"""Superadmin authentication and audit decorators."""
import logging
from functools import wraps
from datetime import datetime, timezone

from flask import request, g

from gatehouse_app.utils.response import api_response


logger = logging.getLogger(__name__)


def superadmin_required(f):
    """Decorator to require superadmin Bearer token authentication.
    
    Extracts token from Authorization: Bearer {token} header,
    validates the session against SuperadminSession table,
    and sets g.current_superadmin and g.superadmin_session.
    
    Returns 401 if no valid session, 403 if not a superadmin.
    """
    @wraps(f)
    def decorated_function(*args, **kwargs):
        # Extract token from Authorization header
        auth_header = request.headers.get('Authorization')
        
        if not auth_header:
            return api_response(
                success=False,
                message="Authorization header is required",
                status=401,
                error_type="AUTH_REQUIRED"
            )
        
        # Expect format: "Bearer {token}"
        parts = auth_header.split()
        if len(parts) != 2 or parts[0].lower() != 'bearer':
            return api_response(
                success=False,
                message="Invalid authorization format. Use: Bearer {token}",
                status=401,
                error_type="INVALID_AUTH_FORMAT"
            )
        
        token = parts[1]
        
        # Import here to avoid circular imports
        from gatehouse_app.models.superadmin import SuperadminSession, Superadmin
        
        # Get active session by token
        session = SuperadminSession.query.filter_by(token=token).first()
        
        if not session:
            return api_response(
                success=False,
                message="Invalid or expired session",
                status=401,
                error_type="INVALID_TOKEN"
            )
        
        # Check if session is active
        if not session.is_active():
            return api_response(
                success=False,
                message="Session is no longer active",
                status=401,
                error_type="SESSION_INACTIVE"
            )
        
        # Get the superadmin
        superadmin = session.superadmin
        if not superadmin:
            return api_response(
                success=False,
                message="Superadmin not found",
                status=401,
                error_type="INVALID_TOKEN"
            )
        
        # Check if superadmin is active
        if not superadmin.is_active:
            return api_response(
                success=False,
                message="Superadmin account is disabled",
                status=403,
                error_type="ACCOUNT_DISABLED"
            )
        
        # Update last_activity_at timestamp
        session.last_activity_at = datetime.now(timezone.utc)
        from gatehouse_app import db
        db.session.commit()
        
        # Set context variables
        g.current_superadmin = superadmin
        g.superadmin_session = session
        
        return f(*args, **kwargs)
    
    return decorated_function


def superadmin_audit_log(action, resource_type):
    """Decorator to log superadmin actions to SuperadminAuditLog.
    
    Must be used AFTER @superadmin_required to have access to g.current_superadmin.
    
    Args:
        action: The action being performed (e.g., 'update', 'delete', 'create')
        resource_type: The type of resource being acted on (e.g., 'organization', 'user')
    
    Captures: superadmin_id, action, resource_type, resource_id, org_id, user_id,
              ip_address, user_agent, request_id, extra_data
    """
    def decorator(f):
        @wraps(f)
        def decorated_function(*args, **kwargs):
            # Get superadmin from context (set by @superadmin_required)
            superadmin = getattr(g, 'current_superadmin', None)
            session = getattr(g, 'superadmin_session', None)
            
            if not superadmin:
                logger.warning(f"superadmin_audit_log used without @superadmin_required on {f.__name__}")
                return f(*args, **kwargs)
            
            # Extract resource_id from kwargs if present
            resource_id = kwargs.get('resource_id') or kwargs.get(f'{resource_type}_id') or None
            
            # Extract org_id and user_id from kwargs if present
            org_id = kwargs.get('org_id') or None
            user_id = kwargs.get('user_id') or None
            
            # Get IP address and user agent
            ip_address = request.remote_addr or None
            user_agent = request.headers.get('User-Agent') or None
            request_id = request.headers.get('X-Request-ID') or None
            
            # Get extra data from request body (for POST/PATCH requests)
            extra_data = None
            if request.is_json:
                try:
                    # Exclude sensitive fields
                    body = request.get_json(silent=True) or {}
                    sensitive_fields = {'password', 'password_hash', 'token', 'secret', 'key'}
                    extra_data = {k: v for k, v in body.items() if k not in sensitive_fields}
                except Exception:
                    pass
            
            # Get success status (default to True unless an error is raised)
            success = True
            error_message = None
            
            try:
                result = f(*args, **kwargs)
                
                # Check if the response indicates failure
                if hasattr(result, 'get_json'):
                    result_data = result.get_json()
                    if result_data and result_data.get('success') is False:
                        success = False
                        error_message = result_data.get('message')
                
                return result
                
            except Exception as e:
                success = False
                error_message = str(e)
                raise
                
            finally:
                # Log the action
                try:
                    from gatehouse_app.models.superadmin_audit_log import SuperadminAuditLog
                    from gatehouse_app import db
                    
                    audit_entry = SuperadminAuditLog(
                        superadmin_id=superadmin.id,
                        action=action,
                        resource_type=resource_type,
                        resource_id=resource_id,
                        org_id=org_id,
                        user_id=user_id,
                        ip_address=ip_address,
                        user_agent=user_agent,
                        request_id=request_id,
                        extra_data=extra_data,
                        success=success,
                        error_message=error_message
                    )
                    db.session.add(audit_entry)
                    db.session.commit()
                    
                    logger.info(
                        f"Superadmin audit: superadmin={superadmin.email} action={action} "
                        f"resource_type={resource_type} resource_id={resource_id} success={success}"
                    )
                except Exception as e:
                    # Never let audit logging failures break the main operation
                    logger.error(f"Failed to write superadmin audit log: {e}")
        
        return decorated_function
    return decorator