"""
Free-form, read-only chat with GPT-4o about the current cockpit state.
No function-calling — this endpoint can never trigger an action.
"""
from typing import List, Optional

from fastapi import APIRouter, HTTPException
from pydantic import BaseModel

from services.ai_chat_context import CONTEXT_BLOCKS

router = APIRouter(prefix="/api/ai-chat", tags=["ai-chat"])


class ChatMessageBody(BaseModel):
    session_id: str
    message: str
    enabled_blocks: Optional[List[str]] = None
    refresh_context: bool = False


class ClearBody(BaseModel):
    session_id: str


@router.get("/blocks")
def list_context_blocks():
    """Static list of context block keys the frontend can offer as toggles."""
    return {"blocks": CONTEXT_BLOCKS}


@router.post("/")
def send_message(body: ChatMessageBody):
    from services.ai_chat import send_chat_message
    if not body.message.strip():
        raise HTTPException(400, "Message vide.")
    try:
        return send_chat_message(
            session_id=body.session_id,
            message=body.message.strip(),
            enabled_blocks=body.enabled_blocks,
            refresh_context=body.refresh_context,
        )
    except RuntimeError as exc:
        raise HTTPException(400, str(exc)) from exc


@router.get("/history")
def get_history(session_id: str):
    from services.database import get_chat_messages
    return {"messages": get_chat_messages(session_id)}


@router.post("/clear")
def clear_session(body: ClearBody):
    from services.database import clear_chat_session
    from services.ai_chat_context import clear_context_cache
    clear_chat_session(body.session_id)
    clear_context_cache(body.session_id)
    return {"cleared": body.session_id}