import { tap, expect } from '@git.zone/tstest/tapbundle';
import {
  VMConfig,
  SocketClient,
  NetworkManager,
  SmartVM,
} from '../ts/index.js';
import type { IMicroVMConfig } from '../ts/index.js';

// ============================================================
// 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 - 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 - 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();
});

// ============================================================
// 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 - 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');
});

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

tap.test('SmartVM - instantiation with defaults', async () => {
  const smartvm = new SmartVM();
  expect(smartvm).toBeTruthy();
  expect(smartvm.imageManager).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();
});

export default tap.start();