import { expect, tap } from '@git.zone/tstest/tapbundle';
import { DcRouter } from '../ts/classes.dcrouter.js';
import { VpnManager } from '../ts/vpn/classes.vpn-manager.js';

tap.test('VpnManager downgrades back to socket mode when no host-IP clients remain', async () => {
  const manager = new VpnManager({ forwardingMode: 'socket' });

  let stopCalls = 0;
  let startCalls = 0;

  (manager as any).vpnServer = { running: true };
  (manager as any).resolvedForwardingMode = 'hybrid';
  (manager as any).clients = new Map([
    ['client-1', { useHostIp: false }],
  ]);
  (manager as any).stop = async () => {
    stopCalls++;
  };
  (manager as any).start = async () => {
    startCalls++;
    (manager as any).resolvedForwardingMode = (manager as any).forwardingModeOverride ?? 'socket';
    (manager as any).forwardingModeOverride = undefined;
    (manager as any).vpnServer = { running: true };
  };

  const restarted = await (manager as any).reconcileForwardingMode();

  expect(restarted).toEqual(true);
  expect(stopCalls).toEqual(1);
  expect(startCalls).toEqual(1);
  expect((manager as any).resolvedForwardingMode).toEqual('socket');
});

tap.test('VpnManager keeps explicit hybrid mode even without host-IP clients', async () => {
  const manager = new VpnManager({ forwardingMode: 'hybrid' });

  let stopCalls = 0;
  let startCalls = 0;

  (manager as any).vpnServer = { running: true };
  (manager as any).resolvedForwardingMode = 'hybrid';
  (manager as any).clients = new Map([
    ['client-1', { useHostIp: false }],
  ]);
  (manager as any).stop = async () => {
    stopCalls++;
  };
  (manager as any).start = async () => {
    startCalls++;
  };

  const restarted = await (manager as any).reconcileForwardingMode();

  expect(restarted).toEqual(false);
  expect(stopCalls).toEqual(0);
  expect(startCalls).toEqual(0);
  expect((manager as any).resolvedForwardingMode).toEqual('hybrid');
});

tap.test('DcRouter.updateVpnConfig swaps the runtime VPN resolver and restarts VPN services', async () => {
  const dcRouter = new DcRouter({
    smartProxyConfig: { routes: [] },
    dbConfig: { enabled: false },
    vpnConfig: { enabled: false },
  });

  let stopCalls = 0;
  let setupCalls = 0;
  let applyCalls = 0;
  const resolverValues: Array<unknown> = [];

  dcRouter.vpnManager = {
    stop: async () => {
      stopCalls++;
    },
  } as any;
  (dcRouter as any).routeConfigManager = {
    setVpnClientIpsResolver: (resolver: unknown) => {
      resolverValues.push(resolver);
    },
    applyRoutes: async () => {
      applyCalls++;
    },
  };
  (dcRouter as any).setupVpnServer = async () => {
    setupCalls++;
    dcRouter.vpnManager = {
      stop: async () => {
        stopCalls++;
      },
    } as any;
  };

  await dcRouter.updateVpnConfig({ enabled: true, subnet: '10.9.0.0/24' });

  expect(stopCalls).toEqual(1);
  expect(setupCalls).toEqual(1);
  expect(applyCalls).toEqual(0);
  expect(typeof resolverValues.at(-1)).toEqual('function');

  await dcRouter.updateVpnConfig({ enabled: false });

  expect(stopCalls).toEqual(2);
  expect(setupCalls).toEqual(1);
  expect(applyCalls).toEqual(1);
  expect(resolverValues.at(-1)).toBeUndefined();
  expect(dcRouter.vpnManager).toBeUndefined();
});

export default tap.start()