"""
Unit tests for chat sessions router.

Tests chat endpoints including:
- Create chat session
- Send message
- List chat history
- Get session details
- End session
- Export chat
"""

import pytest


@pytest.mark.unit
class TestCreateChatSession:
    """Tests for creating chat sessions"""

    def test_create_session_success(self):
        """Test successfully creating chat session"""

        # Assert returns 201 with session

    def test_create_session_invalid_project(self):
        """Test creating session for non-existent project"""
        # Assert returns 404


@pytest.mark.unit
class TestSendMessage:
    """Tests for sending messages"""

    def test_send_message_success(self):
        """Test successfully sending message"""

        # Assert returns 200 with message

    def test_send_empty_message(self):
        """Test sending empty message"""
        # Assert returns 422

    def test_send_oversized_message(self):
        """Test sending oversized message"""

        # Assert returns 422

    def test_send_message_invalid_session(self):
        """Test sending to non-existent session"""
        # Assert returns 404


@pytest.mark.unit
class TestListChatHistory:
    """Tests for listing chat history"""

    def test_list_session_messages(self):
        """Test listing messages in session"""
        # Assert returns list of messages

    def test_list_with_pagination(self):
        """Test message pagination"""
        # Assert pagination works

    def test_list_preserves_order(self):
        """Test messages in correct order"""
        # Assert chronological order


@pytest.mark.unit
class TestGetSessionDetails:
    """Tests for session details"""

    def test_get_session_details(self):
        """Test getting session details"""
        # Assert returns session info

    def test_get_nonexistent_session(self):
        """Test getting non-existent session"""
        # Assert returns 404


@pytest.mark.unit
class TestEndSession:
    """Tests for ending sessions"""

    def test_end_session_success(self):
        """Test successfully ending session"""
        # Assert returns 200

    def test_end_nonexistent_session(self):
        """Test ending non-existent session"""
        # Assert returns 404


@pytest.mark.unit
class TestExportChat:
    """Tests for exporting chat"""

    def test_export_as_json(self):
        """Test exporting chat as JSON"""
        # Assert returns JSON

    def test_export_as_markdown(self):
        """Test exporting chat as Markdown"""
        # Assert returns Markdown

    def test_export_as_pdf(self):
        """Test exporting chat as PDF"""
        pass
