<?php

class WPI_Product_Map
{
    /**
     * Map raw API item → standardized product data
     */
    public static function from_api(
        array $item,
        array $category_map
    ): array {

        return [
            'sku'   => $item['sku'] ?? null,
            'name'  => $item['name'] ?? '',

            'price' => (float) ($item['price'] ?? 0),
            'stock' => (int) ($item['stock'] ?? 0),

            'description'       => $item['description'] ?? '',
            'short_description' => $item['short_description'] ?? '',

            'brand'      => $item['brand'] ?? null,
            'categories' => self::map_categories($item, $category_map),
            'images'     => self::map_images($item),
        ];
    }


    protected static function map_categories(
        array $item,
        array $category_map
    ): array {

        if (empty($item['categories']) || !is_array($item['categories'])) {
            return [];
        }

        $wp_category_ids = [];

        foreach ($item['categories'] as $cat) {
            if (empty($cat['id'])) {
                continue;
            }

            $external_id = (string) $cat['id'];

            // map external id → wp term id
            if (isset($category_map[$external_id])) {
                $wp_category_ids[] = $category_map[$external_id];
            } else {
                // log category chưa map được (rất quan trọng)
                WPI_Logger::log(
                    "[CATEGORY_MAP] Missing category external_id={$external_id} ({$cat['name']})"
                );
            }
        }

        return array_values(array_unique($wp_category_ids));
    }


    protected static function map_images(array $item): array
    {
        if (empty($item['images']) || !is_array($item['images'])) {
            return [];
        }

        $default = [];
        $others  = [];

        foreach ($item['images'] as $img) {
            if (empty($img['url'])) {
                continue;
            }

            if (!empty($img['is_default'])) {
                $default[] = $img['url'];
            } else {
                $others[] = $img['url'];
            }
        }

        // default image lên trước
        return array_merge($default, $others);
    }
}