/**
 * Native npm CLI Testing
 * Tests the NPM registry implementation using the actual npm CLI
 */

import { expect, tap } from '@git.zone/tstest/tapbundle';
import { tapNodeTools } from '@git.zone/tstest/tapbundle_serverside';
import { SmartRegistry } from '../ts/index.js';
import { createTestRegistry, createTestTokens } from './helpers/registry.js';
import type { IRequestContext, IResponse } from '../ts/core/interfaces.core.js';
import * as http from 'http';
import * as url from 'url';
import * as fs from 'fs';
import * as path from 'path';

// Test context
let registry: SmartRegistry;
let server: http.Server;
let registryUrl: string;
let registryPort: number;
let npmToken: string;
let testDir: string;
let npmrcPath: string;

/**
 * Create HTTP server wrapper around SmartRegistry
 */
async function createHttpServer(
  registryInstance: SmartRegistry,
  port: number
): Promise<{ server: http.Server; url: string }> {
  return new Promise((resolve, reject) => {
    const httpServer = http.createServer(async (req, res) => {
      try {
        // Parse request
        const parsedUrl = url.parse(req.url || '', true);
        const pathname = parsedUrl.pathname || '/';
        const query = parsedUrl.query;

        // Read body
        const chunks: Buffer[] = [];
        for await (const chunk of req) {
          chunks.push(chunk);
        }
        const bodyBuffer = Buffer.concat(chunks);

        // Parse body based on content type
        let body: any;
        if (bodyBuffer.length > 0) {
          const contentType = req.headers['content-type'] || '';
          if (contentType.includes('application/json')) {
            try {
              body = JSON.parse(bodyBuffer.toString('utf-8'));
            } catch (error) {
              body = bodyBuffer;
            }
          } else {
            body = bodyBuffer;
          }
        }

        // Convert to IRequestContext
        const context: IRequestContext = {
          method: req.method || 'GET',
          path: pathname,
          headers: req.headers as Record<string, string>,
          query: query as Record<string, string>,
          body: body,
        };

        // Handle request
        const response: IResponse = await registryInstance.handleRequest(context);

        // Convert IResponse to HTTP response
        res.statusCode = response.status;

        // Set headers
        for (const [key, value] of Object.entries(response.headers || {})) {
          res.setHeader(key, value);
        }

        // Send body
        if (response.body) {
          if (Buffer.isBuffer(response.body)) {
            res.end(response.body);
          } else if (typeof response.body === 'string') {
            res.end(response.body);
          } else {
            res.setHeader('Content-Type', 'application/json');
            res.end(JSON.stringify(response.body));
          }
        } else {
          res.end();
        }
      } catch (error) {
        console.error('Server error:', error);
        res.statusCode = 500;
        res.setHeader('Content-Type', 'application/json');
        res.end(JSON.stringify({ error: 'INTERNAL_ERROR', message: String(error) }));
      }
    });

    httpServer.listen(port, () => {
      const serverUrl = `http://localhost:${port}`;
      resolve({ server: httpServer, url: serverUrl });
    });

    httpServer.on('error', reject);
  });
}

/**
 * Setup .npmrc configuration
 */
function setupNpmrc(registryUrlArg: string, token: string, testDirArg: string): string {
  const npmrcContent = `registry=${registryUrlArg}/npm/
//localhost:${registryPort}/npm/:_authToken=${token}
`;

  const npmrcFilePath = path.join(testDirArg, '.npmrc');
  fs.writeFileSync(npmrcFilePath, npmrcContent, 'utf-8');
  return npmrcFilePath;
}

/**
 * Create a test package
 */
function createTestPackage(
  packageName: string,
  version: string,
  targetDir: string
): string {
  const packageDir = path.join(targetDir, packageName);
  fs.mkdirSync(packageDir, { recursive: true });

  // Create package.json
  const packageJson = {
    name: packageName,
    version: version,
    description: `Test package ${packageName}`,
    main: 'index.js',
    scripts: {
      test: 'echo "Test passed"',
    },
    keywords: ['test'],
    author: 'Test Author',
    license: 'MIT',
  };

  fs.writeFileSync(
    path.join(packageDir, 'package.json'),
    JSON.stringify(packageJson, null, 2),
    'utf-8'
  );

  // Create index.js
  const indexJs = `module.exports = {
  name: '${packageName}',
  version: '${version}',
  message: 'Hello from ${packageName}@${version}'
};
`;

  fs.writeFileSync(path.join(packageDir, 'index.js'), indexJs, 'utf-8');

  // Create README.md
  const readme = `# ${packageName}

Test package for SmartRegistry.

Version: ${version}
`;

  fs.writeFileSync(path.join(packageDir, 'README.md'), readme, 'utf-8');

  return packageDir;
}

/**
 * Run npm command with proper environment
 */
async function runNpmCommand(
  command: string,
  cwd: string
): Promise<{ stdout: string; stderr: string; exitCode: number }> {
  // Prepare environment variables
  const envVars = [
    `NPM_CONFIG_USERCONFIG="${npmrcPath}"`,
    `NPM_CONFIG_CACHE="${path.join(testDir, '.npm-cache')}"`,
    `NPM_CONFIG_PREFIX="${path.join(testDir, '.npm-global')}"`,
    `NPM_CONFIG_REGISTRY="${registryUrl}/npm/"`,
  ].join(' ');

  // Build command with cd to correct directory and environment variables
  const fullCommand = `cd "${cwd}" && ${envVars} ${command}`;

  try {
    const result = await tapNodeTools.runCommand(fullCommand);
    return {
      stdout: result.stdout || '',
      stderr: result.stderr || '',
      exitCode: result.exitCode || 0,
    };
  } catch (error: any) {
    return {
      stdout: error.stdout || '',
      stderr: error.stderr || String(error),
      exitCode: error.exitCode || 1,
    };
  }
}

/**
 * Cleanup test directory
 */
function cleanupTestDir(dir: string): void {
  if (fs.existsSync(dir)) {
    fs.rmSync(dir, { recursive: true, force: true });
  }
}

// ========================================================================
// TESTS
// ========================================================================

tap.test('NPM CLI: should setup registry and HTTP server', async () => {
  // Create registry
  registry = await createTestRegistry();
  const tokens = await createTestTokens(registry);
  npmToken = tokens.npmToken;

  expect(registry).toBeInstanceOf(SmartRegistry);
  expect(npmToken).toBeTypeOf('string');

  // Find available port
  registryPort = 35000;
  const serverSetup = await createHttpServer(registry, registryPort);
  server = serverSetup.server;
  registryUrl = serverSetup.url;

  expect(server).toBeDefined();
  expect(registryUrl).toEqual(`http://localhost:${registryPort}`);

  // Setup test directory
  testDir = path.join(process.cwd(), '.nogit', 'test-npm-cli');
  cleanupTestDir(testDir);
  fs.mkdirSync(testDir, { recursive: true });

  // Setup .npmrc
  npmrcPath = setupNpmrc(registryUrl, npmToken, testDir);
  expect(fs.existsSync(npmrcPath)).toEqual(true);
});

tap.test('NPM CLI: should verify server is responding', async () => {
  const result = await runNpmCommand('npm ping', testDir);
  console.log('npm ping output:', result.stdout, result.stderr);

  // npm ping may not work with custom registries, so just check server is up
  // by doing a direct HTTP request
  const response = await fetch(`${registryUrl}/npm/`);
  expect(response.status).toBeGreaterThanOrEqual(200);
  expect(response.status).toBeLessThan(500);
});

tap.test('NPM CLI: should publish a package', async () => {
  const packageName = 'test-package-cli';
  const version = '1.0.0';
  const packageDir = createTestPackage(packageName, version, testDir);

  const result = await runNpmCommand('npm publish', packageDir);
  console.log('npm publish output:', result.stdout);
  console.log('npm publish stderr:', result.stderr);

  expect(result.exitCode).toEqual(0);
  expect(result.stdout || result.stderr).toContain(packageName);
});

tap.test('NPM CLI: should view published package', async () => {
  const packageName = 'test-package-cli';

  const result = await runNpmCommand(`npm view ${packageName}`, testDir);
  console.log('npm view output:', result.stdout);

  expect(result.exitCode).toEqual(0);
  expect(result.stdout).toContain(packageName);
  expect(result.stdout).toContain('1.0.0');
});

tap.test('NPM CLI: should install published package', async () => {
  const packageName = 'test-package-cli';
  const installDir = path.join(testDir, 'install-test');
  fs.mkdirSync(installDir, { recursive: true });

  // Create package.json for installation
  const packageJson = {
    name: 'install-test',
    version: '1.0.0',
    dependencies: {
      [packageName]: '1.0.0',
    },
  };

  fs.writeFileSync(
    path.join(installDir, 'package.json'),
    JSON.stringify(packageJson, null, 2),
    'utf-8'
  );

  const result = await runNpmCommand('npm install', installDir);
  console.log('npm install output:', result.stdout);
  console.log('npm install stderr:', result.stderr);

  expect(result.exitCode).toEqual(0);

  // Verify package was installed
  const nodeModulesPath = path.join(installDir, 'node_modules', packageName);
  expect(fs.existsSync(nodeModulesPath)).toEqual(true);
  expect(fs.existsSync(path.join(nodeModulesPath, 'package.json'))).toEqual(true);
  expect(fs.existsSync(path.join(nodeModulesPath, 'index.js'))).toEqual(true);

  // Verify package contents
  const installedPackageJson = JSON.parse(
    fs.readFileSync(path.join(nodeModulesPath, 'package.json'), 'utf-8')
  );
  expect(installedPackageJson.name).toEqual(packageName);
  expect(installedPackageJson.version).toEqual('1.0.0');
});

tap.test('NPM CLI: should publish second version', async () => {
  const packageName = 'test-package-cli';
  const version = '1.1.0';
  const packageDir = createTestPackage(packageName, version, testDir);

  const result = await runNpmCommand('npm publish', packageDir);
  console.log('npm publish v1.1.0 output:', result.stdout);

  expect(result.exitCode).toEqual(0);
});

tap.test('NPM CLI: should list versions', async () => {
  const packageName = 'test-package-cli';

  const result = await runNpmCommand(`npm view ${packageName} versions`, testDir);
  console.log('npm view versions output:', result.stdout);

  expect(result.exitCode).toEqual(0);
  expect(result.stdout).toContain('1.0.0');
  expect(result.stdout).toContain('1.1.0');
});

tap.test('NPM CLI: should publish scoped package', async () => {
  const packageName = '@testscope/scoped-package';
  const version = '1.0.0';
  const packageDir = createTestPackage(packageName, version, testDir);

  const result = await runNpmCommand('npm publish --access public', packageDir);
  console.log('npm publish scoped output:', result.stdout);
  console.log('npm publish scoped stderr:', result.stderr);

  expect(result.exitCode).toEqual(0);
});

tap.test('NPM CLI: should view scoped package', async () => {
  const packageName = '@testscope/scoped-package';

  const result = await runNpmCommand(`npm view ${packageName}`, testDir);
  console.log('npm view scoped output:', result.stdout);

  expect(result.exitCode).toEqual(0);
  expect(result.stdout).toContain('scoped-package');
});

tap.test('NPM CLI: should fail to publish without auth', async () => {
  const packageName = 'unauth-package';
  const version = '1.0.0';
  const packageDir = createTestPackage(packageName, version, testDir);

  // Temporarily remove .npmrc
  const npmrcBackup = fs.readFileSync(npmrcPath, 'utf-8');
  fs.writeFileSync(npmrcPath, 'registry=' + registryUrl + '/npm/\n', 'utf-8');

  const result = await runNpmCommand('npm publish', packageDir);
  console.log('npm publish unauth output:', result.stdout);
  console.log('npm publish unauth stderr:', result.stderr);

  // Restore .npmrc
  fs.writeFileSync(npmrcPath, npmrcBackup, 'utf-8');

  // Should fail with auth error
  expect(result.exitCode).not.toEqual(0);
});

tap.postTask('cleanup npm cli tests', async () => {
  // Stop server
  if (server) {
    await new Promise<void>((resolve) => {
      server.close(() => resolve());
    });
  }

  // Cleanup test directory
  if (testDir) {
    cleanupTestDir(testDir);
  }

  // Destroy registry
  if (registry) {
    registry.destroy();
  }
});

export default tap.start();