# Copyright 2025 Google LLC
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# --8<-- [start:callback_basic]
from google.adk.agents import LlmAgent
from google.adk.agents.callback_context import CallbackContext
from google.adk.models import LlmResponse, LlmRequest
from typing import Optional

# --- Define your callback function ---
def my_before_model_logic(
    callback_context: CallbackContext, llm_request: LlmRequest
) -> Optional[LlmResponse]:
    print(f"Callback running before model call for agent: {callback_context.agent_name}")
    # ... your custom logic here ...
    return None # Allow the model call to proceed

# --- Register it during Agent creation ---
my_agent = LlmAgent(
    name="MyCallbackAgent",
    model="gemini-2.0-flash", # Or your desired model
    instruction="Be helpful.",
    # Other agent parameters...
    before_model_callback=my_before_model_logic # Pass the function here
)
# --8<-- [end:callback_basic]

APP_NAME = "guardrail_app"
USER_ID = "user_1"
SESSION_ID = "session_001"

from google.adk.runners import Runner
from google.genai import types 
from google.adk.sessions import InMemorySessionService

# Session and Runner
async def setup_session_and_runner():
    session_service = InMemorySessionService()
    session = await session_service.create_session(app_name=APP_NAME, user_id=USER_ID, session_id=SESSION_ID)
    runner = Runner(agent=my_agent, app_name=APP_NAME, session_service=session_service)
    return session, runner

# Agent Interaction
async def call_agent_async(query):
    content = types.Content(role='user', parts=[types.Part(text=query)])
    session, runner = await setup_session_and_runner()
    events = runner.run_async(user_id=USER_ID, session_id=SESSION_ID, new_message=content)

    async for event in events:
        if event.is_final_response():
            final_response = event.content.parts[0].text
            print("Agent Response: ", final_response)

# Note: In Colab, you can directly use 'await' at the top level.
# If running this code as a standalone Python script, you'll need to use asyncio.run() or manage the event loop.
await call_agent_async("write a short joke")