/**
 * Unit Tests — user-db.js
 */
import { describe, it, expect, beforeAll, afterAll } from 'vitest';
import fs from 'fs';
import path from 'path';
import crypto from 'crypto';

describe('user-db', () => {
  let userDb;
  const uid = crypto.randomUUID().substring(0, 8);
  const uniqueEmail = `test-${uid}@example.com`;
  const oauthEmail = `gh-${uid}@example.com`;

  beforeAll(() => {
    // user-db uses hardcoded data/users.sqlite — just clear module cache
    Object.keys(require.cache).filter(k => k.includes('user-db')).forEach(k => delete require.cache[k]);
    userDb = require(path.resolve(__dirname, '../../services/user-db'));
  });

  afterAll(() => {
    // Clean up test users (emails are unique per run via crypto UUID)
  });

  describe('createUser + findByEmail', () => {
    it('should create a user', () => {
      const user = userDb.createUser({
        email: uniqueEmail, passwordHash: 'hashed_pw',
        displayName: 'Test User', provider: 'local',
      });
      expect(user).toBeDefined();
      expect(user.id).toBeDefined();
      expect(user.email).toBe(uniqueEmail);
    });

    it('should find user by email', () => {
      const user = userDb.findByEmail(uniqueEmail);
      expect(user).toBeDefined();
      expect(user.email).toBe(uniqueEmail);
    });

    it('should return falsy for non-existent email', () => {
      expect(userDb.findByEmail('nope-nonexist@no.com')).toBeFalsy();
    });
  });

  describe('updateLastLogin', () => {
    it('should not throw', () => {
      const user = userDb.findByEmail(uniqueEmail);
      expect(() => userDb.updateLastLogin(user.id)).not.toThrow();
    });
  });

  describe('toPublicUser', () => {
    it('should strip sensitive fields', () => {
      const user = userDb.findByEmail(uniqueEmail);
      const pub = userDb.toPublicUser(user);
      expect(pub).toHaveProperty('id');
      expect(pub).toHaveProperty('email');
      expect(pub).not.toHaveProperty('password_hash');
    });
  });

  describe('findOrCreateOAuthUser', () => {
    const oauthProviderId = `test-provider-${uid}`;

    it('should create OAuth user', () => {
      const user = userDb.findOrCreateOAuthUser({
        provider: 'github', providerId: oauthProviderId,
        email: oauthEmail, displayName: 'GitHub User',
        avatarUrl: 'https://example.com/avatar.png',
      });
      expect(user).toBeDefined();
      expect(user.email).toBe(oauthEmail);
    });

    it('should find existing OAuth user on re-call', () => {
      const user = userDb.findOrCreateOAuthUser({
        provider: 'github', providerId: oauthProviderId,
        email: oauthEmail, displayName: 'GitHub User',
      });
      expect(user).toBeDefined();
      expect(user.email).toBe(oauthEmail);
    });
  });
});