import httpx

from opengoods.adapters.openfoodfacts import OpenFoodFactsAdapter, is_cn_gs1


def _adapter(handler, **kwargs):
    client = httpx.Client(transport=httpx.MockTransport(handler))
    return OpenFoodFactsAdapter(client=client, min_interval=0, backoff_base=0, **kwargs)


def test_is_cn_gs1():
    assert is_cn_gs1("6901234567892")  # GS1 China prefix
    assert is_cn_gs1("690")
    assert not is_cn_gs1("3017624010701")  # France
    assert not is_cn_gs1("5449000000996")  # Belgium
    assert not is_cn_gs1("")
    assert not is_cn_gs1(None)
    assert not is_cn_gs1("69")  # too short to carry a prefix digit


def test_fetch_by_country_passes_filter_and_paginates():
    seen_params = []

    def handler(request: httpx.Request) -> httpx.Response:
        seen_params.append(dict(request.url.params))
        page = int(request.url.params.get("page", "1"))
        if page == 1:
            return httpx.Response(
                200,
                json={"products": [{"code": "6901"}, {"code": "6902"}]},
            )
        return httpx.Response(200, json={"products": []})

    adapter = _adapter(handler)
    out = list(adapter.fetch_by_country("china", page_size=2, max_pages=5))
    assert [p["code"] for p in out] == ["6901", "6902"]
    assert seen_params[0]["countries_tags_en"] == "china"
    assert seen_params[0]["sort_by"] == "unique_scans_n"


def test_fetch_by_country_dedupes_across_pages():
    def handler(request: httpx.Request) -> httpx.Response:
        page = int(request.url.params.get("page", "1"))
        if page == 1:
            return httpx.Response(200, json={"products": [{"code": "6901"}, {"code": "6902"}]})
        if page == 2:
            # OFF popularity ordering is unstable; a repeat appears on page 2
            return httpx.Response(200, json={"products": [{"code": "6902"}, {"code": "6903"}]})
        return httpx.Response(200, json={"products": []})

    adapter = _adapter(handler)
    out = [p["code"] for p in adapter.fetch_by_country("china", page_size=2, max_pages=5)]
    assert out == ["6901", "6902", "6903"]