import { openDB, type DBSchema } from 'idb';
import { apiPath } from './http';

export interface RememberedAccount {
  username: string;
  token: string;
  key: CryptoKey;
  vault: string;
  revision: number;
}
interface LocalIdentity extends DBSchema {
  sessions: { key: string; value: RememberedAccount };
  device: { key: string; value: { id: string; name: string } };
}
const database = () => openDB<LocalIdentity>('webdrop-account-local-2', 1, { upgrade(db) {
  db.createObjectStore('sessions'); db.createObjectStore('device');
} });
const endpoint = () => apiPath('/');
export async function rememberedAccount(): Promise<RememberedAccount | undefined> { return (await database()).get('sessions', endpoint()); }
export async function rememberAccount(value: RememberedAccount): Promise<void> { await (await database()).put('sessions', value, endpoint()); }
export async function forgetAccount(): Promise<void> { await (await database()).delete('sessions', endpoint()); }
export async function localAccountDevice(): Promise<{ id: string; name: string }> {
  const db = await database();
  const existing = await db.get('device', endpoint());
  if (existing) return existing;
  const name = /Android/i.test(navigator.userAgent) ? 'Android 浏览器' : /iPhone|iPad/i.test(navigator.userAgent) ? 'Apple 移动浏览器'
    : /Windows/i.test(navigator.userAgent) ? 'Windows 浏览器' : /Mac/i.test(navigator.userAgent) ? 'Mac 浏览器' : '浏览器设备';
  const value = { id: crypto.randomUUID(), name };
  await db.put('device', value, endpoint());
  return value;
}
export async function saveDeviceName(name: string): Promise<void> {
  const device = await localAccountDevice(); await (await database()).put('device', { ...device, name }, endpoint());
}