#!/usr/bin/env python3
"""
Base Service Manager for Personal Internet Cell
Provides standardized interface for all service managers
"""

import logging
import json
from abc import ABC, abstractmethod
from typing import Dict, List, Optional, Any
from datetime import datetime
import traceback

logger = logging.getLogger(__name__)

class BaseServiceManager(ABC):
    """Base class for all service managers with standardized interface"""
    
    def __init__(self, service_name: str, data_dir: str = '/app/data', config_dir: str = '/app/config'):
        self.service_name = service_name
        self.data_dir = data_dir
        self.config_dir = config_dir
        self.logger = logging.getLogger(f'picell.{service_name}')
        
        # Ensure directories exist
        self._ensure_directories()
    
    def _ensure_directories(self):
        """Ensure required directories exist"""
        import os
        os.makedirs(self.data_dir, exist_ok=True)
        os.makedirs(self.config_dir, exist_ok=True)
    
    @abstractmethod
    def get_status(self) -> Dict[str, Any]:
        """Get service status - must be implemented by subclasses"""
        pass
    
    @abstractmethod
    def test_connectivity(self) -> Dict[str, Any]:
        """Test service connectivity - must be implemented by subclasses"""
        pass
    
    def get_logs(self, lines: int = 50) -> List[str]:
        """Get service logs - default implementation"""
        try:
            log_file = f"{self.data_dir}/{self.service_name}.log"
            import os
            if not os.path.exists(log_file):
                return [f"No log file found for {self.service_name}"]
            
            with open(log_file, 'r', encoding='utf-8', errors='ignore') as f:
                all_lines = f.readlines()
                return all_lines[-lines:] if lines > 0 else all_lines
        except Exception as e:
            self.logger.error(f"Error reading logs: {e}")
            return [f"Error reading logs: {str(e)}"]
    
    def restart_service(self) -> bool:
        """Restart service - default implementation"""
        try:
            self.logger.info(f"Restarting {self.service_name} service")
            # Default implementation - subclasses can override
            return True
        except Exception as e:
            self.logger.error(f"Error restarting {self.service_name}: {e}")
            return False
    
    def get_config(self) -> Dict[str, Any]:
        """Get service configuration - default implementation"""
        try:
            config_file = f"{self.config_dir}/{self.service_name}.json"
            import os
            if not os.path.exists(config_file):
                return {"error": f"No configuration file found for {self.service_name}"}
            
            with open(config_file, 'r') as f:
                return json.load(f)
        except Exception as e:
            self.logger.error(f"Error reading config: {e}")
            return {"error": str(e)}
    
    def update_config(self, config: Dict[str, Any]) -> bool:
        """Update service configuration - default implementation"""
        try:
            config_file = f"{self.config_dir}/{self.service_name}.json"
            import os
            os.makedirs(os.path.dirname(config_file), exist_ok=True)
            
            with open(config_file, 'w') as f:
                json.dump(config, f, indent=2)
            
            self.logger.info(f"Updated configuration for {self.service_name}")
            return True
        except Exception as e:
            self.logger.error(f"Error updating config: {e}")
            return False
    
    def validate_config(self, config: Dict[str, Any]) -> Dict[str, Any]:
        """Validate configuration - default implementation"""
        return {
            "valid": True,
            "errors": [],
            "warnings": []
        }
    
    def get_metrics(self) -> Dict[str, Any]:
        """Get service metrics - default implementation"""
        return {
            "service": self.service_name,
            "timestamp": datetime.utcnow().isoformat(),
            "status": "unknown"
        }
    
    def handle_error(self, error: Exception, context: str = "") -> Dict[str, Any]:
        """Standardized error handling"""
        error_info = {
            "error": str(error),
            "type": type(error).__name__,
            "context": context,
            "timestamp": datetime.utcnow().isoformat(),
            "service": self.service_name,
            "traceback": traceback.format_exc()
        }
        
        self.logger.error(f"Error in {context}: {error}")
        return error_info
    
    def log_operation(self, operation: str, details: Dict[str, Any] = None):
        """Log service operations"""
        log_data = {
            "operation": operation,
            "service": self.service_name,
            "timestamp": datetime.utcnow().isoformat(),
            "details": details or {}
        }
        self.logger.info(f"Operation: {operation} - {json.dumps(details) if details else 'No details'}")
    
    def health_check(self) -> Dict[str, Any]:
        """Comprehensive health check"""
        try:
            status = self.get_status()
            connectivity = self.test_connectivity()
            metrics = self.get_metrics()
            
            return {
                "service": self.service_name,
                "timestamp": datetime.utcnow().isoformat(),
                "status": status,
                "connectivity": connectivity,
                "metrics": metrics,
                "healthy": self._is_healthy(status, connectivity)
            }
        except Exception as e:
            return self.handle_error(e, "health_check")
    
    def _is_healthy(self, status: Dict[str, Any], connectivity: Dict[str, Any]) -> bool:
        """Determine if service is healthy based on status and connectivity"""
        # Default implementation - subclasses can override
        return status.get("running", False) and connectivity.get("success", False)