"use client";

import {
  DEMO_SESSION_KEY,
  type DemoSession,
} from "@/lib/auth-config";

export function readDemoSession(): DemoSession | null {
  if (typeof window === "undefined") return null;
  try {
    const raw = window.localStorage.getItem(DEMO_SESSION_KEY);
    if (!raw) return null;
    return JSON.parse(raw) as DemoSession;
  } catch {
    return null;
  }
}

export function writeDemoSession(session: DemoSession): void {
  window.localStorage.setItem(DEMO_SESSION_KEY, JSON.stringify(session));
  window.dispatchEvent(new Event("krypco-auth-change"));
}

export function clearDemoSession(): void {
  window.localStorage.removeItem(DEMO_SESSION_KEY);
  window.dispatchEvent(new Event("krypco-auth-change"));
}

export function createDemoEmailSession(email: string): DemoSession {
  return {
    kind: "demo",
    userId: `demo_${email.toLowerCase().replace(/[^a-z0-9]/g, "_")}`,
    label: email,
    createdAt: new Date().toISOString(),
  };
}

export function createDemoWalletSession(address: string): DemoSession {
  const short = `${address.slice(0, 6)}…${address.slice(-4)}`;
  return {
    kind: "wallet",
    userId: `wallet_${address.toLowerCase()}`,
    label: short,
    walletAddress: address,
    createdAt: new Date().toISOString(),
  };
}