions( 'attributes', 'delete' ) ) {
			return new WP_Error( 'woocommerce_rest_cannot_delete', __( 'Sorry, you cannot delete resource.', 'woocommerce' ), array( 'status' => rest_authorization_required_code() ) );
		}

		return true;
	}

	/**
	 * Check if a given request has access batch create, update and delete items.
	 *
	 * @param  WP_REST_Request $request Full details about the request.
	 * @return boolean
	 */
	public function batch_items_permissions_check( $request ) {
		if ( ! wc_rest_check_manager_permissions( 'attributes', 'batch' ) ) {
			return new WP_Error( 'woocommerce_rest_cannot_batch', __( 'Sorry, you are not allowed to manipule this resource.', 'woocommerce' ), array( 'status' => rest_authorization_required_code() ) );
		}

		return true;
	}

	/**
	 * Get all attributes.
	 *
	 * @param WP_REST_Request $request
	 * @return array
	 */
	public function get_items( $request ) {
		$attributes = wc_get_attribute_taxonomies();
		$data       = array();
		foreach ( $attributes as $attribute_obj ) {
			$attribute = $this->prepare_item_for_response( $attribute_obj, $request );
			$attribute = $this->prepare_response_for_collection( $attribute );
			$data[] = $attribute;
		}

		return rest_ensure_response( $data );
	}

	/**
	 * Create a single attribute.
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return WP_REST_Request|WP_Error
	 */
	public function create_item( $request ) {
		global $wpdb;

		$args = array(
			'attribute_label'   => $request['name'],
			'attribute_name'    => $request['slug'],
			'attribute_type'    => ! empty( $request['type'] ) ? $request['type'] : 'select',
			'attribute_orderby' => ! empty( $request['order_by'] ) ? $request['order_by'] : 'menu_order',
			'attribute_public'  => true === $request['has_archives'],
		);

		// Set the attribute slug.
		if ( empty( $args['attribute_name'] ) ) {
			$args['attribute_name'] = wc_sanitize_taxonomy_name( stripslashes( $args['attribute_label'] ) );
		} else {
			$args['attribute_name'] = preg_replace( '/^pa\_/', '', wc_sanitize_taxonomy_name( stripslashes( $args['attribute_name'] ) ) );
		}

		$valid_slug = $this->validate_attribute_slug( $args['attribute_name'], true );
		if ( is_wp_error( $valid_slug ) ) {
			return $valid_slug;
		}

		$insert = $wpdb->insert(
			$wpdb->prefix . 'woocommerce_attribute_taxonomies',
			$args,
			array( '%s', '%s', '%s', '%s', '%d' )
		);

		// Checks for errors.
		if ( is_wp_error( $insert ) ) {
			return new WP_Error( 'woocommerce_rest_cannot_create', $insert->get_error_message(), array( 'status' => 400 ) );
		}

		$attribute = $this->get_attribute( $wpdb->insert_id );

		if ( is_wp_error( $attribute ) ) {
			return $attribute;
		}

		$this->update_additional_fields_for_object( $attribute, $request );

		/**
		 * Fires after a single product attribute is created or updated via the REST API.
		 *
		 * @param stdObject       $attribute Inserted attribute object.
		 * @param WP_REST_Request $request   Request object.
		 * @param boolean         $creating  True when creating attribute, false when updating.
		 */
		do_action( 'woocommerce_rest_insert_product_attribute', $attribute, $request, true );

		$request->set_param( 'context', 'edit' );
		$response = $this->prepare_item_for_response( $attribute, $request );
		$response = rest_ensure_response( $response );
		$response->set_status( 201 );
		$response->header( 'Location', rest_url( '/' . $this->namespace . '/' . $this->rest_base . '/' . $attribute->attribute_id ) );

		// Clear transients.
		flush_rewrite_rules();
		delete_transient( 'wc_attribute_taxonomies' );

		return $response;
	}

	/**
	 * Get a single attribute.
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return WP_REST_Request|WP_Error
	 */
	public function get_item( $request ) {
		global $wpdb;

		$attribute = $this->get_attribute( $request['id'] );

		if ( is_wp_error( $attribute ) ) {
			return $attribute;
		}

		$response = $this->prepare_item_for_response( $attribute, $request );

		return rest_ensure_response( $response );
	}

	/**
	 * Update a single term from a taxonomy.
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return WP_REST_Request|WP_Error
	 */
	public function update_item( $request ) {
		global $wpdb;

		$id     = (int) $request['id'];
		$format = array( '%s', '%s', '%s', '%s', '%d' );
		$args   = array(
			'attribute_label'   => $request['name'],
			'attribute_name'    => $request['slug'],
			'attribute_type'    => $request['type'],
			'attribute_orderby' => $request['order_by'],
			'attribute_public'  => $request['has_archives'],
		);

		$i = 0;
		foreach ( $args as $key => $value ) {
			if ( empty( $value ) && ! is_bool( $value ) ) {
				unset( $args[ $key ] );
				unset( $format[ $i ] );
			}

			$i++;
		}

		// Set the attribute slug.
		if ( ! empty( $args['attribute_name'] ) ) {
			$args['attribute_name'] = preg_replace( '/^pa\_/', '', wc_sanitize_taxonomy_name( stripslashes( $args['attribute_name'] ) ) );

			$valid_slug = $this->validate_attribute_slug( $args['attribute_name'], true );
			if ( is_wp_error( $valid_slug ) ) {
				return $valid_slug;
			}
		}

		$update = $wpdb->update(
			$wpdb->prefix . 'woocommerce_attribute_taxonomies',
			$args,
			array( 'attribute_id' => $id ),
			$format,
			array( '%d' )
		);

		// Checks for errors.
		if ( false === $update ) {
			return new WP_Error( 'woocommerce_rest_cannot_edit', __( 'Could not edit the attribute', 'woocommerce' ), array( 'status' => 400 ) );
		}

		$attribute = $this->get_attribute( $id );

		if ( is_wp_error( $attribute ) ) {
			return $attribute;
		}

		$this->update_additional_fields_for_object( $attribute, $request );

		/**
		 * Fires after a single product attribute is created or updated via the REST API.
		 *
		 * @param stdObject       $attribute Inserted attribute object.
		 * @param WP_REST_Request $request   Request object.
		 * @param boolean         $creating  True when creating attribute, false when updating.
		 */
		do_action( 'woocommerce_rest_insert_product_attribute', $attribute, $request, false );

		$request->set_param( 'context', 'edit' );
		$response = $this->prepare_item_for_response( $attribute, $request );

		// Clear transients.
		flush_rewrite_rules();
		delete_transient( 'wc_attribute_taxonomies' );

		return rest_ensure_response( $response );
	}

	/**
	 * Delete a single attribute.
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return WP_REST_Response|WP_Error
	 */
	public function delete_item( $request ) {
		global $wpdb;

		$force = isset( $request['force'] ) ? (bool) $request['force'] : false;

		// We don't support trashing for this type, error out.
		if ( ! $force ) {
			return new WP_Error( 'woocommerce_rest_trash_not_supported', __( 'Resource does not support trashing.', 'woocommerce' ), array( 'status' => 501 ) );
		}

		$attribute = $this->get_attribute( $request['id'] );

		if ( is_wp_error( $attribute ) ) {
			return $attribute;
		}

		$request->set_param( 'context', 'edit' );
		$response = $this->prepare_item_for_response( $attribute, $request );

		$deleted = $wpdb->delete(
			$wpdb->prefix . 'woocommerce_attribute_taxonomies',
			array( 'attribute_id' => $attribute->attribute_id ),
			array( '%d' )
		);

		if ( false === $deleted ) {
			return new WP_Error( 'woocommerce_rest_cannot_delete', __( 'The resource cannot be deleted.', 'woocommerce' ), array( 'status' => 500 ) );
		}

		$taxonomy = wc_attribute_taxonomy_name( $attribute->attribute_name );

		if ( taxonomy_exists( $taxonomy ) ) {
			$terms = get_terms( $taxonomy, 'orderby=name&hide_empty=0' );
			foreach ( $terms as $term ) {
				wp_delete_term( $term->term_id, $taxonomy );
			}
		}

		/**
		 * Fires after a single attribute is deleted via the REST API.
		 *
		 * @param stdObject        $attribute     The deleted attribute.
		 * @param WP_REST_Response $response The response data.
		 * @param WP_REST_Request  $request  The request sent to the API.
		 */
		do_action( 'woocommerce_rest_delete_product_attribute', $attribute, $response, $request );

		// Fires woocommerce_attribute_deleted hook.
		do_action( 'woocommerce_attribute_deleted', $attribute->attribute_id, $attribute->attribute_name, $taxonomy );

		// Clear transients.
		flush_rewrite_rules();
		delete_transient( 'wc_attribute_taxonomies' );

		return $response;
	}

	/**
	 * Prepare a single product attribute output for response.
	 *
	 * @param obj $item Term object.
	 * @param WP_REST_Request $request
	 * @return WP_REST_Response $response
	 */
	public function prepare_item_for_response( $item, $request ) {
		$data = array(
			'id'           => (int) $item->attribute_id,
			'name'         => $item->attribute_label,
			'slug'         => wc_attribute_taxonomy_name( $item->attribute_name ),
			'type'         => $item->attribute_type,
			'order_by'     => $item->attribute_orderby,
			'has_archives' => (bool) $item->attribute_public,
		);

		$context = ! empty( $request['context'] ) ? $request['context'] : 'view';
		$data    = $this->add_additional_fields_to_object( $data, $request );
		$data    = $this->filter_response_by_context( $data, $context );

		$response = rest_ensure_response( $data );

		$response->add_links( $this->prepare_links( $item ) );

		/**
		 * Filter a attribute item returned from the API.
		 *
		 * Allows modification of the product attribute data right before it is returned.
		 *
		 * @param WP_REST_Response  $response  The response object.
		 * @param object            $item      The original attribute object.
		 * @param WP_REST_Request   $request   Request used to generate the response.
		 */
		return apply_filters( 'woocommerce_rest_prepare_product_attribute', $response, $item, $request );
	}

	/**
	 * Prepare links for the request.
	 *
	 * @param object $attribute Attribute object.
	 * @param WP_REST_Request $request Full details about the request.
	 * @return array Links for the given attribute.
	 */
	protected function prepare_links( $attribute ) {
		$base  = '/' . $this->namespace . '/' . $this->rest_base;
		$links = array(
			'self' => array(
				'href' => rest_url( trailingslashit( $base ) . $attribute->attribute_id ),
			),
			'collection' => array(
				'href' => rest_url( $base ),
			),
		);

		return $links;
	}

	/**
	 * Get the Attribute's schema, conforming to JSON Schema.
	 *
	 * @return array
	 */
	public function get_item_schema() {
		$schema = array(
			'$schema'              => 'http://json-schema.org/draft-04/schema#',
			'title'                => 'product_attribute',
			'type'                 => 'object',
			'properties'           => array(
				'id' => array(
					'description' => __( 'Unique identifier for the resource.', 'woocommerce' ),
					'type'        => 'integer',
					'context'     => array( 'view', 'edit' ),
					'readonly'    => true,
				),
				'name' => array(
					'description' => __( 'Attribute name.', 'woocommerce' ),
					'type'        => 'string',
					'context'     => array( 'view', 'edit' ),
					'arg_options' => array(
						'sanitize_callback' => 'sanitize_text_field',
					),
				),
				'slug' => array(
					'description' => __( 'An alphanumeric identifier for the resource unique to its type.', 'woocommerce' ),
					'type'        => 'string',
					'context'     => array( 'view', 'edit' ),
					'arg_options' => array(
						'sanitize_callback' => 'sanitize_title',
					),
				),
				'type' => array(
					'description' => __( 'Type of attribute.', 'woocommerce' ),
					'type'        => 'string',
					'default'     => 'select',
					'enum'        => array_keys( wc_get_attribute_types() ),
					'context'     => array( 'view', 'edit' ),
				),
				'order_by' => array(
					'description' => __( 'Default sort order.', 'woocommerce' ),
					'type'        => 'string',
					'default'     => 'menu_order',
					'enum'        => array( 'menu_order', 'name', 'name_num', 'id' ),
					'context'     => array( 'view', 'edit' ),
				),
				'has_archives' => array(
					'description' => __( 'Enable/Disable attribute archives.', 'woocommerce' ),
					'type'        => 'boolean',
					'default'     => false,
					'context'     => array( 'view', 'edit' ),
				),
			),
		);

		return $this->add_additional_fields_schema( $schema );
	}

	/**
	 * Get the query params for collections
	 *
	 * @return array
	 */
	public function get_collection_params() {
		$params = array();
		$params['context'] = $this->get_context_param( array( 'default' => 'view' ) );

		return $params;
	}

	/**
	 * Get attribute name.
	 *
	 * @param WP_REST_Request $request Full details about the request.
	 * @return int|WP_Error
	 */
	protected function get_taxonomy( $request ) {
		if ( '' !== $this->attribute ) {
			return $this->attribute;
		}

		if ( $request['id'] ) {
			$name = wc_attribute_taxonomy_name_by_id( (int) $request['id'] );

			$this->attribute = $name;
		}

		return $this->attribute;
	}

	/**
	 * Get attribute data.
	 *
	 * @param int $id Attribute ID.
	 * @return stdClass|WP_Error
	 */
	protected function get_attribute( $id ) {
		global $wpdb;

		$attribute = $wpdb->get_row( $wpdb->prepare( "
			SELECT *
			FROM {$wpdb->prefix}woocommerce_attribute_taxonomies
			WHERE attribute_id = %d
		 ", $id ) );

		if ( is_wp_error( $attribute ) || is_null( $attribute ) ) {
			return new WP_Error( 'woocommerce_rest_attribute_invalid', __( "Resource doesn't exist.", 'woocommerce' ), array( 'status' => 404 ) );
		}

		return $attribute;
	}

	/**
	 * Validate attribute slug.
	 *
	 * @param string $slug
	 * @param bool $new_data
	 * @return bool|WP_Error
	 */
	protected function validate_attribute_slug( $slug, $new_data = true ) {
		if ( strlen( $slug ) >= 28 ) {
			return new WP_Error( 'woocommerce_rest_invalid_product_attribute_slug_too_long', sprintf( __( 'Slug "%s" is too long (28 characters max).', 'woocommerce' ), $slug ), array( 'status' => 400 ) );
		} elseif ( wc_check_if_attribute_name_is_reserved( $slug ) ) {
			return new WP_Error( 'woocommerce_rest_invalid_product_attribute_slug_reserved_name', sprintf( __( 'Slug "%s" is not allowed because it is a reserved term.', 'woocommerce' ), $slug ), array( 'status' => 400 ) );
		} elseif ( $new_data && taxonomy_exists( wc_attribute_taxonomy_name( $slug ) ) ) {
			return new WP_Error( 'woocommerce_rest_invalid_product_attribute_slug_already_exists', sprintf( __( 'Slug "%s" is already in use.', 'woocommerce' ), $slug ), array( 'status' => 400 ) );
		}

		return true;
	}
}