const test = require('node:test');
const assert = require('node:assert/strict');
const EventEmitter = require('events');

const Valve = require('../../src/specificClass');

function buildValve({ runtimeOptions = {} } = {}) {
  return new Valve(
    {
      general: {
        name: 'valve-fluid-test',
        logging: { enabled: false, logLevel: 'error' },
      },
      asset: {
        supplier: 'binder',
        category: 'valve',
        type: 'control',
        model: 'ECDV',
        unit: 'm3/h',
      },
      functionality: {
        positionVsParent: 'atEquipment',
      },
    },
    {
      general: {
        logging: { enabled: false, logLevel: 'error' },
      },
      movement: { speed: 1 },
      time: { starting: 0, warmingup: 0, stopping: 0, coolingdown: 0 },
    },
    runtimeOptions
  );
}

function buildFluidSource({
  id,
  softwareType,
  serviceType = null,
  status = 'resolved',
}) {
  const emitter = new EventEmitter();
  let contract = { status, serviceType };
  return {
    emitter,
    config: {
      general: { id, name: id },
      functionality: { softwareType },
      asset: {
        serviceType: serviceType || undefined,
      },
    },
    getFluidContract() {
      return { ...contract };
    },
    setFluidContract(next) {
      contract = { ...contract, ...next };
    },
  };
}

test('valve flags mismatch for direct machine source with incompatible fluid', () => {
  const valve = buildValve({ runtimeOptions: { serviceType: 'gas' } });
  const source = buildFluidSource({
    id: 'machine-1',
    softwareType: 'machine',
    serviceType: 'liquid',
  });

  assert.equal(valve.registerChild(source, 'machine'), true);
  const compatibility = valve.getFluidCompatibility();
  assert.equal(compatibility.status, 'mismatch');
  assert.equal(compatibility.expectedServiceType, 'gas');
  assert.equal(compatibility.receivedServiceType, 'liquid');

  valve.destroy();
});

test('valve flags conflict when grouped upstream sources expose mixed fluids', () => {
  const valve = buildValve();
  const machine = buildFluidSource({
    id: 'machine-1',
    softwareType: 'machine',
    serviceType: 'liquid',
  });
  const group = buildFluidSource({
    id: 'vgc-1',
    softwareType: 'valvegroupcontrol',
    serviceType: 'gas',
  });

  assert.equal(valve.registerChild(machine, 'machine'), true);
  assert.equal(valve.registerChild(group, 'valvegroupcontrol'), true);

  const compatibility = valve.getFluidCompatibility();
  assert.equal(compatibility.status, 'conflict');
  assert.deepEqual(new Set(compatibility.upstreamServiceTypes), new Set(['liquid', 'gas']));

  valve.destroy();
});

test('valve updates compatibility when upstream group fluid contract changes', async () => {
  const valve = buildValve({ runtimeOptions: { serviceType: 'gas' } });
  const group = buildFluidSource({
    id: 'vgc-1',
    softwareType: 'valvegroupcontrol',
    serviceType: 'gas',
  });

  assert.equal(valve.registerChild(group, 'valvegroupcontrol'), true);
  assert.equal(valve.getFluidCompatibility().status, 'match');

  group.setFluidContract({ serviceType: 'liquid' });
  group.emitter.emit('fluidContractChange');

  // Event handlers run synchronously; await microtask for deterministic test sequencing.
  await Promise.resolve();

  const compatibility = valve.getFluidCompatibility();
  assert.equal(compatibility.status, 'mismatch');
  assert.equal(compatibility.receivedServiceType, 'liquid');

  valve.destroy();
});