"""The HTTP surface, exercised with no network and no credentials."""

from __future__ import annotations

import pytest
from fastapi.testclient import TestClient

from server import catalog
from server.main import app


@pytest.fixture(autouse=True)
def no_credentials(monkeypatch):
    for var in ("HF_TOKEN", "HUGGING_FACE_HUB_TOKEN", "SPACE_ID",
                "ASE_ALLOW_SPACE_CREDITS"):
        monkeypatch.delenv(var, raising=False)
    # The suite must never pick up the developer's real key.txt.
    monkeypatch.setenv("ASE_KEY_FILE", "/nonexistent/ase-glm-test-key")


@pytest.fixture
def client():
    return TestClient(app)


def test_health(client):
    assert client.get("/api/health").json()["ok"] is True


def test_config_lists_the_models_and_the_billing_mode(client):
    body = client.get("/api/config").json()
    ids = [m["id"] for m in body["models"]]
    assert "zai-org/GLM-5.3" in ids
    assert body["defaultModel"] == catalog.DEFAULT_MODEL
    assert body["auth"]["billsViewer"] is False
    assert "token" not in body["auth"]


def test_every_catalog_model_is_well_formed():
    for m in catalog.MODELS:
        j = m.to_json()
        assert "/" in j["id"], "an id must be owner/name to route"
        assert j["label"] and j["vendor"]
        assert j["providers"], f"{j['id']} has no route"
        assert j["contextTokens"] is None or j["contextTokens"] > 0


def sse_events(response) -> list[tuple[str, str]]:
    out, name, data = [], "message", []
    for line in response.text.split("\n"):
        if line.startswith("event:"):
            name = line[6:].strip()
        elif line.startswith("data:"):
            data.append(line[5:].lstrip(" "))
        elif not line.strip() and data:
            out.append((name, "\n".join(data)))
            name, data = "message", []
    if data:
        out.append((name, "\n".join(data)))
    return out


def test_a_missing_credential_is_reported_in_the_stream_not_as_a_4xx(client):
    # The client renders errors into the transcript. A 4xx would show as a
    # transport failure somewhere the reader is not looking.
    r = client.post("/api/chat", json={
        "model": "zai-org/GLM-5.3",
        "messages": [{"role": "user", "content": "hi"}],
    })
    assert r.status_code == 200
    events = sse_events(r)
    assert events[0][0] == "error"
    assert "credential" in events[0][1].lower()


def test_an_unknown_model_is_refused_before_any_upstream_call(client):
    r = client.post("/api/chat", json={
        "model": "../../etc/passwd",
        "messages": [{"role": "user", "content": "hi"}],
    })
    assert sse_events(r)[0][0] == "error"
    assert "Unknown model" in sse_events(r)[0][1]


@pytest.mark.parametrize("body", [
    {"model": "zai-org/GLM-5.3"},
    {"model": "zai-org/GLM-5.3", "messages": []},
    {"model": "zai-org/GLM-5.3", "messages": "not a list"},
])
def test_a_request_with_no_messages_is_refused(client, body):
    assert sse_events(client.post("/api/chat", json=body))[0][0] == "error"


def test_model_insight_rejects_a_model_not_in_the_catalog(client):
    r = client.get("/api/model", params={"id": "evil/model"})
    assert r.status_code == 400


def test_an_unknown_api_path_is_a_404_not_the_index_page(client):
    # The SPA catch-all matches anything the declared routes did not. If it
    # answers an /api path, a typo'd endpoint returns 200 full of HTML and the
    # client reports a JSON parse error a long way from the cause.
    r = client.get("/api/does-not-exist")
    assert r.status_code == 404
    assert "<html" not in r.text.lower()


def test_a_non_api_path_still_falls_through_to_the_app(client):
    # Only reachable once the bundle has been built; skip rather than fail in a
    # bare checkout, since CI builds it before the deploy either way.
    r = client.get("/some/client/route")
    assert r.status_code in (200, 404)


def test_the_page_is_not_cached(client):
    """A cached index.html keeps pointing at the previous bundle.

    The assets are content-hashed and may cache forever; the page that names
    them may not, or a deploy is invisible until the browser feels like
    re-fetching — which reads as "the deploy did nothing".
    """
    for path in ("/", "/anything"):
        r = client.get(path)
        if r.status_code != 200:
            continue
        assert "no-cache" in r.headers.get("cache-control", "")