<?php
/**
 * Validation result.
 *
 * @package Recast\WCS
 */

namespace Recast\WCS\Operation;

defined( 'ABSPATH' ) || exit;

/**
 * Normalised params or a list of field errors.
 */
final class ValidationResult {

	/**
	 * Errors: [{key, message}].
	 *
	 * @var array<int, array{key: string, message: string}>
	 */
	private $errors = array();

	/**
	 * Normalised params.
	 *
	 * @var array<string, mixed>
	 */
	private $params = array();

	/**
	 * Adds an error.
	 *
	 * @param string $key     Field key.
	 * @param string $message Message.
	 * @return void
	 */
	public function add_error( $key, $message ) {
		$this->errors[] = array(
			'key'     => $key,
			'message' => $message,
		);
	}

	/**
	 * Sets params.
	 *
	 * @param array<string, mixed> $params Params.
	 * @return void
	 */
	public function set_params( array $params ) {
		$this->params = $params;
	}

	/**
	 * Whether valid.
	 *
	 * @return bool
	 */
	public function is_valid() {
		return empty( $this->errors );
	}

	/**
	 * Errors.
	 *
	 * @return array<int, array{key: string, message: string}>
	 */
	public function errors() {
		return $this->errors;
	}

	/**
	 * Params.
	 *
	 * @return array<string, mixed>
	 */
	public function params() {
		return $this->params;
	}

	/**
	 * As WP_Error (400) when invalid.
	 *
	 * @return \WP_Error|null
	 */
	public function to_wp_error() {
		if ( $this->is_valid() ) {
			return null;
		}
		$messages = wp_list_pluck( $this->errors, 'message' );
		return new \WP_Error(
			'recast_invalid_params',
			implode( ' ', $messages ),
			array(
				'status' => 400,
				'errors' => $this->errors,
			)
		);
	}
}