"""
Contract tests for authentication API endpoints
These tests define the expected behavior - they will FAIL until implementation is complete
"""
import pytest
from httpx import AsyncClient
from fastapi import status
from main import app


@pytest.mark.asyncio
class TestAuthLogin:
    """Contract tests for POST /api/v1/auth/login"""

    async def test_login_success(self, async_client: AsyncClient):
        """Test successful login with valid credentials"""
        response = await async_client.post(
            "/api/v1/auth/login",
            json={
                "username": "admin",
                "password": "admin123"
            }
        )

        assert response.status_code == status.HTTP_200_OK
        data = response.json()

        # Verify response structure
        assert "access_token" in data
        assert "refresh_token" in data
        assert "token_type" in data
        assert "expires_in" in data
        assert "user" in data

        # Verify token type
        assert data["token_type"] == "bearer"

        # Verify user info
        assert data["user"]["username"] == "admin"
        assert data["user"]["role"] == "administrator"
        assert "password_hash" not in data["user"]  # Never expose password hash

    async def test_login_invalid_username(self, async_client: AsyncClient):
        """Test login with non-existent username"""
        response = await async_client.post(
            "/api/v1/auth/login",
            json={
                "username": "nonexistent",
                "password": "somepassword"
            }
        )

        assert response.status_code == status.HTTP_401_UNAUTHORIZED
        data = response.json()
        assert "error" in data
        assert data["error"] == "Unauthorized"

    async def test_login_invalid_password(self, async_client: AsyncClient):
        """Test login with incorrect password"""
        response = await async_client.post(
            "/api/v1/auth/login",
            json={
                "username": "admin",
                "password": "wrongpassword"
            }
        )

        assert response.status_code == status.HTTP_401_UNAUTHORIZED
        data = response.json()
        assert "error" in data

    async def test_login_missing_username(self, async_client: AsyncClient):
        """Test login with missing username field"""
        response = await async_client.post(
            "/api/v1/auth/login",
            json={
                "password": "admin123"
            }
        )

        assert response.status_code == status.HTTP_422_UNPROCESSABLE_ENTITY

    async def test_login_missing_password(self, async_client: AsyncClient):
        """Test login with missing password field"""
        response = await async_client.post(
            "/api/v1/auth/login",
            json={
                "username": "admin"
            }
        )

        assert response.status_code == status.HTTP_422_UNPROCESSABLE_ENTITY

    async def test_login_empty_username(self, async_client: AsyncClient):
        """Test login with empty username"""
        response = await async_client.post(
            "/api/v1/auth/login",
            json={
                "username": "",
                "password": "admin123"
            }
        )

        assert response.status_code == status.HTTP_422_UNPROCESSABLE_ENTITY

    async def test_login_empty_password(self, async_client: AsyncClient):
        """Test login with empty password"""
        response = await async_client.post(
            "/api/v1/auth/login",
            json={
                "username": "admin",
                "password": ""
            }
        )

        assert response.status_code == status.HTTP_422_UNPROCESSABLE_ENTITY


@pytest.mark.asyncio
class TestAuthLogout:
    """Contract tests for POST /api/v1/auth/logout"""

    async def test_logout_success(self, async_client: AsyncClient, auth_token: str):
        """Test successful logout with valid token"""
        response = await async_client.post(
            "/api/v1/auth/logout",
            headers={"Authorization": f"Bearer {auth_token}"}
        )

        assert response.status_code == status.HTTP_200_OK
        data = response.json()
        assert data["message"] == "Successfully logged out"

    async def test_logout_no_token(self, async_client: AsyncClient):
        """Test logout without authentication token"""
        response = await async_client.post("/api/v1/auth/logout")

        assert response.status_code == status.HTTP_401_UNAUTHORIZED

    async def test_logout_invalid_token(self, async_client: AsyncClient):
        """Test logout with invalid token"""
        response = await async_client.post(
            "/api/v1/auth/logout",
            headers={"Authorization": "Bearer invalid_token_here"}
        )

        assert response.status_code == status.HTTP_401_UNAUTHORIZED

    async def test_logout_expired_token(self, async_client: AsyncClient, expired_token: str):
        """Test logout with expired token"""
        response = await async_client.post(
            "/api/v1/auth/logout",
            headers={"Authorization": f"Bearer {expired_token}"}
        )

        assert response.status_code == status.HTTP_401_UNAUTHORIZED


@pytest.mark.asyncio
class TestAuthProtectedEndpoint:
    """Test authentication middleware on protected endpoints"""

    async def test_protected_endpoint_with_valid_token(self, async_client: AsyncClient, auth_token: str):
        """Test accessing protected endpoint with valid token"""
        # This will be used to test any protected endpoint once we have them
        # For now, we'll test with a mock protected endpoint
        pass

    async def test_protected_endpoint_without_token(self, async_client: AsyncClient):
        """Test accessing protected endpoint without token"""
        # Will be implemented when we have actual protected endpoints
        pass