<?php
/**
 * Template variable renderer.
 *
 * @package IntelTele
 */

namespace IntelTele\Services;

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

final class TemplateRenderer {
	/**
	 * Allowed variables.
	 *
	 * @return string[]
	 */
	public static function allowed_variables(): array {
		return array(
			'{StoresName}',
			'{ClientName}',
			'{ClientLastName}',
			'{OrderStatus}',
			'{AddrOrderDelivery}',
			'{ClientEmail}',
			'{ClientPhone}',
			'{MethodPayment}',
			'{OrderID}',
			'{OrderSum}',
			'{OrderCurrency}',
			'{TTN_Number}',
			'{TrackingURL}',
			'{PaymentURL}',
		);
	}

	/**
	 * Find unknown variables in template text.
	 *
	 * @param string $template Template text.
	 * @return string[]
	 */
	public static function find_unknown_variables( string $template ): array {
		preg_match_all( '/\{[A-Za-z0-9_]+\}/', $template, $matches );

		if ( empty( $matches[0] ) ) {
			return array();
		}

		return array_values( array_diff( array_unique( $matches[0] ), self::allowed_variables() ) );
	}

	/**
	 * Render template for an order.
	 *
	 * @param string $template Template text.
	 * @param mixed  $order WooCommerce order.
	 */
	public function render( string $template, $order ): string {
		return strtr( $template, $this->get_values( $order ) );
	}

	/**
	 * Get variable values for order.
	 *
	 * @param mixed $order WooCommerce order.
	 * @return array<string,string>
	 */
	private function get_values( $order ): array {
		$values = array_fill_keys( self::allowed_variables(), '' );

		if ( ! $order || ! is_object( $order ) ) {
			$values['{StoresName}'] = get_bloginfo( 'name' );
			return $values;
		}

		$ttn = $this->get_ttn_number( $order );

		$values['{StoresName}']        = get_bloginfo( 'name' );
		$values['{ClientName}']        = $this->call_order_getter( $order, 'get_billing_first_name' );
		$values['{ClientLastName}']    = $this->call_order_getter( $order, 'get_billing_last_name' );
		$values['{OrderStatus}']       = $this->get_order_status_label( $order );
		$values['{AddrOrderDelivery}'] = $this->get_order_delivery_address( $order );
		$values['{ClientEmail}']       = $this->call_order_getter( $order, 'get_billing_email' );
		$values['{ClientPhone}']       = $this->call_order_getter( $order, 'get_billing_phone' );
		$values['{MethodPayment}']     = $this->call_order_getter( $order, 'get_payment_method_title' );
		$values['{OrderID}']           = $this->call_order_getter( $order, 'get_id' );
		$values['{OrderSum}']          = $this->call_order_getter( $order, 'get_total' );
		$values['{OrderCurrency}']     = $this->call_order_getter( $order, 'get_currency' );
		$values['{TTN_Number}']        = $ttn;
		$values['{TrackingURL}']       = '' === $ttn ? '' : 'https://novaposhta.ua/tracking/index/cargo_number/' . rawurlencode( $ttn );
		$values['{PaymentURL}']        = $this->call_order_getter( $order, 'get_checkout_payment_url' );

		return $values;
	}

	/**
	 * Call order getter safely.
	 *
	 * @param mixed  $order Order.
	 * @param string $method Method.
	 */
	private function call_order_getter( $order, string $method ): string {
		if ( ! is_object( $order ) || ! method_exists( $order, $method ) ) {
			return '';
		}

		$value = $order->{$method}();

		return is_scalar( $value ) ? (string) $value : '';
	}

	/**
	 * Get localized order status label.
	 *
	 * @param mixed $order Order.
	 */
	private function get_order_status_label( $order ): string {
		$status = $this->call_order_getter( $order, 'get_status' );

		if ( '' === $status ) {
			return '';
		}

		if ( function_exists( 'wc_get_order_status_name' ) ) {
			return wc_get_order_status_name( $status );
		}

		return $status;
	}

	/**
	 * Get delivery address.
	 *
	 * @param mixed $order Order.
	 */
	private function get_order_delivery_address( $order ): string {
		if ( is_object( $order ) && method_exists( $order, 'get_formatted_shipping_address' ) ) {
			$shipping = wp_strip_all_tags( (string) $order->get_formatted_shipping_address() );

			if ( '' !== $shipping ) {
				return $shipping;
			}
		}

		if ( is_object( $order ) && method_exists( $order, 'get_formatted_billing_address' ) ) {
			return wp_strip_all_tags( (string) $order->get_formatted_billing_address() );
		}

		return '';
	}

	/**
	 * Get TTN from supported meta fields.
	 *
	 * @param mixed $order Order.
	 */
	private function get_ttn_number( $order ): string {
		if ( ! is_object( $order ) || ! method_exists( $order, 'get_meta' ) ) {
			return '';
		}

		foreach ( array( '_shipping_ttn', '_novaposhta_consignment_number', '_morkva_shipping_number' ) as $meta_key ) {
			$value = (string) $order->get_meta( $meta_key, true );

			if ( '' !== $value ) {
				return $value;
			}
		}

		return '';
	}
}