from typing import Callable, Dict

ACTION_REGISTRY: Dict[str, Callable] = {}
ACTION_SCHEMAS: Dict[str, dict] = {}

def register_action(name: str, schema=None):
    def decorator(func):
        ACTION_REGISTRY[name] = func
        ACTION_SCHEMAS[name] = schema or {}
        return func
    return decorator

def validate_action_schema(action_name, params):
    schema = ACTION_SCHEMAS.get(action_name, {})
    required = schema.get("required", [])

    for key in required:
        if key not in params:
            raise Exception(f"Action '{action_name}' missing required param: {key}")

    return True