"""
Tests for the plugin system architecture and interfaces.

This module tests the plugin system's loading, initialization, and extensibility
mechanisms to ensure proper plugin isolation and security.
"""

import unittest
import importlib
import sys
import threading
from unittest.mock import patch, Mock


class TestPluginSystem(unittest.TestCase):
    """Test the plugin system architecture and interfaces."""

    def setUp(self):
        """Set up test fixtures."""
        self.plugin_module_path = "mlflow_oidc_auth.plugins"
        self.entra_plugin_path = "mlflow_oidc_auth.plugins.group_detection_microsoft_entra_id"

    def test_plugin_module_import(self):
        """Test that the plugins module can be imported successfully."""
        try:
            pass

            self.assertTrue(True, "Plugin module imported successfully")
        except ImportError as e:
            self.fail(f"Failed to import plugin module: {e}")

    def test_entra_plugin_import(self):
        """Test that the Microsoft Entra ID plugin can be imported successfully."""
        try:
            pass

            self.assertTrue(True, "Entra ID plugin imported successfully")
        except ImportError as e:
            self.fail(f"Failed to import Entra ID plugin: {e}")

    def test_plugin_function_availability(self):
        """Test that required plugin functions are available."""
        from mlflow_oidc_auth.plugins.group_detection_microsoft_entra_id import (
            get_user_groups,
        )

        # Verify function exists and is callable
        self.assertTrue(callable(get_user_groups), "get_user_groups should be callable")

        # Verify function signature
        import inspect

        sig = inspect.signature(get_user_groups)
        params = list(sig.parameters.keys())
        self.assertEqual(params, ["access_token"], "Function should accept access_token parameter")

    def test_plugin_isolation(self):
        """Test that plugins are properly isolated and don't interfere with each other."""
        # Import the plugin module
        from mlflow_oidc_auth.plugins import group_detection_microsoft_entra_id

        # Verify the plugin has its own namespace
        self.assertTrue(hasattr(group_detection_microsoft_entra_id, "get_user_groups"))
        self.assertTrue(hasattr(group_detection_microsoft_entra_id, "requests"))

        # Verify plugin doesn't pollute global namespace
        import mlflow_oidc_auth.plugins

        plugin_attrs = dir(mlflow_oidc_auth.plugins)

        # Should not have plugin-specific functions in the main plugins namespace
        self.assertNotIn("get_user_groups", plugin_attrs)
        self.assertNotIn("requests", plugin_attrs)

    def test_plugin_security_imports(self):
        """Test that plugins only import necessary and safe modules."""
        import mlflow_oidc_auth.plugins.group_detection_microsoft_entra_id as plugin_module

        # Verify only expected modules are imported
        module_globals = dir(plugin_module)

        # Check that requests is imported (expected)
        self.assertIn("requests", module_globals)

        # Verify no dangerous imports
        dangerous_imports = ["os", "sys", "subprocess", "eval", "exec", "__import__"]
        for dangerous in dangerous_imports:
            self.assertNotIn(
                dangerous,
                module_globals,
                f"Plugin should not import dangerous module: {dangerous}",
            )

    def test_plugin_error_handling_isolation(self):
        """Test that plugin errors don't crash the main application."""
        with patch("mlflow_oidc_auth.plugins.group_detection_microsoft_entra_id.requests.get") as mock_get:
            # Simulate a plugin that raises an exception
            mock_get.side_effect = Exception("Plugin internal error")

            from mlflow_oidc_auth.plugins.group_detection_microsoft_entra_id import (
                get_user_groups,
            )

            # The plugin should raise its own exception, not crash the system
            with self.assertRaises(Exception) as context:
                get_user_groups("test_token")

            self.assertIn("Plugin internal error", str(context.exception))

    def test_plugin_interface_compliance(self):
        """Test that plugins comply with expected interface contracts."""
        from mlflow_oidc_auth.plugins.group_detection_microsoft_entra_id import (
            get_user_groups,
        )

        # Test with mock to verify interface compliance
        with patch("mlflow_oidc_auth.plugins.group_detection_microsoft_entra_id.requests.get") as mock_get:
            mock_response = Mock()
            mock_response.ok = True
            mock_response.json.return_value = {"value": [{"displayName": "Test Group"}]}
            mock_get.return_value = mock_response

            result = get_user_groups("test_token")

            # Verify return type compliance
            self.assertIsInstance(result, list, "Plugin should return a list")
            self.assertIsInstance(result[0], str, "Plugin should return list of strings")

    def test_plugin_extensibility(self):
        """Test that the plugin system supports extensibility."""
        # Verify that new plugins could be added to the plugins directory
        import os

        plugins_dir = os.path.dirname(__import__("mlflow_oidc_auth.plugins", fromlist=[""]).__file__)

        # Verify plugins directory exists and is accessible
        self.assertTrue(os.path.exists(plugins_dir), "Plugins directory should exist")
        self.assertTrue(os.path.isdir(plugins_dir), "Plugins path should be a directory")

        # Verify existing plugin structure
        entra_plugin_dir = os.path.join(plugins_dir, "group_detection_microsoft_entra_id")
        self.assertTrue(os.path.exists(entra_plugin_dir), "Entra ID plugin directory should exist")
        self.assertTrue(os.path.isdir(entra_plugin_dir), "Entra ID plugin should be a directory")

    def test_plugin_module_reloading(self):
        """Test that plugins can be reloaded without system restart."""
        # Import the plugin
        import mlflow_oidc_auth.plugins.group_detection_microsoft_entra_id as plugin

        # Get original function reference
        plugin.get_user_groups

        # Reload the module
        importlib.reload(plugin)

        # Verify function is still available after reload
        self.assertTrue(hasattr(plugin, "get_user_groups"))
        self.assertTrue(callable(plugin.get_user_groups))

        # Function reference should be updated after reload
        reloaded_function = plugin.get_user_groups
        self.assertIsNotNone(reloaded_function)

    def test_plugin_dependency_management(self):
        """Test that plugin dependencies are properly managed."""
        # Verify that the plugin's requests dependency is available
        from mlflow_oidc_auth.plugins.group_detection_microsoft_entra_id import requests

        # Verify requests module has expected attributes
        self.assertTrue(hasattr(requests, "get"), "requests module should have get method")
        self.assertTrue(hasattr(requests, "ConnectionError"), "requests should have ConnectionError")
        self.assertTrue(hasattr(requests, "Timeout"), "requests should have Timeout")

    def test_plugin_configuration_isolation(self):
        """Test that plugin configurations don't interfere with each other."""
        # This test ensures that if multiple plugins were present,
        # their configurations would be isolated

        # Import plugin and verify it doesn't modify global state
        original_modules = set(sys.modules.keys())

        # Verify no unexpected modules were added to global state
        new_modules = set(sys.modules.keys()) - original_modules

        # Only expected modules should be added

        # Allow for requests and its dependencies if not already loaded
        allowed_patterns = [
            "mlflow_oidc_auth.plugins",
            "requests",
            "urllib3",
            "certifi",
            "charset_normalizer",
            "idna",
        ]

        unexpected_modules = []
        for module in new_modules:
            if not any(pattern in module for pattern in allowed_patterns):
                unexpected_modules.append(module)

        self.assertEqual(unexpected_modules, [], f"Unexpected modules loaded: {unexpected_modules}")


class TestPluginSecurityAndIsolation(unittest.TestCase):
    """Test plugin security and isolation mechanisms."""

    def test_plugin_cannot_access_sensitive_data(self):
        """Test that plugins cannot access sensitive application data."""
        # This is a conceptual test - in a real implementation,
        # you would verify that plugins run in a restricted context

        from mlflow_oidc_auth.plugins.group_detection_microsoft_entra_id import (
            get_user_groups,
        )

        # Verify plugin function doesn't have access to sensitive globals

        # Get the plugin function's globals
        func_globals = get_user_groups.__globals__

        # Verify no sensitive data is accessible
        sensitive_keys = ["password", "secret", "key", "token", "credential"]
        for key in func_globals.keys():
            for sensitive in sensitive_keys:
                if sensitive in key.lower() and key != "access_token":
                    self.fail(f"Plugin has access to potentially sensitive global: {key}")

    def test_plugin_resource_constraints(self):
        """Test that plugins operate within reasonable resource constraints."""
        # This test verifies that plugins don't consume excessive resources

        import time
        from mlflow_oidc_auth.plugins.group_detection_microsoft_entra_id import (
            get_user_groups,
        )

        with patch("mlflow_oidc_auth.plugins.group_detection_microsoft_entra_id.requests.get") as mock_get:
            mock_response = Mock()
            mock_response.ok = True
            mock_response.json.return_value = {"value": []}
            mock_get.return_value = mock_response

            # Test that plugin execution completes in reasonable time
            start_time = time.time()
            result = get_user_groups("test_token")
            execution_time = time.time() - start_time

            # Plugin should complete quickly (under 1 second for mocked response)
            self.assertLess(execution_time, 1.0, "Plugin execution should be fast")
            self.assertIsInstance(result, list, "Plugin should return expected type")

    def test_plugin_thread_safety(self):
        """Test that plugins are thread-safe."""
        from mlflow_oidc_auth.plugins.group_detection_microsoft_entra_id import (
            get_user_groups,
        )

        results = []
        errors = []

        def worker(token_suffix):
            try:
                with patch("mlflow_oidc_auth.plugins.group_detection_microsoft_entra_id.requests.get") as mock_get:
                    mock_response = Mock()
                    mock_response.ok = True
                    mock_response.json.return_value = {"value": [{"displayName": f"Group_{token_suffix}"}]}
                    mock_get.return_value = mock_response

                    result = get_user_groups(f"token_{token_suffix}")
                    results.append(result)
            except Exception as e:
                errors.append(e)

        # Run multiple threads concurrently
        threads = []
        for i in range(5):
            thread = threading.Thread(target=worker, args=(i,))
            threads.append(thread)
            thread.start()

        # Wait for all threads to complete
        for thread in threads:
            thread.join()

        # Verify no errors occurred
        self.assertEqual(errors, [], f"Thread safety errors: {errors}")
        self.assertEqual(len(results), 5, "All threads should complete successfully")
