"""
Test suite for Outline VPN implementation
"""

import os
import sys
import asyncio
import unittest
import tempfile
from unittest.mock import Mock, patch
from pathlib import Path

# Add project root to path
project_root = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))
sys.path.insert(0, project_root)

from core.outline_config import OutlineManager, UserConfig
from core.outline_server import OutlineServer
from core.shadowsocks_protocol import ShadowsocksProtocol
from core.ipsec_manager import IPsecManager
from core.nat_engine import NATEngine
from core.traffic_router import TrafficRouter

class TestOutlineVPN(unittest.TestCase):
    def setUp(self):
        self.temp_dir = tempfile.mkdtemp()
        self.config_path = os.path.join(self.temp_dir, 'test_config.json')
        self.manager = OutlineManager(self.config_path)
        
    def tearDown(self):
        import shutil
        shutil.rmtree(self.temp_dir)

    def test_user_management(self):
        """Test user creation and key management"""
        # Add user
        user = self.manager.add_user('testuser')
        self.assertIsNotNone(user.access_key)
        self.assertEqual(user.user_id, 'testuser')
        self.assertIsNone(user.data_limit)
        
        # Test user retrieval
        found_user = self.manager.get_user_by_key(user.access_key)
        self.assertEqual(found_user.user_id, 'testuser')
        
        # Test user removal
        self.assertTrue(self.manager.remove_user('testuser'))
        self.assertIsNone(self.manager.get_user_by_key(user.access_key))

    def test_bandwidth_tracking(self):
        """Test bandwidth usage tracking"""
        user = self.manager.add_user('bandwidthuser', data_limit=1000)
        self.manager.update_user_bandwidth('bandwidthuser', 500)
        self.assertEqual(user.bandwidth_usage, 500)
        self.assertTrue(user.is_active)
        
        # Test data limit enforcement
        self.manager.update_user_bandwidth('bandwidthuser', 600)
        self.assertFalse(user.is_active)

class TestShadowsocksProtocol(unittest.TestCase):
    def setUp(self):
        self.protocol = ShadowsocksProtocol("test_key")

    def test_encryption(self):
        """Test packet encryption and decryption"""
        test_data = b"Hello, World!"
        encrypted = self.protocol._encrypt_packet(test_data)
        decrypted = self.protocol._decrypt_packet(encrypted)
        self.assertEqual(test_data, decrypted)

class TestOutlineServer(unittest.IsolatedAsyncioTestCase):
    async def asyncSetUp(self):
        config = {
            "server": {
                "host": "127.0.0.1",
                "port": 8388,
                "virtual_network": "10.0.0.0/24"
            }
        }
        self.server = OutlineServer(config)

    async def test_server_start_stop(self):
        """Test server startup and shutdown"""
        # Mock the actual server binding
        with patch('asyncio.start_server'):
            startup_task = asyncio.create_task(self.server.start())
            await asyncio.sleep(0.1)  # Give time for server to "start"
            self.assertTrue(self.server.is_running)
            
            await self.server.stop()
            self.assertFalse(self.server.is_running)
            await startup_task

    async def test_client_handling(self):
        """Test client connection handling"""
        # Add a test user
        self.server.outline_manager.add_user('testuser')
        
        # Mock reader/writer
        reader = Mock()
        writer = Mock()
        writer.get_extra_info.return_value = ('127.0.0.1', 12345)
        
        # Test connection handling
        await self.server._handle_client(reader, writer)
        writer.close.assert_called_once()

class TestNATEngine(unittest.IsolatedAsyncioTestCase):
    async def asyncSetUp(self):
        self.nat = NATEngine()

    async def test_nat_session(self):
        """Test NAT session creation and tracking"""
        session = self.nat.create_session(
            virtual_ip="10.0.0.2",
            virtual_port=1234,
            real_ip="192.168.1.1",
            real_port=80
        )
        self.assertIsNotNone(session)
        self.assertEqual(session.virtual_ip, "10.0.0.2")
        
        # Test session lookup
        found = self.nat.lookup_session("192.168.1.1", 80)
        self.assertEqual(found.virtual_ip, "10.0.0.2")

class TestTrafficRouter(unittest.IsolatedAsyncioTestCase):
    async def asyncSetUp(self):
        config = {
            "vpn_host": "127.0.0.1",
            "vpn_port": 8388,
            "virtual_network": "10.0.0.0/24"
        }
        self.router = TrafficRouter(config)

    async def test_traffic_routing(self):
        """Test traffic routing functionality"""
        # Mock connection
        reader = Mock()
        writer = Mock()
        writer.get_extra_info.return_value = ('10.0.0.2', 1234)
        
        # Test connection handling
        with patch('asyncio.open_connection'):
            await self.router._handle_client_connection(reader, writer)
            writer.close.assert_called_once()

def run_tests():
    """Run all tests"""
    loader = unittest.TestLoader()
    suite = loader.loadTestsFromModule(sys.modules[__name__])
    runner = unittest.TextTestRunner(verbosity=2)
    return runner.run(suite)

if __name__ == '__main__':
    run_tests()