<?php
/**
 * REST API Reports customers controller
 *
 * Handles requests to the /reports/customers endpoint.
 *
 * @package WooCommerce Admin/API
 */

defined( 'ABSPATH' ) || exit;

/**
 * REST API Reports customers controller class.
 *
 * @package WooCommerce/API
 * @extends WC_REST_Reports_Controller
 */
class WC_Admin_REST_Reports_Customers_Controller extends WC_REST_Reports_Controller {

	/**
	 * Endpoint namespace.
	 *
	 * @var string
	 */
	protected $namespace = 'wc/v3';

	/**
	 * Route base.
	 *
	 * @var string
	 */
	protected $rest_base = 'reports/customers';

	/**
	 * Maps query arguments from the REST request.
	 *
	 * @param array $request Request array.
	 * @return array
	 */
	protected function prepare_reports_query( $request ) {
		$args                        = array();
		$args['before']              = $request['before'];
		$args['after']               = $request['after'];
		$args['page']                = $request['page'];
		$args['per_page']            = $request['per_page'];
		$args['name']                = $request['name'];
		$args['username']            = $request['username'];
		$args['email']               = $request['email'];
		$args['country']             = $request['country'];
		$args['last_active_before']  = $request['last_active_before'];
		$args['last_active_after']   = $request['last_active_after'];
		$args['order_count_min']     = $request['order_count_min'];
		$args['order_count_max']     = $request['order_count_max'];
		$args['total_spend_min']     = $request['total_spend_min'];
		$args['total_spend_max']     = $request['total_spend_max'];
		$args['avg_order_value_min'] = $request['avg_order_value_min'];
		$args['avg_order_value_max'] = $request['avg_order_value_max'];
		return $args;
	}

	/**
	 * Get all reports.
	 *
	 * @param WP_REST_Request $request Request data.
	 * @return array|WP_Error
	 */
	public function get_items( $request ) {
		$query_args      = $this->prepare_reports_query( $request );
		$customers_query = new WC_Reports_Orders_Stats_Query( $query_args ); // @todo change to correct class.
		$report_data     = $customers_query->get_data();
		$out_data        = array(
			'totals'    => get_object_vars( $report_data->totals ),
			'customers' => array(),
		);
		foreach ( $report_data->customers as $customer_data ) {
			$item_data = $this->prepare_item_for_response( (object) $customer_data, $request );
			$out_data['customers'][] = $item_data;
		}
		$response = rest_ensure_response( $out_data );
		$response->header( 'X-WP-Total', (int) $report_data->total );
		$response->header( 'X-WP-TotalPages', (int) $report_data->pages );
		$page      = $report_data->page_no;
		$max_pages = $report_data->pages;
		$base      = add_query_arg( $request->get_query_params(), rest_url( sprintf( '/%s/%s', $this->namespace, $this->rest_base ) ) );
		if ( $page > 1 ) {
			$prev_page = $page - 1;
			if ( $prev_page > $max_pages ) {
				$prev_page = $max_pages;
			}
			$prev_link = add_query_arg( 'page', $prev_page, $base );
			$response->link_header( 'prev', $prev_link );
		}
		if ( $max_pages > $page ) {
			$next_page = $page + 1;
			$next_link = add_query_arg( 'page', $next_page, $base );
			$response->link_header( 'next', $next_link );
		}
		return $response;
	}

	/**
	 * Prepare a report object for serialization.
	 *
	 * @param stdClass        $report  Report data.
	 * @param WP_REST_Request $request Request object.
	 * @return WP_REST_Response
	 */
	public function prepare_item_for_response( $report, $request ) {
		$data    = get_object_vars( $report );
		$context = ! empty( $request['context'] ) ? $request['context'] : 'view';
		$data    = $this->add_additional_fields_to_object( $data, $request );
		$data    = $this->filter_response_by_context( $data, $context );
		// Wrap the data in a response object.
		$response = rest_ensure_response( $data );
		$response->add_links( $this->prepare_links( $report ) );
		/**
		 * Filter a report returned from the API.
		 *
		 * Allows modification of the report data right before it is returned.
		 *
		 * @param WP_REST_Response $response The response object.
		 * @param object           $report   The original report object.
		 * @param WP_REST_Request  $request  Request used to generate the response.
		 */
		return apply_filters( 'woocommerce_rest_prepare_report_customers', $response, $report, $request );
	}

	/**
	 * Prepare links for the request.
	 *
	 * @param WC_Reports_Query $object Object data.
	 * @return array
	 */
	protected function prepare_links( $object ) {
		$links = array(
			'customer' => array(
				'href' => rest_url( sprintf( '/%s/customers/%d', $this->namespace, $object->customer_id ) ),
			),
		);
		return $links;
	}

	/**
	 * Get the Report's schema, conforming to JSON Schema.
	 *
	 * @return array
	 */
	public function get_item_schema() {
		$schema = array(
			'$schema'    => 'http://json-schema.org/draft-04/schema#',
			'title'      => 'report_customers',
			'type'       => 'object',
			'properties' => array(
				'id'                   => array(
					'description' => __( 'ID.', 'woocommerce' ),
					'type'        => 'integer',
					'context'     => array( 'view', 'edit' ),
					'readonly'    => true,
				),
				'customer_id'          => array(
					'description' => __( 'Customer ID.', 'woocommerce' ),
					'type'        => 'integer',
					'context'     => array( 'view', 'edit' ),
					'readonly'    => true,
				),
				'date_last_active'     => array(
					'description' => __( 'Date last active.', 'woocommerce' ),
					'type'        => 'date-time',
					'context'     => array( 'view', 'edit' ),
					'readonly'    => true,
				),
				'date_last_active_gmt' => array(
					'description' => __( 'Date last active GMT.', 'woocommerce' ),
					'type'        => 'date-time',
					'context'     => array( 'view', 'edit' ),
					'readonly'    => true,
				),
				'orders_count'         => array(
					'description' => __( 'Order count.', 'woocommerce' ),
					'type'        => 'integer',
					'context'     => array( 'view', 'edit' ),
					'readonly'    => true,
				),
				'total_spend'          => array(
					'description' => __( 'Total spend.', 'woocommerce' ),
					'type'        => 'number',
					'context'     => array( 'view', 'edit' ),
					'readonly'    => true,
				),
				'avg_order_value'      => array(
					'description' => __( 'Avg order value.', 'woocommerce' ),
					'type'        => 'number',
					'context'     => array( 'view', 'edit' ),
					'readonly'    => true,
				),
			),
		);
		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' ) );
		$params['before']   = array(
			'description'       => __( 'Limit response to resources published before a given ISO8601 compliant date.', 'woocommerce' ),
			'type'              => 'string',
			'format'            => 'date-time',
			'validate_callback' => 'rest_validate_request_arg',
		);
		$params['after']    = array(
			'description'       => __( 'Limit response to resources published after a given ISO8601 compliant date.', 'woocommerce' ),
			'type'              => 'string',
			'format'            => 'date-time',
			'validate_callback' => 'rest_validate_request_arg',
		);
		$params['page']     = array(
			'description'       => __( 'Current page of the collection.', 'woocommerce' ),
			'type'              => 'integer',
			'default'           => 1,
			'sanitize_callback' => 'absint',
			'validate_callback' => 'rest_validate_request_arg',
			'minimum'           => 1,
		);
		$params['per_page'] = array(
			'description'       => __( 'Maximum number of items to be returned in result set.', 'woocommerce' ),
			'type'              => 'integer',
			'default'           => 10,
			'minimum'           => 1,
			'maximum'           => 100,
			'sanitize_callback' => 'absint',
			'validate_callback' => 'rest_validate_request_arg',
		);
		$params['name']    = array(
			'description'       => __( 'Limit response to objects with a specfic customer name.', 'woocommerce' ),
			'type'              => 'string',
			'validate_callback' => 'rest_validate_request_arg',
		);
		$params['username']    = array(
			'description'       => __( 'Limit response to objects with a specfic username.', 'woocommerce' ),
			'type'              => 'string',
			'validate_callback' => 'rest_validate_request_arg',
		);
		$params['email']    = array(
			'description'       => __( 'Limit response to objects equal to an email.', 'woocommerce' ),
			'type'              => 'string',
			'validate_callback' => 'rest_validate_request_arg',
		);
		$params['country']    = array(
			'description'       => __( 'Limit response to objects with a specfic country.', 'woocommerce' ),
			'type'              => 'string',
			'validate_callback' => 'rest_validate_request_arg',
		);
		$params['last_active_before']    = array(
			'description'       => __( 'Limit response to objects last active before (or at) a given ISO8601 compliant datetime.', 'woocommerce' ),
			'type'              => 'string',
			'format'            => 'date-time',
			'validate_callback' => 'rest_validate_request_arg',
		);
		$params['last_active_after']    = array(
			'description'       => __( 'Limit response to objects last active after (or at) a given ISO8601 compliant datetime.', 'woocommerce' ),
			'type'              => 'string',
			'format'            => 'date-time',
			'validate_callback' => 'rest_validate_request_arg',
		);
		$params['order_count_min']    = array(
			'description'       => __( 'Limit response to objects with an order count greater than or equal to given integer.', 'woocommerce' ),
			'type'              => 'integer',
			'sanitize_callback' => 'absint',
			'validate_callback' => 'rest_validate_request_arg',
		);
		$params['order_count_max']    = array(
			'description'       => __( 'Limit response to objects with an order count less than or equal to given integer.', 'woocommerce' ),
			'type'              => 'integer',
			'sanitize_callback' => 'absint',
			'validate_callback' => 'rest_validate_request_arg',
		);
		$params['total_spend_min']    = array(
			'description'       => __( 'Limit response to objects with a total order spend greater than or equal to given number.', 'woocommerce' ),
			'type'              => 'number',
			'validate_callback' => 'rest_validate_request_arg',
		);
		$params['total_spend_max']    = array(
			'description'       => __( 'Limit response to objects with a total order spend less than or equal to given number.', 'woocommerce' ),
			'type'              => 'number',
			'validate_callback' => 'rest_validate_request_arg',
		);
		$params['avg_order_value_min']    = array(
			'description'       => __( 'Limit response to objects with an average order spend greater than or equal to given number.', 'woocommerce' ),
			'type'              => 'number',
			'validate_callback' => 'rest_validate_request_arg',
		);
		$params['avg_order_value_max']    = array(
			'description'       => __( 'Limit response to objects with an average order spend less than or equal to given number.', 'woocommerce' ),
			'type'              => 'number',
			'validate_callback' => 'rest_validate_request_arg',
		);
		return $params;
	}
}