<?php
/**
 * WooCommerce Order Step Logging Functions
 *
 * Tracks the steps of the checkout process for place order debugging.
 *
 * @package WooCommerce\Functions
 * @version 9.7.0
 */

declare( strict_types=1 );

defined( 'ABSPATH' ) || exit;

use Automattic\WooCommerce\Internal\BatchProcessing\BatchProcessingController;
use Automattic\WooCommerce\Internal\Logging\OrderLogsDeletionProcessor;
use Automattic\WooCommerce\Utilities\OrderUtil;

/**
 * Log an order-related message. This is not public API and should not be used by plugins or themes.
 *
 * @param string     $message Message to log.
 * @param array|null $context Optional. Additional information for log handlers.
 * @param bool       $final_step Optional. Whether this is the final step of the order logging, and should clear the log.
 * @param bool       $first_step Optional. Whether this is declared the first step in order to start a new log.
 *
 * @internal This function is intended for internal use only.
 * @since 9.9.0
 */
function wc_log_order_step( string $message, ?array $context = null, bool $final_step = false, bool $first_step = false ): void {
	static $logging_active;
	static $order;

	try {
		if ( empty( $message ) ) {
			return; // Nothing to log.
		}

		if ( $first_step ) {
			$logging_active = true;
		}

		if ( ! $logging_active ) {
			return; // Whenever the method is called without a started logging session, it will be ignored.
		}

		static $order_uid, $order_uid_short, $store_url;
		static $steps = array(); // Static array to store the messages and validate against unique messages before clearing the log.

		// Generate a static place order unique ID for logging purposes. When this is called multiple times in the same request,
		// the same UID will be used, enabling us to track recursion and race-condition issues on order processing methods
		// or other problems related to third-party plugins and filters.
		$order_uid       = $order_uid ? $order_uid : wp_generate_uuid4();
		$order_uid_short = $order_uid_short ? $order_uid_short : substr( $order_uid, 0, 8 );
		$store_url       = $store_url ? $store_url : get_site_url();

		$context['order_uid'] = $order_uid;
		$context['source']    = 'place-order-debug-' . $order_uid_short; // Source is segmented per order unique id.
		$context['store_url'] = $store_url;

		// Extract safe data from order object.
		if ( ( $context['order_object'] ?? null ) instanceof WC_Order ) {
			$order   = $context['order_object'];
			$context = array_merge( extract_order_safe_data( $order ), $context );
			unset( $context['order_object'] ); // This is super-important to avoid logging sensitive data.
			$order->add_meta_data( '_debug_log_source', $context['source'], true );
			$order->save();
		}

		// Use the global logger instance which respects site's logging configuration.
		$logger = wc_get_logger();

		if ( ! is_null( error_get_last() ) ) {
			$context['last_error'] = error_get_last();
		}
		$context['backtrace']      = debug_backtrace( DEBUG_BACKTRACE_IGNORE_ARGS, 3 ); // phpcs:ignore WordPress.PHP.DevelopmentFunctions.error_log_debug_backtrace
		$context['remote-logging'] = false; // forcing disable on remote logging.

		$steps[] = $message;
		$logger->log( WC_Log_Levels::DEBUG, $message, $context );

		if ( $final_step ) {
			// Clears the log if instructed and all steps are unique.
			// We'll schedule the deletion for later in order to speed up the checkout process
			// unless a custom (non-Woo core) orders data store is in use, because in that case there's
			// no reliable way to query orders by meta key.
			if ( $order && ( count( array_unique( $steps ) ) === count( $steps ) ) ) {
				$order->delete_meta_data( '_debug_log_source' );
				if ( OrderUtil::unknown_orders_data_store_in_use() ) {
					if ( $logger instanceof WC_Logger ) {
						$logger->clear( $context['source'] );
					}
					$order->save();
				} else {
					$order->add_meta_data( '_debug_log_source_pending_deletion', $context['source'], true );
					$order->save();
					wc_get_container()->get( BatchProcessingController::class )->enqueue_processor( OrderLogsDeletionProcessor::class );
				}
			}

			// Prevent further logging for this request.
			$order          = null;
			$logging_active = false;
			$steps          = array();
		}
	} catch ( Exception $e ) { // phpcs:ignore Generic.CodeAnalysis.EmptyStatement.DetectedCatch
		// Since this runs in a critical path, we need to catch any exceptions and ignore them.
	}
}

/**
 * Extract safe data from order object for debug temporary logging.
 *
 * @param WC_Order $order Order object.
 *
 * @internal This function is intended for internal use only.
 * @since 9.9.0
 */
function extract_order_safe_data( WC_Order $order ) {
	$order_data = array(
		'order_id'       => $order->get_id(),
		'payment_method' => $order->get_payment_method_title(),
		'billing'        => array(
			'country' => $order->get_billing_country(),
			'state'   => $order->get_billing_state(),
		),
		'shipping'       => array(
			'country' => $order->get_shipping_country(),
			'state'   => $order->get_shipping_state(),
		),
		'used_coupons'   => $order->get_coupon_codes(),
		'totals'         => array(
			'subtotal' => $order->get_subtotal(),
			'shipping' => $order->get_shipping_total(),
			'tax'      => $order->get_total_tax(),
			'discount' => $order->get_discount_total(),
			'total'    => $order->get_total(),
		),

	);

	// Add tax breakdown.
	foreach ( $order->get_tax_totals() as $tax ) {
		$order_data['totals']['tax_breakdown'][ $tax->label ] = $tax->amount;
	}

	// Add cart items and quantities.
	foreach ( $order->get_items() as $item_id => $item ) {
		$order_data['cart_items'][] = array(
			'id'           => $item_id,
			'product_id'   => $item->get_product_id(),
			'variation_id' => $item->get_variation_id(),
			'quantity'     => $item->get_quantity(),
		);
	}

	// Add Shipping methods used.
	foreach ( $order->get_shipping_methods() as $method ) {
		$order_data['shipping_methods'][] = array(
			'id'    => $method->get_method_id(),
			'label' => $method->get_method_title(),
		);
	}

	return $order_data;
}