import os
import hashlib
import time

class SessionManager:
    def __init__(self):
        self.sessions: dict[str, dict] = {}

    def create_session(self, account: dict, device_id: str) -> str:
        token_raw = os.urandom(32)
        token = hashlib.sha256(token_raw).hexdigest()
        self.sessions[token] = {
            "account": account,
            "device_id": device_id,
            "created_at": int(time.time()),
        }
        return token

    def get_context(self, token: str) -> dict | None:
        return self.sessions.get(token)