ists( $payment_method, self::get_direct_debit_methods() );
	}

	/**
	 * Get recurring methods.
	 *
	 * @since 1.3.14
	 * @return array
	 */
	public static function get_recurring_methods() {
		// Get the direct debit methods.
		$payment_methods = self::get_direct_debit_methods();

		// Add additional methods suitable for recurring payments.
		$payment_methods[ self::APPLE_PAY ]   = self::APPLE_PAY;
		$payment_methods[ self::CREDIT_CARD ] = self::CREDIT_CARD;

		return $payment_methods;
	}

	/**
	 * Is recurring method.
	 *
	 * @since 1.3.14
	 *
	 * @param string $payment_method The payment method to check for recurring.
	 *
	 * @return bool True if the specified payment method supports recurring, false otherwise.
	 */
	public static function is_recurring_method( $payment_method ) {
		return array_key_exists( $payment_method, self::get_recurring_methods() );
	}

	/**
	 * Get first method for payment method.
	 *
	 * @param string|null $payment_method The payment method to get the first payment method for.
	 *
	 * @return string|null
	 */
	public static function get_first_payment_method( $payment_method ) {
		if ( empty( $payment_method ) ) {
			return null;
		}

		if ( self::is_direct_debit_method( $payment_method ) ) {
			$direct_debit_methods = self::get_direct_debit_methods();

			return $direct_debit_methods[ $payment_method ];
		}

		return $payment_method;
	}

	/**
	 * Maybe update active payment methods.
	 *
	 * @return void
	 */
	public static function maybe_update_active_payment_methods() {
		$payment_methods = get_option( 'pronamic_pay_active_payment_methods' );

		// Update active payment methods option if necessary.
		if ( ! is_array( $payment_methods ) ) {
			self::update_active_payment_methods();
		}
	}

	/**
	 * Update active payment methods option.
	 *
	 * @since 2.0.0
	 * @return void
	 */
	public static function update_active_payment_methods() {
		$active_payment_methods = array();

		$query = new WP_Query(
			array(
				'post_type' => 'pronamic_gateway',
				'nopaging'  => true,
				'fields'    => 'ids',
			)
		);

		foreach ( $query->posts as $config_id ) {
			$gateway = Plugin::get_gateway( $config_id );

			if ( ! $gateway ) {
				continue;
			}

			if ( ! method_exists( $gateway, 'get_supported_payment_methods' ) ) {
				continue;
			}

			try {
				$payment_methods = $gateway->get_transient_available_payment_methods();
			} catch ( \Exception $e ) {
				// Do not update active payment methods on error.
				return;
			}

			if ( null === $payment_methods ) {
				$payment_methods = $gateway->get_supported_payment_methods();
			}

			foreach ( $payment_methods as $payment_method ) {
				if ( ! isset( $active_payment_methods[ $payment_method ] ) ) {
					$active_payment_methods[ $payment_method ] = array();
				}

				// Check if payment method is supported.
				if ( ! \in_array( $payment_method, $gateway->get_supported_payment_methods(), true ) ) {
					continue;
				}

				$active_payment_methods[ $payment_method ][] = $config_id;
			}
		}

		update_option( 'pronamic_pay_active_payment_methods', $active_payment_methods );
	}

	/**
	 * Get active payment methods.
	 *
	 * @return array
	 */
	public static function get_active_payment_methods() {
		self::maybe_update_active_payment_methods();

		$payment_methods = array();

		$active_methods = get_option( 'pronamic_pay_active_payment_methods' );

		if ( is_array( $active_methods ) ) {
			$payment_methods = array_keys( $active_methods );
		}

		return $payment_methods;
	}

	/**
	 * Get config IDs for payment method.
	 *
	 * @param string $payment_method Payment method.
	 *
	 * @return array
	 */
	public static function get_config_ids( $payment_method = null ) {
		self::maybe_update_active_payment_methods();

		$config_ids = array();

		$active_methods = get_option( 'pronamic_pay_active_payment_methods' );

		// Make sure active payments methods is an array.
		if ( ! is_array( $active_methods ) ) {
			return $config_ids;
		}

		// Get config IDs for payment method.
		if ( isset( $active_methods[ $payment_method ] ) ) {
			$config_ids = $active_methods[ $payment_method ];
		}

		// Get all config IDs if payment method is empty.
		if ( empty( $payment_method ) ) {
			foreach ( $active_methods as $method_config_ids ) {
				$config_ids = array_merge( $config_ids, $method_config_ids );
			}

			$config_ids = array_unique( $config_ids );
		}

		// Make sure payment method is also supported.
		if ( null !== $payment_method ) {
			foreach ( $config_ids as $key => $config_id ) {
				$gateway = Plugin::get_gateway( $config_id );

				if ( null === $gateway || ! \in_array( $payment_method, $gateway->get_supported_payment_methods(), true ) ) {
					unset( $config_ids[ $key ] );
				}
			}
		}

		return $config_ids;
	}

	/**
	 * Check if payment method is active.
	 *
	 * @param string $payment_method Payment method.
	 *
	 * @since 2.0.0
	 *
	 * @return bool
	 */
	public static function is_active( $payment_method = null ) {
		return in_array( $payment_method, self::get_active_payment_methods(), true );
	}
}