blockchain/apps/portal/lib/last-login.ts

/**
 * Remember which sign-in method the user last used (local only).
 */

export type LoginMethodId = "email" | "konnos" | "metamask" | "mavi";

const KEY = "krypco_last_login_method";

export function readLastLoginMethod(): LoginMethodId | null {
  if (typeof window === "undefined") return null;
  try {
    const v = window.localStorage.getItem(KEY);
    if (
      v === "email" ||
      v === "konnos" ||
      v === "metamask" ||
      v === "mavi"
    ) {
      return v;
    }
    return null;
  } catch {
    return null;
  }
}

export function writeLastLoginMethod(method: LoginMethodId): void {
  if (typeof window === "undefined") return;
  try {
    window.localStorage.setItem(KEY, method);
  } catch {
    /* ignore */
  }
}

export function lastLoginLabel(method: LoginMethodId): string {
  switch (method) {
    case "email":
      return "Email code";
    case "konnos":
      return "Konnos";
    case "metamask":
      return "MetaMask";
    case "mavi":
      return "mavi wallet";
  }
}