"""
Router interface for WiFi CSI data collection
"""

import logging
import asyncio
import time
from typing import Dict, List, Optional, Any
from datetime import datetime

import numpy as np

logger = logging.getLogger(__name__)


class RouterInterface:
    """Interface for connecting to WiFi routers and collecting CSI data."""
    
    def __init__(
        self,
        router_id: str,
        host: str,
        port: int = 22,
        username: str = "admin",
        password: str = "",
        interface: str = "wlan0",
        mock_mode: bool = False
    ):
        """Initialize router interface.
        
        Args:
            router_id: Unique identifier for the router
            host: Router IP address or hostname
            port: SSH port for connection
            username: SSH username
            password: SSH password
            interface: WiFi interface name
            mock_mode: Whether to use mock data instead of real connection
        """
        self.router_id = router_id
        self.host = host
        self.port = port
        self.username = username
        self.password = password
        self.interface = interface
        self.mock_mode = mock_mode
        
        self.logger = logging.getLogger(f"{__name__}.{router_id}")
        
        # Connection state
        self.is_connected = False
        self.connection = None
        self.last_error = None
        
        # Data collection state
        self.last_data_time = None
        self.error_count = 0
        self.sample_count = 0
        
        # Mock data generation
        self.mock_data_generator = None
        if mock_mode:
            self._initialize_mock_generator()
    
    def _initialize_mock_generator(self):
        """Initialize mock data generator."""
        self.mock_data_generator = {
            'phase': 0,
            'amplitude_base': 1.0,
            'frequency': 0.1,
            'noise_level': 0.1
        }
    
    async def connect(self):
        """Connect to the router."""
        if self.mock_mode:
            self.is_connected = True
            self.logger.info(f"Mock connection established to router {self.router_id}")
            return
        
        try:
            self.logger.info(f"Connecting to router {self.router_id} at {self.host}:{self.port}")
            
            # In a real implementation, this would establish SSH connection
            # For now, we'll simulate the connection
            await asyncio.sleep(0.1)  # Simulate connection delay
            
            self.is_connected = True
            self.error_count = 0
            self.logger.info(f"Connected to router {self.router_id}")
            
        except Exception as e:
            self.last_error = str(e)
            self.error_count += 1
            self.logger.error(f"Failed to connect to router {self.router_id}: {e}")
            raise
    
    async def disconnect(self):
        """Disconnect from the router."""
        try:
            if self.connection:
                # Close SSH connection
                self.connection = None
            
            self.is_connected = False
            self.logger.info(f"Disconnected from router {self.router_id}")
            
        except Exception as e:
            self.logger.error(f"Error disconnecting from router {self.router_id}: {e}")
    
    async def reconnect(self):
        """Reconnect to the router."""
        await self.disconnect()
        await asyncio.sleep(1)  # Wait before reconnecting
        await self.connect()
    
    async def get_csi_data(self) -> Optional[np.ndarray]:
        """Get CSI data from the router.
        
        Returns:
            CSI data as numpy array, or None if no data available
        """
        if not self.is_connected:
            raise RuntimeError(f"Router {self.router_id} is not connected")
        
        try:
            if self.mock_mode:
                csi_data = self._generate_mock_csi_data()
            else:
                csi_data = await self._collect_real_csi_data()
            
            if csi_data is not None:
                self.last_data_time = datetime.now()
                self.sample_count += 1
                self.error_count = 0
            
            return csi_data
            
        except Exception as e:
            self.last_error = str(e)
            self.error_count += 1
            self.logger.error(f"Error getting CSI data from router {self.router_id}: {e}")
            return None
    
    def _generate_mock_csi_data(self) -> np.ndarray:
        """Generate mock CSI data for testing."""
        # Simulate CSI data with realistic characteristics
        num_subcarriers = 64
        num_antennas = 4
        num_samples = 100
        
        # Update mock generator state
        self.mock_data_generator['phase'] += self.mock_data_generator['frequency']
        
        # Generate amplitude and phase data
        time_axis = np.linspace(0, 1, num_samples)
        
        # Create realistic CSI patterns
        csi_data = np.zeros((num_antennas, num_subcarriers, num_samples), dtype=complex)
        
        for antenna in range(num_antennas):
            for subcarrier in range(num_subcarriers):
                # Base signal with some variation per antenna/subcarrier
                amplitude = (
                    self.mock_data_generator['amplitude_base'] * 
                    (1 + 0.2 * np.sin(2 * np.pi * subcarrier / num_subcarriers)) *
                    (1 + 0.1 * antenna)
                )
                
                # Phase with spatial and frequency variation
                phase_offset = (
                    self.mock_data_generator['phase'] +
                    2 * np.pi * subcarrier / num_subcarriers +
                    np.pi * antenna / num_antennas
                )
                
                # Add some movement simulation
                movement_freq = 0.5  # Hz
                movement_amplitude = 0.3
                movement = movement_amplitude * np.sin(2 * np.pi * movement_freq * time_axis)
                
                # Generate complex signal
                signal_amplitude = amplitude * (1 + movement)
                signal_phase = phase_offset + movement * 0.5
                
                # Add noise
                noise_real = np.random.normal(0, self.mock_data_generator['noise_level'], num_samples)
                noise_imag = np.random.normal(0, self.mock_data_generator['noise_level'], num_samples)
                noise = noise_real + 1j * noise_imag
                
                # Create complex signal
                signal = signal_amplitude * np.exp(1j * signal_phase) + noise
                csi_data[antenna, subcarrier, :] = signal
        
        return csi_data
    
    async def _collect_real_csi_data(self) -> Optional[np.ndarray]:
        """Collect real CSI data from router (placeholder implementation)."""
        # This would implement the actual CSI data collection
        # For now, return None to indicate no real implementation
        self.logger.warning("Real CSI data collection not implemented")
        return None
    
    async def check_health(self) -> bool:
        """Check if the router connection is healthy.
        
        Returns:
            True if healthy, False otherwise
        """
        if not self.is_connected:
            return False
        
        try:
            # In mock mode, always healthy
            if self.mock_mode:
                return True
            
            # For real connections, we could ping the router or check SSH connection
            # For now, consider healthy if error count is low
            return self.error_count < 5
            
        except Exception as e:
            self.logger.error(f"Error checking health of router {self.router_id}: {e}")
            return False
    
    async def get_status(self) -> Dict[str, Any]:
        """Get router status information.
        
        Returns:
            Dictionary containing router status
        """
        return {
            "router_id": self.router_id,
            "connected": self.is_connected,
            "mock_mode": self.mock_mode,
            "last_data_time": self.last_data_time.isoformat() if self.last_data_time else None,
            "error_count": self.error_count,
            "sample_count": self.sample_count,
            "last_error": self.last_error,
            "configuration": {
                "host": self.host,
                "port": self.port,
                "username": self.username,
                "interface": self.interface
            }
        }
    
    async def get_router_info(self) -> Dict[str, Any]:
        """Get router hardware information.
        
        Returns:
            Dictionary containing router information
        """
        if self.mock_mode:
            return {
                "model": "Mock Router",
                "firmware": "1.0.0-mock",
                "wifi_standard": "802.11ac",
                "antennas": 4,
                "supported_bands": ["2.4GHz", "5GHz"],
                "csi_capabilities": {
                    "max_subcarriers": 64,
                    "max_antennas": 4,
                    "sampling_rate": 1000
                }
            }
        
        # For real routers, this would query the actual hardware
        return {
            "model": "Unknown",
            "firmware": "Unknown",
            "wifi_standard": "Unknown",
            "antennas": 1,
            "supported_bands": ["Unknown"],
            "csi_capabilities": {
                "max_subcarriers": 64,
                "max_antennas": 1,
                "sampling_rate": 100
            }
        }
    
    async def configure_csi_collection(self, config: Dict[str, Any]) -> bool:
        """Configure CSI data collection parameters.
        
        Args:
            config: Configuration dictionary
            
        Returns:
            True if configuration successful, False otherwise
        """
        try:
            if self.mock_mode:
                # Update mock generator parameters
                if 'sampling_rate' in config:
                    self.mock_data_generator['frequency'] = config['sampling_rate'] / 1000.0
                
                if 'noise_level' in config:
                    self.mock_data_generator['noise_level'] = config['noise_level']
                
                self.logger.info(f"Mock CSI collection configured for router {self.router_id}")
                return True
            
            # For real routers, this would send configuration commands
            self.logger.warning("Real CSI configuration not implemented")
            return False
            
        except Exception as e:
            self.logger.error(f"Error configuring CSI collection for router {self.router_id}: {e}")
            return False
    
    def get_metrics(self) -> Dict[str, Any]:
        """Get router interface metrics.
        
        Returns:
            Dictionary containing metrics
        """
        uptime = 0
        if self.last_data_time:
            uptime = (datetime.now() - self.last_data_time).total_seconds()
        
        success_rate = 0
        if self.sample_count > 0:
            success_rate = (self.sample_count - self.error_count) / self.sample_count
        
        return {
            "router_id": self.router_id,
            "sample_count": self.sample_count,
            "error_count": self.error_count,
            "success_rate": success_rate,
            "uptime_seconds": uptime,
            "is_connected": self.is_connected,
            "mock_mode": self.mock_mode
        }
    
    def reset_stats(self):
        """Reset statistics counters."""
        self.error_count = 0
        self.sample_count = 0
        self.last_error = None
        self.logger.info(f"Statistics reset for router {self.router_id}")