const path = require('path');
const fs = require('fs');
const os = require('os');

describe('load-admins', () => {
  const originalEnv = { ...process.env };
  let tmpDir;

  beforeEach(() => {
    tmpDir = fs.mkdtempSync(path.join(os.tmpdir(), 'admins-test-'));
    delete process.env.ADMIN_CONFIG_PATH;
    delete process.env.ADMIN_KEY;
  });

  afterEach(() => {
    process.env = { ...originalEnv };
    fs.rmSync(tmpDir, { recursive: true, force: true });
    jest.resetModules();
  });

  function writeConfig(admins) {
    const filePath = path.join(tmpDir, 'admins.json');
    fs.writeFileSync(filePath, JSON.stringify(admins));
    return filePath;
  }

  test('loads admins from ADMIN_CONFIG_PATH', () => {
    const configPath = writeConfig([
      { name: 'Alice', key: 'key-a' },
      { name: 'Bob', key: 'key-b' }
    ]);
    process.env.ADMIN_CONFIG_PATH = configPath;

    const { findAdminByKey } = require('../../backend/config/load-admins');
    expect(findAdminByKey('key-a')).toEqual({ name: 'Alice' });
    expect(findAdminByKey('key-b')).toEqual({ name: 'Bob' });
    expect(findAdminByKey('wrong')).toBeNull();
  });

  test('falls back to ADMIN_KEY when no config file', () => {
    process.env.ADMIN_CONFIG_PATH = path.join(tmpDir, 'nonexistent.json');
    process.env.ADMIN_KEY = 'legacy-key';

    const { findAdminByKey } = require('../../backend/config/load-admins');
    expect(findAdminByKey('legacy-key')).toEqual({ name: 'Admin' });
    expect(findAdminByKey('wrong')).toBeNull();
  });

  test('throws when neither config file nor ADMIN_KEY exists', () => {
    process.env.ADMIN_CONFIG_PATH = path.join(tmpDir, 'nonexistent.json');

    expect(() => {
      require('../../backend/config/load-admins');
    }).toThrow();
  });

  test('rejects duplicate admin names', () => {
    const configPath = writeConfig([
      { name: 'Alice', key: 'key-a' },
      { name: 'Alice', key: 'key-b' }
    ]);
    process.env.ADMIN_CONFIG_PATH = configPath;

    expect(() => {
      require('../../backend/config/load-admins');
    }).toThrow(/duplicate/i);
  });

  test('rejects duplicate keys', () => {
    const configPath = writeConfig([
      { name: 'Alice', key: 'same-key' },
      { name: 'Bob', key: 'same-key' }
    ]);
    process.env.ADMIN_CONFIG_PATH = configPath;

    expect(() => {
      require('../../backend/config/load-admins');
    }).toThrow(/duplicate/i);
  });
});