"""
API Gateway for handling all backend requests with user confirmation
"""

import logging
from typing import Dict, List, Optional, Any
from dataclasses import dataclass
from datetime import datetime
import uuid

logger = logging.getLogger(__name__)


@dataclass
class ConfirmationRequest:
    """Represents a pending action awaiting user confirmation"""
    confirmation_id: str
    user_id: str
    action_type: str
    action_details: Dict[str, Any]
    created_at: datetime
    expires_at: datetime
    status: str  # pending, confirmed, denied, expired


class APIGateway:
    """
    Central gateway for all API requests from agents to backend services.
    Handles authentication, authorization, and user confirmation flows.
    """
    
    def __init__(self):
        # TODO: Initialize connection to backend services
        # TODO: Set up authentication mechanism
        # TODO: Configure rate limiting
        self.pending_confirmations: Dict[str, ConfirmationRequest] = {}
    
    def authenticate(self, user_id: str, session_token: str) -> bool:
        """
        Authenticate user request
        
        Args:
            user_id: User identifier
            session_token: Session authentication token
            
        Returns:
            bool: True if authenticated
            
        TODO: Implement actual authentication logic
        TODO: Validate session tokens
        TODO: Check user permissions
        """
        raise NotImplementedError("Authentication not implemented")
    
    def authorize(self, user_id: str, action: str, resource: str) -> bool:
        """
        Check if user is authorized to perform action on resource
        
        Args:
            user_id: User identifier
            action: Action to perform (create, read, update, delete)
            resource: Resource type (network, subscriber, policy, etc.)
            
        Returns:
            bool: True if authorized
            
        TODO: Implement RBAC (Role-Based Access Control)
        TODO: Check tenant boundaries
        TODO: Validate resource ownership
        """
        raise NotImplementedError("Authorization not implemented")
    
    def request_confirmation(self, user_id: str, action_type: str, 
                           action_details: Dict[str, Any]) -> str:
        """
        Create a confirmation request for user action
        
        Args:
            user_id: User requesting the action
            action_type: Type of action (e.g., 'network_configure', 'subscriber_create')
            action_details: Details of the action to be performed
            
        Returns:
            str: Confirmation ID for tracking
            
        TODO: Store confirmation request
        TODO: Set appropriate expiration time
        TODO: Send notification to user
        """
        raise NotImplementedError("Confirmation request not implemented")
    
    def get_confirmation_status(self, confirmation_id: str) -> Optional[ConfirmationRequest]:
        """
        Get status of a confirmation request
        
        Args:
            confirmation_id: ID of the confirmation request
            
        Returns:
            ConfirmationRequest or None if not found
            
        TODO: Retrieve from storage
        TODO: Check expiration
        """
        raise NotImplementedError("Get confirmation status not implemented")
    
    def confirm_action(self, confirmation_id: str, user_id: str, confirmed: bool) -> bool:
        """
        Confirm or deny a pending action
        
        Args:
            confirmation_id: ID of the confirmation request
            user_id: User confirming (must match requester)
            confirmed: True to confirm, False to deny
            
        Returns:
            bool: Success status
            
        TODO: Validate confirmation exists
        TODO: Verify user matches requester
        TODO: Update confirmation status
        """
        raise NotImplementedError("Confirm action not implemented")
    
    def execute_action(self, confirmation_id: str) -> Dict[str, Any]:
        """
        Execute a confirmed action
        
        Args:
            confirmation_id: ID of confirmed action
            
        Returns:
            dict: Result of the action execution
            
        TODO: Verify action is confirmed
        TODO: Route to appropriate backend service
        TODO: Handle errors and rollback if needed
        """
        raise NotImplementedError("Execute action not implemented")
    
    # Network Configuration APIs
    
    def configure_network(self, config: Dict[str, Any], user_id: str) -> str:
        """
        Configure network settings (NAT, VLAN, etc.)
        
        Args:
            config: Network configuration details
            user_id: User making the request
            
        Returns:
            str: Confirmation ID
            
        TODO: Validate network configuration
        TODO: Check for conflicts
        TODO: Create confirmation request
        """
        raise NotImplementedError("Network configuration not implemented")
    
    def bulk_configure_networks(self, configs: List[Dict[str, Any]], user_id: str) -> str:
        """
        Configure multiple network settings in bulk
        
        Args:
            configs: List of network configurations
            user_id: User making the request
            
        Returns:
            str: Confirmation ID for bulk operation
            
        TODO: Validate all configurations
        TODO: Check resource limits
        TODO: Create bulk confirmation request
        """
        raise NotImplementedError("Bulk network configuration not implemented")
    
    # Subscriber Management APIs
    
    def create_subscriber(self, imsi: str, config: Dict[str, Any], user_id: str) -> str:
        """
        Create a single subscriber
        
        Args:
            imsi: IMSI of the subscriber
            config: Subscriber configuration
            user_id: User making the request
            
        Returns:
            str: Confirmation ID
            
        TODO: Validate IMSI format
        TODO: Check if IMSI already exists
        TODO: Validate configuration
        """
        raise NotImplementedError("Create subscriber not implemented")
    
    def bulk_create_subscribers(self, subscribers: List[Dict[str, Any]], user_id: str) -> str:
        """
        Create multiple subscribers in bulk
        
        Args:
            subscribers: List of subscriber configurations
            user_id: User making the request
            
        Returns:
            str: Confirmation ID for bulk operation
            
        TODO: Validate all IMSIs
        TODO: Check for duplicates
        TODO: Validate bulk limits
        """
        raise NotImplementedError("Bulk create subscribers not implemented")
    
    def import_subscribers_csv(self, csv_data: str, template_id: Optional[str], user_id: str) -> str:
        """
        Import subscribers from CSV data
        
        Args:
            csv_data: CSV content with subscriber data
            template_id: Optional template to apply
            user_id: User making the request
            
        Returns:
            str: Confirmation ID
            
        TODO: Parse CSV data
        TODO: Validate CSV format
        TODO: Apply template if provided
        """
        raise NotImplementedError("CSV import not implemented")
    
    # System Query APIs (Read-only, no confirmation needed)
    
    def query_system_status(self, query: Dict[str, Any], user_id: str) -> Dict[str, Any]:
        """
        Query system status and metrics (read-only)
        
        Args:
            query: Query parameters
            user_id: User making the request
            
        Returns:
            dict: Query results
            
        TODO: Route to appropriate backend
        TODO: Apply user filters/permissions
        TODO: Format response
        """
        raise NotImplementedError("System query not implemented")
    
    def get_analytics(self, metric_type: str, time_range: Dict[str, Any], user_id: str) -> Dict[str, Any]:
        """
        Get analytics and insights (read-only)
        
        Args:
            metric_type: Type of metric to retrieve
            time_range: Time range for analytics
            user_id: User making the request
            
        Returns:
            dict: Analytics data
            
        TODO: Fetch metrics from backend
        TODO: Apply aggregations
        TODO: Generate insights
        """
        raise NotImplementedError("Analytics not implemented")
    
    # Policy & DNN APIs
    
    def create_dnn(self, dnn_config: Dict[str, Any], user_id: str) -> str:
        """
        Create a new DNN configuration
        
        Args:
            dnn_config: DNN configuration details
            user_id: User making the request
            
        Returns:
            str: Confirmation ID
            
        TODO: Validate DNN parameters
        TODO: Check for naming conflicts
        TODO: Create confirmation request
        """
        raise NotImplementedError("Create DNN not implemented")
    
    def update_policy(self, policy_id: str, updates: Dict[str, Any], user_id: str) -> str:
        """
        Update policy configuration
        
        Args:
            policy_id: ID of policy to update
            updates: Policy updates
            user_id: User making the request
            
        Returns:
            str: Confirmation ID
            
        TODO: Validate policy exists
        TODO: Validate update parameters
        TODO: Check impact analysis
        """
        raise NotImplementedError("Update policy not implemented")
    
    def apply_policy_template(self, template_id: str, target_subscribers: List[str], user_id: str) -> str:
        """
        Apply policy template to multiple subscribers
        
        Args:
            template_id: ID of policy template
            target_subscribers: List of subscriber IMSIs
            user_id: User making the request
            
        Returns:
            str: Confirmation ID
            
        TODO: Validate template exists
        TODO: Validate all subscribers exist
        TODO: Create bulk update request
        """
        raise NotImplementedError("Apply policy template not implemented")