import { describe, expect, test } from 'bun:test';
import { prefixEnvText } from './env-prefix';

// This rewrites the file the whole platform reads its database credential from, and it runs on every
// restart from the settings screen. The tests are about what it must NOT do.

describe('prefixing', () => {
  test('renames an ordinary variable', () => {
    expect(prefixEnvText('PORT="9000"').text).toBe('OFFICERDEV_PORT="9000"');
  });

  test('leaves the value completely alone, including an = inside it', () => {
    const line = 'POSTGRES_URL="postgresql://u:p=a=ss@127.0.0.1:5432/officer"';
    expect(prefixEnvText(line).text).toBe(`OFFICERDEV_${line}`);
  });

  test('is idempotent — it runs on every restart', () => {
    const once = prefixEnvText('PORT="9000"').text;
    const twice = prefixEnvText(once);
    expect(twice.text).toBe(once);
    expect(twice.changed).toEqual([]);
    expect(twice.alreadyPrefixed).toBe(1);
  });
});

describe('what it must not touch', () => {
  test('comments and blank lines survive', () => {
    const text = '# the port\n\nPORT="9000"\n# trailing note\n';
    const out = prefixEnvText(text).text;
    expect(out).toContain('# the port');
    expect(out).toContain('# trailing note');
    expect(out.split('\n').length).toBe(text.split('\n').length);
  });

  test('a commented-out assignment stays commented out', () => {
    expect(prefixEnvText('# PORT="9000"').text).toBe('# PORT="9000"');
  });

  test('variables belonging to other software are left alone', () => {
    // Prefixing one of these does not rename a variable, it deletes it: nothing reads OFFICERDEV_PATH.
    for (const key of ['NODE_ENV', 'PATH', 'HOME', 'TZ']) {
      expect(prefixEnvText(`${key}=x`).text).toBe(`${key}=x`);
    }
  });

  test('an `export` prefix is preserved', () => {
    expect(prefixEnvText('export PORT=9000').text).toBe('export OFFICERDEV_PORT=9000');
  });

  test('a line that is not an assignment passes through', () => {
    expect(prefixEnvText('this is not an env line').text).toBe('this is not an env line');
  });
});