import os
from unittest.mock import patch

from fastapi import HTTPException, Request
from fastapi.testclient import TestClient

from frigate.api.auth import (
    get_allowed_cameras_for_filter,
    get_current_user,
)
from frigate.models import Event, Recordings, ReviewSegment
from frigate.test.http_api.base_http_test import AuthTestClient, BaseTestHttp

# Minimal multi-camera config used by go2rtc stream access tests.
# front_door has a stream alias "front_door_main"; back_door uses its own name.
# The "limited_user" role is restricted to front_door only.
_MULTI_CAMERA_CONFIG = {
    "mqtt": {"host": "mqtt"},
    "auth": {
        "roles": {
            "limited_user": ["front_door"],
        }
    },
    "cameras": {
        "front_door": {
            "ffmpeg": {
                "inputs": [{"path": "rtsp://10.0.0.1:554/video", "roles": ["detect"]}]
            },
            "detect": {"height": 1080, "width": 1920, "fps": 5},
            "live": {"streams": {"default": "front_door_main"}},
        },
        "back_door": {
            "ffmpeg": {
                "inputs": [{"path": "rtsp://10.0.0.2:554/video", "roles": ["detect"]}]
            },
            "detect": {"height": 1080, "width": 1920, "fps": 5},
        },
    },
}


class TestCameraAccessEventReview(BaseTestHttp):
    def setUp(self):
        super().setUp([Event, ReviewSegment, Recordings])
        self.app = super().create_app()

        # Mock get_current_user for all tests
        async def mock_get_current_user(request: Request):
            username = request.headers.get("remote-user")
            role = request.headers.get("remote-role")
            if not username or not role:
                from fastapi.responses import JSONResponse

                return JSONResponse(
                    content={"message": "No authorization headers."}, status_code=401
                )
            return {"username": username, "role": role}

        self.app.dependency_overrides[get_current_user] = mock_get_current_user

    def tearDown(self):
        self.app.dependency_overrides.clear()
        super().tearDown()

    def test_event_camera_access(self):
        super().insert_mock_event("event1", camera="front_door")
        super().insert_mock_event("event2", camera="back_door")

        async def mock_cameras(request: Request):
            return ["front_door"]

        self.app.dependency_overrides[get_allowed_cameras_for_filter] = mock_cameras
        with AuthTestClient(self.app) as client:
            resp = client.get("/events")
            assert resp.status_code == 200
            ids = [e["id"] for e in resp.json()]
            assert "event1" in ids
            assert "event2" not in ids

        async def mock_cameras(request: Request):
            return [
                "front_door",
                "back_door",
            ]

        self.app.dependency_overrides[get_allowed_cameras_for_filter] = mock_cameras
        with AuthTestClient(self.app) as client:
            resp = client.get("/events")
            assert resp.status_code == 200
            ids = [e["id"] for e in resp.json()]
            assert "event1" in ids and "event2" in ids

    def test_review_camera_access(self):
        super().insert_mock_review_segment("rev1", camera="front_door")
        super().insert_mock_review_segment("rev2", camera="back_door")

        async def mock_cameras(request: Request):
            return ["front_door"]

        self.app.dependency_overrides[get_allowed_cameras_for_filter] = mock_cameras
        with AuthTestClient(self.app) as client:
            resp = client.get("/review")
            assert resp.status_code == 200
            ids = [r["id"] for r in resp.json()]
            assert "rev1" in ids
            assert "rev2" not in ids

        async def mock_cameras(request: Request):
            return [
                "front_door",
                "back_door",
            ]

        self.app.dependency_overrides[get_allowed_cameras_for_filter] = mock_cameras
        with AuthTestClient(self.app) as client:
            resp = client.get("/review")
            assert resp.status_code == 200
            ids = [r["id"] for r in resp.json()]
            assert "rev1" in ids and "rev2" in ids

    def test_event_single_access(self):
        super().insert_mock_event("event1", camera="front_door")

        # Allowed
        async def mock_require_allowed(camera: str, request: Request = None):
            if camera == "front_door":
                return
            raise HTTPException(status_code=403, detail="Access denied")

        with patch("frigate.api.event.require_camera_access", mock_require_allowed):
            with AuthTestClient(self.app) as client:
                resp = client.get("/events/event1")
                assert resp.status_code == 200
                assert resp.json()["id"] == "event1"

        # Disallowed
        async def mock_require_disallowed(camera: str, request: Request = None):
            raise HTTPException(status_code=403, detail="Access denied")

        with patch("frigate.api.event.require_camera_access", mock_require_disallowed):
            with AuthTestClient(self.app) as client:
                resp = client.get("/events/event1")
                assert resp.status_code == 403

    def test_review_single_access(self):
        super().insert_mock_review_segment("rev1", camera="front_door")

        # Allowed
        async def mock_require_allowed(camera: str, request: Request = None):
            if camera == "front_door":
                return
            raise HTTPException(status_code=403, detail="Access denied")

        with patch("frigate.api.review.require_camera_access", mock_require_allowed):
            with AuthTestClient(self.app) as client:
                resp = client.get("/review/rev1")
                assert resp.status_code == 200
                assert resp.json()["id"] == "rev1"

        # Disallowed
        async def mock_require_disallowed(camera: str, request: Request = None):
            raise HTTPException(status_code=403, detail="Access denied")

        with patch("frigate.api.review.require_camera_access", mock_require_disallowed):
            with AuthTestClient(self.app) as client:
                resp = client.get("/review/rev1")
                assert resp.status_code == 403

    def test_event_search_access(self):
        super().insert_mock_event("event1", camera="front_door")
        super().insert_mock_event("event2", camera="back_door")

        async def mock_cameras(request: Request):
            return ["front_door"]

        self.app.dependency_overrides[get_allowed_cameras_for_filter] = mock_cameras
        with AuthTestClient(self.app) as client:
            resp = client.get("/events", params={"cameras": "all"})
            assert resp.status_code == 200
            ids = [e["id"] for e in resp.json()]
            assert "event1" in ids
            assert "event2" not in ids

        async def mock_cameras(request: Request):
            return [
                "front_door",
                "back_door",
            ]

        self.app.dependency_overrides[get_allowed_cameras_for_filter] = mock_cameras
        with AuthTestClient(self.app) as client:
            resp = client.get("/events", params={"cameras": "all"})
            assert resp.status_code == 200
            ids = [e["id"] for e in resp.json()]
            assert "event1" in ids and "event2" in ids

    def test_event_summary_access(self):
        super().insert_mock_event("event1", camera="front_door")
        super().insert_mock_event("event2", camera="back_door")

        async def mock_cameras(request: Request):
            return ["front_door"]

        self.app.dependency_overrides[get_allowed_cameras_for_filter] = mock_cameras
        with AuthTestClient(self.app) as client:
            resp = client.get("/events/summary")
            assert resp.status_code == 200
            summary_list = resp.json()
            assert len(summary_list) == 1

        async def mock_cameras(request: Request):
            return [
                "front_door",
                "back_door",
            ]

        self.app.dependency_overrides[get_allowed_cameras_for_filter] = mock_cameras
        with AuthTestClient(self.app) as client:
            resp = client.get("/events/summary")
            summary_list = resp.json()
            assert len(summary_list) == 2


class TestGo2rtcStreamAccess(BaseTestHttp):
    """Tests for require_go2rtc_stream_access — the auth dependency on
    GET /go2rtc/streams/{stream_name}.

    go2rtc is not running in unit tests, so an authorized request returns
    500 (the proxy call fails), while an unauthorized request returns 401/403
    before the proxy is ever reached.
    """

    def _make_app(self, config_override: dict | None = None):
        """Build a test app, optionally replacing self.minimal_config."""
        if config_override is not None:
            self.minimal_config = config_override
        app = super().create_app()

        # Allow tests to control the current user via request headers.
        async def mock_get_current_user(request: Request):
            username = request.headers.get("remote-user")
            role = request.headers.get("remote-role")
            if not username or not role:
                from fastapi.responses import JSONResponse

                return JSONResponse(
                    content={"message": "No authorization headers."},
                    status_code=401,
                )
            return {"username": username, "role": role}

        app.dependency_overrides[get_current_user] = mock_get_current_user
        return app

    def setUp(self):
        super().setUp([Event, ReviewSegment, Recordings])

    def tearDown(self):
        super().tearDown()

    # ------------------------------------------------------------------
    # Helpers
    # ------------------------------------------------------------------

    def _get_stream(
        self, app, stream_name: str, role: str = "admin", user: str = "test"
    ):
        """Issue GET /go2rtc/streams/{stream_name} with the given role."""
        with AuthTestClient(app) as client:
            return client.get(
                f"/go2rtc/streams/{stream_name}",
                headers={"remote-user": user, "remote-role": role},
            )

    # ------------------------------------------------------------------
    # Tests
    # ------------------------------------------------------------------

    def test_admin_can_access_any_stream(self):
        """Admin role bypasses camera restrictions."""
        app = self._make_app(_MULTI_CAMERA_CONFIG)
        # front_door stream — go2rtc is not running so expect 500, not 401/403
        resp = self._get_stream(app, "front_door", role="admin")
        assert resp.status_code not in (401, 403), (
            f"Admin should not be blocked; got {resp.status_code}"
        )

        # back_door stream
        resp = self._get_stream(app, "back_door", role="admin")
        assert resp.status_code not in (401, 403)

    def test_missing_auth_headers_returns_401(self):
        """Requests without auth headers must be rejected with 401."""
        app = self._make_app(_MULTI_CAMERA_CONFIG)
        # Use plain TestClient (not AuthTestClient) so no headers are injected.
        with TestClient(app, raise_server_exceptions=False) as client:
            resp = client.get("/go2rtc/streams/front_door")
        assert resp.status_code == 401, f"Expected 401, got {resp.status_code}"

    def test_unconfigured_role_can_access_any_stream(self):
        """When no camera restrictions are configured for a role the user
        should have access to all streams (no roles_dict entry ⇒ no restriction)."""
        no_roles_config = {
            "mqtt": {"host": "mqtt"},
            "cameras": {
                "front_door": {
                    "ffmpeg": {
                        "inputs": [
                            {"path": "rtsp://10.0.0.1:554/video", "roles": ["detect"]}
                        ]
                    },
                    "detect": {"height": 1080, "width": 1920, "fps": 5},
                },
                "back_door": {
                    "ffmpeg": {
                        "inputs": [
                            {"path": "rtsp://10.0.0.2:554/video", "roles": ["detect"]}
                        ]
                    },
                    "detect": {"height": 1080, "width": 1920, "fps": 5},
                },
            },
        }
        app = self._make_app(no_roles_config)

        # "myuser" role is not listed in roles_dict — should be allowed everywhere
        for stream in ("front_door", "back_door"):
            resp = self._get_stream(app, stream, role="myuser")
            assert resp.status_code not in (401, 403), (
                f"Unconfigured role should not be blocked on '{stream}'; "
                f"got {resp.status_code}"
            )

    def test_restricted_role_can_access_allowed_camera(self):
        """limited_user role (restricted to front_door) can access front_door stream."""
        app = self._make_app(_MULTI_CAMERA_CONFIG)
        resp = self._get_stream(app, "front_door", role="limited_user")
        assert resp.status_code not in (401, 403), (
            f"limited_user should be allowed on front_door; got {resp.status_code}"
        )

    def test_restricted_role_blocked_from_disallowed_camera(self):
        """limited_user role (restricted to front_door) cannot access back_door stream."""
        app = self._make_app(_MULTI_CAMERA_CONFIG)
        resp = self._get_stream(app, "back_door", role="limited_user")
        assert resp.status_code == 403, (
            f"limited_user should be denied on back_door; got {resp.status_code}"
        )

    def test_stream_alias_allowed_for_owning_camera(self):
        """Stream alias 'front_door_main' is owned by front_door; limited_user (who
        is allowed front_door) should be permitted."""
        app = self._make_app(_MULTI_CAMERA_CONFIG)
        # front_door_main is the alias defined in live.streams for front_door
        resp = self._get_stream(app, "front_door_main", role="limited_user")
        assert resp.status_code not in (401, 403), (
            f"limited_user should be allowed on alias front_door_main; "
            f"got {resp.status_code}"
        )

    def test_add_stream_rejects_restricted_source(self):
        """PUT /go2rtc/streams must reject exec:/echo:/expr: sources even for
        admins"""
        app = self._make_app(_MULTI_CAMERA_CONFIG)
        with AuthTestClient(app) as client:
            for src in (
                "exec:/tmp/rev.sh",
                "echo:foo",
                "expr:bar",
                "  exec:/tmp/rev.sh",
            ):
                resp = client.put(f"/go2rtc/streams/revshell?src={src}")
                assert resp.status_code == 400, (
                    f"Expected 400 for restricted src {src!r}; got {resp.status_code}"
                )
                assert resp.json().get("success") is False

    def test_add_stream_allows_non_restricted_source(self):
        """A normal stream URL should pass the restricted-source check and reach
        the (unavailable in tests) go2rtc proxy — so we expect 500, not 400."""
        app = self._make_app(_MULTI_CAMERA_CONFIG)
        with AuthTestClient(app) as client:
            resp = client.put("/go2rtc/streams/legit?src=rtsp://10.0.0.1:554/video")
            assert resp.status_code != 400, (
                f"Non-restricted source should not be rejected with 400; got {resp.status_code}"
            )

    def test_add_stream_allows_restricted_source_when_override_set(self):
        """When GO2RTC_ALLOW_ARBITRARY_EXEC is set, the API must defer to operator
        intent and forward the request to go2rtc instead of short-circuiting with 400."""
        app = self._make_app(_MULTI_CAMERA_CONFIG)
        mock_response = type("R", (), {"ok": True, "status_code": 200, "text": "ok"})()
        with patch.dict(os.environ, {"GO2RTC_ALLOW_ARBITRARY_EXEC": "true"}):
            with patch(
                "frigate.api.camera.requests.put", return_value=mock_response
            ) as mock_put:
                with AuthTestClient(app) as client:
                    resp = client.put("/go2rtc/streams/legit?src=exec:/tmp/something")
                assert resp.status_code == 200, (
                    f"Restricted src should be forwarded when override set; got {resp.status_code}"
                )
                mock_put.assert_called_once()
                forwarded_src = mock_put.call_args.kwargs["params"]["src"]
                assert forwarded_src == "exec:/tmp/something"

    def test_stream_alias_blocked_when_owning_camera_disallowed(self):
        """limited_user cannot access a stream alias that belongs to a camera they
        are not allowed to see."""
        # Give back_door a stream alias and restrict limited_user to front_door only
        config = {
            "mqtt": {"host": "mqtt"},
            "auth": {
                "roles": {
                    "limited_user": ["front_door"],
                }
            },
            "cameras": {
                "front_door": {
                    "ffmpeg": {
                        "inputs": [
                            {"path": "rtsp://10.0.0.1:554/video", "roles": ["detect"]}
                        ]
                    },
                    "detect": {"height": 1080, "width": 1920, "fps": 5},
                },
                "back_door": {
                    "ffmpeg": {
                        "inputs": [
                            {"path": "rtsp://10.0.0.2:554/video", "roles": ["detect"]}
                        ]
                    },
                    "detect": {"height": 1080, "width": 1920, "fps": 5},
                    "live": {"streams": {"default": "back_door_main"}},
                },
            },
        }
        app = self._make_app(config)
        resp = self._get_stream(app, "back_door_main", role="limited_user")
        assert resp.status_code == 403, (
            f"limited_user should be denied on alias back_door_main; "
            f"got {resp.status_code}"
        )


class TestReviewSummaryAccess(BaseTestHttp):
    """Tests for POST /review/summarize/start/{start_ts}/end/{end_ts}.

    The summary correlates each flagged event with overlapping activity on
    other cameras, so it is gated on full camera access rather than scoped to
    the caller's cameras. These tests pin that decision so the dependency is
    not loosened without first scoping the query.

    GenAI is not configured in unit tests, so an authorized request returns 400
    while an unauthorized one is rejected with 403 before the handler runs.
    """

    def setUp(self):
        super().setUp([Event, ReviewSegment, Recordings])
        self.minimal_config = _MULTI_CAMERA_CONFIG
        self.app = super().create_app()

    def tearDown(self):
        self.app.dependency_overrides.clear()
        super().tearDown()

    def _summarize(self, allowed_cameras: list[str]):
        async def mock_cameras(request: Request):
            return allowed_cameras

        self.app.dependency_overrides[get_allowed_cameras_for_filter] = mock_cameras
        with AuthTestClient(self.app) as client:
            return client.post("/review/summarize/start/0/end/9999999999")

    def _assert_allowed(self, resp):
        assert resp.status_code not in (401, 403), (
            f"Caller should not be blocked; got {resp.status_code}"
        )

    def test_partial_camera_access_blocked(self):
        assert self._summarize(["front_door"]).status_code == 403

    def test_no_camera_access_blocked(self):
        assert self._summarize([]).status_code == 403

    def test_full_camera_access_allowed(self):
        # Covers admin and viewer, which always resolve to every camera, and a
        # custom role whose list happens to name them all.
        self._assert_allowed(self._summarize(["front_door", "back_door"]))

    def _summarize_as_role(self, role: str):
        """Summarize using the real role to allowed-cameras resolution."""
        self.app.dependency_overrides.pop(get_allowed_cameras_for_filter, None)
        with AuthTestClient(self.app) as client:
            return client.post(
                "/review/summarize/start/0/end/9999999999",
                headers={"remote-user": "test", "remote-role": role},
            )

    def test_viewer_role_allowed(self):
        # viewer is never camera restricted, so it resolves to every camera.
        self._assert_allowed(self._summarize_as_role("viewer"))

    def test_admin_role_allowed(self):
        self._assert_allowed(self._summarize_as_role("admin"))

    def test_restricted_role_blocked(self):
        assert self._summarize_as_role("limited_user").status_code == 403