import { describe, it, expect, beforeEach, afterEach } from 'vitest';

describe('config', () => {
  const originalEnv = process.env;

  beforeEach(() => {
    process.env = { ...originalEnv };
  });

  afterEach(() => {
    process.env = originalEnv;
  });

  it('returns defaults when env vars are not set', async () => {
    process.env.JWT_SECRET = 'test-secret';
    delete process.env.PORT;
    delete process.env.HOST;
    delete process.env.JWT_EXPIRY;
    delete process.env.DB_PATH;
    delete process.env.UPLOAD_DIR;
    delete process.env.LOG_FILE;
    delete process.env.MAX_FILE_SIZE;
    delete process.env.BASE_URL;
    delete process.env.COOKIE_SECURE;
    delete process.env.TRUST_PROXY;

    const { loadConfig } = await import('../../src/config.ts');
    const config = loadConfig();

    expect(config.port).toBe(3000);
    expect(config.host).toBe('0.0.0.0');
    expect(config.jwtExpiry).toBe('7d');
    expect(config.dbPath).toBe('./data/nanodrop.db');
    expect(config.uploadDir).toBe('./data/uploads');
    expect(config.logFile).toBe('./data/nanodrop.log');
    expect(config.maxFileSize).toBe(104857600);
    expect(config.baseUrl).toBe('http://localhost:3000');
    expect(config.cookieSecure).toBe(false);
    expect(config.trustProxy).toBe(false);
  });

  it('reads values from env vars', async () => {
    process.env.JWT_SECRET = 'my-secret';
    process.env.PORT = '4000';
    process.env.HOST = '127.0.0.1';
    process.env.JWT_EXPIRY = '1d';
    process.env.COOKIE_SECURE = 'true';
    process.env.TRUST_PROXY = 'true';
    process.env.MAX_FILE_SIZE = '52428800';

    const { loadConfig } = await import('../../src/config.ts');
    const config = loadConfig();

    expect(config.port).toBe(4000);
    expect(config.host).toBe('127.0.0.1');
    expect(config.jwtSecret).toBe('my-secret');
    expect(config.jwtExpiry).toBe('1d');
    expect(config.cookieSecure).toBe(true);
    expect(config.trustProxy).toBe(true);
    expect(config.maxFileSize).toBe(52428800);
  });

  it('throws when JWT_SECRET is missing', async () => {
    delete process.env.JWT_SECRET;
    const { loadConfig } = await import('../../src/config.ts');
    expect(() => loadConfig()).toThrow('JWT_SECRET');
  });
});