from unittest.mock import AsyncMock, MagicMock, patch

import pytest
from fastapi import FastAPI
from fastapi.testclient import TestClient

from litellm.proxy._types import LitellmUserRoles, UserAPIKeyAuth
from litellm.proxy.agent_endpoints import endpoints as agent_endpoints
from litellm.proxy.agent_endpoints.endpoints import (
    _check_agent_management_permission,
    get_agent_daily_activity,
    router,
    user_api_key_auth,
)
from litellm.types.agents import AgentResponse


def _sample_agent_card_params() -> dict:
    return {
        "protocolVersion": "1.0",
        "name": "Test Agent",
        "description": "desc",
        "url": "http://localhost",
        "version": "1.0.0",
        "capabilities": {"streaming": True},
        "defaultInputModes": ["text"],
        "defaultOutputModes": ["text"],
        "skills": [],
    }


def _sample_agent_config() -> dict:
    return {
        "agent_name": "Test Agent",
        "agent_card_params": _sample_agent_card_params(),
        "litellm_params": {"make_public": False},
    }


def _sample_agent_response(
    agent_id: str = "agent-123", agent_name: str = "Test Agent"
) -> AgentResponse:
    return AgentResponse(
        agent_id=agent_id,
        agent_name=agent_name,
        agent_card_params=_sample_agent_card_params(),
        litellm_params={"make_public": False},
    )


def _make_app_with_role(role: LitellmUserRoles) -> TestClient:
    """Create a TestClient where the auth dependency returns the given role."""
    test_app = FastAPI()
    test_app.include_router(router)
    test_app.dependency_overrides[user_api_key_auth] = lambda: UserAPIKeyAuth(
        user_id="test-user", user_role=role
    )
    return TestClient(test_app)


app = FastAPI()
app.include_router(router)
app.dependency_overrides[user_api_key_auth] = lambda: UserAPIKeyAuth(
    user_id="test-user", user_role=LitellmUserRoles.PROXY_ADMIN
)
client = TestClient(app)


@pytest.fixture
def mock_prisma_client():
    with patch("litellm.proxy.proxy_server.prisma_client") as mock:
        yield mock


@pytest.fixture
def mock_user_api_key_auth():
    with patch("litellm.proxy.agent_endpoints.endpoints.user_api_key_auth") as mock:
        mock.return_value = UserAPIKeyAuth(
            user_id="test-user", user_role=LitellmUserRoles.PROXY_ADMIN
        )
        yield mock


def test_update_agent_success(mock_prisma_client, mock_user_api_key_auth, monkeypatch):
    existing_agent = {
        "agent_id": "agent-123",
        "agent_name": "Existing Agent",
        "agent_card_params": _sample_agent_card_params(),
    }
    mock_prisma_client.db.litellm_agentstable.find_unique = AsyncMock(
        return_value=existing_agent
    )

    mock_registry = MagicMock()
    mock_registry.update_agent_in_db = AsyncMock(
        return_value=_sample_agent_response(agent_id="agent-123")
    )
    mock_registry.deregister_agent = MagicMock()
    mock_registry.register_agent = MagicMock()
    monkeypatch.setattr(agent_endpoints, "AGENT_REGISTRY", mock_registry)

    response = client.put(
        "/v1/agents/agent-123",
        json=_sample_agent_config(),
        headers={"Authorization": "Bearer test-key"},
    )

    assert response.status_code == 200
    assert response.json()["agent_id"] == "agent-123"
    assert response.json()["agent_name"] == "Test Agent"


def test_update_agent_not_found(
    mock_prisma_client, mock_user_api_key_auth, monkeypatch
):
    mock_prisma_client.db.litellm_agentstable.find_unique = AsyncMock(return_value=None)

    mock_registry = MagicMock()
    monkeypatch.setattr(agent_endpoints, "AGENT_REGISTRY", mock_registry)

    response = client.put(
        "/v1/agents/missing-agent",
        json=_sample_agent_config(),
        headers={"Authorization": "Bearer test-key"},
    )

    assert response.status_code == 404
    assert "Agent with ID missing-agent not found" in response.json()["detail"]


def test_get_agent_by_id_not_found(
    mock_prisma_client, mock_user_api_key_auth, monkeypatch
):
    mock_registry = MagicMock()
    mock_registry.get_agent_by_id = MagicMock(return_value=None)
    monkeypatch.setattr(agent_endpoints, "AGENT_REGISTRY", mock_registry)
    mock_prisma_client.db.litellm_agentstable.find_unique = AsyncMock(return_value=None)

    response = client.get(
        "/v1/agents/missing-agent", headers={"Authorization": "Bearer test-key"}
    )

    assert response.status_code == 404
    assert "Agent with ID missing-agent not found" in response.json()["detail"]


def test_delete_agent_not_found(
    mock_prisma_client, mock_user_api_key_auth, monkeypatch
):
    mock_prisma_client.db.litellm_agentstable.find_unique = AsyncMock(return_value=None)
    mock_registry = MagicMock()
    monkeypatch.setattr(agent_endpoints, "AGENT_REGISTRY", mock_registry)

    response = client.delete(
        "/v1/agents/missing-agent", headers={"Authorization": "Bearer test-key"}
    )

    assert response.status_code == 404
    assert "Agent with ID missing-agent not found in DB." in response.json()["detail"]


def test_agent_error_schema_consistency(
    mock_prisma_client, mock_user_api_key_auth, monkeypatch
):
    mock_registry = MagicMock()
    mock_registry.get_agent_by_id = MagicMock(return_value=None)
    mock_registry.update_agent_in_db = AsyncMock(side_effect=Exception("should not run"))
    mock_registry.delete_agent_from_db = AsyncMock(side_effect=Exception("should not run"))
    monkeypatch.setattr(agent_endpoints, "AGENT_REGISTRY", mock_registry)

    mock_prisma_client.db.litellm_agentstable.find_unique = AsyncMock(return_value=None)

    missing_agent_id = "missing-agent"
    responses = [
        client.get(
            f"/v1/agents/{missing_agent_id}",
            headers={"Authorization": "Bearer test-key"},
        ),
        client.put(
            f"/v1/agents/{missing_agent_id}",
            json=_sample_agent_config(),
            headers={"Authorization": "Bearer test-key"},
        ),
        client.delete(
            f"/v1/agents/{missing_agent_id}",
            headers={"Authorization": "Bearer test-key"},
        ),
    ]

    for resp in responses:
        assert resp.status_code == 404
        detail = resp.json()["detail"]
        assert isinstance(detail, str)
        assert missing_agent_id in detail


@pytest.mark.asyncio
async def test_get_agent_daily_activity_admin_param_passing(monkeypatch):
    mock_prisma = AsyncMock()
    mock_prisma.db.litellm_agentstable.find_many = AsyncMock(return_value=[])
    monkeypatch.setattr("litellm.proxy.proxy_server.prisma_client", mock_prisma)

    mocked_response = MagicMock(name="SpendAnalyticsPaginatedResponse")
    get_daily_activity_mock = AsyncMock(return_value=mocked_response)
    monkeypatch.setattr(agent_endpoints, "get_daily_activity", get_daily_activity_mock)

    auth = UserAPIKeyAuth(user_role=LitellmUserRoles.PROXY_ADMIN, user_id="admin1")
    result = await get_agent_daily_activity(
        agent_ids="agent-1,agent-2",
        start_date="2024-01-01",
        end_date="2024-01-31",
        model="gpt-4",
        api_key="test-key",
        page=2,
        page_size=5,
        exclude_agent_ids="agent-3",
        user_api_key_dict=auth,
    )

    get_daily_activity_mock.assert_awaited_once()
    kwargs = get_daily_activity_mock.call_args.kwargs
    assert kwargs["table_name"] == "litellm_dailyagentspend"
    assert kwargs["entity_id_field"] == "agent_id"
    assert kwargs["entity_id"] == ["agent-1", "agent-2"]
    assert kwargs["exclude_entity_ids"] == ["agent-3"]
    assert kwargs["start_date"] == "2024-01-01"
    assert kwargs["end_date"] == "2024-01-31"
    assert kwargs["model"] == "gpt-4"
    assert kwargs["api_key"] == "test-key"
    assert kwargs["page"] == 2
    assert kwargs["page_size"] == 5
    assert result is mocked_response


@pytest.mark.asyncio
async def test_get_agent_daily_activity_with_agent_names(monkeypatch):
    mock_prisma = AsyncMock()
    mock_agent1 = MagicMock()
    mock_agent1.agent_id = "agent-1"
    mock_agent1.agent_name = "First Agent"
    mock_agent2 = MagicMock()
    mock_agent2.agent_id = "agent-2"
    mock_agent2.agent_name = "Second Agent"

    mock_prisma.db.litellm_agentstable.find_many = AsyncMock(
        return_value=[mock_agent1, mock_agent2]
    )
    monkeypatch.setattr("litellm.proxy.proxy_server.prisma_client", mock_prisma)

    mocked_response = MagicMock(name="SpendAnalyticsPaginatedResponse")
    get_daily_activity_mock = AsyncMock(return_value=mocked_response)
    monkeypatch.setattr(agent_endpoints, "get_daily_activity", get_daily_activity_mock)

    auth = UserAPIKeyAuth(user_role=LitellmUserRoles.PROXY_ADMIN, user_id="admin1")
    await get_agent_daily_activity(
        agent_ids="agent-1,agent-2",
        start_date="2024-01-01",
        end_date="2024-01-31",
        model=None,
        api_key=None,
        page=1,
        page_size=10,
        exclude_agent_ids=None,
        user_api_key_dict=auth,
    )

    kwargs = get_daily_activity_mock.call_args.kwargs
    assert kwargs["entity_metadata_field"] == {
        "agent-1": {"agent_name": "First Agent"},
        "agent-2": {"agent_name": "Second Agent"},
    }


# ---------- RBAC enforcement tests ----------


class TestAgentRBACInternalUser:
    """Internal users should be able to read agents but not create/update/delete."""

    @pytest.fixture(autouse=True)
    def _setup(self, monkeypatch):
        self.internal_client = _make_app_with_role(LitellmUserRoles.INTERNAL_USER)
        self.mock_registry = MagicMock()
        monkeypatch.setattr(agent_endpoints, "AGENT_REGISTRY", self.mock_registry)

    def test_should_allow_internal_user_to_list_agents(self, monkeypatch):
        self.mock_registry.get_agent_list = MagicMock(return_value=[])
        resp = self.internal_client.get(
            "/v1/agents", headers={"Authorization": "Bearer k"}
        )
        assert resp.status_code == 200

    def test_should_allow_internal_user_to_get_agent_by_id(self, monkeypatch):
        self.mock_registry.get_agent_by_id = MagicMock(
            return_value=_sample_agent_response()
        )
        with patch("litellm.proxy.proxy_server.prisma_client") as mock_prisma:
            resp = self.internal_client.get(
                "/v1/agents/agent-123", headers={"Authorization": "Bearer k"}
            )
        assert resp.status_code == 200

    def test_should_block_internal_user_from_creating_agent(self):
        resp = self.internal_client.post(
            "/v1/agents",
            json=_sample_agent_config(),
            headers={"Authorization": "Bearer k"},
        )
        assert resp.status_code == 403
        assert "Only proxy admins" in resp.json()["detail"]["error"]

    def test_should_block_internal_user_from_updating_agent(self):
        resp = self.internal_client.put(
            "/v1/agents/agent-123",
            json=_sample_agent_config(),
            headers={"Authorization": "Bearer k"},
        )
        assert resp.status_code == 403

    def test_should_block_internal_user_from_patching_agent(self):
        resp = self.internal_client.patch(
            "/v1/agents/agent-123",
            json={"agent_name": "new-name"},
            headers={"Authorization": "Bearer k"},
        )
        assert resp.status_code == 403

    def test_should_block_internal_user_from_deleting_agent(self):
        resp = self.internal_client.delete(
            "/v1/agents/agent-123", headers={"Authorization": "Bearer k"}
        )
        assert resp.status_code == 403


class TestAgentRBACInternalUserViewOnly:
    """View-only internal users should only be able to read agents."""

    @pytest.fixture(autouse=True)
    def _setup(self, monkeypatch):
        self.viewer_client = _make_app_with_role(
            LitellmUserRoles.INTERNAL_USER_VIEW_ONLY
        )
        self.mock_registry = MagicMock()
        monkeypatch.setattr(agent_endpoints, "AGENT_REGISTRY", self.mock_registry)

    def test_should_allow_view_only_user_to_list_agents(self):
        self.mock_registry.get_agent_list = MagicMock(return_value=[])
        resp = self.viewer_client.get(
            "/v1/agents", headers={"Authorization": "Bearer k"}
        )
        assert resp.status_code == 200

    def test_should_block_view_only_user_from_creating_agent(self):
        resp = self.viewer_client.post(
            "/v1/agents",
            json=_sample_agent_config(),
            headers={"Authorization": "Bearer k"},
        )
        assert resp.status_code == 403

    def test_should_block_view_only_user_from_deleting_agent(self):
        resp = self.viewer_client.delete(
            "/v1/agents/agent-123", headers={"Authorization": "Bearer k"}
        )
        assert resp.status_code == 403


class TestAgentRBACProxyAdmin:
    """Proxy admins should have full CRUD access to agents."""

    @pytest.fixture(autouse=True)
    def _setup(self, monkeypatch):
        self.admin_client = _make_app_with_role(LitellmUserRoles.PROXY_ADMIN)
        self.mock_registry = MagicMock()
        monkeypatch.setattr(agent_endpoints, "AGENT_REGISTRY", self.mock_registry)

    def test_should_allow_admin_to_create_agent(self, monkeypatch):
        with patch("litellm.proxy.proxy_server.prisma_client") as mock_prisma:
            self.mock_registry.get_agent_by_name = MagicMock(return_value=None)
            self.mock_registry.add_agent_to_db = AsyncMock(
                return_value=_sample_agent_response()
            )
            self.mock_registry.register_agent = MagicMock()
            resp = self.admin_client.post(
                "/v1/agents",
                json=_sample_agent_config(),
                headers={"Authorization": "Bearer k"},
            )
            assert resp.status_code == 200

    def test_should_allow_admin_to_delete_agent(self):
        existing = {
            "agent_id": "agent-123",
            "agent_name": "Existing Agent",
            "agent_card_params": _sample_agent_card_params(),
        }
        with patch("litellm.proxy.proxy_server.prisma_client") as mock_prisma:
            mock_prisma.db.litellm_agentstable.find_unique = AsyncMock(
                return_value=existing
            )
            self.mock_registry.delete_agent_from_db = AsyncMock()
            self.mock_registry.deregister_agent = MagicMock()
            resp = self.admin_client.delete(
                "/v1/agents/agent-123", headers={"Authorization": "Bearer k"}
            )
            assert resp.status_code == 200


class TestCheckAgentManagementPermission:
    """Unit tests for the _check_agent_management_permission helper."""

    def test_should_allow_proxy_admin(self):
        auth = UserAPIKeyAuth(
            user_id="admin", user_role=LitellmUserRoles.PROXY_ADMIN
        )
        _check_agent_management_permission(auth)

    @pytest.mark.parametrize(
        "role",
        [
            LitellmUserRoles.INTERNAL_USER,
            LitellmUserRoles.INTERNAL_USER_VIEW_ONLY,
            LitellmUserRoles.PROXY_ADMIN_VIEW_ONLY,
        ],
    )
    def test_should_block_non_admin_roles(self, role):
        from fastapi import HTTPException

        auth = UserAPIKeyAuth(user_id="user", user_role=role)
        with pytest.raises(HTTPException) as exc_info:
            _check_agent_management_permission(auth)
        assert exc_info.value.status_code == 403


class TestAgentRoutesIncludesAgentIdPattern:
    """Verify that agent_routes includes the {agent_id} pattern for route access."""

    def test_should_include_agent_id_pattern(self):
        from litellm.proxy._types import LiteLLMRoutes

        assert "/v1/agents/{agent_id}" in LiteLLMRoutes.agent_routes.value


class TestAgentHealthCheck:
    """Tests for the health_check query parameter on GET /v1/agents."""

    @pytest.fixture(autouse=True)
    def _setup(self, monkeypatch):
        from litellm.proxy.agent_endpoints import agent_registry as ar_mod

        self.admin_client = _make_app_with_role(LitellmUserRoles.PROXY_ADMIN)
        self.mock_registry = MagicMock()
        monkeypatch.setattr(ar_mod, "global_agent_registry", self.mock_registry)

    def _make_agent(self, agent_id: str, url: str | None = None) -> AgentResponse:
        card = _sample_agent_card_params()
        if url is not None:
            card["url"] = url
        else:
            card.pop("url", None)
        return AgentResponse(
            agent_id=agent_id,
            agent_name=f"Agent {agent_id}",
            agent_card_params=card,
            litellm_params={},
        )

    def test_should_return_all_agents_when_health_check_disabled(self):
        agents = [self._make_agent("a1", "http://reachable"), self._make_agent("a2", "http://unreachable")]
        self.mock_registry.get_agent_list = MagicMock(return_value=agents)

        resp = self.admin_client.get(
            "/v1/agents", headers={"Authorization": "Bearer k"}
        )
        assert resp.status_code == 200
        assert len(resp.json()) == 2

    def test_should_filter_unhealthy_agents_when_health_check_enabled(self, monkeypatch):
        agents = [
            self._make_agent("a1", "http://reachable"),
            self._make_agent("a2", "http://unreachable"),
        ]
        self.mock_registry.get_agent_list = MagicMock(return_value=agents)

        results = iter([
            {"agent_id": "a1", "healthy": True},
            {"agent_id": "a2", "healthy": False, "error": "Connection refused"},
        ])
        monkeypatch.setattr(
            agent_endpoints,
            "_check_agent_url_health",
            AsyncMock(side_effect=lambda agent: next(results)),
        )

        resp = self.admin_client.get(
            "/v1/agents?health_check=true",
            headers={"Authorization": "Bearer k"},
        )
        assert resp.status_code == 200
        data = resp.json()
        assert len(data) == 1
        assert data[0]["agent_id"] == "a1"

    def test_should_return_empty_list_when_all_agents_unhealthy(self, monkeypatch):
        agents = [self._make_agent("a1", "http://down")]
        self.mock_registry.get_agent_list = MagicMock(return_value=agents)
        monkeypatch.setattr(
            agent_endpoints,
            "_check_agent_url_health",
            AsyncMock(return_value={"agent_id": "a1", "healthy": False, "error": "timeout"}),
        )

        resp = self.admin_client.get(
            "/v1/agents?health_check=true",
            headers={"Authorization": "Bearer k"},
        )
        assert resp.status_code == 200
        assert len(resp.json()) == 0

    def test_should_return_all_agents_when_all_healthy(self, monkeypatch):
        agents = [self._make_agent("a1", "http://ok1"), self._make_agent("a2", "http://ok2")]
        self.mock_registry.get_agent_list = MagicMock(return_value=agents)

        results = iter([
            {"agent_id": "a1", "healthy": True},
            {"agent_id": "a2", "healthy": True},
        ])
        monkeypatch.setattr(
            agent_endpoints,
            "_check_agent_url_health",
            AsyncMock(side_effect=lambda agent: next(results)),
        )

        resp = self.admin_client.get(
            "/v1/agents?health_check=true",
            headers={"Authorization": "Bearer k"},
        )
        assert resp.status_code == 200
        assert len(resp.json()) == 2


class TestCheckAgentUrlHealth:
    """Unit tests for the _check_agent_url_health helper."""

    @pytest.mark.asyncio
    async def test_should_return_healthy_when_no_url(self):
        from litellm.proxy.agent_endpoints.endpoints import _check_agent_url_health

        agent = AgentResponse(
            agent_id="no-url",
            agent_name="No URL Agent",
            agent_card_params={"name": "test"},
            litellm_params={},
        )
        result = await _check_agent_url_health(agent)
        assert result["healthy"] is True
        assert "error" not in result

    @pytest.mark.asyncio
    @patch("litellm.proxy.agent_endpoints.endpoints.get_async_httpx_client")
    async def test_should_return_healthy_for_200(self, mock_get_client):
        from litellm.proxy.agent_endpoints.endpoints import _check_agent_url_health

        mock_response = MagicMock()
        mock_response.status_code = 200
        mock_client = AsyncMock()
        mock_client.get = AsyncMock(return_value=mock_response)
        mock_get_client.return_value = mock_client

        agent = AgentResponse(
            agent_id="ok",
            agent_name="OK Agent",
            agent_card_params={"url": "http://example.com"},
            litellm_params={},
        )
        result = await _check_agent_url_health(agent)
        assert result["healthy"] is True

    @pytest.mark.asyncio
    @patch("litellm.proxy.agent_endpoints.endpoints.get_async_httpx_client")
    async def test_should_return_unhealthy_for_500(self, mock_get_client):
        from litellm.proxy.agent_endpoints.endpoints import _check_agent_url_health

        mock_response = MagicMock()
        mock_response.status_code = 500
        mock_client = AsyncMock()
        mock_client.get = AsyncMock(return_value=mock_response)
        mock_get_client.return_value = mock_client

        agent = AgentResponse(
            agent_id="err",
            agent_name="Error Agent",
            agent_card_params={"url": "http://failing.com"},
            litellm_params={},
        )
        result = await _check_agent_url_health(agent)
        assert result["healthy"] is False
        assert "HTTP 500" in result["error"]

    @pytest.mark.asyncio
    @patch("litellm.proxy.agent_endpoints.endpoints.get_async_httpx_client")
    async def test_should_return_unhealthy_on_connection_error(self, mock_get_client):
        from litellm.proxy.agent_endpoints.endpoints import _check_agent_url_health

        mock_client = AsyncMock()
        mock_client.get = AsyncMock(side_effect=Exception("Connection refused"))
        mock_get_client.return_value = mock_client

        agent = AgentResponse(
            agent_id="down",
            agent_name="Down Agent",
            agent_card_params={"url": "http://down.com"},
            litellm_params={},
        )
        result = await _check_agent_url_health(agent)
        assert result["healthy"] is False
        assert "Connection refused" in result["error"]

    @pytest.mark.asyncio
    @patch("litellm.proxy.agent_endpoints.endpoints.get_async_httpx_client")
    async def test_should_treat_404_as_healthy(self, mock_get_client):
        """A 404 means the server is reachable, just not the specific path."""
        from litellm.proxy.agent_endpoints.endpoints import _check_agent_url_health

        mock_response = MagicMock()
        mock_response.status_code = 404
        mock_client = AsyncMock()
        mock_client.get = AsyncMock(return_value=mock_response)
        mock_get_client.return_value = mock_client

        agent = AgentResponse(
            agent_id="notfound",
            agent_name="NotFound Agent",
            agent_card_params={"url": "http://example.com/missing"},
            litellm_params={},
        )
        result = await _check_agent_url_health(agent)
        assert result["healthy"] is True