<?php
if ( ! defined( 'ABSPATH' ) ) exit;

/**
 * TikTok Bridge: Universal Payload Builder
 * Never forget comments: This class centralizes data formatting for both 
 * single products and full cart payloads to ensure Browser/Server parity.
 */
class PXSYNC_Payload_Data {

    /**
     * Formats data for a single product (ViewContent, AddToCart)
     */
    public static function get_product_payload($product_id) {
        static $cache = [];
        if (isset($cache[$product_id])) return $cache[$product_id];

        $product = wc_get_product($product_id);
        if (!$product) return null;

        $data = [
            'content_type' => 'product',
            'value'        => (float) $product->get_price(),
            'currency'     => get_woocommerce_currency(),
            'contents'     => [[
                'content_id'       => (string) ($product->get_sku() ?: $product->get_id()),
                'content_name'     => $product->get_name(),
                'content_category' => self::get_category_hierarchy($product),
                'quantity'         => 1,
                'price'            => (float) $product->get_price(),
            ]]
        ];

        return $cache[$product_id] = $data;
    }

    /**
     * Formats data for the entire cart (InitiateCheckout)
     */
    public static function get_cart_payload() {
        if (!WC()->cart) return null;

        $cart = WC()->cart;
        $data = [
            'content_type' => 'product',
            'value'        => (float) $cart->get_total('edit'),
            'currency'     => get_woocommerce_currency(),
            'contents'     => []
        ];

        foreach ($cart->get_cart() as $item) {
            $product = $item['data'];
            $data['contents'][] = [
                'content_id'       => (string) ($product->get_sku() ?: ($product->get_id() ?: '')),
                'content_name'     => $product->get_name(),
                'content_category' => self::get_category_hierarchy($product),
                'quantity'         => (int) $item['quantity'],
                'price'            => (float) $product->get_price(),
            ];
        }

        return $data;
    }


    /**
     * Formats data for the final order (CompletePayment)
     */
    public static function get_order_payload($order_id) {
        $order = wc_get_order($order_id);
        if (!$order) return null;

        $data = [
            'content_type' => 'product',
            'value'        => (float) $order->get_total(),
            'currency'     => $order->get_currency(),
            'contents'     => []
        ];

        foreach ($order->get_items() as $item_id => $item) {
            $product = $item->get_product();
            $data['contents'][] = [
                'content_id'   => (string) ($product->get_sku() ?: $product->get_id()),
                'content_name' => $product->get_name(),
                'quantity'     => (int) $item->get_quantity(),
                'price'        => (float) $order->get_item_total($item, false, false),
            ];
        }

        return $data;
    }
    

    /**
     * Helper to get the primary category name
     */
    private static function get_category_hierarchy($product) {
        $terms = get_the_terms($product->get_id(), 'product_cat');
        if ($terms && !is_wp_error($terms)) {
            return $terms[0]->name;
        }
        return 'Uncategorized';
    }
}