// digikala.js
const fetch = require("node-fetch");

/**
 * Search products on Digikala by query
 */
async function searchDigikala(query, limit = 12) {
    if (!query) return [];

    try {
        const encodedQuery = encodeURIComponent(query);
        const url = `https://api.digikala.com/v3/search/?q=${encodedQuery}`;

        const headers = {
            "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36",
            "Accept": "application/json",
            "Accept-Language": "en-US,en;q=0.9,fa;q=0.8"
        };

        const response = await fetch(url, { headers });

        if (!response.ok) {
            console.error(`Digikala API error: ${response.status} ${response.statusText}`);
            return [];
        }

        const data = await response.json();

        if (!data.data || !data.data.products || !Array.isArray(data.data.products)) {
            return [];
        }

        return data.data.products.slice(0, limit).map(item => {
            const title = decodeURIComponent(escape(item.title_fa || item.title || "بدون عنوان"));
            const price = item.default_variant?.price?.selling_price ||
                item.default_variant?.price?.rrp ||
                "—";
            const formattedPrice = price !== "—" ?
                new Intl.NumberFormat('fa-IR').format(price) + " تومان" :
                "—";
            const image = item.images?.main?.url ||
                item.images?.gallery?.[0]?.url ||
                "https://via.placeholder.com/150";
            const link = `https://www.digikala.com${item.url?.uri || ''}`;
            const category = item.category?.title_fa || item.category?.title || "—";
            const description = item.description || item.short_description || "";

            return {
                title,
                category,
                price: formattedPrice,
                image,
                description,
                link
            };
        });
    } catch (err) {
        console.error("Digikala API error:", err.message);
        return [];
    }
}

/**
 * Fetch a single product by its numeric ID
 */
async function getProductById(productId) {
    if (!productId) return null;

    try {
        const url = `https://api.digikala.com/v2/product/${productId}/`;

        const headers = {
            "User-Agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36",
            "Accept": "application/json",
            "Accept-Language": "en-US,en;q=0.9,fa;q=0.8"
        };

        const response = await fetch(url, { headers });

        if (!response.ok) {
            console.error(`Digikala product API error: ${response.status} ${response.statusText}`);
            return null;
        }

        const data = await response.json();

        if (!data.data?.product) {
            console.warn("Product data not found in response");
            return null;
        }

        const product = data.data.product;

        // Title
        const title = product.title_fa || product.title || "بدون عنوان";

        // Image
        const image = product.images?.main?.url || product.images?.gallery?.[0]?.url || "https://via.placeholder.com/150";

        // Description
        const description = product.description || product.short_description || "توضیحاتی موجود نیست.";

        // Price
        let price = "—";
        if (product?.default_variant?.price?.selling_price) {
            price = product.default_variant.price.selling_price;
        } else if (product?.variants?.length > 0 && product.variants[0]?.price?.selling_price) {
            price = product.variants[0].price.selling_price;
        }

        const formattedPrice = price !== "—"
            ? new Intl.NumberFormat('fa-IR').format(price) + " تومان"
            : "—";

        return {
            title,
            image,
            description,
            price: formattedPrice
        };

    } catch (err) {
        console.error("Error fetching product by ID:", err.message);
        return null;
    }
}

module.exports = { searchDigikala, getProductById };