"""gitea:Adriano/TieMeasureFlow#72 - frame grab from the station camera.

The backend (station.camera_url / camera_source, GET /api/stations/by-code/{code})
is built elsewhere: api_client and requests are mocked here.
"""
from unittest.mock import MagicMock, patch

import requests

from tests.conftest import api_get_router

STATION = {
    "id": 1, "code": "ST-TEST", "name": "Linea",
    "camera_url": "http://host.docker.internal:8765",
    "camera_source": "camera:folder",
}
PNG = b"\x89PNG\r\n\x1a\n fake"


def _fake(status=200, content=PNG, ctype="image/png", json_body=None):
    resp = MagicMock(status_code=status, content=content, text=content.decode("latin-1"))
    resp.headers = {"content-type": ctype}
    if json_body is None:
        resp.json.side_effect = ValueError("no json")
    else:
        resp.json.return_value = json_body
    return resp


def _station(mock_api_client, monkeypatch, station):
    monkeypatch.setattr("blueprints.measure.Config.STATION_CODE", "ST-TEST")
    mock_api_client.get_station_by_code.return_value = station


def test_grab_without_camera_is_409(logged_in_client, mock_api_client, monkeypatch):
    _station(mock_api_client, monkeypatch, {**STATION, "camera_url": None})
    with patch("blueprints.measure.http_requests.post") as post:
        resp = logged_in_client.post("/measure/api/vision/grab")
    assert resp.status_code == 409
    assert resp.get_json()["error"]
    post.assert_not_called()


def test_grab_without_source_is_409(logged_in_client, mock_api_client, monkeypatch):
    _station(mock_api_client, monkeypatch, {**STATION, "camera_source": None})
    with patch("blueprints.measure.http_requests.post") as post:
        resp = logged_in_client.post("/measure/api/vision/grab")
    assert resp.status_code == 409
    post.assert_not_called()


def test_grab_station_lookup_error_is_409(logged_in_client, mock_api_client, monkeypatch):
    _station(mock_api_client, monkeypatch, {"error": True, "status_code": 404, "detail": "x"})
    resp = logged_in_client.post("/measure/api/vision/grab")
    assert resp.status_code == 409


def test_grab_passes_png_through(logged_in_client, mock_api_client, monkeypatch):
    _station(mock_api_client, monkeypatch, STATION)
    with patch("blueprints.measure.http_requests.post", return_value=_fake()) as post:
        resp = logged_in_client.post("/measure/api/vision/grab")
    assert resp.status_code == 200
    assert resp.mimetype == "image/png"
    assert resp.data == PNG
    mock_api_client.get_station_by_code.assert_called_once_with("ST-TEST")
    args, kwargs = post.call_args
    assert args[0] == "http://host.docker.internal:8765/camera/grab"
    assert kwargs["json"] == {
        "source": "camera:folder", "trigger": "continuo", "timeout_ms": 5000,
    }
    assert kwargs["timeout"] == 15


def test_grab_service_503_is_502(logged_in_client, mock_api_client, monkeypatch):
    _station(mock_api_client, monkeypatch, STATION)
    fake = _fake(503, b"{}", "application/json", {"detail": "camera occupata"})
    with patch("blueprints.measure.http_requests.post", return_value=fake):
        resp = logged_in_client.post("/measure/api/vision/grab")
    assert resp.status_code == 502
    body = resp.get_json()
    assert body["error"] is True
    assert "camera occupata" in body["detail"]


def test_grab_service_504_and_404_are_502(logged_in_client, mock_api_client, monkeypatch):
    _station(mock_api_client, monkeypatch, STATION)
    for status in (404, 504):
        with patch("blueprints.measure.http_requests.post",
                   return_value=_fake(status, b"nope", "text/plain")):
            resp = logged_in_client.post("/measure/api/vision/grab")
        assert resp.status_code == 502
        assert resp.get_json()["error"] is True


def test_grab_connection_error_is_502(logged_in_client, mock_api_client, monkeypatch):
    _station(mock_api_client, monkeypatch, STATION)
    with patch("blueprints.measure.http_requests.post",
               side_effect=requests.ConnectionError("refused")):
        resp = logged_in_client.post("/measure/api/vision/grab")
    assert resp.status_code == 502
    assert resp.get_json()["error"] is True


def test_grab_requires_measurement_tec(flask_app, mock_api_client, monkeypatch):
    _station(mock_api_client, monkeypatch, STATION)
    with flask_app.test_client() as c:
        with c.session_transaction() as sess:
            sess["api_key"] = "k"
            sess["user"] = {"id": 2, "username": "m", "roles": ["Maker"],
                            "is_admin": False, "active": True}
            sess["user_id"] = 2
        with patch("blueprints.measure.http_requests.post") as post:
            resp = c.post("/measure/api/vision/grab")
    assert resp.status_code == 403
    post.assert_not_called()


def test_grab_requires_login(client):
    resp = client.post("/measure/api/vision/grab")
    assert resp.status_code in (302, 401)


# --- execute page: button only when the station has a camera -----------------
TASK = {
    "id": 12, "recipe_id": 3, "version_id": 5, "task_type": "camera_measure",
    "title": "Foto", "directive": None, "description": None, "file_path": None,
    "file_type": None, "annotations_json": None, "subtasks": [],
}
RECIPE = {
    "id": 3, "code": "REC-1", "name": "Ricetta",
    "measurement_interval_minutes": 30, "allow_manual_input": True,
    "current_version": {"id": 5, "version_number": 1},
}


def _page(logged_in_client, mock_api_client, monkeypatch, station):
    _station(mock_api_client, monkeypatch, station)
    mock_api_client.get_station_recipes.return_value = {"items": [{"id": 3}]}
    mock_api_client.get.side_effect = api_get_router({
        "/api/tasks/12": TASK,
        "/api/recipes/3/tasks": [{"id": 12, "order_index": 0}],
        "/api/recipes/3": RECIPE,
    })
    return logged_in_client.get("/measure/execute/12").get_data(as_text=True)


def test_execute_page_shows_grab_button_with_camera(logged_in_client, mock_api_client, monkeypatch):
    html = _page(logged_in_client, mock_api_client, monkeypatch, STATION)
    assert "/measure/api/vision/grab" in html
    assert "grab()" in html


def test_execute_page_hides_grab_button_without_camera(logged_in_client, mock_api_client, monkeypatch):
    html = _page(logged_in_client, mock_api_client, monkeypatch, {**STATION, "camera_url": None})
    assert "grab()" not in html


def test_execute_page_hides_grab_button_when_lookup_fails(logged_in_client, mock_api_client, monkeypatch):
    html = _page(logged_in_client, mock_api_client, monkeypatch,
                 {"error": True, "status_code": 502, "detail": "down"})
    assert "grab()" not in html