import { getConfig } from '../../src/commands/config';
import { prepareFile } from './utils';

describe('getConfig', () => {
  const originalEnv = { ...process.env };
  let globalConfigFile: { filePath: string; cleanup: () => Promise<void> };
  let localEnvFile: { filePath: string; cleanup: () => Promise<void> };

  function resetEnv(env: NodeJS.ProcessEnv) {
    Object.keys(process.env).forEach((key) => {
      if (!(key in env)) {
        delete process.env[key];
      } else {
        process.env[key] = env[key];
      }
    });
  }

  beforeEach(async () => {
    resetEnv(originalEnv);
    if (globalConfigFile) await globalConfigFile.cleanup();
    if (localEnvFile) await localEnvFile.cleanup();
  });

  afterAll(() => {
    resetEnv(originalEnv);
  });

  const generateConfig = async (
    fileName: string,
    content: Record<string, string>
  ) => {
    const fileContent = Object.entries(content)
      .map(([key, value]) => `${key}="${value}"`)
      .join('\n');
    return await prepareFile(fileName, fileContent);
  };

  it('should prioritize local .env over global .opencommit config', async () => {
    globalConfigFile = await generateConfig('.opencommit', {
      OCO_OPENAI_API_KEY: 'global-key',
      OCO_MODEL: 'gpt-3.5-turbo',
      OCO_LANGUAGE: 'en'
    });

    localEnvFile = await generateConfig('.env', {
      OCO_OPENAI_API_KEY: 'local-key',
      OCO_ANTHROPIC_API_KEY: 'local-anthropic-key',
      OCO_LANGUAGE: 'fr'
    });

    const config = getConfig({
      configPath: globalConfigFile.filePath,
      envPath: localEnvFile.filePath
    });

    expect(config).not.toEqual(null);
    expect(config.OCO_OPENAI_API_KEY).toEqual('local-key');
    expect(config.OCO_MODEL).toEqual('gpt-3.5-turbo');
    expect(config.OCO_LANGUAGE).toEqual('fr');
    expect(config.OCO_ANTHROPIC_API_KEY).toEqual('local-anthropic-key');
  });

  it('should fallback to global config when local config is not set', async () => {
    globalConfigFile = await generateConfig('.opencommit', {
      OCO_OPENAI_API_KEY: 'global-key',
      OCO_MODEL: 'gpt-4',
      OCO_LANGUAGE: 'de',
      OCO_DESCRIPTION: 'true'
    });

    localEnvFile = await generateConfig('.env', {
      OCO_ANTHROPIC_API_KEY: 'local-anthropic-key'
    });

    const config = getConfig({
      configPath: globalConfigFile.filePath,
      envPath: localEnvFile.filePath
    });

    expect(config).not.toEqual(null);
    expect(config.OCO_OPENAI_API_KEY).toEqual('global-key');
    expect(config.OCO_ANTHROPIC_API_KEY).toEqual('local-anthropic-key');
    expect(config.OCO_MODEL).toEqual('gpt-4');
    expect(config.OCO_LANGUAGE).toEqual('de');
    expect(config.OCO_DESCRIPTION).toEqual(true);
  });

  it('should handle boolean and numeric values correctly', async () => {
    globalConfigFile = await generateConfig('.opencommit', {
      OCO_TOKENS_MAX_INPUT: '4096',
      OCO_TOKENS_MAX_OUTPUT: '500',
      OCO_GITPUSH: 'true'
    });

    localEnvFile = await generateConfig('.env', {
      OCO_TOKENS_MAX_INPUT: '8192',
      OCO_ONE_LINE_COMMIT: 'false'
    });

    const config = getConfig({
      configPath: globalConfigFile.filePath,
      envPath: localEnvFile.filePath
    });

    expect(config).not.toEqual(null);
    expect(config.OCO_TOKENS_MAX_INPUT).toEqual(8192);
    expect(config.OCO_TOKENS_MAX_OUTPUT).toEqual(500);
    expect(config.OCO_GITPUSH).toEqual(true);
    expect(config.OCO_ONE_LINE_COMMIT).toEqual(false);
  });

  it('should handle empty local config correctly', async () => {
    globalConfigFile = await generateConfig('.opencommit', {
      OCO_OPENAI_API_KEY: 'global-key',
      OCO_MODEL: 'gpt-4',
      OCO_LANGUAGE: 'es'
    });

    localEnvFile = await generateConfig('.env', {});

    const config = getConfig({
      configPath: globalConfigFile.filePath,
      envPath: localEnvFile.filePath
    });

    expect(config).not.toEqual(null);
    expect(config.OCO_OPENAI_API_KEY).toEqual('global-key');
    expect(config.OCO_MODEL).toEqual('gpt-4');
    expect(config.OCO_LANGUAGE).toEqual('es');
  });

  it('should override global config with null values in local .env', async () => {
    globalConfigFile = await generateConfig('.opencommit', {
      OCO_OPENAI_API_KEY: 'global-key',
      OCO_MODEL: 'gpt-4',
      OCO_LANGUAGE: 'es'
    });

    localEnvFile = await generateConfig('.env', { OCO_OPENAI_API_KEY: 'null' });

    const config = getConfig({
      configPath: globalConfigFile.filePath,
      envPath: localEnvFile.filePath
    });

    expect(config).not.toEqual(null);
    expect(config.OCO_OPENAI_API_KEY).toEqual(null);
  });
});