"""
Integration tests for hardware integration and router communication.

Tests WiFi router communication, CSI data collection, and hardware management.
"""

import pytest
import asyncio
import numpy as np
from datetime import datetime, timedelta
from typing import Dict, Any, List, Optional
from unittest.mock import AsyncMock, MagicMock, patch
import json
import socket


class MockRouterInterface:
    """Mock WiFi router interface for testing."""
    
    def __init__(self, router_id: str, ip_address: str = "192.168.1.1"):
        self.router_id = router_id
        self.ip_address = ip_address
        self.is_connected = False
        self.is_authenticated = False
        self.csi_streaming = False
        self.connection_attempts = 0
        self.last_heartbeat = None
        self.firmware_version = "1.2.3"
        self.capabilities = ["csi", "beamforming", "mimo"]
    
    async def connect(self) -> bool:
        """Connect to the router."""
        self.connection_attempts += 1
        
        # Simulate connection failure for testing
        if self.connection_attempts == 1:
            return False
        
        await asyncio.sleep(0.1)  # Simulate connection time
        self.is_connected = True
        return True
    
    async def authenticate(self, username: str, password: str) -> bool:
        """Authenticate with the router."""
        if not self.is_connected:
            return False
        
        # Simulate authentication
        if username == "admin" and password == "correct_password":
            self.is_authenticated = True
            return True
        
        return False
    
    async def start_csi_streaming(self, config: Dict[str, Any]) -> bool:
        """Start CSI data streaming."""
        if not self.is_authenticated:
            return False
        
        # This should fail initially to test proper error handling
        return False
    
    async def stop_csi_streaming(self) -> bool:
        """Stop CSI data streaming."""
        if self.csi_streaming:
            self.csi_streaming = False
            return True
        return False
    
    async def get_status(self) -> Dict[str, Any]:
        """Get router status."""
        return {
            "router_id": self.router_id,
            "ip_address": self.ip_address,
            "is_connected": self.is_connected,
            "is_authenticated": self.is_authenticated,
            "csi_streaming": self.csi_streaming,
            "firmware_version": self.firmware_version,
            "uptime_seconds": 3600,
            "signal_strength": -45.2,
            "temperature": 42.5,
            "cpu_usage": 15.3
        }
    
    async def send_heartbeat(self) -> bool:
        """Send heartbeat to router."""
        if not self.is_connected:
            return False
        
        self.last_heartbeat = datetime.utcnow()
        return True


class TestRouterConnection:
    """Test router connection functionality."""
    
    @pytest.fixture
    def router_interface(self):
        """Create router interface for testing."""
        return MockRouterInterface("router_001", "192.168.1.100")
    
    @pytest.mark.asyncio
    async def test_router_connection_should_fail_initially(self, router_interface):
        """Test router connection - should fail initially."""
        # First connection attempt should fail
        result = await router_interface.connect()
        
        # This will fail initially because we designed the mock to fail first attempt
        assert result is False
        assert router_interface.is_connected is False
        assert router_interface.connection_attempts == 1
        
        # Second attempt should succeed
        result = await router_interface.connect()
        assert result is True
        assert router_interface.is_connected is True
    
    @pytest.mark.asyncio
    async def test_router_authentication_should_fail_initially(self, router_interface):
        """Test router authentication - should fail initially."""
        # Connect first
        await router_interface.connect()
        await router_interface.connect()  # Second attempt succeeds
        
        # Test wrong credentials
        result = await router_interface.authenticate("admin", "wrong_password")
        
        # This will fail initially
        assert result is False
        assert router_interface.is_authenticated is False
        
        # Test correct credentials
        result = await router_interface.authenticate("admin", "correct_password")
        assert result is True
        assert router_interface.is_authenticated is True
    
    @pytest.mark.asyncio
    async def test_csi_streaming_start_should_fail_initially(self, router_interface):
        """Test CSI streaming start - should fail initially."""
        # Setup connection and authentication
        await router_interface.connect()
        await router_interface.connect()  # Second attempt succeeds
        await router_interface.authenticate("admin", "correct_password")
        
        # Try to start CSI streaming
        config = {
            "frequency": 5.8e9,
            "bandwidth": 80e6,
            "sample_rate": 1000,
            "antenna_config": "4x4_mimo"
        }
        
        result = await router_interface.start_csi_streaming(config)
        
        # This will fail initially because the mock is designed to return False
        assert result is False
        assert router_interface.csi_streaming is False
    
    @pytest.mark.asyncio
    async def test_router_status_retrieval_should_fail_initially(self, router_interface):
        """Test router status retrieval - should fail initially."""
        status = await router_interface.get_status()
        
        # This will fail initially
        assert isinstance(status, dict)
        assert status["router_id"] == "router_001"
        assert status["ip_address"] == "192.168.1.100"
        assert "firmware_version" in status
        assert "uptime_seconds" in status
        assert "signal_strength" in status
        assert "temperature" in status
        assert "cpu_usage" in status
    
    @pytest.mark.asyncio
    async def test_heartbeat_mechanism_should_fail_initially(self, router_interface):
        """Test heartbeat mechanism - should fail initially."""
        # Heartbeat without connection should fail
        result = await router_interface.send_heartbeat()
        
        # This will fail initially
        assert result is False
        assert router_interface.last_heartbeat is None
        
        # Connect and try heartbeat
        await router_interface.connect()
        await router_interface.connect()  # Second attempt succeeds
        
        result = await router_interface.send_heartbeat()
        assert result is True
        assert router_interface.last_heartbeat is not None


class TestMultiRouterManagement:
    """Test management of multiple routers."""
    
    @pytest.fixture
    def router_manager(self):
        """Create router manager for testing."""
        class RouterManager:
            def __init__(self):
                self.routers = {}
                self.active_connections = 0
            
            async def add_router(self, router_id: str, ip_address: str) -> bool:
                """Add a router to management."""
                if router_id in self.routers:
                    return False
                
                router = MockRouterInterface(router_id, ip_address)
                self.routers[router_id] = router
                return True
            
            async def connect_router(self, router_id: str) -> bool:
                """Connect to a specific router."""
                if router_id not in self.routers:
                    return False
                
                router = self.routers[router_id]
                
                # Try connecting twice (mock fails first time)
                success = await router.connect()
                if not success:
                    success = await router.connect()
                
                if success:
                    self.active_connections += 1
                
                return success
            
            async def authenticate_router(self, router_id: str, username: str, password: str) -> bool:
                """Authenticate with a router."""
                if router_id not in self.routers:
                    return False
                
                router = self.routers[router_id]
                return await router.authenticate(username, password)
            
            async def get_all_status(self) -> Dict[str, Dict[str, Any]]:
                """Get status of all routers."""
                status = {}
                for router_id, router in self.routers.items():
                    status[router_id] = await router.get_status()
                return status
            
            async def start_all_csi_streaming(self, config: Dict[str, Any]) -> Dict[str, bool]:
                """Start CSI streaming on all authenticated routers."""
                results = {}
                for router_id, router in self.routers.items():
                    if router.is_authenticated:
                        results[router_id] = await router.start_csi_streaming(config)
                    else:
                        results[router_id] = False
                return results
        
        return RouterManager()
    
    @pytest.mark.asyncio
    async def test_multiple_router_addition_should_fail_initially(self, router_manager):
        """Test adding multiple routers - should fail initially."""
        # Add first router
        result1 = await router_manager.add_router("router_001", "192.168.1.100")
        
        # This will fail initially
        assert result1 is True
        assert "router_001" in router_manager.routers
        
        # Add second router
        result2 = await router_manager.add_router("router_002", "192.168.1.101")
        assert result2 is True
        assert "router_002" in router_manager.routers
        
        # Try to add duplicate router
        result3 = await router_manager.add_router("router_001", "192.168.1.102")
        assert result3 is False
        assert len(router_manager.routers) == 2
    
    @pytest.mark.asyncio
    async def test_concurrent_router_connections_should_fail_initially(self, router_manager):
        """Test concurrent router connections - should fail initially."""
        # Add multiple routers
        await router_manager.add_router("router_001", "192.168.1.100")
        await router_manager.add_router("router_002", "192.168.1.101")
        await router_manager.add_router("router_003", "192.168.1.102")
        
        # Connect to all routers concurrently
        connection_tasks = [
            router_manager.connect_router("router_001"),
            router_manager.connect_router("router_002"),
            router_manager.connect_router("router_003")
        ]
        
        results = await asyncio.gather(*connection_tasks)
        
        # This will fail initially
        assert len(results) == 3
        assert all(results)  # All connections should succeed
        assert router_manager.active_connections == 3
    
    @pytest.mark.asyncio
    async def test_router_status_aggregation_should_fail_initially(self, router_manager):
        """Test router status aggregation - should fail initially."""
        # Add and connect routers
        await router_manager.add_router("router_001", "192.168.1.100")
        await router_manager.add_router("router_002", "192.168.1.101")
        
        await router_manager.connect_router("router_001")
        await router_manager.connect_router("router_002")
        
        # Get all status
        all_status = await router_manager.get_all_status()
        
        # This will fail initially
        assert isinstance(all_status, dict)
        assert len(all_status) == 2
        assert "router_001" in all_status
        assert "router_002" in all_status
        
        # Verify status structure
        for router_id, status in all_status.items():
            assert "router_id" in status
            assert "ip_address" in status
            assert "is_connected" in status
            assert status["is_connected"] is True


class TestCSIDataCollection:
    """Test CSI data collection from routers."""
    
    @pytest.fixture
    def csi_collector(self):
        """Create CSI data collector."""
        class CSICollector:
            def __init__(self):
                self.collected_data = []
                self.is_collecting = False
                self.collection_rate = 0
            
            async def start_collection(self, router_interfaces: List[MockRouterInterface]) -> bool:
                """Start CSI data collection."""
                # This should fail initially
                return False
            
            async def stop_collection(self) -> bool:
                """Stop CSI data collection."""
                if self.is_collecting:
                    self.is_collecting = False
                    return True
                return False
            
            async def collect_frame(self, router_interface: MockRouterInterface) -> Optional[Dict[str, Any]]:
                """Collect a single CSI frame."""
                if not router_interface.csi_streaming:
                    return None
                
                # Simulate CSI data
                return {
                    "timestamp": datetime.utcnow().isoformat(),
                    "router_id": router_interface.router_id,
                    "amplitude": np.random.rand(64, 32).tolist(),
                    "phase": np.random.rand(64, 32).tolist(),
                    "frequency": 5.8e9,
                    "bandwidth": 80e6,
                    "antenna_count": 4,
                    "subcarrier_count": 64,
                    "signal_quality": np.random.uniform(0.7, 0.95)
                }
            
            def get_collection_stats(self) -> Dict[str, Any]:
                """Get collection statistics."""
                return {
                    "total_frames": len(self.collected_data),
                    "collection_rate": self.collection_rate,
                    "is_collecting": self.is_collecting,
                    "last_collection": self.collected_data[-1]["timestamp"] if self.collected_data else None
                }
        
        return CSICollector()
    
    @pytest.mark.asyncio
    async def test_csi_collection_start_should_fail_initially(self, csi_collector):
        """Test CSI collection start - should fail initially."""
        router_interfaces = [
            MockRouterInterface("router_001", "192.168.1.100"),
            MockRouterInterface("router_002", "192.168.1.101")
        ]
        
        result = await csi_collector.start_collection(router_interfaces)
        
        # This will fail initially because the collector is designed to return False
        assert result is False
        assert csi_collector.is_collecting is False
    
    @pytest.mark.asyncio
    async def test_single_frame_collection_should_fail_initially(self, csi_collector):
        """Test single frame collection - should fail initially."""
        router = MockRouterInterface("router_001", "192.168.1.100")
        
        # Without CSI streaming enabled
        frame = await csi_collector.collect_frame(router)
        
        # This will fail initially
        assert frame is None
        
        # Enable CSI streaming (manually for testing)
        router.csi_streaming = True
        frame = await csi_collector.collect_frame(router)
        
        assert frame is not None
        assert "timestamp" in frame
        assert "router_id" in frame
        assert "amplitude" in frame
        assert "phase" in frame
        assert frame["router_id"] == "router_001"
    
    @pytest.mark.asyncio
    async def test_collection_statistics_should_fail_initially(self, csi_collector):
        """Test collection statistics - should fail initially."""
        stats = csi_collector.get_collection_stats()
        
        # This will fail initially
        assert isinstance(stats, dict)
        assert "total_frames" in stats
        assert "collection_rate" in stats
        assert "is_collecting" in stats
        assert "last_collection" in stats
        
        assert stats["total_frames"] == 0
        assert stats["is_collecting"] is False
        assert stats["last_collection"] is None


class TestHardwareErrorHandling:
    """Test hardware error handling scenarios."""
    
    @pytest.fixture
    def unreliable_router(self):
        """Create unreliable router for error testing."""
        class UnreliableRouter(MockRouterInterface):
            def __init__(self, router_id: str, ip_address: str = "192.168.1.1"):
                super().__init__(router_id, ip_address)
                self.failure_rate = 0.3  # 30% failure rate
                self.connection_drops = 0
            
            async def connect(self) -> bool:
                """Unreliable connection."""
                if np.random.random() < self.failure_rate:
                    return False
                return await super().connect()
            
            async def send_heartbeat(self) -> bool:
                """Unreliable heartbeat."""
                if np.random.random() < self.failure_rate:
                    self.is_connected = False
                    self.connection_drops += 1
                    return False
                return await super().send_heartbeat()
            
            async def start_csi_streaming(self, config: Dict[str, Any]) -> bool:
                """Unreliable CSI streaming."""
                if np.random.random() < self.failure_rate:
                    return False
                
                # Still return False for initial test failure
                return False
        
        return UnreliableRouter("unreliable_router", "192.168.1.200")
    
    @pytest.mark.asyncio
    async def test_connection_retry_mechanism_should_fail_initially(self, unreliable_router):
        """Test connection retry mechanism - should fail initially."""
        max_retries = 5
        success = False
        
        for attempt in range(max_retries):
            result = await unreliable_router.connect()
            if result:
                success = True
                break
            
            # Wait before retry
            await asyncio.sleep(0.1)
        
        # This will fail initially due to randomness, but should eventually pass
        # The test demonstrates the need for retry logic
        assert success or unreliable_router.connection_attempts >= max_retries
    
    @pytest.mark.asyncio
    async def test_connection_drop_detection_should_fail_initially(self, unreliable_router):
        """Test connection drop detection - should fail initially."""
        # Establish connection
        await unreliable_router.connect()
        await unreliable_router.connect()  # Ensure connection
        
        initial_drops = unreliable_router.connection_drops
        
        # Send multiple heartbeats to trigger potential drops
        for _ in range(10):
            await unreliable_router.send_heartbeat()
            await asyncio.sleep(0.01)
        
        # This will fail initially
        # Should detect connection drops
        final_drops = unreliable_router.connection_drops
        assert final_drops >= initial_drops  # May have detected drops
    
    @pytest.mark.asyncio
    async def test_hardware_timeout_handling_should_fail_initially(self):
        """Test hardware timeout handling - should fail initially."""
        async def slow_operation():
            """Simulate slow hardware operation."""
            await asyncio.sleep(2.0)  # 2 second delay
            return "success"
        
        # Test with timeout
        try:
            result = await asyncio.wait_for(slow_operation(), timeout=1.0)
            # This should not be reached
            assert False, "Operation should have timed out"
        except asyncio.TimeoutError:
            # This will fail initially because we expect timeout handling
            assert True  # Timeout was properly handled
    
    @pytest.mark.asyncio
    async def test_network_error_simulation_should_fail_initially(self):
        """Test network error simulation - should fail initially."""
        class NetworkErrorRouter(MockRouterInterface):
            async def connect(self) -> bool:
                """Simulate network error."""
                raise ConnectionError("Network unreachable")
        
        router = NetworkErrorRouter("error_router", "192.168.1.999")
        
        # This will fail initially
        with pytest.raises(ConnectionError, match="Network unreachable"):
            await router.connect()


class TestHardwareConfiguration:
    """Test hardware configuration management."""
    
    @pytest.fixture
    def config_manager(self):
        """Create configuration manager."""
        class ConfigManager:
            def __init__(self):
                self.default_config = {
                    "frequency": 5.8e9,
                    "bandwidth": 80e6,
                    "sample_rate": 1000,
                    "antenna_config": "4x4_mimo",
                    "power_level": 20,
                    "channel": 36
                }
                self.router_configs = {}
            
            def get_router_config(self, router_id: str) -> Dict[str, Any]:
                """Get configuration for a specific router."""
                return self.router_configs.get(router_id, self.default_config.copy())
            
            def set_router_config(self, router_id: str, config: Dict[str, Any]) -> bool:
                """Set configuration for a specific router."""
                # Validate configuration
                required_fields = ["frequency", "bandwidth", "sample_rate"]
                if not all(field in config for field in required_fields):
                    return False
                
                self.router_configs[router_id] = config
                return True
            
            def validate_config(self, config: Dict[str, Any]) -> Dict[str, Any]:
                """Validate router configuration."""
                errors = []
                
                # Frequency validation
                if "frequency" in config:
                    freq = config["frequency"]
                    if not (2.4e9 <= freq <= 6e9):
                        errors.append("Frequency must be between 2.4GHz and 6GHz")
                
                # Bandwidth validation
                if "bandwidth" in config:
                    bw = config["bandwidth"]
                    if bw not in [20e6, 40e6, 80e6, 160e6]:
                        errors.append("Bandwidth must be 20, 40, 80, or 160 MHz")
                
                # Sample rate validation
                if "sample_rate" in config:
                    sr = config["sample_rate"]
                    if not (100 <= sr <= 10000):
                        errors.append("Sample rate must be between 100 and 10000 Hz")
                
                return {
                    "valid": len(errors) == 0,
                    "errors": errors
                }
        
        return ConfigManager()
    
    def test_default_configuration_should_fail_initially(self, config_manager):
        """Test default configuration retrieval - should fail initially."""
        config = config_manager.get_router_config("new_router")
        
        # This will fail initially
        assert isinstance(config, dict)
        assert "frequency" in config
        assert "bandwidth" in config
        assert "sample_rate" in config
        assert "antenna_config" in config
        assert config["frequency"] == 5.8e9
        assert config["bandwidth"] == 80e6
    
    def test_configuration_validation_should_fail_initially(self, config_manager):
        """Test configuration validation - should fail initially."""
        # Valid configuration
        valid_config = {
            "frequency": 5.8e9,
            "bandwidth": 80e6,
            "sample_rate": 1000
        }
        
        result = config_manager.validate_config(valid_config)
        
        # This will fail initially
        assert result["valid"] is True
        assert len(result["errors"]) == 0
        
        # Invalid configuration
        invalid_config = {
            "frequency": 10e9,  # Too high
            "bandwidth": 100e6,  # Invalid
            "sample_rate": 50    # Too low
        }
        
        result = config_manager.validate_config(invalid_config)
        assert result["valid"] is False
        assert len(result["errors"]) == 3
    
    def test_router_specific_configuration_should_fail_initially(self, config_manager):
        """Test router-specific configuration - should fail initially."""
        router_id = "router_001"
        custom_config = {
            "frequency": 2.4e9,
            "bandwidth": 40e6,
            "sample_rate": 500,
            "antenna_config": "2x2_mimo"
        }
        
        # Set custom configuration
        result = config_manager.set_router_config(router_id, custom_config)
        
        # This will fail initially
        assert result is True
        
        # Retrieve custom configuration
        retrieved_config = config_manager.get_router_config(router_id)
        assert retrieved_config["frequency"] == 2.4e9
        assert retrieved_config["bandwidth"] == 40e6
        assert retrieved_config["antenna_config"] == "2x2_mimo"
        
        # Test invalid configuration
        invalid_config = {"frequency": 5.8e9}  # Missing required fields
        result = config_manager.set_router_config(router_id, invalid_config)
        assert result is False