"""코어 파이프라인 테스트 — 필터·IQR 이상치·top-N 최저가 (결정론적, 네트워크 불필요)."""

from pathlib import Path

from services.search.contract import NormalizedProduct
from services.search.coupang.parser import parse_search_html
from services.pipeline.filters import filter_by_price_band, filter_out_malls
from services.pipeline.outliers import remove_price_outliers
from services.pipeline.core import run_price_pipeline

FIXTURE = Path(__file__).parent / "fixtures" / "coupang_search.html"


def _p(price, name="p", mall="쿠팡"):
    return NormalizedProduct(source="coupang", name=name, price=price, mall_name=mall)


def test_top_n_is_lowest_price_sorted():
    prods = [_p(x) for x in [3000, 1000, 2000, 5000, 4000]]
    r = run_price_pipeline(prods, remove_outliers=False, top_n=3)
    assert [p["price"] for p in r["top"]] == [1000, 2000, 3000]
    assert r["lowest"]["price"] == 1000


def test_outlier_removes_extreme_low_and_high():
    normal = [_p(x) for x in [1000, 1010, 1020, 1030, 1040, 1050, 1060, 1070, 1080, 1090]]
    kept, removed = remove_price_outliers(normal + [_p(5), _p(500000)])
    prices_removed = {p.price for p in removed}
    assert 5 in prices_removed and 500000 in prices_removed
    assert all(1000 <= p.price <= 1090 for p in kept)


def test_price_band_filter():
    prods = [_p(x) for x in [8000, 10000, 12000, 30000, 1000]]
    # 기준가 10000, ±70% → [3000, 17000] 만 통과
    out = filter_by_price_band(prods, base_price=10000, tolerance=0.7)
    assert {p.price for p in out} == {8000, 10000, 12000}


def test_filter_out_malls():
    prods = [_p(1000, mall="쿠팡"), _p(2000, mall="G마켓"), _p(3000, mall="옥션")]
    out = filter_out_malls(prods, ["G마켓", "옥션"])
    assert {p.mall_name for p in out} == {"쿠팡"}


def test_empty_input_is_safe():
    r = run_price_pipeline([], top_n=5)
    assert r["lowest"] is None and r["top"] == [] and r["total_found"] == 0


def test_stages_recorded():
    prods = [_p(x) for x in [1000, 2000, 3000, 4000, 5000]]
    r = run_price_pipeline(prods, base_price=3000, top_n=2)
    names = [s["stage"] for s in r["stages"]]
    assert "price_band" in names and "outlier" in names and names[-1] == "top_n"
    assert r["stages"][-1]["out"] == 2  # top_n 결과 수


def test_pipeline_on_real_fixture():
    products = parse_search_html(FIXTURE.read_text())
    r = run_price_pipeline(products, remove_outliers=False, top_n=3)
    prices = [p["price"] for p in r["top"]]
    assert prices == sorted(prices)                      # 최저가순
    assert r["lowest"]["price"] == min(p.price for p in products)