"""FastAPI endpoint tests.

Use Starlette's TestClient so we never hit a real port. The tests verify the
response contract the React UI relies on.
"""

from __future__ import annotations

import pytest
from fastapi.testclient import TestClient

from app.api.server import app


@pytest.fixture(scope="module")
def client() -> TestClient:
    with TestClient(app) as c:
        yield c


def test_healthz(client):
    r = client.get("/api/healthz")
    assert r.status_code == 200
    body = r.json()
    assert body["status"] == "ok"
    assert "version" in body


def test_status_reports_ok_with_reference_loaded(client):
    r = client.get("/api/status")
    assert r.status_code == 200
    body = r.json()
    assert body["status"] == "ok", f"degraded: {body.get('startup_errors')}"
    assert body["pipeline_ready"] is True
    assert body["reference_counts"]["hcc_labels"] > 0
    assert body["reference_counts"]["hcc_crosswalk_icd10"] > 0
    assert body["gallery_size"] > 0
    assert body["metrics_available"] is True


def test_code_endpoint_roundtrip(client):
    r = client.post(
        "/api/code",
        json={"text": "A/P: Type 2 diabetes mellitus with diabetic polyneuropathy. Continue metformin."},
    )
    assert r.status_code == 200, r.text
    body = r.json()
    assert body["note_id"] == "adhoc"
    assert isinstance(body["candidates"], list)
    hccs = {c["hcc"] for c in body["candidates"]}
    assert "HCC-18" in hccs


def test_gallery_returns_precomputed_cases(client):
    r = client.get("/api/gallery")
    assert r.status_code == 200
    body = r.json()
    assert isinstance(body, list) and len(body) > 0
    first = body[0]
    assert {"case_id", "name", "tags", "text", "result"}.issubset(first)


def test_metrics_snapshot_shape(client):
    r = client.get("/api/metrics")
    assert r.status_code == 200
    body = r.json()
    assert "overall" in body and "per_hcc" in body and "meat_category" in body
    assert "subgroups" in body and "note_length" in body["subgroups"]


def test_reference_hcc(client):
    r = client.get("/api/reference/hcc")
    assert r.status_code == 200
    rows = r.json()
    assert any(row["hcc_id"] == "HCC-85" for row in rows)


def test_code_endpoint_rejects_empty_body(client):
    r = client.post("/api/code", json={"text": ""})
    # Pydantic's min_length=1 returns 422
    assert r.status_code == 422