from __future__ import annotations
import sys
import traceback
from typing import List, Dict, Callable
from agentkit.types import PluginConfigParam, HookInfo


class AgentKitHooks:
    HookRegistry: Dict[str, List[HookInfo]] = {}

    @classmethod
    def register(cls, hook_name: str, class_: Callable,
                 id: str, name: str = "", description: str = "",
                 param_def: list[PluginConfigParam] = []):
        if hook_name not in cls.HookRegistry:
            cls.HookRegistry[hook_name] = []

        if name == "":
            name = id
        
        cls.HookRegistry[hook_name].append(HookInfo(
            id=id,
            name=name,
            description=description,
            params_def=param_def,
            class_=class_
        ))

    @classmethod
    def get(cls, hook_name: str) -> List[HookInfo]:
        return cls.HookRegistry.get(hook_name, [])
    
    @classmethod
    def instantiate(cls, hook_name: str, hook_item_params: dict) -> List[Callable]:
        needle_hook_ids = list(hook_item_params.keys())
        instances = []
        for hook_info in cls.get(hook_name):
            if hook_info["id"] in needle_hook_ids:
                params = hook_item_params[hook_info["id"]]
                try:
                    instance = hook_info["class_"](**params)
                    instances.append(instance)
                except Exception as e:
                    print(f"Error instantiating hook {hook_info['id']}: {e}", file=sys.stderr)
                    traceback.print_exc()

        return instances
    
def agentkit_preprocessor(orig_class: Callable, id: str, name: str = "", description: str = "",
                       param_def: list[PluginConfigParam] = []):
    AgentKitHooks.register("preprocessor", orig_class, id, name, description, param_def)
    return orig_class

def agentkit_postprocessor(orig_class: Callable, id: str, name: str = "", description: str = "",
                            param_def: list[PluginConfigParam] = []):
    AgentKitHooks.register("postprocessor", orig_class, id, name, description, param_def)
    return orig_class

def agentkit_func_call_handler(orig_class: Callable, id: str, name: str = "", description: str = "",
                                   param_def: list[PluginConfigParam] = []):
    AgentKitHooks.register("func_call_handler", orig_class, id, name, description, param_def)
    return orig_class