"""Tests for notebooks API routes.

TDD for DEV-002: POST /api/v1/notebooks
TDD for DEV-003: GET /api/v1/notebooks
"""

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

import pytest
from fastapi.testclient import TestClient

from notebooklm_agent.api.main import app
from notebooklm_agent.core.exceptions import ValidationError


@pytest.mark.unit
class TestCreateNotebookEndpoint:
    """Test suite for POST /api/v1/notebooks endpoint."""

    def test_create_notebook_valid_data_returns_201(self):
        """Should return 201 Created for valid notebook data."""
        # Arrange
        client = TestClient(app)
        notebook_id = str(uuid4())

        with patch("notebooklm_agent.api.routes.notebooks.NotebookService") as mock_service_class:
            mock_service = AsyncMock()
            mock_response = MagicMock()
            mock_response.id = notebook_id
            mock_response.title = "Test Notebook"
            mock_response.description = None
            mock_response.created_at = datetime.utcnow()
            mock_response.updated_at = datetime.utcnow()
            mock_service.create.return_value = mock_response
            mock_service_class.return_value = mock_service

            # Act
            response = client.post(
                "/api/v1/notebooks",
                json={"title": "Test Notebook", "description": None},
            )

            # Assert
            assert response.status_code == 201
            data = response.json()
            assert data["success"] is True
            assert data["data"]["title"] == "Test Notebook"
            assert data["data"]["id"] == notebook_id

    def test_create_notebook_with_description_returns_201(self):
        """Should return 201 for notebook with description."""
        # Arrange
        client = TestClient(app)
        notebook_id = str(uuid4())

        with patch("notebooklm_agent.api.routes.notebooks.NotebookService") as mock_service_class:
            mock_service = AsyncMock()
            mock_response = MagicMock()
            mock_response.id = notebook_id
            mock_response.title = "Test Notebook"
            mock_response.description = "A description"
            mock_response.created_at = datetime.utcnow()
            mock_response.updated_at = datetime.utcnow()
            mock_service.create.return_value = mock_response
            mock_service_class.return_value = mock_service

            # Act
            response = client.post(
                "/api/v1/notebooks",
                json={"title": "Test Notebook", "description": "A description"},
            )

            # Assert
            assert response.status_code == 201
            data = response.json()
            assert data["data"]["description"] == "A description"

    def test_create_notebook_short_title_returns_400(self):
        """Should return 400 for title too short."""
        # Arrange
        client = TestClient(app)

        with patch("notebooklm_agent.api.routes.notebooks.NotebookService") as mock_service_class:
            mock_service = AsyncMock()
            mock_service.create.side_effect = ValidationError("Title must be at least 3 characters")
            mock_service_class.return_value = mock_service

            # Act
            response = client.post(
                "/api/v1/notebooks",
                json={"title": "AB", "description": None},
            )

            # Assert
            assert response.status_code == 400
            data = response.json()
            assert data["success"] is False
            assert data["error"]["code"] == "VALIDATION_ERROR"

    def test_create_notebook_missing_title_returns_422(self):
        """Should return 422 for missing title (Pydantic validation)."""
        # Arrange
        client = TestClient(app)

        # Act
        response = client.post(
            "/api/v1/notebooks",
            json={"description": "A description"},
        )

        # Assert
        assert response.status_code == 422
        data = response.json()
        assert "detail" in data

    def test_create_notebook_empty_title_returns_400(self):
        """Should return 400 for empty title."""
        # Arrange
        client = TestClient(app)

        with patch("notebooklm_agent.api.routes.notebooks.NotebookService") as mock_service_class:
            mock_service = AsyncMock()
            mock_service.create.side_effect = ValidationError("Title cannot be empty")
            mock_service_class.return_value = mock_service

            # Act
            response = client.post(
                "/api/v1/notebooks",
                json={"title": "", "description": None},
            )

            # Assert
            assert response.status_code == 400
            data = response.json()
            assert data["success"] is False

    def test_create_notebook_response_has_meta(self):
        """Should include meta in response."""
        # Arrange
        client = TestClient(app)
        notebook_id = str(uuid4())

        with patch("notebooklm_agent.api.routes.notebooks.NotebookService") as mock_service_class:
            mock_service = AsyncMock()
            mock_response = MagicMock()
            mock_response.id = notebook_id
            mock_response.title = "Test Notebook"
            mock_response.description = None
            mock_response.created_at = datetime.utcnow()
            mock_response.updated_at = datetime.utcnow()
            mock_service.create.return_value = mock_response
            mock_service_class.return_value = mock_service

            # Act
            response = client.post(
                "/api/v1/notebooks",
                json={"title": "Test Notebook", "description": None},
            )

            # Assert
            assert response.status_code == 201
            data = response.json()
            assert "meta" in data
            assert "timestamp" in data["meta"]
            assert "request_id" in data["meta"]


@pytest.mark.unit
class TestListNotebooksEndpoint:
    """Test suite for GET /api/v1/notebooks endpoint."""

    def test_list_notebooks_returns_200(self):
        """Should return 200 with list of notebooks."""
        # Arrange
        client = TestClient(app)

        with patch("notebooklm_agent.api.routes.notebooks.NotebookService") as mock_service_class:
            mock_service = AsyncMock()
            mock_notebook = MagicMock()
            mock_notebook.id = str(uuid4())
            mock_notebook.title = "Notebook 1"
            mock_notebook.description = None
            mock_notebook.created_at = datetime.utcnow()
            mock_notebook.updated_at = datetime.utcnow()

            mock_paginated = MagicMock()
            mock_paginated.items = [mock_notebook]
            mock_paginated.pagination.total = 1
            mock_paginated.pagination.limit = 20
            mock_paginated.pagination.offset = 0
            mock_paginated.pagination.has_more = False

            mock_service.list.return_value = mock_paginated
            mock_service_class.return_value = mock_service

            # Act
            response = client.get("/api/v1/notebooks")

            # Assert
            assert response.status_code == 200
            data = response.json()
            assert data["success"] is True
            assert len(data["data"]["items"]) == 1
            assert data["data"]["pagination"]["total"] == 1

    def test_list_notebooks_with_pagination_returns_correct_page(self):
        """Should return correct page with limit and offset."""
        # Arrange
        client = TestClient(app)

        with patch("notebooklm_agent.api.routes.notebooks.NotebookService") as mock_service_class:
            mock_service = AsyncMock()
            mock_paginated = MagicMock()
            mock_paginated.items = []
            mock_paginated.pagination.total = 100
            mock_paginated.pagination.limit = 10
            mock_paginated.pagination.offset = 20
            mock_paginated.pagination.has_more = True

            mock_service.list.return_value = mock_paginated
            mock_service_class.return_value = mock_service

            # Act
            response = client.get("/api/v1/notebooks?limit=10&offset=20")

            # Assert
            assert response.status_code == 200
            data = response.json()
            assert data["data"]["pagination"]["limit"] == 10
            assert data["data"]["pagination"]["offset"] == 20
            assert data["data"]["pagination"]["has_more"] is True

    def test_list_notebooks_with_sort_returns_sorted(self):
        """Should sort notebooks by specified field."""
        # Arrange
        client = TestClient(app)

        with patch("notebooklm_agent.api.routes.notebooks.NotebookService") as mock_service_class:
            mock_service = AsyncMock()
            mock_paginated = MagicMock()
            mock_paginated.items = []
            mock_paginated.pagination.total = 0
            mock_paginated.pagination.limit = 20
            mock_paginated.pagination.offset = 0
            mock_paginated.pagination.has_more = False

            mock_service.list.return_value = mock_paginated
            mock_service_class.return_value = mock_service

            # Act
            response = client.get("/api/v1/notebooks?sort=title&order=asc")

            # Assert
            assert response.status_code == 200
            mock_service.list.assert_called_once_with(limit=20, offset=0, sort="title", order="asc")

    def test_list_notebooks_empty_list_returns_200(self):
        """Should return 200 with empty list when no notebooks."""
        # Arrange
        client = TestClient(app)

        with patch("notebooklm_agent.api.routes.notebooks.NotebookService") as mock_service_class:
            mock_service = AsyncMock()
            mock_paginated = MagicMock()
            mock_paginated.items = []
            mock_paginated.pagination.total = 0
            mock_paginated.pagination.limit = 20
            mock_paginated.pagination.offset = 0
            mock_paginated.pagination.has_more = False

            mock_service.list.return_value = mock_paginated
            mock_service_class.return_value = mock_service

            # Act
            response = client.get("/api/v1/notebooks")

            # Assert
            assert response.status_code == 200
            data = response.json()
            assert data["data"]["items"] == []
            assert data["data"]["pagination"]["total"] == 0

    def test_list_notebooks_invalid_limit_returns_422(self):
        """Should return 422 for invalid limit parameter."""
        # Arrange
        client = TestClient(app)

        # Act
        response = client.get("/api/v1/notebooks?limit=200")

        # Assert
        assert response.status_code == 422

    def test_list_notebooks_invalid_sort_returns_422(self):
        """Should return 422 for invalid sort parameter."""
        # Arrange
        client = TestClient(app)

        # Act
        response = client.get("/api/v1/notebooks?sort=invalid_field")

        # Assert
        assert response.status_code == 422


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

    def test_get_notebook_existing_id_returns_200(self):
        """Should return 200 with notebook for existing ID."""
        # Arrange
        client = TestClient(app)
        notebook_id = str(uuid4())

        with patch("notebooklm_agent.api.routes.notebooks.NotebookService") as mock_service_class:
            mock_service = AsyncMock()
            mock_response = MagicMock()
            mock_response.id = notebook_id
            mock_response.title = "Test Notebook"
            mock_response.description = "A description"
            mock_response.created_at = datetime.utcnow()
            mock_response.updated_at = datetime.utcnow()
            mock_service.get.return_value = mock_response
            mock_service_class.return_value = mock_service

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

            # Assert
            assert response.status_code == 200
            data = response.json()
            assert data["success"] is True
            assert data["data"]["id"] == notebook_id
            assert data["data"]["title"] == "Test Notebook"

    def test_get_notebook_nonexistent_id_returns_404(self):
        """Should return 404 for non-existent notebook ID."""
        # Arrange
        client = TestClient(app)
        notebook_id = str(uuid4())

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

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

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

            # Assert
            assert response.status_code == 404
            data = response.json()
            assert data["success"] is False
            assert data["error"]["code"] == "NOT_FOUND"

    def test_get_notebook_invalid_uuid_returns_400(self):
        """Should return 400 for invalid UUID format."""
        # Arrange
        client = TestClient(app)

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

        # Assert
        assert response.status_code == 400

    def test_get_notebook_response_has_meta(self):
        """Should include meta in response."""
        # Arrange
        client = TestClient(app)
        notebook_id = str(uuid4())

        with patch("notebooklm_agent.api.routes.notebooks.NotebookService") as mock_service_class:
            mock_service = AsyncMock()
            mock_response = MagicMock()
            mock_response.id = notebook_id
            mock_response.title = "Test Notebook"
            mock_response.description = None
            mock_response.created_at = datetime.utcnow()
            mock_response.updated_at = datetime.utcnow()
            mock_service.get.return_value = mock_response
            mock_service_class.return_value = mock_service

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

            # Assert
            assert response.status_code == 200
            data = response.json()
            assert "meta" in data
            assert "timestamp" in data["meta"]
            assert "request_id" in data["meta"]


@pytest.mark.unit
class TestDeleteNotebookEndpoint:
    """Test suite for DELETE /api/v1/notebooks/{id} endpoint."""

    def test_delete_notebook_valid_id_returns_204(self):
        """Should return 204 No Content for valid notebook ID."""
        # Arrange
        client = TestClient(app)
        notebook_id = str(uuid4())

        with patch("notebooklm_agent.api.routes.notebooks.NotebookService") as mock_service_class:
            mock_service = AsyncMock()
            mock_service.delete.return_value = None
            mock_service_class.return_value = mock_service

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

            # Assert
            assert response.status_code == 204
            assert response.content == b""

    def test_delete_notebook_nonexistent_id_returns_404(self):
        """Should return 404 for non-existent notebook ID."""
        # Arrange
        client = TestClient(app)
        notebook_id = str(uuid4())

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

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

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

            # Assert
            assert response.status_code == 404
            data = response.json()
            assert data["detail"]["success"] is False
            assert data["detail"]["error"]["code"] == "NOT_FOUND"

    def test_delete_notebook_invalid_uuid_returns_400(self):
        """Should return 400 for invalid UUID format."""
        # Arrange
        client = TestClient(app)

        # Act
        response = client.delete("/api/v1/notebooks/invalid-uuid")

        # Assert
        assert response.status_code == 400
        data = response.json()
        assert data["detail"]["success"] is False
        assert data["detail"]["error"]["code"] == "VALIDATION_ERROR"


@pytest.mark.unit
class TestUpdateNotebookEndpoint:
    """Test suite for PATCH /api/v1/notebooks/{id} endpoint."""

    def test_update_notebook_title_returns_200(self):
        """Should return 200 with updated notebook when updating title."""
        # Arrange
        client = TestClient(app)
        notebook_id = str(uuid4())

        with patch("notebooklm_agent.api.routes.notebooks.NotebookService") as mock_service_class:
            mock_service = AsyncMock()
            mock_response = MagicMock()
            mock_response.id = notebook_id
            mock_response.title = "Updated Title"
            mock_response.description = None
            mock_response.created_at = datetime.utcnow()
            mock_response.updated_at = datetime.utcnow()
            mock_service.update.return_value = mock_response
            mock_service_class.return_value = mock_service

            # Act
            response = client.patch(
                f"/api/v1/notebooks/{notebook_id}",
                json={"title": "Updated Title"},
            )

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

    def test_update_notebook_description_only_returns_200(self):
        """Should return 200 when updating only description."""
        # Arrange
        client = TestClient(app)
        notebook_id = str(uuid4())

        with patch("notebooklm_agent.api.routes.notebooks.NotebookService") as mock_service_class:
            mock_service = AsyncMock()
            mock_response = MagicMock()
            mock_response.id = notebook_id
            mock_response.title = "Original Title"
            mock_response.description = "New Description"
            mock_response.created_at = datetime.utcnow()
            mock_response.updated_at = datetime.utcnow()
            mock_service.update.return_value = mock_response
            mock_service_class.return_value = mock_service

            # Act
            response = client.patch(
                f"/api/v1/notebooks/{notebook_id}",
                json={"description": "New Description"},
            )

            # Assert
            assert response.status_code == 200
            data = response.json()
            assert data["data"]["description"] == "New Description"

    def test_update_notebook_both_fields_returns_200(self):
        """Should return 200 when updating both title and description."""
        # Arrange
        client = TestClient(app)
        notebook_id = str(uuid4())

        with patch("notebooklm_agent.api.routes.notebooks.NotebookService") as mock_service_class:
            mock_service = AsyncMock()
            mock_response = MagicMock()
            mock_response.id = notebook_id
            mock_response.title = "Updated Title"
            mock_response.description = "Updated Description"
            mock_response.created_at = datetime.utcnow()
            mock_response.updated_at = datetime.utcnow()
            mock_service.update.return_value = mock_response
            mock_service_class.return_value = mock_service

            # Act
            response = client.patch(
                f"/api/v1/notebooks/{notebook_id}",
                json={"title": "Updated Title", "description": "Updated Description"},
            )

            # Assert
            assert response.status_code == 200
            data = response.json()
            assert data["data"]["title"] == "Updated Title"
            assert data["data"]["description"] == "Updated Description"

    def test_update_notebook_nonexistent_id_returns_404(self):
        """Should return 404 for non-existent notebook ID."""
        # Arrange
        client = TestClient(app)
        notebook_id = str(uuid4())

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

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

            # Act
            response = client.patch(
                f"/api/v1/notebooks/{notebook_id}",
                json={"title": "Updated Title"},
            )

            # Assert
            assert response.status_code == 404
            data = response.json()
            assert data["success"] is False
            assert data["error"]["code"] == "NOT_FOUND"

    def test_update_notebook_invalid_title_returns_400(self):
        """Should return 400 for invalid title."""
        # Arrange
        client = TestClient(app)
        notebook_id = str(uuid4())

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

            mock_service.update.side_effect = ValidationError("Title too short")
            mock_service_class.return_value = mock_service

            # Act
            response = client.patch(
                f"/api/v1/notebooks/{notebook_id}",
                json={"title": "AB"},
            )

            # Assert
            assert response.status_code == 400
            data = response.json()
            assert data["success"] is False
            assert data["error"]["code"] == "VALIDATION_ERROR"

    def test_update_notebook_invalid_uuid_returns_400(self):
        """Should return 400 for invalid UUID format."""
        # Arrange
        client = TestClient(app)

        # Act
        response = client.patch(
            "/api/v1/notebooks/invalid-uuid",
            json={"title": "Updated Title"},
        )

        # Assert
        assert response.status_code == 400

    def test_update_notebook_empty_body_returns_200(self):
        """Should return 200 with unchanged notebook for empty body."""
        # Arrange
        client = TestClient(app)
        notebook_id = str(uuid4())

        with patch("notebooklm_agent.api.routes.notebooks.NotebookService") as mock_service_class:
            mock_service = AsyncMock()
            mock_response = MagicMock()
            mock_response.id = notebook_id
            mock_response.title = "Original Title"
            mock_response.description = "Original Description"
            mock_response.created_at = datetime.utcnow()
            mock_response.updated_at = datetime.utcnow()
            mock_service.update.return_value = mock_response
            mock_service_class.return_value = mock_service

            # Act
            response = client.patch(
                f"/api/v1/notebooks/{notebook_id}",
                json={},
            )

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