import { validateEnv } from './index';

const validEnv = {
  NODE_ENV: 'development',
  DATABASE_URL: 'postgresql://tower:tower_dev@localhost:5432/tower_dev',
  REDIS_URL: 'redis://localhost:6379',
  JWT_SECRET: 'a_super_secret_key_that_is_at_least_32_chars_long',
} as unknown as NodeJS.ProcessEnv;

describe('validateEnv', () => {
  it('returns parsed config for valid env', () => {
    const result = validateEnv(validEnv);
    expect(result.NODE_ENV).toBe('development');
    expect(result.API_PORT).toBe(3001);
  });

  it('applies default API_PORT of 3001 when not set', () => {
    const result = validateEnv(validEnv);
    expect(result.API_PORT).toBe(3001);
  });

  it('throws when DATABASE_URL is missing', () => {
    const { DATABASE_URL, ...withoutDb } = validEnv as Record<string, string>;
    expect(() =>
      validateEnv(withoutDb as unknown as NodeJS.ProcessEnv),
    ).toThrow('Invalid environment variables');
  });

  it('throws when JWT_SECRET is shorter than 32 chars', () => {
    expect(() =>
      validateEnv({ ...validEnv, JWT_SECRET: 'tooshort' } as unknown as NodeJS.ProcessEnv),
    ).toThrow('Invalid environment variables');
  });

  it('throws when DATABASE_URL is not a valid URL', () => {
    expect(() =>
      validateEnv({ ...validEnv, DATABASE_URL: 'not-a-url' } as unknown as NodeJS.ProcessEnv),
    ).toThrow('Invalid environment variables');
  });

  it('applies default WHATSAPP_SESSION_PATH of ./sessions when not set', () => {
    const env = {
      DATABASE_URL: 'postgresql://user:pass@localhost:5432/db',
      REDIS_URL: 'redis://localhost:6379',
      JWT_SECRET: 'a'.repeat(32),
    };
    const result = validateEnv(env as NodeJS.ProcessEnv);
    expect(result.WHATSAPP_SESSION_PATH).toBe('./sessions');
  });

  it('applies default TOWER_ADMIN_JIDS of empty string when not set', () => {
    const env = {
      DATABASE_URL: 'postgresql://user:pass@localhost:5432/db',
      REDIS_URL: 'redis://localhost:6379',
      JWT_SECRET: 'a'.repeat(32),
    };
    const result = validateEnv(env as NodeJS.ProcessEnv);
    expect(result.TOWER_ADMIN_JIDS).toBe('');
  });
});