export interface JwtPayload {
  sub?: string
  role?: string
  exp?: number
  iat?: number
}

export function parseJwtPayload(token: string): JwtPayload {
  try {
    const base64Url = token.split('.')[1]
    const base64 = base64Url.replace(/-/g, '+').replace(/_/g, '/')
    const jsonPayload = decodeURIComponent(
      atob(base64)
        .split('')
        .map((c) => '%' + ('00' + c.charCodeAt(0).toString(16)).slice(-2))
        .join(''),
    )
    return JSON.parse(jsonPayload)
  } catch {
    return {}
  }
}

export function isTokenExpired(token: string | null): boolean {
  if (!token) return true
  const payload = parseJwtPayload(token)
  if (payload.exp === undefined || payload.exp === null) return false
  return payload.exp < Math.floor(Date.now() / 1000)
}