"""Integrationstests Control Core (PLAN.md §6.1B, §23, §36 Nr. 9).

FastAPI-REST + WebSocket mit derselben Parameter-Engine, die auch
Art-Net bedient (§11: eine autoritative Instanz).
"""

from __future__ import annotations

import uuid

import pytest
from fastapi.testclient import TestClient
from hms_control_server import create_app


@pytest.fixture()
def client() -> TestClient:
    return TestClient(create_app())


def _payload(path: str, value: float) -> dict:
    return {"parameter_path": path, "value": value}


@pytest.fixture()
def path() -> str:
    return f"composition/{uuid.uuid4()}/layer/{uuid.uuid4()}/opacity"


# ---------- Health/Capabilities ----------


def test_health(client: TestClient) -> None:
    r = client.get("/api/v1/system/health")
    assert r.status_code == 200
    assert r.json()["status"] == "ok"
    assert r.json()["phase"] == 0


def test_capabilities_reported_without_fake_tier(client: TestClient) -> None:
    r = client.get("/api/v1/system/capabilities")
    assert r.status_code == 200
    body = r.json()
    assert body["tier"] is None  # ungeprüft (CPU-only-Umgebung), kein Fake


def test_diagnostics_reports_not_connected(client: TestClient) -> None:
    r = client.get("/api/v1/diagnostics")
    assert r.status_code == 200
    assert r.json()["renderer"] == "not_connected"  # IPC-Handshake Phase 1


# ---------- Commands (§23.2) ----------


def test_parameter_set_command_ack(client: TestClient, path: str) -> None:
    r = client.post("/api/v1/commands", json={"payload": _payload(path, 0.75)})
    assert r.status_code == 200
    body = r.json()
    assert body["status"] == "ack"
    assert body["effective"] == pytest.approx(0.75)


def test_duplicate_command_id_is_idempotent(client: TestClient, path: str) -> None:
    cmd = {"command_id": str(uuid.uuid4()), "payload": _payload(path, 0.5)}
    first = client.post("/api/v1/commands", json=cmd).json()
    second = client.post("/api/v1/commands", json=cmd).json()
    assert first["status"] == "ack"
    assert second.get("duplicate") is True  # gleiches Ack, kein Doppel-Apply
    assert second["result"]["revision"] == first["revision"]


def test_revision_conflict_returns_409(client: TestClient, path: str) -> None:
    r = client.post(
        "/api/v1/commands",
        json={"payload": _payload(path, 0.5), "expected_revision": 999},
    )
    assert r.status_code == 409
    assert r.json()["detail"]["error"] == "REVISION_CONFLICT"


def test_invalid_parameter_path_returns_400(client: TestClient) -> None:
    r = client.post(
        "/api/v1/commands",
        json={"payload": _payload("../evil/path", 1.0)},
    )
    assert r.status_code == 400


def test_unknown_command_type_returns_400(client: TestClient) -> None:
    r = client.post("/api/v1/commands", json={"type": "renderer.draw", "payload": {}})
    assert r.status_code == 400


def test_parameters_endpoint_reflects_state(client: TestClient, path: str) -> None:
    client.post("/api/v1/commands", json={"payload": _payload(path, 0.42)})
    r = client.get("/api/v1/parameters")
    assert r.status_code == 200
    assert r.json()["values"][path] == pytest.approx(0.42)
    assert r.json()["revision"] >= 1


# ---------- WebSocket (§23.3) ----------


def test_websocket_snapshot_on_connect(client: TestClient, path: str) -> None:
    client.post("/api/v1/commands", json={"payload": _payload(path, 0.33)})
    with client.websocket_connect("/ws") as ws:
        snap = ws.receive_json()
        assert snap["type"] == "snapshot"
        assert snap["values"][path] == pytest.approx(0.33)


def test_websocket_receives_parameter_updates(client: TestClient, path: str) -> None:
    with client.websocket_connect("/ws") as ws:
        ws.receive_json()  # Initial-Snapshot
        client.post("/api/v1/commands", json={"payload": _payload(path, 0.9)})
        event = ws.receive_json()
        assert event["type"] == "parameter.update"
        assert event["parameter_path"] == path
        assert event["value"] == pytest.approx(0.9)