from fastapi.testclient import TestClient

from webapp.app import app


client = TestClient(app)


def test_health_endpoint():
    response = client.get("/api/health")
    assert response.status_code == 200
    payload = response.json()
    assert payload["ok"] is True
    assert payload["version"] == "0.4.7"


def test_simulation_endpoint_preserves_equal_budget():
    response = client.post(
        "/api/simulate",
        json={
            "rng_seed": 3,
            "n_paths": 5,
            "n_steps": 100,
            "drop_fraction": 0.05,
            "rise_fraction": 0.08,
            "max_detection_lag_steps": 3,
        },
    )
    assert response.status_code == 200
    payload = response.json()
    assert payload["adaptive_total_samples"] == payload["fixed_total_samples"]
    assert payload["max_detection_lag_steps"] == 3

def test_webapp_imports_from_source_checkout_without_installed_package(tmp_path):
    """The documented direct uvicorn command must resolve the src-layout package."""
    import os
    import subprocess
    import sys
    from pathlib import Path

    repo_root = Path(__file__).resolve().parents[1]
    env = os.environ.copy()
    env.pop("PYTHONPATH", None)
    completed = subprocess.run(
        [sys.executable, "-c", "import webapp.app; print(webapp.app.app.title)"],
        cwd=repo_root,
        env=env,
        capture_output=True,
        text=True,
        check=False,
    )
    assert completed.returncode == 0, completed.stderr
    assert "Adaptive Barrier Monitor" in completed.stdout



def test_simulation_endpoint_supports_fixed_cadence():
    response = client.post(
        "/api/simulate",
        json={
            "rng_seed": 3,
            "n_paths": 5,
            "n_steps": 200,
            "window_minutes": 200.0,
            "dt_cap_minutes": 2.0,
            "comparison_mode": "fixed_cadence",
            "fixed_cadence_minutes": 20.0,
        },
    )
    assert response.status_code == 200
    payload = response.json()
    assert payload["comparison_mode"] == "fixed_cadence"
    assert payload["fixed_cadence_minutes"] == 20.0
    assert payload["adaptive_total_samples"] != payload["fixed_total_samples"]


def test_simulation_endpoint_rejects_unknown_comparison_mode():
    response = client.post(
        "/api/simulate",
        json={"comparison_mode": "unknown"},
    )
    assert response.status_code == 422