// basalam.js
const fetch = require("node-fetch"); // نصب با: npm install node-fetch@2

// ساخت URL جستجوی Basalam
function buildUrl(q, from = 0, size =25) {
    const base = "https://services.basalam.com/web/v1/search/product/search";
    const params = new URLSearchParams({
        from: String(from),
        q: q,
        dynamicFacets: "true",
        size: String(size),
        enableNavigations: "true",
        adsImpressionDisable: "false",
        grouped: "true"
    });
    return base + "?" + params.toString();
}

// استخراج آیتم‌ها از JSON پاسخ Basalam
function extractItems(json) {
    const candidates = [
        json?.data?.products,
        json?.data?.items,
        json?.products,
        json?.items,
        json?.hits,
        json?.groups?.flatMap(g => g.items || g.products || []),
        json?.dynamicFacets?.flatMap(f => f.items || [])
    ];
    for (const c of candidates) {
        if (Array.isArray(c) && c.length) return c;
    }
    return [];
}

// نگاشت هر آیتم به ساختار استاندارد
function mapItem(item) {
    const title =
        item.title ||
        item.name ||
        item.displayName ||
        item.productName ||
        item?.payload?.title ||
        "بدون عنوان";

    const image = [
        item?.photo?.MEDIUM,
        item?.photo?.SMALL,
        item?.image_url,
        item?.image,
        item?.media?.[0]?.url,
        item?.thumbnail,
        Array.isArray(item?.images) ? item.images[0] : null
    ].find(src => typeof src === "string" && src.trim().length > 0) || "https://via.placeholder.com/150";

    const price =
        item.price ||
        item.unitPrice ||
        item?.payload?.price ||
        item?.minPrice ||
        (item.prices && item.prices.price);

    const priceText =
        price != null
            ? typeof price === "object"
                ? price.value || JSON.stringify(price)
                : price
            : "—";

    const category = item?.categoryTitle || item?.category || "—";

    return {
        title,
        category,
        price: priceText,
        image,
        description:
            item.description ||
            item.summary ||
            item.details ||
            item.overview ||
            item?.payload?.description ||
            ""
    };
}

// تابع اصلی برای جستجوی Basalam
async function searchBasalam(query, size = 12) {
    if (!query) return [];

    const url = buildUrl(query, 0, size);

    const headers = {
        accept: "application/json, text/plain, */*",
        "accept-language": "en-US,en;q=0.9,fa;q=0.8",
        "x-client-info": JSON.stringify({
            version: "3.38.7",
            project: "charsou",
            name: "web.public",
            platform: "web",
            deviceId: "0e238114-80e2-47b4-89d6-2173f7db9b54",
            sessionId: "da951b95-26f2-4b54-bc17-6c82ec110d80"
        })
    };

    try {
        const resp = await fetch(url, { headers });
        const json = await resp.json();
        const items = extractItems(json).map(mapItem);
        return items;
    } catch (err) {
        console.error("Basalam search error:", err);
        return [];
    }
}

// export تابع
module.exports = { searchBasalam };