import { describe, it, expect, beforeEach } from 'vitest';
import { initDb } from '../../src/db/schema.ts';
import { createUser, getUserByUsername, getUserById } from '../../src/db/users.ts';
import type Database from 'better-sqlite3';

describe('db/users', () => {
  let db: Database.Database;

  beforeEach(() => {
    db = initDb(':memory:');
  });

  it('creates a user and retrieves by username', () => {
    const user = createUser(db, { username: 'alice', passwordHash: 'hash123' });

    expect(user.id).toBeTypeOf('number');
    expect(user.username).toBe('alice');
    expect(user.password_hash).toBe('hash123');
    expect(user.created_at).toBeTruthy();

    const found = getUserByUsername(db, 'alice');
    expect(found).toEqual(user);
  });

  it('returns undefined for unknown username', () => {
    expect(getUserByUsername(db, 'ghost')).toBeUndefined();
  });

  it('retrieves user by id', () => {
    const user = createUser(db, { username: 'bob', passwordHash: 'hash456' });
    const found = getUserById(db, user.id);
    expect(found).toEqual(user);
  });

  it('returns undefined for unknown id', () => {
    expect(getUserById(db, 999)).toBeUndefined();
  });

  it('enforces unique username constraint', () => {
    createUser(db, { username: 'carol', passwordHash: 'hash' });
    expect(() => createUser(db, { username: 'carol', passwordHash: 'other' })).toThrow();
  });
});