/**
 * Native Docker CLI Testing
 * Tests the OCI registry implementation using the actual Docker CLI
 */

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

const testQenv = new qenv.Qenv('./', './.nogit');

/**
 * Create a test registry with local token endpoint realm
 */
async function createDockerTestRegistry(port: number): Promise<SmartRegistry> {
  const s3AccessKey = await testQenv.getEnvVarOnDemand('S3_ACCESSKEY');
  const s3SecretKey = await testQenv.getEnvVarOnDemand('S3_SECRETKEY');
  const s3Endpoint = await testQenv.getEnvVarOnDemand('S3_ENDPOINT');
  const s3Port = await testQenv.getEnvVarOnDemand('S3_PORT');

  const config: IRegistryConfig = {
    storage: {
      accessKey: s3AccessKey || 'minioadmin',
      accessSecret: s3SecretKey || 'minioadmin',
      endpoint: s3Endpoint || 'localhost',
      port: parseInt(s3Port || '9000', 10),
      useSsl: false,
      region: 'us-east-1',
      bucketName: 'test-registry',
    },
    auth: {
      jwtSecret: 'test-secret-key',
      tokenStore: 'memory',
      npmTokens: {
        enabled: true,
      },
      ociTokens: {
        enabled: true,
        realm: `http://localhost:${port}/v2/token`,
        service: 'test-registry',
      },
    },
    oci: {
      enabled: true,
      basePath: '/oci',
    },
  };

  const reg = new SmartRegistry(config);
  await reg.init();
  return reg;
}

/**
 * Create test tokens for the registry
 */
async function createDockerTestTokens(reg: SmartRegistry) {
  const authManager = reg.getAuthManager();

  const userId = await authManager.authenticate({
    username: 'testuser',
    password: 'testpass',
  });

  if (!userId) {
    throw new Error('Failed to authenticate test user');
  }

  // Create OCI token with full access
  const ociToken = await authManager.createOciToken(
    userId,
    ['oci:repository:*:*'],
    3600
  );

  return { ociToken, userId };
}

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

/**
 * Create HTTP server wrapper around SmartRegistry
 * CRITICAL: Always passes rawBody for content-addressable operations (OCI manifests/blobs)
 *
 * Docker expects registry at /v2/ but SmartRegistry serves at /oci/v2/
 * This wrapper rewrites paths for Docker compatibility
 *
 * Also implements a simple /v2/token endpoint for Docker Bearer auth flow
 */
async function createHttpServer(
  registryInstance: SmartRegistry,
  port: number,
  tokenForAuth: string
): 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);
        let pathname = parsedUrl.pathname || '/';
        const query = parsedUrl.query;

        // Handle token endpoint for Docker Bearer auth
        if (pathname === '/v2/token' || pathname === '/token') {
          console.log(`[Token Request] ${req.method} ${req.url}`);
          res.statusCode = 200;
          res.setHeader('Content-Type', 'application/json');
          res.end(JSON.stringify({
            token: tokenForAuth,
            access_token: tokenForAuth,
            expires_in: 3600,
            issued_at: new Date().toISOString(),
          }));
          return;
        }

        // Log all requests for debugging
        console.log(`[Registry] ${req.method} ${pathname}`);

        // Docker expects /v2/ but SmartRegistry serves at /oci/v2/
        if (pathname.startsWith('/v2')) {
          pathname = '/oci' + pathname;
        }

        // Read raw body - ALWAYS preserve exact bytes for OCI
        const chunks: Buffer[] = [];
        for await (const chunk of req) {
          chunks.push(chunk);
        }
        const bodyBuffer = Buffer.concat(chunks);

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

        // Handle request
        const response: IResponse = await registryInstance.handleRequest(context);
        console.log(`[Registry] Response: ${response.status} for ${pathname}`);

        // 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, '0.0.0.0', () => {
      const serverUrl = `http://localhost:${port}`;
      resolve({ server: httpServer, url: serverUrl });
    });

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

/**
 * Create a test Dockerfile
 */
function createTestDockerfile(targetDir: string, content?: string): string {
  const dockerfilePath = path.join(targetDir, 'Dockerfile');
  const dockerfileContent = content || `FROM alpine:latest
RUN echo "Hello from SmartRegistry test" > /hello.txt
CMD ["cat", "/hello.txt"]
`;
  fs.writeFileSync(dockerfilePath, dockerfileContent, 'utf-8');
  return dockerfilePath;
}

/**
 * Run Docker command using the main Docker daemon (not rootless)
 * Rootless Docker runs in its own network namespace and can't access host localhost
 *
 * IMPORTANT: DOCKER_HOST env var overrides --context flag, so we must unset it
 * and explicitly set the socket path to use the main Docker daemon.
 */
async function runDockerCommand(
  command: string,
  cwd?: string
): Promise<{ stdout: string; stderr: string; exitCode: number }> {
  // First unset DOCKER_HOST then set it to main Docker daemon socket
  // Using both unset and export ensures we override any inherited env var
  const dockerCommand = `unset DOCKER_HOST && export DOCKER_HOST=unix:///var/run/docker.sock && ${command}`;
  const fullCommand = cwd ? `cd "${cwd}" && ${dockerCommand}` : dockerCommand;

  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 });
  }
}

/**
 * Cleanup Docker resources
 */
async function cleanupDocker(imageName: string): Promise<void> {
  await runDockerCommand(`docker rmi ${imageName} 2>/dev/null || true`);
  await runDockerCommand(`docker rmi ${imageName}:v1 2>/dev/null || true`);
  await runDockerCommand(`docker rmi ${imageName}:v2 2>/dev/null || true`);
}

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

tap.test('Docker CLI: should verify Docker is installed', async () => {
  const result = await runDockerCommand('docker version');
  console.log('Docker version output:', result.stdout.substring(0, 200));
  expect(result.exitCode).toEqual(0);
});

tap.test('Docker CLI: should setup registry and HTTP server', async () => {
  // Use localhost - Docker allows HTTP for localhost without any special config
  registryPort = 15000 + Math.floor(Math.random() * 1000);
  console.log(`Using port: ${registryPort}`);

  registry = await createDockerTestRegistry(registryPort);
  const tokens = await createDockerTestTokens(registry);
  ociToken = tokens.ociToken;

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

  const serverSetup = await createHttpServer(registry, registryPort, ociToken);
  server = serverSetup.server;
  registryUrl = serverSetup.url;

  expect(server).toBeDefined();
  console.log(`Registry server started at ${registryUrl}`);

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

  testImageName = `localhost:${registryPort}/test-image`;
});

tap.test('Docker CLI: should verify server is responding', async () => {
  // Give the server a moment to fully initialize
  await new Promise(resolve => setTimeout(resolve, 500));

  const response = await fetch(`${registryUrl}/oci/v2/`);
  expect(response.status).toEqual(200);
  console.log('OCI v2 response:', await response.json());
});

tap.test('Docker CLI: should login to registry', async () => {
  const result = await runDockerCommand(
    `echo "${ociToken}" | docker login localhost:${registryPort} -u testuser --password-stdin`
  );
  console.log('docker login output:', result.stdout);
  console.log('docker login stderr:', result.stderr);

  const combinedOutput = result.stdout + result.stderr;
  expect(combinedOutput).toContain('Login Succeeded');
});

tap.test('Docker CLI: should build test image', async () => {
  createTestDockerfile(testDir);

  const result = await runDockerCommand(
    `docker build -t ${testImageName}:v1 .`,
    testDir
  );
  console.log('docker build output:', result.stdout.substring(0, 500));

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

tap.test('Docker CLI: should push image to registry', async () => {
  // This is the critical test - if the digest mismatch bug is fixed,
  // this should succeed. The manifest bytes must be preserved exactly.
  const result = await runDockerCommand(`docker push ${testImageName}:v1`);
  console.log('docker push output:', result.stdout);
  console.log('docker push stderr:', result.stderr);

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

tap.test('Docker CLI: should verify manifest in registry via API', async () => {
  const response = await fetch(`${registryUrl}/oci/v2/test-image/tags/list`, {
    headers: { Authorization: `Bearer ${ociToken}` },
  });

  expect(response.status).toEqual(200);

  const tagList = await response.json();
  console.log('Tags list:', tagList);

  expect(tagList.name).toEqual('test-image');
  expect(tagList.tags).toContain('v1');
});

tap.test('Docker CLI: should pull pushed image', async () => {
  // First remove the local image
  await runDockerCommand(`docker rmi ${testImageName}:v1 || true`);

  const result = await runDockerCommand(`docker pull ${testImageName}:v1`);
  console.log('docker pull output:', result.stdout);

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

tap.test('Docker CLI: should run pulled image', async () => {
  const result = await runDockerCommand(`docker run --rm ${testImageName}:v1`);
  console.log('docker run output:', result.stdout);

  expect(result.exitCode).toEqual(0);
  expect(result.stdout).toContain('Hello from SmartRegistry test');
});

tap.postTask('cleanup docker cli tests', async () => {
  if (testImageName) {
    await cleanupDocker(testImageName);
  }

  if (server) {
    await new Promise<void>((resolve) => {
      server.close(() => resolve());
    });
  }

  if (testDir) {
    cleanupTestDir(testDir);
  }

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

export default tap.start();