"""
ADK Runner setup — used by Streamlit to run the agent directly (no API).
"""
import asyncio
import logging
from google.adk.sessions import InMemorySessionService
from google.adk.runners import Runner
from google.genai import types

from agent import root_agent

logger = logging.getLogger(__name__)

APP_NAME = "handbook_app"
session_service = InMemorySessionService()

runner = Runner(
    agent=root_agent,
    app_name=APP_NAME,
    session_service=session_service,
)


def _text_from_content(content) -> str | None:
    if content is None:
        return None
    try:
        parts = getattr(content, "parts", None)
        if not parts:
            return None
        for part in parts:
            text = getattr(part, "text", None)
            if text is not None and str(text).strip():
                return str(text).strip()
    except (AttributeError, TypeError, IndexError):
        pass
    return None


async def _run_chat_async(user_id: str, session_id: str, message: str) -> str:
    session = await session_service.get_session(
        app_name=APP_NAME,
        user_id=user_id,
        session_id=session_id,
    )
    if not session:
        await session_service.create_session(
            app_name=APP_NAME,
            user_id=user_id,
            session_id=session_id,
        )

    user_content = types.Content(
        role="user",
        parts=[types.Part(text=message)],
    )

    final_response = None
    async for event in runner.run_async(
        user_id=user_id,
        session_id=session_id,
        new_message=user_content,
    ):
        try:
            if getattr(event, "is_final_response", lambda: False)() and getattr(event, "content", None):
                text = _text_from_content(event.content)
                if text:
                    final_response = text
                    break
            if getattr(event, "content", None):
                text = _text_from_content(event.content)
                if text:
                    final_response = text
        except (AttributeError, TypeError, KeyError):
            continue

    return final_response or "No response from agent. Please try again."


def run_chat(message: str, user_id: str = "default_user") -> str:
    """Run the ADK agent with the given message. Sync wrapper for Streamlit."""
    session_id = f"{user_id}_session"
    try:
        try:
            return asyncio.run(_run_chat_async(user_id, session_id, message))
        except RuntimeError as re:
            if "event loop" in str(re).lower() or "already running" in str(re).lower():
                import concurrent.futures
                with concurrent.futures.ThreadPoolExecutor(max_workers=1) as ex:
                    future = ex.submit(
                        asyncio.run, _run_chat_async(user_id, session_id, message)
                    )
                    return future.result(timeout=120)
            raise
    except Exception as e:
        logger.exception("Chat failed: %s", e)
        return f"Error: {e}"