import { validateEnv } from '../../src/envValidation';

// The smallest environment that should boot: demo mode on, a database, and
// somewhere to put uploads. Everything else is optional or conditional.
const MINIMAL: NodeJS.ProcessEnv = {
  DEMO_MODE: 'true',
  PGHOST: 'localhost',
  PGPORT: '5432',
  PGUSER: 'someone',
  PGPASSWORD: 'secret',
  PGDATABASE: 'redefined',
  UPLOADS_DIR: '/tmp/uploads'
};

const withEnv = (extra: NodeJS.ProcessEnv): NodeJS.ProcessEnv => ({ ...MINIMAL, ...extra });

// `undefined` removes a key rather than setting it to the string "undefined".
const without = (...names: string[]): NodeJS.ProcessEnv => {
  const env = { ...MINIMAL };
  for (const name of names) delete env[name];
  return env;
};

describe('validateEnv', () => {
  it('accepts the minimal environment local development already uses', () => {
    expect(validateEnv(MINIMAL).errors).toEqual([]);
  });

  describe('variables that are always required', () => {
    it.each(['PGHOST', 'PGPORT', 'PGUSER', 'PGPASSWORD', 'PGDATABASE', 'UPLOADS_DIR'])(
      'refuses to boot without %s',
      (name) => {
        const { errors } = validateEnv(without(name));
        expect(errors.some((e) => e.includes(name))).toBe(true);
      }
    );

    // The fallback of '/app/uploads' is right inside the container and wrong
    // everywhere else, which is why this one gets no reprieve.
    it('names UPLOADS_DIR rather than silently accepting its fallback', () => {
      const { errors } = validateEnv(without('UPLOADS_DIR'));
      expect(errors.some((e) => e.includes('UPLOADS_DIR'))).toBe(true);
    });

    // Reporting one problem per boot makes fixing a fresh environment a
    // sequence of restarts.
    it('reports every problem at once rather than stopping at the first', () => {
      const { errors } = validateEnv(without('PGHOST', 'PGUSER', 'UPLOADS_DIR'));
      expect(errors).toHaveLength(3);
    });
  });

  describe('DEMO_MODE', () => {
    it('is required', () => {
      const { errors } = validateEnv(without('DEMO_MODE'));
      expect(errors.some((e) => e.includes('DEMO_MODE'))).toBe(true);
    });

    it.each(['true', 'false'])('accepts the exact value %s', (value) => {
      const env = withEnv({
        DEMO_MODE: value,
        // Real payments need credentials; supplied so this case tests DEMO_MODE
        // alone rather than tripping the PayPal rule.
        PAYPAL_CLIENT_ID: 'id',
        PAYPAL_CLIENT_SECRET: 'secret',
        PAYPAL_WEBHOOK_ID: 'hook',
        PAYPAL_ENV: 'sandbox'
      });
      expect(validateEnv(env).errors).toEqual([]);
    });

    // The whole point of this issue. Before, any value that was not exactly
    // 'false' meant demo mode was on — so a typo silently stopped the shop
    // charging anyone.
    it.each(['False', 'FALSE', '0', 'no', 'flase', ''])(
      'refuses %p rather than reading it as demo mode',
      (value) => {
        const { errors } = validateEnv(withEnv({ DEMO_MODE: value }));
        expect(errors.some((e) => e.includes('DEMO_MODE'))).toBe(true);
      }
    );

    it('quotes the value it was given, so the typo is visible in the message', () => {
      const { errors } = validateEnv(withEnv({ DEMO_MODE: 'False' }));
      expect(errors.find((e) => e.includes('DEMO_MODE'))).toContain("'False'");
    });
  });

  describe('PayPal credentials', () => {
    // QA runs with no PayPal on purpose, so this cannot be an unconditional
    // requirement — it is tied to real payments being switched on.
    it('are not required while demo mode is on', () => {
      expect(validateEnv(withEnv({ DEMO_MODE: 'true' })).errors).toEqual([]);
    });

    it.each(['PAYPAL_CLIENT_ID', 'PAYPAL_CLIENT_SECRET', 'PAYPAL_WEBHOOK_ID', 'PAYPAL_ENV'])(
      'are required when demo mode is off — missing %s',
      (name) => {
        const full = withEnv({
          DEMO_MODE: 'false',
          PAYPAL_CLIENT_ID: 'id',
          PAYPAL_CLIENT_SECRET: 'secret',
          PAYPAL_WEBHOOK_ID: 'hook',
          PAYPAL_ENV: 'live'
        });
        delete full[name];

        const { errors } = validateEnv(full);
        expect(errors.some((e) => e.includes(name))).toBe(true);
      }
    );
  });

  describe('SMTP', () => {
    it('is optional, and its absence is a warning rather than an error', () => {
      const { errors, warnings } = validateEnv(MINIMAL);
      expect(errors).toEqual([]);
      expect(warnings.some((w) => w.includes('SMTP'))).toBe(true);
    });

    // Half-configured is worse than not configured: it looks set up and fails
    // at send time.
    it('refuses SMTP_USER without SMTP_PASSWORD', () => {
      const { errors } = validateEnv(withEnv({ SMTP_USER: 'someone', PUBLIC_URL: 'https://x.test' }));
      expect(errors.some((e) => e.includes('SMTP_PASSWORD'))).toBe(true);
    });

    it('refuses SMTP_PASSWORD without SMTP_USER', () => {
      const { errors } = validateEnv(withEnv({ SMTP_PASSWORD: 'secret', PUBLIC_URL: 'https://x.test' }));
      expect(errors.some((e) => e.includes('SMTP_USER'))).toBe(true);
    });

    it('accepts both together', () => {
      const env = withEnv({
        SMTP_USER: 'someone',
        SMTP_PASSWORD: 'secret',
        PUBLIC_URL: 'https://x.test',
        MAIL_ALLOWLIST: 'someone@example.com'
      });
      expect(validateEnv(env).errors).toEqual([]);
    });
  });

  describe('PUBLIC_URL', () => {
    // It exists only to build links in email. A local environment that cannot
    // send mail does not need it, and demanding it would break every existing
    // local setup to prevent nothing.
    it('is not required when no mail can be sent', () => {
      expect(validateEnv(MINIMAL).errors).toEqual([]);
    });

    it('is required once SMTP is configured, because the links would read undefined', () => {
      const env = withEnv({ SMTP_USER: 'someone', SMTP_PASSWORD: 'secret' });
      const { errors } = validateEnv(env);
      expect(errors.some((e) => e.includes('PUBLIC_URL'))).toBe(true);
    });
  });

  describe('warnings that are not failures', () => {
    // An environment that can send mail with no allowlist can reach real
    // customers, which is what #87 exists to prevent.
    it('warns when mail can be sent with no allowlist', () => {
      const env = withEnv({ SMTP_USER: 'someone', SMTP_PASSWORD: 'secret', PUBLIC_URL: 'https://x.test' });
      const { warnings } = validateEnv(env);
      expect(warnings.some((w) => w.includes('MAIL_ALLOWLIST'))).toBe(true);
    });

    it('does not warn about the allowlist when there is no way to send mail', () => {
      const { warnings } = validateEnv(MINIMAL);
      expect(warnings.some((w) => w.includes('MAIL_ALLOWLIST'))).toBe(false);
    });

    it('warns when the admin gate is inactive', () => {
      const { warnings } = validateEnv(MINIMAL);
      expect(warnings.some((w) => w.includes('ADMIN_GATE_SECRET'))).toBe(true);
    });

    it('stays quiet about the admin gate once it is configured', () => {
      const { warnings } = validateEnv(withEnv({ ADMIN_GATE_SECRET: 'a-secret' }));
      expect(warnings.some((w) => w.includes('ADMIN_GATE_SECRET'))).toBe(false);
    });
  });

  // A variable set to spaces is a configuration mistake, not a value.
  it('treats a whitespace-only value as absent', () => {
    const { errors } = validateEnv(withEnv({ UPLOADS_DIR: '   ' }));
    expect(errors.some((e) => e.includes('UPLOADS_DIR'))).toBe(true);
  });
});

// #103. Optional, like the admin gate: unset is a working configuration with
// one defence switched off, and set-but-wrong is worse than either.
describe('UPLOADS_BASE_URL', () => {
  it('warns when it is unset, since the isolation is simply off', () => {
    const { errors, warnings } = validateEnv(MINIMAL);
    expect(errors).not.toContainEqual(expect.stringContaining('UPLOADS_BASE_URL'));
    expect(warnings).toContainEqual(expect.stringContaining('UPLOADS_BASE_URL is not set'));
  });

  it('is satisfied by an absolute origin', () => {
    const { errors, warnings } = validateEnv(withEnv({ UPLOADS_BASE_URL: 'https://uploads.example.com' }));
    expect(errors).not.toContainEqual(expect.stringContaining('UPLOADS_BASE_URL'));
    expect(warnings).not.toContainEqual(expect.stringContaining('UPLOADS_BASE_URL'));
  });

  // A hostname with no scheme joins onto a stored path as if it were relative,
  // which breaks every image on the site rather than failing visibly. Refusing
  // to start is the kinder outcome.
  it('refuses a value with no scheme', () => {
    const { errors } = validateEnv(withEnv({ UPLOADS_BASE_URL: 'uploads.example.com' }));
    expect(errors).toContainEqual(expect.stringContaining('absolute origin'));
  });

  it('refuses a path rather than an origin', () => {
    const { errors } = validateEnv(withEnv({ UPLOADS_BASE_URL: '/uploads' }));
    expect(errors).toContainEqual(expect.stringContaining('absolute origin'));
  });
});