<?php
/**
 * Coupons
 *
 * @package SimplePay\Pro
 * @copyright Copyright (c) 2020, Sandhills Development, LLC
 * @license http://opensource.org/licenses/gpl-2.0.php GNU Public License
 * @since 3.5.0
 */

// Exit if accessed directly.
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

/**
 * Validate a coupon based on Stripe settings.
 *
 * @since 3.5.0
 *
 * @param \Stripe\Coupon $coupon Stripe coupon.
 * @return bool
 */
function simpay_is_coupon_valid( $coupon ) {
	$valid = true;

	// If coupon is not found then exit now.
	if ( false === $coupon ) {
		$valid = false;
	}

	// Generally invalid.
	if ( ! $coupon->valid ) {
		$valid = false;
	}

	// Used too many times.
	if ( $coupon->max_redemptions && ( $coupon->times_redeemed === $coupon->max_redemptions ) ) {
		$valid = false;
	}

	// Expired.
	if ( $coupon->redeem_by && ( time() > $coupon->redeem_by ) ) {
		$valid = false;
	}

	/**
	 * Filter coupon validity.
	 *
	 * @since 3.5.0
	 *
	 * @param bool $valid If the coupon is valid or not.
	 * @param object $coupon Stripe coupon.
	 */
	return apply_filters( 'simpay_is_coupon_valid', $valid, $coupon );
}

/**
 * Creates a translated string for invalid (missing) coupons.
 *
 * Detects $_POST data for coupon validation and filters the localization
 * list to provide a coupon-specific string for the `resource_missing` code.
 *
 * @since 3.9.3
 *
 * @param array $error_list List of error codes and corresponding error messages.
 * @return array $error_list List of error codes and corresponding error messages.
 */
function _simpay_invalid_coupon_localized_error( $error_list ) {
	if ( ! isset( $_POST['coupon'] ) ) {
		return $error_list;
	}

	$error_list['resource_missing'] = __( 'Coupon is invalid. Please try again.', 'simple-pay' );

	return $error_list;
}
add_filter( 'simpay_get_localized_error_list', '_simpay_invalid_coupon_localized_error' );