<?php

add_action('woocommerce_order_status_changed', function ($order_id, $old, $new, $order) {

    // Chỉ khi chuyển sang completed
    if ($new !== 'completed') {
        return;
    }

    if (!$order instanceof WC_Order) {
        $order = wc_get_order($order_id);
    }
    if (!$order) return;

    $items = [];

    foreach ($order->get_items() as $item_id => $item) {
        /** @var WC_Order_Item_Product $item */
        $product = $item->get_product();

        $items[] = [
            'item_id'        => $item_id,
            'product_id'     => $product ? $product->get_id() : null,
            'variation_id'   => $item->get_variation_id(),
            'type'           => $product ? $product->get_type() : null,
            'name'           => $item->get_name(),
            'sku'            => $product ? $product->get_sku() : null,
            'quantity'       => $item->get_quantity(),

            // Giá
            'subtotal'       => $item->get_subtotal(),
            'total'          => $item->get_total(),
            'tax'            => $item->get_total_tax(),

            // Giá đơn vị
            'price_per_item' => $item->get_quantity() > 0
                ? round($item->get_total() / $item->get_quantity(), 2)
                : 0,

            // Attributes (variation)
            'attributes'     => $item->get_variation_id()
                ? wc_get_formatted_variation($product, true, false, true)
                : null,

            // Meta item
            'item_meta'      => array_map(function ($meta) {
                return [
                    'key'   => $meta->key,
                    'value' => $meta->value,
                ];
            }, $item->get_meta_data()),
        ];
    }

    $log = [
        'event'      => 'order_completed',
        'order_id'   => $order_id,
        'old_status' => $old,
        'new_status' => $new,
        'currency'   => $order->get_currency(),
        'total'      => $order->get_total(),
        'items'      => $items,
    ];

    WPI_Logger::log(json_encode(
        $log,
        JSON_PRETTY_PRINT | JSON_UNESCAPED_UNICODE
    ));
}, 10, 4);