"""Route-level tests over the FastAPI app with the weather/geocode layer faked —
they exercise the real routing, validation, derived-store and ETag plumbing, and
would catch wiring regressions (e.g. a handler calling a deleted helper)."""
import pytest
from fastapi.testclient import TestClient

from web import app as appmod
from data import climate
from data import places


@pytest.fixture
def client(monkeypatch, history, recent):
    monkeypatch.setattr(climate, "get_history",
                        lambda cell: (history.clone(), {"cached": True, "cache_age_days": 3}))
    monkeypatch.setattr(climate, "get_recent_forecast", lambda cell: recent.clone())
    monkeypatch.setattr(climate, "load_cached_history", lambda cell: history.clone())
    monkeypatch.setattr(climate, "recent_stamp", lambda cell_id: "rs-test")
    monkeypatch.setattr(climate, "reverse_geocode", lambda lat, lon: "Testville, Washington")
    return TestClient(appmod.app)


Q = {"lat": 47.6062, "lon": -122.3321}


def test_place_serves_any_point_worldwide(client):
    for q in (Q, {"lat": 48.8566, "lon": 2.3522}, {"lat": -33.8688, "lon": 151.2093}):
        r = client.get("/thermograph/api/v2/place", params=q)
        assert r.status_code == 200
        assert r.json()["place"] == "Testville, Washington"
        assert set(r.json()["cell"]) == {"center_lat", "center_lon"}


def test_grade_shape_and_conditional_revalidation(client, history):
    r = client.get("/thermograph/api/v2/grade", params=Q)
    assert r.status_code == 200
    body = r.json()
    assert body["place"] == "Testville, Washington"
    assert body["climatology"]["tmax"] is not None
    days = [d["date"] for d in body["recent"]]
    assert days == sorted(days, reverse=True)   # newest first
    assert body["recent"][0]["tmax"]["grade"]

    etag = r.headers["etag"]
    r304 = client.get("/thermograph/api/v2/grade", params=Q,
                      headers={"If-None-Match": etag})
    assert r304.status_code == 304 and r304.headers["etag"] == etag

    # Without the validator the derived store replays the exact same bytes.
    r2 = client.get("/thermograph/api/v2/grade", params=Q)
    assert r2.status_code == 200 and r2.content == r.content


def test_grade_is_aliased_across_api_versions(client):
    for prefix in ("api", "api/v1", "api/v2"):
        assert client.get(f"/thermograph/{prefix}/grade", params=Q).status_code == 200


def test_query_validation_rejects_out_of_range(client):
    assert client.get("/thermograph/api/v2/grade",
                      params={"lat": 999, "lon": 0}).status_code == 422
    assert client.get("/thermograph/api/v2/grade",
                      params={**Q, "days": 0}).status_code == 422


def test_api_version_reports_backend_contract(client):
    r = client.get("/thermograph/api/version")
    assert r.status_code == 200
    body = r.json()
    assert {"backend_version", "min_frontend", "payload_ver"} <= body.keys()
    assert body["backend_version"] == "2"


def test_day_detail_and_ladders(client, history):
    r = client.get("/thermograph/api/v2/day", params=Q)
    assert r.status_code == 200
    body = r.json()
    assert body["latest"] == history["date"].max().isoformat()
    tmax = body["detail"]["metrics"]["tmax"]
    assert tmax["ladder"]["tiers"][0]["c"] == "rec-hot"
    assert tmax["obs"]["grade"]


@pytest.mark.parametrize("path", ["grade", "calendar", "day", "forecast", "cell"])
def test_every_data_route_maps_rate_limit_to_503(client, monkeypatch, path):
    def rate_limited(cell):
        raise climate.WeatherUnavailable(climate.limit_message(False))
    monkeypatch.setattr(climate, "get_history", rate_limited)
    # A distinct spot per route: a store row cached by an earlier test would
    # otherwise be checked only after the (failing) history fetch anyway.
    r = client.get(f"/thermograph/api/v2/{path}", params={"lat": 51.5, "lon": -0.1})
    assert r.status_code == 503
    assert "rate-limited" in r.json()["detail"]


def test_upstream_failure_classification(client, monkeypatch):
    q = {"lat": 52.52, "lon": 13.4}

    def daily_quota(cell):
        raise climate.WeatherUnavailable(climate.limit_message(True), daily=True)
    monkeypatch.setattr(climate, "get_history", daily_quota)
    r = client.get("/thermograph/api/v2/grade", params=q)
    assert r.status_code == 503 and "tomorrow" in r.json()["detail"]

    # A raw upstream 429 that no fetcher classified still maps to a clean 503.
    def raw_429(cell):
        e = RuntimeError("upstream said no")
        e.response = type("R", (), {"status_code": 429})()
        raise e
    monkeypatch.setattr(climate, "get_history", raw_429)
    r = client.get("/thermograph/api/v2/grade", params=q)
    assert r.status_code == 503 and "rate-limited" in r.json()["detail"]

    # Anything else is a genuine upstream fault: 502 with the raw error.
    def boom(cell):
        raise RuntimeError("parquet cache corrupted")
    monkeypatch.setattr(climate, "get_history", boom)
    r = client.get("/thermograph/api/v2/grade", params=q)
    assert r.status_code == 502 and "parquet cache corrupted" in r.json()["detail"]


def test_cell_prefetch_never_fetches_upstream(client, monkeypatch):
    def boom(cell):
        raise AssertionError("prefetch=1 must never fetch weather upstream")
    monkeypatch.setattr(climate, "get_history", boom)
    monkeypatch.setattr(climate, "get_recent_forecast", boom)
    monkeypatch.setattr(climate, "load_cached_history", lambda cell: None)
    r = client.get("/thermograph/api/v2/cell", params={**Q, "prefetch": 1})
    assert r.status_code == 204   # cold cell: no body, no quota spent


def test_cell_prefetch_builds_history_slices_only(client):
    r = client.get("/thermograph/api/v2/cell", params={"lat": 10.0, "lon": 10.0, "prefetch": 1})
    assert r.status_code == 200
    assert set(r.json()["slices"]) == {"calendar", "day"}


def test_calendar_placeless_payload_is_not_persisted(client, monkeypatch):
    q = {"lat": -10.0, "lon": 20.0, "months": 2}
    monkeypatch.setattr(climate, "reverse_geocode", lambda lat, lon: None)
    r = client.get("/thermograph/api/v2/calendar", params=q)
    assert r.status_code == 200 and r.json()["place"] is None
    # The placeless payload wasn't cached, so the next request retries the
    # label instead of replaying bare coordinates for the life of the token.
    monkeypatch.setattr(climate, "reverse_geocode", lambda lat, lon: "Resolved, Now")
    assert client.get("/thermograph/api/v2/calendar", params=q).json()["place"] == "Resolved, Now"


def test_calendar_compact_range(client, history):
    r = client.get("/thermograph/api/v2/calendar", params={**Q, "months": 2})
    assert r.status_code == 200
    body = r.json()
    assert body["range"]["end"] == history["date"].max().isoformat()
    day = body["days"][0]
    assert {"date", "dsr", "tmax", "tmin", "precip"} <= set(day)
    assert set(day["tmax"]) == {"v", "pct", "c", "g"}


def test_forecast_grades_future_days(client):
    r = client.get("/thermograph/api/v2/forecast", params=Q)
    assert r.status_code == 200
    body = r.json()
    assert body["forecast"] is True
    days = [d["date"] for d in body["recent"]]
    assert days and days == sorted(days, reverse=True)   # furthest-out first
    assert min(days) > body["target_date"]               # strictly future


def test_cell_bundle_matches_per_view_payloads(client):
    r = client.get("/thermograph/api/v2/cell", params=Q)
    assert r.status_code == 200
    slices = r.json()["slices"]
    assert set(slices) == {"calendar", "grade", "forecast", "day"}
    for s in slices.values():
        assert s["etag"] and s["data"]
    # The grade slice must be byte-for-byte what /grade serves (same store row).
    grade = client.get("/thermograph/api/v2/grade", params=Q)
    assert grade.json() == slices["grade"]["data"]
    assert grade.headers["etag"] == slices["grade"]["etag"]

    r304 = client.get("/thermograph/api/v2/cell", params=Q,
                      headers={"If-None-Match": r.headers["etag"]})
    assert r304.status_code == 304


_LOCAL_HIT = [{"name": "Seattle", "admin1": "Washington", "country": "United States",
               "country_code": "US", "lat": 47.6, "lon": -122.33, "population": 737015,
               "match": "prefix"}]


def test_geocode_local_first_skips_network(client, monkeypatch):
    """A local GeoNames hit answers /geocode with no outbound Nominatim call, and
    the internal prefix/fuzzy tag is stripped from the wire shape."""
    monkeypatch.setattr(places, "search", lambda q, limit=5: list(_LOCAL_HIT))

    def _boom(*a, **k):
        raise AssertionError("Nominatim must not be called when the local index hits")
    monkeypatch.setattr(climate, "geocode_nominatim", _boom)

    r = client.get("/thermograph/api/v2/geocode", params={"q": "seattle"})
    assert r.status_code == 200
    res = r.json()["results"]
    assert res[0]["name"] == "Seattle"
    assert "match" not in res[0]


def test_geocode_falls_back_to_nominatim_on_local_miss(client, monkeypatch):
    """A local miss (or a still-loading index) falls back to Nominatim /search —
    the path that covers neighbourhoods/postcodes the cities dump lacks."""
    monkeypatch.setattr(places, "search", lambda q, limit=5: [])   # genuine miss
    nom = [{"name": "West Seattle", "admin1": "Washington", "country": "United States",
            "country_code": "US", "lat": 47.57, "lon": -122.38, "population": None}]
    called = []
    monkeypatch.setattr(climate, "geocode_nominatim",
                        lambda q, count=5: (called.append(q), nom)[1])

    r = client.get("/thermograph/api/v2/geocode", params={"q": "west seattle"})
    assert r.status_code == 200
    assert r.json()["results"][0]["name"] == "West Seattle"
    assert called == ["west seattle"]


def test_suggest_is_local_only_no_network(client, monkeypatch):
    """Autocomplete is served purely from the local index — even a reachable
    Nominatim must never be hit per keystroke."""
    monkeypatch.setattr(places, "search", lambda q, limit=5: list(_LOCAL_HIT))

    def _boom(*a, **k):
        raise AssertionError("/suggest must not make an outbound geocoder call")
    monkeypatch.setattr(climate, "geocode_nominatim", _boom)

    r = client.get("/thermograph/api/v2/suggest", params={"q": "seattle"})
    assert r.status_code == 200
    body = r.json()
    assert body["results"][0]["name"] == "Seattle"
    assert body["corrected"] is None


def test_cell_neighbors_flag_enqueues_warming(client, monkeypatch):
    from web import app as appmod
    monkeypatch.setattr(appmod, "_WARM_SEEN", {})
    # No lifespan in TestClient without a context manager, so no worker drains
    # the queue — enqueued cells just accumulate for inspection.
    monkeypatch.setattr(appmod, "_warm_queue", __import__("queue").Queue())
    r = client.get("/thermograph/api/v2/cell", params={"lat": 35.0, "lon": 25.0, "neighbors": 1})
    assert r.status_code == 200
    assert appmod._warm_queue.qsize() == 8
    assert len(appmod._WARM_SEEN) == 8
    # Same spot again within the TTL: nothing new enqueued.
    client.get("/thermograph/api/v2/cell", params={"lat": 35.0, "lon": 25.0, "neighbors": 1},
               headers={"If-None-Match": r.headers["etag"]})
    assert appmod._warm_queue.qsize() == 8


def test_warm_cell_materializes_history_slices(client, tmp_store, monkeypatch, history):
    from web import app as appmod
    from data import grid
    from api import payloads
    cell = grid.snap(-33.87, 151.21)
    appmod._warm_cell(cell)
    token = payloads.history_token(history)
    start_ts, end_ts = payloads.cal_span(history, None, None, 24)
    assert tmp_store.get_payload("calendar", cell["id"],
                                 payloads.calendar_key(start_ts, end_ts, 24), token) is not None
    last = history["date"].max()
    assert tmp_store.get_payload("day", cell["id"], payloads.day_key(last), token) is not None


def test_warm_cell_never_fetches_upstream(client, monkeypatch):
    from web import app as appmod
    def boom(cell):
        raise AssertionError("warming must never fetch weather upstream")
    monkeypatch.setattr(climate, "get_history", boom)
    monkeypatch.setattr(climate, "get_recent_forecast", boom)
    monkeypatch.setattr(climate, "load_cached_history", lambda cell: None)
    appmod._warm_cell({"id": "1_1", "center_lat": 0.03, "center_lon": 0.03})  # cold: no-op


def _score_history(years=45, seed=5):
    import datetime
    import numpy as np
    import polars as pl
    end = datetime.date(2026, 7, 11)
    start = datetime.date(end.year - years, end.month, end.day)
    dates = [start + datetime.timedelta(days=i) for i in range((end - start).days + 1)]
    n = len(dates)
    rng = np.random.default_rng(seed)
    doy = np.array([d.timetuple().tm_yday for d in dates])
    tmax = 55 + 30 * np.sin((doy - 100) / 366.0 * 2 * np.pi) + rng.normal(0, 8, n)
    return pl.DataFrame({
        "date": dates, "tmax": np.round(tmax, 1), "tmin": np.round(tmax - 15, 1),
        "feels": np.round(tmax + 1, 1), "humid": np.round(np.clip(12 + rng.normal(0, 3, n), 1, None), 1),
        "wetbulb": np.round(tmax - 12, 1), "wind": np.round(np.clip(8 + rng.normal(0, 3, n), 0, None), 1),
        "gust": np.round(np.clip(16 + rng.normal(0, 5, n), 0, None), 1),
        "precip": np.where(rng.random(n) < 0.3, 0.2, 0.0),
    }).with_columns(pl.col("date").dt.ordinal_day().cast(pl.Int16).alias("doy"))


@pytest.fixture
def score_client(monkeypatch):
    hist = _score_history()
    monkeypatch.setattr(climate, "get_history",
                        lambda cell: (hist.clone(), {"cached": True, "cache_age_days": 3}))
    monkeypatch.setattr(climate, "reverse_geocode", lambda lat, lon: "Testville, Washington")
    return TestClient(appmod.app)


def test_score_shape_and_conditional_revalidation(score_client):
    r = score_client.get("/thermograph/api/v2/score", params=Q)
    assert r.status_code == 200
    body = r.json()
    assert body["place"] == "Testville, Washington"
    s = body["scores"]
    assert set(s["slices"]) == {"annual", "djf", "mam", "jja", "son"}
    assert s["slices"]["annual"]["overall"]["score"] is not None

    etag = r.headers["etag"]
    r304 = score_client.get("/thermograph/api/v2/score", params=Q,
                            headers={"If-None-Match": etag})
    assert r304.status_code == 304 and r304.headers["etag"] == etag

    # Second GET replays the exact same bytes from the derived store.
    r2 = score_client.get("/thermograph/api/v2/score", params=Q)
    assert r2.status_code == 200 and r2.content == r.content