<?php
/**
 * Order Sync to Business Central
 *
 * @package WooBusinessCentral
 */

// Prevent direct access
if ( ! defined( 'ABSPATH' ) ) {
    exit;
}

/**
 * Class WBC_Order_Sync
 *
 * Handles syncing orders from WooCommerce to Business Central.
 */
class WBC_Order_Sync {

    /**
     * Customer sync instance
     *
     * @var WBC_Customer_Sync
     */
    private $customer_sync;

    /**
     * Constructor
     */
    public function __construct() {
        $this->customer_sync = new WBC_Customer_Sync();
    }

    /**
     * Sync an order to Business Central
     *
     * @param int $order_id WooCommerce order ID.
     * @return array|WP_Error Sync result or error.
     */
    public function sync_order( $order_id ) {
        // Check if order sync is enabled
        if ( get_option( 'wbc_enable_order_sync', 'yes' ) !== 'yes' ) {
            return array(
                'success' => false,
                'message' => __( 'Order sync is disabled.', 'woo-business-central' ),
            );
        }

        // Check if credentials are configured
        if ( ! WBC_OAuth::is_configured() ) {
            WBC_Logger::error( 'OrderSync', 'Order sync failed - API credentials not configured', array(
                'order_id' => $order_id,
            ) );
            return new WP_Error( 'wbc_not_configured', __( 'API credentials not configured.', 'woo-business-central' ) );
        }

        // Get the order
        $order = wc_get_order( $order_id );

        if ( ! $order ) {
            return new WP_Error( 'wbc_order_not_found', __( 'Order not found.', 'woo-business-central' ) );
        }

        // Check if order is already synced
        $bc_order_id = $order->get_meta( '_wbc_bc_order_id' );
        if ( ! empty( $bc_order_id ) ) {
            WBC_Logger::debug( 'OrderSync', 'Order already synced', array(
                'order_id'    => $order_id,
                'bc_order_id' => $bc_order_id,
            ) );
            return array(
                'success' => true,
                'message' => __( 'Order already synced to Business Central.', 'woo-business-central' ),
                'bc_order_id' => $bc_order_id,
            );
        }

        // Acquire a lock to prevent duplicate syncs from concurrent hooks
        $lock_key = 'wbc_syncing_order_' . $order_id;
        if ( get_transient( $lock_key ) ) {
            WBC_Logger::debug( 'OrderSync', 'Order sync already in progress', array( 'order_id' => $order_id ) );
            return array(
                'success' => true,
                'message' => __( 'Order sync already in progress.', 'woo-business-central' ),
            );
        }
        set_transient( $lock_key, true, 120 );

        WBC_Logger::info( 'OrderSync', 'Starting order sync', array( 'order_id' => $order_id ) );

        // Step 1: Get or create customer in BC
        $customer_number = $this->customer_sync->get_or_create_customer( $order );

        if ( is_wp_error( $customer_number ) ) {
            $this->add_order_note( $order, sprintf(
                __( 'Failed to sync customer to Business Central: %s', 'woo-business-central' ),
                $customer_number->get_error_message()
            ) );
            return $customer_number;
        }

        // Step 2: Create sales order in BC
        $sales_order = $this->create_sales_order( $order, $customer_number );

        if ( is_wp_error( $sales_order ) ) {
            $this->add_order_note( $order, sprintf(
                __( 'Failed to create sales order in Business Central: %s', 'woo-business-central' ),
                $sales_order->get_error_message()
            ) );
            return $sales_order;
        }

        $bc_order_id = $sales_order['id'];
        $bc_order_number = $sales_order['number'] ?? '';

        // Step 3: Add sales order lines
        $lines_result = $this->create_sales_order_lines( $order, $bc_order_id );

        if ( is_wp_error( $lines_result ) ) {
            // Log the error but don't fail completely
            WBC_Logger::warning( 'OrderSync', 'Some order lines failed to sync', array(
                'order_id'    => $order_id,
                'bc_order_id' => $bc_order_id,
                'error'       => $lines_result->get_error_message(),
            ) );
        }

        // Step 3b: Release the sales order if enabled
        if ( get_option( 'wbc_auto_release_order', 'no' ) === 'yes' ) {
            $release_result = $this->release_sales_order( $bc_order_id );

            if ( is_wp_error( $release_result ) ) {
                WBC_Logger::warning( 'OrderSync', 'Failed to release sales order', array(
                    'order_id'    => $order_id,
                    'bc_order_id' => $bc_order_id,
                    'error'       => $release_result->get_error_message(),
                ) );
                $this->add_order_note( $order, sprintf(
                    __( 'Order created in BC but failed to release: %s', 'woo-business-central' ),
                    $release_result->get_error_message()
                ) );
            } else {
                WBC_Logger::info( 'OrderSync', 'Sales order released', array(
                    'bc_order_id' => $bc_order_id,
                ) );
            }
        }

        // Step 4: Save BC order ID to WC order meta
        $order->update_meta_data( '_wbc_bc_order_id', $bc_order_id );
        $order->update_meta_data( '_wbc_bc_order_number', $bc_order_number );
        $order->update_meta_data( '_wbc_synced_at', current_time( 'mysql' ) );
        $order->save();

        // Add order note
        $this->add_order_note( $order, sprintf(
            __( 'Order synced to Business Central. BC Order Number: %s', 'woo-business-central' ),
            $bc_order_number
        ) );

        // Release the sync lock
        delete_transient( 'wbc_syncing_order_' . $order_id );

        WBC_Logger::info( 'OrderSync', 'Order sync completed', array(
            'order_id'        => $order_id,
            'bc_order_id'     => $bc_order_id,
            'bc_order_number' => $bc_order_number,
        ) );

        return array(
            'success'         => true,
            'message'         => __( 'Order synced to Business Central.', 'woo-business-central' ),
            'bc_order_id'     => $bc_order_id,
            'bc_order_number' => $bc_order_number,
        );
    }

    /**
     * Create sales order in BC
     *
     * @param WC_Order $order           WooCommerce order.
     * @param string   $customer_number BC customer number.
     * @return array|WP_Error Created sales order or error.
     */
    private function create_sales_order( $order, $customer_number ) {
        $order_data = array(
            'customerNumber'         => $customer_number,
            'orderDate'              => $order->get_date_created()->format( 'Y-m-d' ),
            'externalDocumentNumber' => $order->get_order_number(),
            'currencyCode'           => $order->get_currency(),
        );

        // Add payment terms if configured
        $payment_terms_id = get_option( 'wbc_default_payment_terms_id', '' );
        if ( ! empty( $payment_terms_id ) ) {
            $order_data['paymentTermsId'] = $payment_terms_id;
        }

        // Add shipment method if configured
        $shipment_method_id = get_option( 'wbc_default_shipment_method_id', '' );
        if ( ! empty( $shipment_method_id ) ) {
            $order_data['shipmentMethodId'] = $shipment_method_id;
        }

        // Add shipping address if different from billing
        $shipping_address_1 = $order->get_shipping_address_1();
        if ( ! empty( $shipping_address_1 ) ) {
            $order_data['shipToName'] = trim( $order->get_shipping_first_name() . ' ' . $order->get_shipping_last_name() );
            $order_data['shipToAddressLine1'] = $shipping_address_1;
            $order_data['shipToCity'] = $order->get_shipping_city();
            $order_data['shipToState'] = $order->get_shipping_state();
            $order_data['shipToPostCode'] = $order->get_shipping_postcode();
            $order_data['shipToCountry'] = $order->get_shipping_country();
        }

        WBC_Logger::debug( 'OrderSync', 'Creating sales order in BC', array(
            'order_id' => $order->get_id(),
            'data'     => $order_data,
        ) );

        return WBC_API_Client::create_sales_order( $order_data );
    }

    /**
     * Create sales order lines in BC
     *
     * @param WC_Order $order       WooCommerce order.
     * @param string   $bc_order_id BC sales order ID.
     * @return true|WP_Error True on success or error.
     */
    private function create_sales_order_lines( $order, $bc_order_id ) {
        $errors = array();
        $items = $order->get_items();
        $location_code = get_option( 'wbc_location_code', '' );

        foreach ( $items as $item_id => $item ) {
            $product = $item->get_product();

            if ( ! $product ) {
                WBC_Logger::warning( 'OrderSync', 'Skipping order line - product not found', array(
                    'order_id' => $order->get_id(),
                    'item_id'  => $item_id,
                ) );
                continue;
            }

            // Get the BC item number (use SKU)
            $bc_item_number = $product->get_sku();

            if ( empty( $bc_item_number ) ) {
                WBC_Logger::warning( 'OrderSync', 'Skipping order line - product has no SKU', array(
                    'order_id'   => $order->get_id(),
                    'product_id' => $product->get_id(),
                ) );
                $errors[] = sprintf( 'Product "%s" has no SKU', $product->get_name() );
                continue;
            }

            // Build line data
            $line_data = array(
                'lineType'         => 'Item',
                'lineObjectNumber' => $bc_item_number,
                'quantity'         => $item->get_quantity(),
                'unitPrice'        => (float) $order->get_item_total( $item, false, false ),
            );

            if ( ! empty( $location_code ) ) {
                $line_data['locationCode'] = $location_code;
            }

            // Add description if different from product name
            $line_description = $item->get_name();
            if ( ! empty( $line_description ) ) {
                $line_data['description'] = substr( $line_description, 0, 100 );
            }

            WBC_Logger::debug( 'OrderSync', 'Creating sales order line', array(
                'bc_order_id' => $bc_order_id,
                'data'        => $line_data,
            ) );

            $result = WBC_API_Client::create_sales_order_line( $bc_order_id, $line_data );

            if ( is_wp_error( $result ) ) {
                WBC_Logger::error( 'OrderSync', 'Failed to create sales order line', array(
                    'bc_order_id'    => $bc_order_id,
                    'bc_item_number' => $bc_item_number,
                    'error'          => $result->get_error_message(),
                ) );
                $errors[] = sprintf( 'Item %s: %s', $bc_item_number, $result->get_error_message() );
            }
        }

        // Handle shipping as a line item if there's shipping cost
        $shipping_total = (float) $order->get_shipping_total();
        if ( $shipping_total > 0 ) {
            $shipping_item_number = get_option( 'wbc_shipping_item_number', '' );

            if ( ! empty( $shipping_item_number ) ) {
                $shipping_line = array(
                    'lineType'         => 'Item',
                    'lineObjectNumber' => $shipping_item_number,
                    'quantity'         => 1,
                    'unitPrice'        => $shipping_total,
                    'description'      => __( 'Shipping', 'woo-business-central' ),
                );

                if ( ! empty( $location_code ) ) {
                    $shipping_line['locationCode'] = $location_code;
                }

                $result = WBC_API_Client::create_sales_order_line( $bc_order_id, $shipping_line );

                if ( is_wp_error( $result ) ) {
                    WBC_Logger::warning( 'OrderSync', 'Failed to add shipping line', array(
                        'bc_order_id' => $bc_order_id,
                        'error'       => $result->get_error_message(),
                    ) );
                }
            }
        }

        if ( ! empty( $errors ) ) {
            return new WP_Error( 'wbc_line_errors', implode( '; ', $errors ) );
        }

        return true;
    }

    /**
     * Release a sales order in BC (change status from Draft to Released)
     *
     * @param string $bc_order_id BC sales order ID.
     * @return array|WP_Error Updated order or error.
     */
    private function release_sales_order( $bc_order_id ) {
        return WBC_API_Client::patch(
            '/salesOrders(' . $bc_order_id . ')',
            array( 'status' => 'Released' )
        );
    }

    /**
     * Add order note
     *
     * @param WC_Order $order   WooCommerce order.
     * @param string   $message Note message.
     */
    private function add_order_note( $order, $message ) {
        $order->add_order_note( '[WBC] ' . $message );
    }

    /**
     * Manual sync for an order (callable from admin)
     *
     * @param int $order_id WooCommerce order ID.
     * @return array Sync result.
     */
    public function manual_sync( $order_id ) {
        $order = wc_get_order( $order_id );

        if ( ! $order ) {
            return array(
                'success' => false,
                'message' => __( 'Order not found.', 'woo-business-central' ),
            );
        }

        // Clear existing sync data to force re-sync
        $order->delete_meta_data( '_wbc_bc_order_id' );
        $order->delete_meta_data( '_wbc_bc_order_number' );
        $order->save();

        return $this->sync_order( $order_id );
    }
}