from fastapi import APIRouter, HTTPException
from services.memory import (
    get_all_sessions,
    get_or_create_session,
    delete_session,
    update_session_title,
    update_session_persona,
    get_history,
    get_message_count
)

router = APIRouter(prefix="/sessions", tags=["sessions"])


@router.get("/")
async def list_sessions():
    sessions = await get_all_sessions()
    result = []
    for s in sessions:
        count = await get_message_count(s["session_id"])
        result.append({**s, "message_count": count})
    return result


@router.get("/{session_id}")
async def get_session(session_id: str):
    sessions = await get_all_sessions()
    s = next((x for x in sessions if x["session_id"] == session_id), None)
    if not s:
        raise HTTPException(status_code=404, detail="Сессия не найдена")
    return s


@router.patch("/{session_id}")
async def patch_session(session_id: str, data: dict):
    # ensure session exists before patching
    await get_or_create_session(session_id, data.get("persona_id", "default"))
    if "title" in data:
        await update_session_title(session_id, data["title"])
    if "persona_id" in data:
        await update_session_persona(session_id, data["persona_id"])
    return {"status": "updated"}


@router.delete("/{session_id}")
async def remove_session(session_id: str):
    await delete_session(session_id)
    return {"status": "deleted", "session_id": session_id}