import { afterAll, beforeEach, expect, mock, test } from "bun:test";
import { normalizeAsin, searchProductOffers } from "./searxng.ts";

const originalFetch = globalThis.fetch;

beforeEach(() => {
  globalThis.fetch = originalFetch;
});

afterAll(() => {
  globalThis.fetch = originalFetch;
});

test("normalizeAsin uppercases and validates ASINs", () => {
  expect(normalizeAsin(" b07sn9bhvv ")).toBe("B07SN9BHVV");
  expect(normalizeAsin("0306406152")).toBe("0306406152");
  expect(() => normalizeAsin("not-an-asin")).toThrow("Invalid ASIN");
});

test("searchProductOffers derives ASIN search behavior for ASIN-only queries", async () => {
  const fetchMock = mock(async (input: string | URL | Request) => {
    const url = input instanceof URL ? input : new URL(String(input));
    expect(url.pathname).toBe("/search");
    expect(url.searchParams.get("format")).toBe("json");
    expect(url.searchParams.get("q")).toBe("B07SN9BHVV price sale offer buy online");

    return Response.json({
      results: [
        {
          title: "Amazon listing B07SN9BHVV",
          url: "https://www.amazon.com/dp/B07SN9BHVV",
          content: "Official marketplace listing.",
          engines: ["duckduckgo"],
        },
        {
          title: "Romand palette offer",
          url: "https://example-shop.com/item",
          content: "Buy product ASIN B07SN9BHVV. Offer price: $12.99 today.",
          engines: ["brave"],
        },
      ],
    });
  });

  const results = await searchProductOffers("B07SN9BHVV", {
    provider: "searxng",
    baseUrl: "https://searxng.test/",
    fetchImpl: fetchMock as unknown as typeof fetch,
    maxResults: 10,
  });

  expect(results).toHaveLength(2);
  expect(results[0]?.domain).toBe("example-shop.com");
  expect(results[0]?.matchedAsin).toBe("B07SN9BHVV");
  expect(results[0]?.detectedPrice).toBe(12.99);
  expect(results[0]?.detectedPriceCurrency).toBe("USD");
  expect(results[0]?.detectedPriceLabel).toBe("offer price");
  expect(results[0]?.detectedPriceText).toBe("$12.99");
  expect(results[0]?.engines).toEqual(["brave"]);
  expect(fetchMock).toHaveBeenCalledTimes(1);
});

test("searchProductOffers falls back to HTML when JSON is unavailable", async () => {
  const html = `
    <article class="result result-default category-general">
      <a class="url_header" href="https://supplier.example/products/romand"></a>
      <h3><a href="https://supplier.example/products/romand">Supplier offer B07SN9BHVV</a></h3>
      <p class="content">Wholesale product sale price: USD 9.50 with ASIN B07SN9BHVV.</p>
      <div class="engines"><span>duckduckgo</span></div>
    </article>
  `;
  const fetchMock = mock(async (input: string | URL | Request) => {
    const url = input instanceof URL ? input : new URL(String(input));
    if (url.searchParams.get("format") === "json") {
      return new Response("forbidden", { status: 403 });
    }
    return new Response(html, {
      status: 200,
      headers: { "content-type": "text/html" },
    });
  });

  const results = await searchProductOffers("B07SN9BHVV", {
    provider: "searxng",
    baseUrl: "https://searxng.test/",
    fetchImpl: fetchMock as unknown as typeof fetch,
  });

  expect(results).toHaveLength(1);
  expect(results[0]?.title).toBe("Supplier offer B07SN9BHVV");
  expect(results[0]?.domain).toBe("supplier.example");
  expect(results[0]?.detectedPrice).toBe(9.5);
  expect(results[0]?.detectedPriceLabel).toBe("sale price");
  expect(results[0]?.detectedPriceText).toBe("USD 9.50");
  expect(results[0]?.matchedAsin).toBe("B07SN9BHVV");
  expect(results[0]?.engines).toEqual(["duckduckgo"]);
  expect(fetchMock).toHaveBeenCalledTimes(2);
});

test("searchProductOffers detects common selling and sale price formats", async () => {
  const fetchMock = mock(async () =>
    Response.json({
      results: [
        {
          title: "Supplier page",
          url: "https://supplier.example/item",
          content: "Selling price is €18.75 and list price is $24.00.",
        },
        {
          title: "Backup page",
          url: "https://backup.example/item",
          content: "Available now for 22.10 USD.",
        },
      ],
    }),
  );

  const results = await searchProductOffers("romand palette price", {
    provider: "searxng",
    baseUrl: "https://searxng.test/",
    fetchImpl: fetchMock as unknown as typeof fetch,
    maxResults: 2,
  });

  expect(results[0]?.detectedPrice).toBe(18.75);
  expect(results[0]?.detectedPriceCurrency).toBe("EUR");
  expect(results[0]?.detectedPriceLabel).toBe("selling price");
  expect(results[1]?.detectedPrice).toBe(22.1);
  expect(results[1]?.detectedPriceCurrency).toBe("USD");
});

test("searchProductOffers filters unrelated priced results for ASIN-only queries", async () => {
  const fetchMock = mock(async () =>
    Response.json({
      results: [
        {
          title: "Unrelated deal",
          url: "https://deals.example/phones",
          content: "This price is $449 but it is for another product.",
        },
        {
          title: "Amazon listing B07SN9BHVV",
          url: "https://www.amazon.in/dp/B07SN9BHVV",
          content: "1 offer from ₹550.00 · Buying options.",
        },
      ],
    }),
  );

  const results = await searchProductOffers("B07SN9BHVV", {
    provider: "searxng",
    baseUrl: "https://searxng.test/",
    fetchImpl: fetchMock as unknown as typeof fetch,
  });

  expect(results).toHaveLength(1);
  expect(results[0]?.matchedAsin).toBe("B07SN9BHVV");
  expect(results[0]?.detectedPrice).toBe(550);
  expect(results[0]?.detectedPriceCurrency).toBe("INR");
  expect(results[0]?.detectedPriceText).toBe("₹550.00");
});

test("searchProductOffers keeps arbitrary query strings generic", async () => {
  const fetchMock = mock(async (input: string | URL | Request) => {
    const url = input instanceof URL ? input : new URL(String(input));
    expect(url.searchParams.get("q")).toBe("romand dry mango tulip price");

    return Response.json({
      results: [
        {
          title: "Generic result",
          url: "https://shop.example/romand",
          content: "Sale price: $14.25",
        },
      ],
    });
  });

  const results = await searchProductOffers("romand dry mango tulip price", {
    provider: "searxng",
    baseUrl: "https://searxng.test/",
    fetchImpl: fetchMock as unknown as typeof fetch,
  });

  expect(results).toHaveLength(1);
  expect(results[0]?.asin).toBeUndefined();
  expect(results[0]?.detectedPrice).toBe(14.25);
});

test("searchProductOffers sends configured categories", async () => {
  const fetchMock = mock(async (input: string | URL | Request) => {
    const url = input instanceof URL ? input : new URL(String(input));
    expect(url.searchParams.get("categories")).toBe("shopping");

    return Response.json({
      results: [
        {
          title: "Shopping result",
          url: "https://shop.example/item",
          content: "Offer price: $10.00",
        },
      ],
    });
  });

  const results = await searchProductOffers("romand price", {
    provider: "searxng",
    baseUrl: "https://searxng.test/",
    categories: "shopping",
    fetchImpl: fetchMock as unknown as typeof fetch,
  });

  expect(results[0]?.detectedPrice).toBe(10);
});

test("searchProductOffers sends configured SearXNG engines", async () => {
  const fetchMock = mock(async (input: string | URL | Request) => {
    const url = input instanceof URL ? input : new URL(String(input));
    expect(url.searchParams.get("engines")).toBe("google");
    expect(url.searchParams.get("q")).toBe("!go romand price");

    return Response.json({
      results: [
        {
          title: "Google-backed result",
          url: "https://shop.example/item",
          content: "Offer price: $11.00",
          engine: "google",
        },
      ],
    });
  });

  const results = await searchProductOffers("romand price", {
    provider: "searxng",
    baseUrl: "https://searxng.test/",
    engines: "google",
    fetchImpl: fetchMock as unknown as typeof fetch,
  });

  expect(results[0]?.detectedPrice).toBe(11);
  expect(results[0]?.engines).toEqual(["google"]);
});

test("searchProductOffers uses Google Custom Search API and pagemap offer prices", async () => {
  const fetchMock = mock(async (input: string | URL | Request) => {
    const url = input instanceof URL ? input : new URL(String(input));
    expect(url.hostname).toBe("googleapis.test");
    expect(url.searchParams.get("key")).toBe("test-key");
    expect(url.searchParams.get("cx")).toBe("test-cx");
    expect(url.searchParams.get("num")).toBe("5");
    expect(url.searchParams.get("q")).toBe("romand dry mango tulip");

    return Response.json({
      items: [
        {
          title: "Romand Dry Mango Tulip",
          link: "https://store.example/romand",
          snippet: "Buy from Store Example.",
          pagemap: {
            offer: [{ price: "12.50", pricecurrency: "USD" }],
          },
        },
      ],
    });
  });

  const results = await searchProductOffers("romand dry mango tulip", {
    provider: "google-custom-search",
    baseUrl: "https://googleapis.test/customsearch/v1",
    googleApiKey: "test-key",
    googleCx: "test-cx",
    maxResults: 5,
    fetchImpl: fetchMock as unknown as typeof fetch,
  });

  expect(results).toHaveLength(1);
  expect(results[0]?.title).toContain("Romand Dry Mango Tulip");
  expect(results[0]?.domain).toBe("store.example");
  expect(results[0]?.detectedPrice).toBe(12.5);
  expect(results[0]?.detectedPriceLabel).toBe("offer price");
  expect(results[0]?.engines).toEqual(["google custom search"]);
});

test("searchProductOffers defaults to SerpApi Google Shopping results", async () => {
  const fetchMock = mock(async (input: string | URL | Request) => {
    const url = input instanceof URL ? input : new URL(String(input));
    expect(url.hostname).toBe("serpapi.test");
    expect(url.searchParams.get("engine")).toBe("google_shopping");
    expect(url.searchParams.get("q")).toBe("dry mango tulip price");
    expect(url.searchParams.get("api_key")).toBe("serpapi-key");
    expect(url.searchParams.get("gl")).toBe("us");
    expect(url.searchParams.get("hl")).toBe("en");

    return Response.json({
      shopping_results: [
        {
          position: 1,
          title: "Romand Better Than Eyes Dry Mango Tulip",
          source: "K-Beauty Store",
          link: "https://store.example/products/romand",
          price: "$13.40",
          extracted_price: 13.4,
          delivery: "$4.99 delivery",
          rating: 4.7,
          reviews: 128,
        },
      ],
    });
  });

  const results = await searchProductOffers("dry mango tulip price", {
    baseUrl: "https://serpapi.test/search.json",
    serpapiApiKey: "serpapi-key",
    fetchImpl: fetchMock as unknown as typeof fetch,
  });

  expect(results).toHaveLength(1);
  expect(results[0]?.domain).toBe("store.example");
  expect(results[0]?.detectedPrice).toBe(13.4);
  expect(results[0]?.detectedPriceText).toBe("$13.40");
  expect(results[0]?.engines).toEqual(["serpapi google shopping"]);
});

test("searchProductOffers applies result limits and handles empty results", async () => {
  const fetchMock = mock(async () =>
    Response.json({
      results: [
        { title: "One", url: "https://one.example", content: "No price" },
        { title: "Two", url: "https://two.example", content: "$20.00" },
      ],
    }),
  );

  const limited = await searchProductOffers("romand palette", {
    provider: "searxng",
    baseUrl: "https://searxng.test/",
    fetchImpl: fetchMock as unknown as typeof fetch,
    maxResults: 1,
  });
  expect(limited).toHaveLength(1);
  expect(limited[0]?.domain).toBe("two.example");

  const emptyFetch = mock(async () => Response.json({ results: [] }));
  const empty = await searchProductOffers("missing product", {
    provider: "searxng",
    baseUrl: "https://searxng.test/",
    fetchImpl: emptyFetch as unknown as typeof fetch,
  });
  expect(empty).toEqual([]);
});