/**
 * Tests for platform/env.js
 * Uses Node.js built-in test runner (node --test)
 */

import { test, describe, beforeEach } from 'node:test';
import assert from 'node:assert';
import { 
  initEnv, 
  getConfig, 
  setConfig, 
  getConfigDict,
  isDevelopment,
  isProduction,
  CONFIG_KEYS
} from '../src/platform/env.js';

describe('env.js', () => {
  beforeEach(() => {
    // Reset config before each test
    initEnv({});
  });

  describe('initEnv', () => {
    test('should initialize config with provided values', () => {
      const appConfig = {
        name: 'TestApp',
        displayName: 'Test Application',
        brandLogo: '/logo.png',
        ui_shell: 'DashboardShell',
        storage: { backend: 'indexedDB' },
        api: { baseURL: '/api/v1' },
        modules: ['core', 'dummy']
      };

      initEnv(appConfig);

      const config = getConfigDict();
      assert.strictEqual(config.APP_NAME, 'TestApp');
      assert.strictEqual(config.APP_DISPLAY_NAME, 'Test Application');
      assert.strictEqual(config.BRAND_LOGO, '/logo.png');
      assert.strictEqual(config.UI_SHELL, 'DashboardShell');
      assert.strictEqual(config.STORAGE_BACKEND, 'indexedDB');
      assert.strictEqual(config.API_BASE_URL, '/api/v1');
      assert.deepStrictEqual(config.MODULES, ['core', 'dummy']);
    });

    test('should use defaults when values are missing', () => {
      const appConfig = {
        name: 'TestApp'
      };

      initEnv(appConfig);

      const config = getConfigDict();
      assert.strictEqual(config.APP_NAME, 'TestApp');
      assert.strictEqual(config.APP_DISPLAY_NAME, 'TestApp'); // Falls back to name
      assert.strictEqual(config.BRAND_LOGO, '/favicon.svg'); // Default
      assert.strictEqual(config.UI_SHELL, 'EmptyShell'); // Default
      assert.strictEqual(config.STORAGE_BACKEND, 'localStorage'); // Default
      assert.strictEqual(config.API_BASE_URL, '/api'); // Default
      assert.deepStrictEqual(config.MODULES, []); // Default
    });
  });

  describe('getConfig', () => {
    beforeEach(() => {
      initEnv({
        name: 'TestApp',
        displayName: 'Test Display Name'
      });
    });

    test('should return config value from dictionary', async () => {
      const value = await getConfig(CONFIG_KEYS.APP_NAME);
      assert.strictEqual(value, 'TestApp');
    });

    test('should return altValue when key not found', async () => {
      // Note: getConfig checks import.meta.env which may not be available in Node
      // This test verifies the fallback behavior
      const value = await getConfig('NON_EXISTENT_KEY', 'default');
      assert.strictEqual(value, 'default');
    });

    test('should return null when key not found and no altValue', async () => {
      // Note: getConfig checks import.meta.env which may not be available in Node
      // This test verifies the fallback behavior
      const value = await getConfig('NON_EXISTENT_KEY');
      // May return null or undefined depending on import.meta.env availability
      assert.ok(value === null || value === undefined);
    });
  });

  describe('setConfig', () => {
    beforeEach(() => {
      initEnv({
        name: 'TestApp'
      });
    });

    test('should update existing config key in dictionary', async () => {
      await setConfig(CONFIG_KEYS.APP_NAME, 'UpdatedApp');
      const value = await getConfig(CONFIG_KEYS.APP_NAME);
      assert.strictEqual(value, 'UpdatedApp');
    });

    test('should handle new keys (may attempt storage)', async () => {
      // Since it's a new key, it should attempt to store in storage
      // We just verify it doesn't throw
      await assert.doesNotReject(async () => {
        await setConfig('custom.key', 'customValue');
      });
    });
  });

  describe('getConfigDict', () => {
    test('should return a copy of config dictionary', () => {
      initEnv({
        name: 'TestApp',
        displayName: 'Test Display'
      });

      const config1 = getConfigDict();
      const config2 = getConfigDict();

      // Should be equal but not the same object (copy)
      assert.deepStrictEqual(config1, config2);
      assert.notStrictEqual(config1, config2);
    });

    test('should return config with defaults when initialized with empty object', () => {
      initEnv({});
      const config = getConfigDict();
      // initEnv sets defaults even with empty object
      assert.ok('APP_NAME' in config);
      assert.ok('BRAND_LOGO' in config);
      assert.strictEqual(config.BRAND_LOGO, '/favicon.svg');
    });
  });

  describe('CONFIG_KEYS', () => {
    test('should export all expected config keys', () => {
      assert.ok('APP_NAME' in CONFIG_KEYS);
      assert.ok('APP_DISPLAY_NAME' in CONFIG_KEYS);
      assert.ok('BRAND_LOGO' in CONFIG_KEYS);
      assert.ok('UI_SHELL' in CONFIG_KEYS);
      assert.ok('STORAGE_BACKEND' in CONFIG_KEYS);
      assert.ok('API_BASE_URL' in CONFIG_KEYS);
      assert.ok('MODULES' in CONFIG_KEYS);
    });
  });

  describe('isDevelopment and isProduction', () => {
    test('should be functions', () => {
      assert.strictEqual(typeof isDevelopment, 'function');
      assert.strictEqual(typeof isProduction, 'function');
    });
  });
});