function decodeJwt(token: string) {
  try {
    const payload = token.split(".")[1]
    const decoded = JSON.parse(atob(payload))
    return decoded
  } catch {
    return null
  }
}
export function useAuth() {
  const token = useState<string | null>("token", () => null)

  function setToken(t: string) {
    token.value = t

    if (typeof window !== "undefined") {
      localStorage.setItem("token", t)
    }
  }

  function loadToken() {
    if (typeof window !== "undefined") {
      const stored = localStorage.getItem("token")
      if (!stored) return

        const payload = decodeJwt(stored)
        if( !payload || !payload.exp || payload.exp * 1000 < Date.now()) {
          console.info("Token expired - removing it from storage")
          localStorage.removeItem("token")
          token.value = null
        }
        token.value = stored
      
    }
  }

  function logout() {
    token.value = null

    if (typeof window !== "undefined") {
      localStorage.removeItem("token")
    }
  }

  return { token, setToken, loadToken, logout }
}