import { randomBytes } from 'crypto';
import { hashPassword } from './accounts';

/**
 * Admin-console accounts. Replaces the original static two-account env map
 * with a persisted table; the env values remain the seed for empty databases.
 */

export interface AdminUser {
  id: string; // usr_<hex>
  username: string;
  passwordHash: string;
  active: boolean;
  createdMs: number;
}

export interface AdminUserRepo {
  list(): AdminUser[];
  findByUsername(username: string): AdminUser | undefined;
  save(user: AdminUser): void;
}

export function newAdminUserId(): string {
  return `usr_${randomBytes(6).toString('hex')}`;
}

/** The env-backed seed accounts (preserved from the pre-table behavior). */
export function seedAdminUsersFromEnv(): { username: string; password: string }[] {
  return [
    {
      username: process.env.ADMIN_USER ?? 'admin',
      password: process.env.ADMIN_KEY ?? 'admin-dev-key',
    },
    {
      username: process.env.DEMO_ADMIN_USER ?? 'demo',
      password: process.env.DEMO_ADMIN_PASSWORD ?? '$$$Adm1n###',
    },
  ];
}

export function makeAdminUser(username: string, password: string): AdminUser {
  return {
    id: newAdminUserId(),
    username,
    passwordHash: hashPassword(password),
    active: true,
    createdMs: Date.now(),
  };
}

export class InMemoryAdminUserRepo implements AdminUserRepo {
  private users: AdminUser[];

  private constructor(users: AdminUser[]) {
    this.users = users.map((u) => ({ ...u }));
  }

  static seeded(seed: { username: string; password: string }[]): InMemoryAdminUserRepo {
    return new InMemoryAdminUserRepo(seed.map((s) => makeAdminUser(s.username, s.password)));
  }

  list(): AdminUser[] {
    return [...this.users];
  }

  findByUsername(username: string): AdminUser | undefined {
    return this.users.find((u) => u.username === username);
  }

  save(user: AdminUser): void {
    const i = this.users.findIndex((u) => u.id === user.id || u.username === user.username);
    if (i >= 0) this.users[i] = user;
    else this.users.push(user);
  }
}