<?php
/**
 * Shared email domain policy helpers.
 *
 * @package EthnicInfotech
 */

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

if ( ! function_exists( 'ethnic_email_domain_blocked_suffixes' ) ) {
	function ethnic_email_domain_blocked_suffixes() {
		$suffixes = array(
			'ru',
		);

		$suffixes = array_map(
			static function ( $suffix ) {
				$suffix = is_scalar( $suffix ) ? strtolower( trim( (string) $suffix ) ) : '';
				$suffix = ltrim( $suffix, '.' );

				return preg_replace( '/[^a-z0-9.-]/', '', $suffix );
			},
			$suffixes
		);

		return array_values( array_filter( $suffixes ) );
	}
}

if ( ! function_exists( 'ethnic_email_domain_suffix_is_blocked' ) ) {
	function ethnic_email_domain_suffix_is_blocked( $domain, $suffix ) {
		$domain = strtolower( trim( (string) $domain ) );
		$suffix = strtolower( ltrim( trim( (string) $suffix ), '.' ) );

		if ( '' === $domain || '' === $suffix ) {
			return false;
		}

		if ( $domain === $suffix ) {
			return true;
		}

		$needle = '.' . $suffix;

		if ( strlen( $domain ) <= strlen( $needle ) ) {
			return false;
		}

		return substr( $domain, -strlen( $needle ) ) === $needle;
	}
}

if ( ! function_exists( 'ethnic_email_domain_is_blocked' ) ) {
	function ethnic_email_domain_is_blocked( $email ) {
		$email = sanitize_email( (string) $email );

		if ( '' === $email || false === strpos( $email, '@' ) ) {
			return false;
		}

		$domain = strtolower( trim( substr( strrchr( $email, '@' ), 1 ) ) );

		if ( '' === $domain ) {
			return false;
		}

		foreach ( ethnic_email_domain_blocked_suffixes() as $suffix ) {
			if ( ethnic_email_domain_suffix_is_blocked( $domain, $suffix ) ) {
				return true;
			}
		}

		return false;
	}
}

if ( ! function_exists( 'ethnic_email_domain_is_allowed' ) ) {
	function ethnic_email_domain_is_allowed( $email ) {
		return ! ethnic_email_domain_is_blocked( $email );
	}
}

if ( ! function_exists( 'ethnic_email_domain_block_message' ) ) {
	function ethnic_email_domain_block_message() {
		return 'Email addresses ending in .ru are not allowed. Please use a different business email address.';
	}
}