import * as fs from 'fs';
import * as crypto from 'crypto';
import * as os from 'os';
import * as path from 'path';
import { tap, expect } from '@git.zone/tstest/tapbundle';
import {
  BaseImageManager,
  VMConfig,
  SocketClient,
  NetworkManager,
  MicroVM,
  SmartVM,
  SmartVMError,
} from '../ts/index.js';
import type { IBaseImageBundle, IBaseImageHostedManifest, IMicroVMConfig } from '../ts/index.js';

async function getRejectedError(promise: Promise<unknown>): Promise<unknown> {
  try {
    await promise;
  } catch (err) {
    return err;
  }
  return undefined;
}

function sha256Buffer(buffer: Buffer): string {
  return crypto.createHash('sha256').update(buffer).digest('hex');
}

// ============================================================
// VMConfig Tests
// ============================================================

const sampleConfig: IMicroVMConfig = {
  id: 'test-vm-1',
  bootSource: {
    kernelImagePath: '/path/to/vmlinux',
    bootArgs: 'console=ttyS0 reboot=k panic=1',
  },
  machineConfig: {
    vcpuCount: 2,
    memSizeMib: 256,
    smt: false,
  },
  drives: [
    {
      driveId: 'rootfs',
      pathOnHost: '/path/to/rootfs.ext4',
      isRootDevice: true,
      isReadOnly: false,
      cacheType: 'Unsafe',
    },
  ],
  networkInterfaces: [
    {
      ifaceId: 'eth0',
      hostDevName: 'tap0',
      guestMac: '02:00:00:00:00:01',
    },
  ],
};

tap.test('VMConfig - validate() should pass for valid config', async () => {
  const vmConfig = new VMConfig(sampleConfig);
  const result = vmConfig.validate();
  expect(result.valid).toBeTrue();
  expect(result.errors).toHaveLength(0);
});

tap.test('VMConfig - validate() should fail for missing bootSource', async () => {
  const vmConfig = new VMConfig({
    machineConfig: { vcpuCount: 1, memSizeMib: 128 },
  } as any);
  const result = vmConfig.validate();
  expect(result.valid).toBeFalse();
  expect(result.errors.length).toBeGreaterThan(0);
});

tap.test('VMConfig - validate() should fail for invalid vcpuCount', async () => {
  const vmConfig = new VMConfig({
    bootSource: { kernelImagePath: '/vmlinux' },
    machineConfig: { vcpuCount: 0, memSizeMib: 128 },
  });
  const result = vmConfig.validate();
  expect(result.valid).toBeFalse();
});

tap.test('VMConfig - validate() should fail for vcpuCount > 32', async () => {
  const vmConfig = new VMConfig({
    bootSource: { kernelImagePath: '/vmlinux' },
    machineConfig: { vcpuCount: 64, memSizeMib: 128 },
  });
  const result = vmConfig.validate();
  expect(result.valid).toBeFalse();
});

tap.test('VMConfig - validate() should fail for multiple root drives', async () => {
  const vmConfig = new VMConfig({
    bootSource: { kernelImagePath: '/vmlinux' },
    machineConfig: { vcpuCount: 1, memSizeMib: 128 },
    drives: [
      { driveId: 'rootfs1', pathOnHost: '/rootfs1', isRootDevice: true },
      { driveId: 'rootfs2', pathOnHost: '/rootfs2', isRootDevice: true },
    ],
  });
  const result = vmConfig.validate();
  expect(result.valid).toBeFalse();
});

tap.test('VMConfig - validate() should fail for invalid vsock guestCid', async () => {
  const vmConfig = new VMConfig({
    bootSource: { kernelImagePath: '/vmlinux' },
    machineConfig: { vcpuCount: 1, memSizeMib: 128 },
    vsock: { guestCid: 2, udsPath: '/tmp/vsock.sock' },
  });
  const result = vmConfig.validate();
  expect(result.valid).toBeFalse();
  expect(result.errors).toContain('vsock.guestCid must be >= 3');
});

tap.test('VMConfig - constructor should not retain caller references', async () => {
  const config: IMicroVMConfig = {
    ...sampleConfig,
    networkInterfaces: [{ ifaceId: 'eth0', guestMac: '02:00:00:00:00:01' }],
    mmds: { version: 'V2', networkInterfaces: ['eth0'] },
  };
  const vmConfig = new VMConfig(config);

  config.networkInterfaces![0].guestMac = '02:00:00:00:00:02';
  config.mmds!.networkInterfaces.push('eth1');

  expect(vmConfig.toNetworkInterfacePayload(vmConfig.config.networkInterfaces![0]).guest_mac)
    .toEqual('02:00:00:00:00:01');
  expect(vmConfig.toMmdsConfigPayload()!.network_interfaces).toEqual(['eth0']);
});

tap.test('VMConfig - toBootSourcePayload() should generate correct snake_case', async () => {
  const vmConfig = new VMConfig(sampleConfig);
  const payload = vmConfig.toBootSourcePayload();
  expect(payload.kernel_image_path).toEqual('/path/to/vmlinux');
  expect(payload.boot_args).toEqual('console=ttyS0 reboot=k panic=1');
  expect(payload.initrd_path).toBeUndefined();
});

tap.test('VMConfig - toMachineConfigPayload() should generate correct payload', async () => {
  const vmConfig = new VMConfig(sampleConfig);
  const payload = vmConfig.toMachineConfigPayload();
  expect(payload.vcpu_count).toEqual(2);
  expect(payload.mem_size_mib).toEqual(256);
  expect(payload.smt).toEqual(false);
});

tap.test('VMConfig - toDrivePayload() should generate correct payload', async () => {
  const vmConfig = new VMConfig(sampleConfig);
  const payload = vmConfig.toDrivePayload(sampleConfig.drives![0]);
  expect(payload.drive_id).toEqual('rootfs');
  expect(payload.path_on_host).toEqual('/path/to/rootfs.ext4');
  expect(payload.is_root_device).toEqual(true);
  expect(payload.is_read_only).toEqual(false);
  expect(payload.cache_type).toEqual('Unsafe');
});

tap.test('VMConfig - toNetworkInterfacePayload() should generate correct payload', async () => {
  const vmConfig = new VMConfig(sampleConfig);
  const payload = vmConfig.toNetworkInterfacePayload(sampleConfig.networkInterfaces![0]);
  expect(payload.iface_id).toEqual('eth0');
  expect(payload.host_dev_name).toEqual('tap0');
  expect(payload.guest_mac).toEqual('02:00:00:00:00:01');
});

tap.test('VMConfig - toVsockPayload() should return null when no vsock configured', async () => {
  const vmConfig = new VMConfig(sampleConfig);
  expect(vmConfig.toVsockPayload()).toBeNull();
});

tap.test('VMConfig - toBalloonPayload() should return null when no balloon configured', async () => {
  const vmConfig = new VMConfig(sampleConfig);
  expect(vmConfig.toBalloonPayload()).toBeNull();
});

tap.test('VMConfig - toBalloonPayload() should generate correct payload', async () => {
  const config: IMicroVMConfig = {
    ...sampleConfig,
    balloon: { amountMib: 64, deflateOnOom: true, statsPollingIntervalS: 5 },
  };
  const vmConfig = new VMConfig(config);
  const payload = vmConfig.toBalloonPayload();
  expect(payload).not.toBeNull();
  expect(payload!.amount_mib).toEqual(64);
  expect(payload!.deflate_on_oom).toEqual(true);
  expect(payload!.stats_polling_interval_s).toEqual(5);
});

tap.test('VMConfig - toVsockPayload() should generate correct payload', async () => {
  const config: IMicroVMConfig = {
    ...sampleConfig,
    vsock: { guestCid: 3, udsPath: '/tmp/vsock.sock' },
  };
  const vmConfig = new VMConfig(config);
  const payload = vmConfig.toVsockPayload();
  expect(payload).not.toBeNull();
  expect(payload!.guest_cid).toEqual(3);
  expect(payload!.uds_path).toEqual('/tmp/vsock.sock');
});

tap.test('VMConfig - toMmdsConfigPayload() should generate correct payload', async () => {
  const config: IMicroVMConfig = {
    ...sampleConfig,
    mmds: { version: 'V2', networkInterfaces: ['eth0'] },
  };
  const vmConfig = new VMConfig(config);
  const payload = vmConfig.toMmdsConfigPayload();
  expect(payload).not.toBeNull();
  expect(payload!.version).toEqual('V2');
  expect(payload!.network_interfaces).toEqual(['eth0']);
});

tap.test('VMConfig - toMetricsPayload() should generate correct payload', async () => {
  const config: IMicroVMConfig = {
    ...sampleConfig,
    metrics: { metricsPath: '/tmp/firecracker-metrics.fifo' },
  };
  const vmConfig = new VMConfig(config);
  const payload = vmConfig.toMetricsPayload();
  expect(payload).not.toBeNull();
  expect(payload!.metrics_path).toEqual('/tmp/firecracker-metrics.fifo');
});

tap.test('VMConfig - toDrivePayload() should include rate limiter payloads', async () => {
  const vmConfig = new VMConfig(sampleConfig);
  const payload = vmConfig.toDrivePayload({
    driveId: 'data',
    pathOnHost: '/path/to/data.ext4',
    isRootDevice: false,
    rateLimiter: {
      bandwidth: { size: 1000, refillTime: 2000, oneTimeBurst: 3000 },
      ops: { size: 10, refillTime: 20, oneTimeBurst: 30 },
    },
  });

  expect(payload.rate_limiter.bandwidth).toEqual({
    size: 1000,
    refill_time: 2000,
    one_time_burst: 3000,
  });
  expect(payload.rate_limiter.ops).toEqual({
    size: 10,
    refill_time: 20,
    one_time_burst: 30,
  });
});

tap.test('VMConfig - toLoggerPayload() should generate correct payload', async () => {
  const config: IMicroVMConfig = {
    ...sampleConfig,
    logger: { logPath: '/tmp/fc.log', level: 'Debug', showLogOrigin: true },
  };
  const vmConfig = new VMConfig(config);
  const payload = vmConfig.toLoggerPayload();
  expect(payload).not.toBeNull();
  expect(payload!.log_path).toEqual('/tmp/fc.log');
  expect(payload!.level).toEqual('Debug');
  expect(payload!.show_log_origin).toEqual(true);
});

// ============================================================
// SocketClient Tests
// ============================================================

tap.test('SocketClient - URL construction', async () => {
  const client = new SocketClient({ socketPath: '/tmp/test.sock' });
  // We can't directly access buildUrl, but we can verify the client instantiates
  expect(client).toBeTruthy();
});

// ============================================================
// BaseImageManager Tests
// ============================================================

tap.test('BaseImageManager - instantiation with defaults', async () => {
  const manager = new BaseImageManager();
  expect(manager.getCacheDir()).toEqual(path.join(os.tmpdir(), '.smartvm', 'base-images'));
  expect(manager.getMaxStoredBaseImages()).toEqual(2);
});

tap.test('BaseImageManager - rejects invalid maxStoredBaseImages', async () => {
  let error: unknown;
  try {
    new BaseImageManager({ maxStoredBaseImages: 0 });
  } catch (err) {
    error = err;
  }

  expect(error).toBeInstanceOf(SmartVMError);
  expect((error as SmartVMError).code).toEqual('INVALID_BASE_IMAGE_CACHE_LIMIT');
});

tap.test('BaseImageManager - pruneBaseImageCache() should evict old bundles', async () => {
  const cacheDir = await fs.promises.mkdtemp(path.join(os.tmpdir(), 'smartvm-base-image-test-'));
  const manager = new BaseImageManager({ cacheDir, maxStoredBaseImages: 2 });
  const originalWarn = console.warn;
  const warnings: string[] = [];
  console.warn = (message?: any) => {
    warnings.push(String(message));
  };

  const createManifest = async (bundleId: string, lastAccessedAt: string) => {
    const bundleDir = path.join(cacheDir, bundleId);
    await fs.promises.mkdir(bundleDir, { recursive: true });
    const bundle: IBaseImageBundle = {
      preset: 'lts',
      arch: 'x86_64',
      ciVersion: 'v1.7',
      firecrackerVersion: 'v1.7.0',
      bundleId,
      bundleDir,
      kernelImagePath: path.join(bundleDir, 'vmlinux'),
      rootfsPath: path.join(bundleDir, 'rootfs.ext4'),
      rootfsType: 'ext4',
      rootfsIsReadOnly: false,
      bootArgs: 'console=ttyS0 reboot=k panic=1 pci=off',
      source: {
        bucketUrl: 'https://s3.amazonaws.com/spec.ccfc.min',
        kernelKey: 'kernel',
        rootfsKey: 'rootfs',
      },
      createdAt: lastAccessedAt,
      lastAccessedAt,
    };
    await fs.promises.writeFile(path.join(bundleDir, 'manifest.json'), `${JSON.stringify(bundle, null, 2)}\n`);
  };

  try {
    await createManifest('old', '2024-01-01T00:00:00.000Z');
    await createManifest('middle', '2024-01-02T00:00:00.000Z');
    await createManifest('new', '2024-01-03T00:00:00.000Z');

    const evicted = await manager.pruneBaseImageCache('new');
    expect(evicted).toEqual(['old']);
    expect(warnings.length).toEqual(1);
    expect(warnings[0]).toInclude('Evicting old');
    expect(fs.existsSync(path.join(cacheDir, 'old'))).toBeFalse();
    expect(fs.existsSync(path.join(cacheDir, 'middle'))).toBeTrue();
    expect(fs.existsSync(path.join(cacheDir, 'new'))).toBeTrue();
  } finally {
    console.warn = originalWarn;
    await fs.promises.rm(cacheDir, { recursive: true, force: true });
  }
});

tap.test('BaseImageManager - ensureBaseImage() should copy hosted manifest artifacts', async () => {
  const workDir = await fs.promises.mkdtemp(path.join(os.tmpdir(), 'smartvm-hosted-image-test-'));
  const cacheDir = path.join(workDir, 'cache');
  const assetsDir = path.join(workDir, 'assets');
  await fs.promises.mkdir(assetsDir, { recursive: true });

  const kernelBuffer = Buffer.from('fake-kernel');
  const rootfsBuffer = Buffer.from('fake-rootfs');
  const kernelPath = path.join(assetsDir, 'vmlinux-test');
  const rootfsPath = path.join(assetsDir, 'rootfs-test.ext4');
  await fs.promises.writeFile(kernelPath, kernelBuffer);
  await fs.promises.writeFile(rootfsPath, rootfsBuffer);

  const manifest: IBaseImageHostedManifest = {
    schemaVersion: 1,
    bundleId: 'smartvm-minimal-test',
    name: 'SmartVM minimal test bundle',
    arch: 'x86_64',
    firecrackerVersion: 'v1.15.1',
    rootfsType: 'ext4',
    rootfsIsReadOnly: false,
    bootArgs: 'console=ttyS0 reboot=k panic=1 pci=off',
    kernel: {
      path: kernelPath,
      fileName: 'vmlinux',
      sha256: sha256Buffer(kernelBuffer),
      sizeBytes: kernelBuffer.length,
    },
    rootfs: {
      path: rootfsPath,
      fileName: 'rootfs.ext4',
      sha256: sha256Buffer(rootfsBuffer),
      sizeBytes: rootfsBuffer.length,
    },
  };
  const manifestPath = path.join(workDir, 'manifest.json');
  await fs.promises.writeFile(manifestPath, `${JSON.stringify(manifest, null, 2)}\n`);

  try {
    const manager = new BaseImageManager({ cacheDir });
    const bundle = await manager.ensureBaseImage({ manifestPath });

    expect(bundle.preset).toEqual('hosted');
    expect(bundle.bundleId).toEqual('smartvm-minimal-test');
    expect(bundle.firecrackerVersion).toEqual('v1.15.1');
    expect(bundle.source.type).toEqual('hosted-manifest');
    expect(bundle.source.manifestPath).toEqual(manifestPath);
    expect(fs.existsSync(bundle.kernelImagePath)).toBeTrue();
    expect(fs.existsSync(bundle.rootfsPath)).toBeTrue();
    expect(bundle.checksums!.kernelSha256).toEqual(sha256Buffer(kernelBuffer));
    expect(bundle.checksums!.rootfsSha256).toEqual(sha256Buffer(rootfsBuffer));
  } finally {
    await fs.promises.rm(workDir, { recursive: true, force: true });
  }
});

tap.test('BaseImageManager - ensureBaseImage() should redownload corrupted cached artifacts', async () => {
  const workDir = await fs.promises.mkdtemp(path.join(os.tmpdir(), 'smartvm-hosted-image-cache-test-'));
  const cacheDir = path.join(workDir, 'cache');
  const assetsDir = path.join(workDir, 'assets');
  await fs.promises.mkdir(assetsDir, { recursive: true });

  const kernelBuffer = Buffer.from('fresh-kernel');
  const rootfsBuffer = Buffer.from('fresh-rootfs');
  const kernelPath = path.join(assetsDir, 'vmlinux-test');
  const rootfsPath = path.join(assetsDir, 'rootfs-test.ext4');
  await fs.promises.writeFile(kernelPath, kernelBuffer);
  await fs.promises.writeFile(rootfsPath, rootfsBuffer);

  const manifest: IBaseImageHostedManifest = {
    schemaVersion: 1,
    bundleId: 'smartvm-corruption-test',
    arch: 'x86_64',
    firecrackerVersion: 'v1.15.1',
    rootfsType: 'ext4',
    kernel: {
      path: kernelPath,
      fileName: 'vmlinux',
      sha256: sha256Buffer(kernelBuffer),
      sizeBytes: kernelBuffer.length,
    },
    rootfs: {
      path: rootfsPath,
      fileName: 'rootfs.ext4',
      sha256: sha256Buffer(rootfsBuffer),
      sizeBytes: rootfsBuffer.length,
    },
  };
  const manifestPath = path.join(workDir, 'manifest.json');
  await fs.promises.writeFile(manifestPath, `${JSON.stringify(manifest, null, 2)}\n`);

  try {
    const manager = new BaseImageManager({ cacheDir });
    const firstBundle = await manager.ensureBaseImage({ manifestPath });
    await fs.promises.writeFile(firstBundle.kernelImagePath, 'tampered-kernel');

    const secondBundle = await manager.ensureBaseImage({ manifestPath });
    expect(await fs.promises.readFile(secondBundle.kernelImagePath, 'utf8')).toEqual('fresh-kernel');
    expect(secondBundle.checksums!.kernelSha256).toEqual(sha256Buffer(kernelBuffer));
  } finally {
    await fs.promises.rm(workDir, { recursive: true, force: true });
  }
});

tap.test('BaseImageManager - ensureBaseImage() should reject hosted manifest arch mismatch', async () => {
  const workDir = await fs.promises.mkdtemp(path.join(os.tmpdir(), 'smartvm-hosted-image-invalid-test-'));
  const manifestPath = path.join(workDir, 'manifest.json');
  const manifest: IBaseImageHostedManifest = {
    schemaVersion: 1,
    bundleId: 'smartvm-invalid-arch-test',
    arch: 'aarch64',
    firecrackerVersion: 'v1.15.1',
    rootfsType: 'ext4',
    kernel: { path: path.join(workDir, 'vmlinux') },
    rootfs: { path: path.join(workDir, 'rootfs.ext4') },
  };
  await fs.promises.writeFile(manifestPath, `${JSON.stringify(manifest, null, 2)}\n`);

  try {
    const manager = new BaseImageManager({ cacheDir: path.join(workDir, 'cache'), arch: 'x86_64' });
    const error = await getRejectedError(manager.ensureBaseImage({ manifestPath }));
    expect(error).toBeInstanceOf(SmartVMError);
    expect((error as SmartVMError).code).toEqual('INVALID_BASE_IMAGE_MANIFEST');
  } finally {
    await fs.promises.rm(workDir, { recursive: true, force: true });
  }
});

tap.test('BaseImageManager - ensureBaseImage() should reject hosted manifest fileName traversal', async () => {
  const workDir = await fs.promises.mkdtemp(path.join(os.tmpdir(), 'smartvm-hosted-image-filename-test-'));
  const manifestPath = path.join(workDir, 'manifest.json');
  const manifest: IBaseImageHostedManifest = {
    schemaVersion: 1,
    bundleId: 'smartvm-invalid-filename-test',
    arch: 'x86_64',
    firecrackerVersion: 'v1.15.1',
    rootfsType: 'ext4',
    kernel: { path: path.join(workDir, 'vmlinux'), fileName: '../vmlinux' },
    rootfs: { path: path.join(workDir, 'rootfs.ext4'), fileName: 'rootfs.ext4' },
  };
  await fs.promises.writeFile(manifestPath, `${JSON.stringify(manifest, null, 2)}\n`);

  try {
    const manager = new BaseImageManager({ cacheDir: path.join(workDir, 'cache') });
    const error = await getRejectedError(manager.ensureBaseImage({ manifestPath }));
    expect(error).toBeInstanceOf(SmartVMError);
    expect((error as SmartVMError).code).toEqual('INVALID_BASE_IMAGE_MANIFEST');
  } finally {
    await fs.promises.rm(workDir, { recursive: true, force: true });
  }
});

tap.test('BaseImageManager - ensureBaseImage() should reject hosted URL artifacts without sha256', async () => {
  const workDir = await fs.promises.mkdtemp(path.join(os.tmpdir(), 'smartvm-hosted-image-url-test-'));
  const manifestPath = path.join(workDir, 'manifest.json');
  const manifest: IBaseImageHostedManifest = {
    schemaVersion: 1,
    bundleId: 'smartvm-invalid-url-test',
    arch: 'x86_64',
    firecrackerVersion: 'v1.15.1',
    rootfsType: 'ext4',
    kernel: { url: 'https://example.com/vmlinux' },
    rootfs: { path: path.join(workDir, 'rootfs.ext4') },
  };
  await fs.promises.writeFile(manifestPath, `${JSON.stringify(manifest, null, 2)}\n`);

  try {
    const manager = new BaseImageManager({ cacheDir: path.join(workDir, 'cache') });
    const error = await getRejectedError(manager.ensureBaseImage({ manifestPath }));
    expect(error).toBeInstanceOf(SmartVMError);
    expect((error as SmartVMError).code).toEqual('INVALID_BASE_IMAGE_MANIFEST');
  } finally {
    await fs.promises.rm(workDir, { recursive: true, force: true });
  }
});

tap.test('BaseImageManager - hosted preset should require a manifest', async () => {
  const workDir = await fs.promises.mkdtemp(path.join(os.tmpdir(), 'smartvm-hosted-image-missing-test-'));
  try {
    const manager = new BaseImageManager({ cacheDir: path.join(workDir, 'cache') });
    const error = await getRejectedError(manager.ensureBaseImage({ preset: 'hosted' }));
    expect(error).toBeInstanceOf(SmartVMError);
    expect((error as SmartVMError).code).toEqual('BASE_IMAGE_MANIFEST_FAILED');
  } finally {
    await fs.promises.rm(workDir, { recursive: true, force: true });
  }
});

// ============================================================
// NetworkManager Tests
// ============================================================

tap.test('NetworkManager - allocateIp() should allocate sequential IPs', async () => {
  const nm = new NetworkManager({ subnet: '172.30.0.0/24' });
  const ip1 = nm.allocateIp();
  const ip2 = nm.allocateIp();
  const ip3 = nm.allocateIp();
  expect(ip1).toEqual('172.30.0.2');
  expect(ip2).toEqual('172.30.0.3');
  expect(ip3).toEqual('172.30.0.4');
});

tap.test('NetworkManager - allocateIp() should normalize non-network CIDR input', async () => {
  const nm = new NetworkManager({ subnet: '10.20.30.17/29' });
  expect(nm.allocateIp()).toEqual('10.20.30.18');
  expect(nm.allocateIp()).toEqual('10.20.30.19');
});

tap.test('NetworkManager - allocateIp() should fail when subnet is exhausted', async () => {
  const nm = new NetworkManager({ subnet: '192.168.100.0/30' });
  expect(nm.allocateIp()).toEqual('192.168.100.2');

  let error: unknown;
  try {
    nm.allocateIp();
  } catch (err) {
    error = err;
  }

  expect(error).toBeInstanceOf(SmartVMError);
  expect((error as SmartVMError).code).toEqual('IP_EXHAUSTED');
});

tap.test('NetworkManager - constructor should reject invalid subnet input', async () => {
  let error: unknown;
  try {
    new NetworkManager({ subnet: '10.0.0.0/31' });
  } catch (err) {
    error = err;
  }

  expect(error).toBeInstanceOf(SmartVMError);
  expect((error as SmartVMError).code).toEqual('INVALID_SUBNET');
});

tap.test('NetworkManager - constructor should reject malformed IPv4 octets', async () => {
  for (const subnet of ['10..0.1/24', '10.0x10.0.1/24', '10.0.0.1 /24']) {
    let error: unknown;
    try {
      new NetworkManager({ subnet });
    } catch (err) {
      error = err;
    }

    expect(error).toBeInstanceOf(SmartVMError);
    expect((error as SmartVMError).code).toEqual('INVALID_SUBNET');
  }
});

tap.test('NetworkManager - constructor should reject invalid bridge names', async () => {
  let error: unknown;
  try {
    new NetworkManager({ bridgeName: 'bad bridge' });
  } catch (err) {
    error = err;
  }

  expect(error).toBeInstanceOf(SmartVMError);
  expect((error as SmartVMError).code).toEqual('INVALID_INTERFACE_NAME');
});

tap.test('NetworkManager - generateMac() should generate locally-administered MACs', async () => {
  const nm = new NetworkManager();
  const mac1 = nm.generateMac('vm1', 'eth0');
  const mac2 = nm.generateMac('vm2', 'eth0');
  const mac3 = nm.generateMac('vm1', 'eth0');

  // Should start with 02: (locally administered)
  expect(mac1.startsWith('02:')).toBeTrue();
  expect(mac2.startsWith('02:')).toBeTrue();

  // Same inputs should produce same MAC (deterministic)
  expect(mac1).toEqual(mac3);

  // Different inputs should produce different MACs
  expect(mac1).not.toEqual(mac2);

  // Should be valid MAC format (6 hex pairs separated by colons)
  expect(mac1).toMatch(/^([0-9a-f]{2}:){5}[0-9a-f]{2}$/);
});

tap.test('NetworkManager - generateTapName() should respect IFNAMSIZ limit', async () => {
  const nm = new NetworkManager();
  const name1 = nm.generateTapName('abcdefgh-1234-5678', 'eth0');
  const name2 = nm.generateTapName('short', 'eth0');

  // Should not exceed 15 characters
  expect(name1.length).toBeLessThanOrEqual(15);
  expect(name2.length).toBeLessThanOrEqual(15);

  // Should start with 'sv' prefix
  expect(name1.startsWith('sv')).toBeTrue();
  expect(name2.startsWith('sv')).toBeTrue();
});

tap.test('NetworkManager - getGuestNetworkBootArgs() should format correctly', async () => {
  const nm = new NetworkManager();
  const tap = {
    tapName: 'svtest0eth0',
    guestIp: '172.30.0.2',
    gatewayIp: '172.30.0.1',
    subnetMask: '255.255.255.0',
    mac: '02:00:00:00:00:01',
  };
  const bootArgs = nm.getGuestNetworkBootArgs(tap);
  expect(bootArgs).toEqual('ip=172.30.0.2::172.30.0.1:255.255.255.0::eth0:off');
});

// ============================================================
// MicroVM Tests
// ============================================================

tap.test('MicroVM - invalid lifecycle calls should throw SmartVMError', async () => {
  const vm = new MicroVM(
    'lifecycle-vm',
    sampleConfig,
    '/bin/false',
    '/tmp/smartvm-lifecycle.sock',
    new NetworkManager(),
  );

  const pauseError = await getRejectedError(vm.pause());
  expect(pauseError).toBeInstanceOf(SmartVMError);
  expect((pauseError as SmartVMError).code).toEqual('INVALID_STATE');

  const infoError = await getRejectedError(vm.getInfo());
  expect(infoError).toBeInstanceOf(SmartVMError);
  expect((infoError as SmartVMError).code).toEqual('NO_CLIENT');
});

// ============================================================
// SmartVM Tests
// ============================================================

tap.test('SmartVM - instantiation with defaults', async () => {
  const smartvm = new SmartVM();
  expect(smartvm).toBeTruthy();
  expect(smartvm.imageManager).toBeTruthy();
  expect(smartvm.baseImageManager).toBeTruthy();
  expect(smartvm.networkManager).toBeTruthy();
  expect(smartvm.vmCount).toEqual(0);
  expect(smartvm.listVMs()).toHaveLength(0);
});

tap.test('SmartVM - instantiation with custom options', async () => {
  const smartvm = new SmartVM({
    dataDir: '/tmp/smartvm-test',
    arch: 'aarch64',
    bridgeName: 'testbr0',
    subnet: '10.0.0.0/24',
  });
  expect(smartvm).toBeTruthy();
});

tap.test('SmartVM - createVM() should track created VMs', async () => {
  const smartvm = new SmartVM({
    dataDir: '/tmp/smartvm-test',
    firecrackerBinaryPath: '/bin/false',
  });
  const vm = await smartvm.createVM(sampleConfig);

  expect(smartvm.vmCount).toEqual(1);
  expect(smartvm.getVM(vm.id)).toEqual(vm);
  expect(smartvm.listVMs()).toEqual([vm.id]);

  await smartvm.cleanup();
  expect(smartvm.vmCount).toEqual(0);
});

export default tap.start();