from __future__ import annotations

import shutil
import tempfile
import uuid
from pathlib import Path

from fastapi import HTTPException

from app.models.session import SessionState


class SessionStore:
    def __init__(self) -> None:
        self._sessions: dict[str, SessionState] = {}

    def create(self) -> SessionState:
        session_id = uuid.uuid4().hex
        workdir = Path(tempfile.mkdtemp(prefix=f"mesa_{session_id[:8]}_"))
        state = SessionState(session_id=session_id, workdir=workdir)
        self._sessions[session_id] = state
        return state

    def get(self, session_id: str) -> SessionState:
        state = self._sessions.get(session_id)
        if state is None:
            raise HTTPException(status_code=404, detail="Sessao nao encontrada")
        return state

    def delete(self, session_id: str) -> None:
        state = self._sessions.pop(session_id, None)
        if state is None:
            return
        shutil.rmtree(state.workdir, ignore_errors=True)


session_store = SessionStore()