"""Integration tests for chat API endpoints.

Tests all chat endpoints with mocked services.
"""

from datetime import datetime
from unittest.mock import AsyncMock, patch
from uuid import uuid4

import pytest
from fastapi.testclient import TestClient

from notebooklm_agent.api.main import app
from notebooklm_agent.api.models.responses import ChatMessage, ChatResponse, SourceReference


@pytest.mark.unit
class TestSendMessageEndpoint:
    """Test suite for POST /api/v1/notebooks/{id}/chat endpoint."""

    def test_send_message_returns_200(self):
        """Should return 200 with chat response."""
        # Arrange
        client = TestClient(app)
        notebook_id = str(uuid4())

        with patch("notebooklm_agent.api.routes.chat.ChatService") as mock_service_class:
            mock_service = AsyncMock()
            mock_response = ChatResponse(
                message="This is the answer based on your sources.",
                sources=[
                    SourceReference(
                        source_id=str(uuid4()),
                        title="Example Source",
                        snippet="Relevant text",
                    )
                ],
                timestamp=datetime.utcnow(),
            )
            mock_service.send_message.return_value = mock_response
            mock_service_class.return_value = mock_service

            # Act
            response = client.post(
                f"/api/v1/notebooks/{notebook_id}/chat",
                json={"message": "What are the key points?", "include_references": True},
            )

            # Assert
            assert response.status_code == 200
            data = response.json()
            assert data["success"] is True
            assert "answer based on your sources" in data["data"]["message"]
            assert len(data["data"]["sources"]) == 1

    def test_send_message_invalid_notebook_id_returns_400(self):
        """Should return 400 for invalid notebook ID."""
        # Arrange
        client = TestClient(app)

        # Act
        response = client.post(
            "/api/v1/notebooks/invalid-id/chat",
            json={"message": "Question?"},
        )

        # Assert
        assert response.status_code in [400, 422]

    def test_send_message_empty_message_returns_400(self):
        """Should return 400 for empty message."""
        # Arrange
        client = TestClient(app)
        notebook_id = str(uuid4())

        with patch("notebooklm_agent.api.routes.chat.ChatService") as mock_service_class:
            mock_service = AsyncMock()
            from notebooklm_agent.core.exceptions import ValidationError

            mock_service.send_message.side_effect = ValidationError("Message cannot be empty")
            mock_service_class.return_value = mock_service

            # Act
            response = client.post(
                f"/api/v1/notebooks/{notebook_id}/chat",
                json={"message": ""},
            )

            # Assert
            assert response.status_code in [400, 422]

    def test_send_message_notebook_not_found_returns_404(self):
        """Should return 404 when notebook not found."""
        # Arrange
        client = TestClient(app)
        notebook_id = str(uuid4())

        with patch("notebooklm_agent.api.routes.chat.ChatService") as mock_service_class:
            mock_service = AsyncMock()
            from notebooklm_agent.core.exceptions import NotFoundError

            mock_service.send_message.side_effect = NotFoundError("Notebook", notebook_id)
            mock_service_class.return_value = mock_service

            # Act
            response = client.post(
                f"/api/v1/notebooks/{notebook_id}/chat",
                json={"message": "Question?"},
            )

            # Assert
            assert response.status_code == 404


@pytest.mark.unit
class TestGetChatHistoryEndpoint:
    """Test suite for GET /api/v1/notebooks/{id}/chat/history endpoint."""

    def test_get_history_returns_200(self):
        """Should return 200 with chat history."""
        # Arrange
        client = TestClient(app)
        notebook_id = str(uuid4())

        with patch("notebooklm_agent.api.routes.chat.ChatService") as mock_service_class:
            mock_service = AsyncMock()
            mock_message = ChatMessage(
                id=str(uuid4()),
                role="user",
                content="What are the key points?",
                timestamp=datetime.utcnow(),
                sources=None,
            )
            mock_service.get_history.return_value = [mock_message]
            mock_service_class.return_value = mock_service

            # Act
            response = client.get(f"/api/v1/notebooks/{notebook_id}/chat/history")

            # Assert
            assert response.status_code == 200
            data = response.json()
            assert data["success"] is True
            assert len(data["data"]) == 1
            assert data["data"][0]["role"] == "user"

    def test_get_history_empty_returns_empty_list(self):
        """Should return empty list if no history."""
        # Arrange
        client = TestClient(app)
        notebook_id = str(uuid4())

        with patch("notebooklm_agent.api.routes.chat.ChatService") as mock_service_class:
            mock_service = AsyncMock()
            mock_service.get_history.return_value = []
            mock_service_class.return_value = mock_service

            # Act
            response = client.get(f"/api/v1/notebooks/{notebook_id}/chat/history")

            # Assert
            assert response.status_code == 200
            data = response.json()
            assert data["success"] is True
            assert data["data"] == []

    def test_get_history_invalid_notebook_id_returns_400(self):
        """Should return 400 for invalid notebook ID."""
        # Arrange
        client = TestClient(app)

        # Act
        response = client.get("/api/v1/notebooks/invalid-id/chat/history")

        # Assert
        assert response.status_code in [400, 422]

    def test_get_history_notebook_not_found_returns_404(self):
        """Should return 404 when notebook not found."""
        # Arrange
        client = TestClient(app)
        notebook_id = str(uuid4())

        with patch("notebooklm_agent.api.routes.chat.ChatService") as mock_service_class:
            mock_service = AsyncMock()
            from notebooklm_agent.core.exceptions import NotFoundError

            mock_service.get_history.side_effect = NotFoundError("Notebook", notebook_id)
            mock_service_class.return_value = mock_service

            # Act
            response = client.get(f"/api/v1/notebooks/{notebook_id}/chat/history")

            # Assert
            assert response.status_code == 404