<?php
/**
 * Profit REST controller.
 *
 * @package ProfitEngine
 */

declare( strict_types=1 );

namespace ProfitEngine\Rest\Controllers;

use ProfitEngine\Costing\ReconcileService;
use ProfitEngine\Profit\ProfitService;
use ProfitEngine\Rest\AbstractController;
use WP_REST_Request;
use WP_REST_Response;

defined( 'ABSPATH' ) || exit;

/**
 * Endpoints under /profit-engine/v1/profit — summary, by-product, and backfill control.
 */
class ProfitController extends AbstractController {

	private ProfitService $profit;

	private ReconcileService $reconcile;

	/**
	 * Constructor.
	 *
	 * @param ProfitService    $profit    Profit service.
	 * @param ReconcileService $reconcile Reconcile/backfill service.
	 */
	public function __construct( ProfitService $profit, ReconcileService $reconcile ) {
		$this->profit    = $profit;
		$this->reconcile = $reconcile;
	}

	/**
	 * {@inheritDoc}
	 */
	public function register_routes(): void {
		$range_args = array(
			'range' => array(
				'type'              => 'string',
				'sanitize_callback' => 'sanitize_key',
			),
			'from'  => array(
				'type'              => 'string',
				'sanitize_callback' => 'sanitize_text_field',
			),
			'to'    => array(
				'type'              => 'string',
				'sanitize_callback' => 'sanitize_text_field',
			),
		);

		register_rest_route(
			$this->namespace,
			'/profit',
			array(
				array(
					'methods'             => 'GET',
					'callback'            => array( $this, 'summary' ),
					'permission_callback' => array( $this, 'check_permission' ),
					'args'                => $range_args,
				),
			)
		);

		register_rest_route(
			$this->namespace,
			'/profit/products',
			array(
				array(
					'methods'             => 'GET',
					'callback'            => array( $this, 'by_product' ),
					'permission_callback' => array( $this, 'check_permission' ),
					'args'                => $range_args,
				),
			)
		);

		register_rest_route(
			$this->namespace,
			'/profit/backfill',
			array(
				array(
					'methods'             => 'GET',
					'callback'            => array( $this, 'backfill_state' ),
					'permission_callback' => array( $this, 'check_permission' ),
				),
				array(
					'methods'             => 'POST',
					'callback'            => array( $this, 'backfill_start' ),
					'permission_callback' => array( $this, 'check_permission' ),
					'args'                => array(
						'cutoff' => array(
							'type'              => 'string',
							'sanitize_callback' => 'sanitize_text_field',
						),
					),
				),
				array(
					'methods'             => 'DELETE',
					'callback'            => array( $this, 'backfill_cancel' ),
					'permission_callback' => array( $this, 'check_permission' ),
				),
			)
		);
	}

	/**
	 * GET /profit
	 *
	 * @param WP_REST_Request $request Request.
	 */
	public function summary( WP_REST_Request $request ): WP_REST_Response {
		return new WP_REST_Response( $this->profit->summary( $this->range_args( $request ) ), 200 );
	}

	/**
	 * GET /profit/products
	 *
	 * @param WP_REST_Request $request Request.
	 */
	public function by_product( WP_REST_Request $request ): WP_REST_Response {
		return new WP_REST_Response( $this->profit->by_product( $this->range_args( $request ) ), 200 );
	}

	/**
	 * GET /profit/backfill
	 */
	public function backfill_state(): WP_REST_Response {
		return new WP_REST_Response( $this->reconcile->state(), 200 );
	}

	/**
	 * POST /profit/backfill
	 *
	 * @param WP_REST_Request $request Request.
	 * @return WP_REST_Response|\WP_Error
	 */
	public function backfill_start( WP_REST_Request $request ) {
		$result = $this->reconcile->start( (string) $request->get_param( 'cutoff' ) );
		if ( is_wp_error( $result ) ) {
			return $result;
		}
		return new WP_REST_Response( $result, 202 );
	}

	/**
	 * DELETE /profit/backfill
	 */
	public function backfill_cancel(): WP_REST_Response {
		return new WP_REST_Response( $this->reconcile->cancel(), 200 );
	}

	/**
	 * Extract range args from the request.
	 *
	 * @param WP_REST_Request $request Request.
	 * @return array<string,mixed>
	 */
	private function range_args( WP_REST_Request $request ): array {
		return array(
			'range' => (string) $request->get_param( 'range' ),
			'from'  => (string) $request->get_param( 'from' ),
			'to'    => (string) $request->get_param( 'to' ),
		);
	}
}