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

const NodeClass = require('../../src/nodeClass');
const { makeNodeStub, makeREDStub } = require('../helpers/factories');

// Drive routing through the public BaseNodeAdapter surface only. We
// construct a full nodeClass instance and invoke the input handler
// installed by the base on `node.on('input', ...)`. Side-effects are
// observed via `node._sent`, the registered child registry on the
// source, and instrumented domain methods.

function makeUiConfig(overrides = {}) {
  // Post-AssetResolver: editor saves only model + unit + uuid/tagCode.
  // supplier/category/assetType are derived at runtime.
  return {
    unit: 'm3/h',
    enableLog: false,
    logLevel: 'error',
    model: 'hidrostal-H05K-S03R',
    curvePressureUnit: 'mbar',
    curveFlowUnit: 'm3/h',
    curvePowerUnit: 'kW',
    curveControlUnit: '%',
    positionVsParent: 'atEquipment',
    speed: 1,
    movementMode: 'staticspeed',
    startup: 0,
    warmup: 0,
    shutdown: 0,
    cooldown: 0,
    ...overrides,
  };
}

// Adapters built in these tests park a periodic status-poll timer. We
// drive the BaseNodeAdapter close handler after each test so the timer
// stops and node:test exits cleanly — this is the public teardown path
// Node-RED itself uses on flow shutdown.
const _adapters = [];
function buildAdapter({ ui = makeUiConfig(), redNodes = {} } = {}) {
  const node = makeNodeStub();
  const RED = makeREDStub(redNodes);
  const inst = new NodeClass(ui, RED, node, 'rotatingMachine');
  _adapters.push(node);
  return { inst, node, RED };
}
test.afterEach(() => {
  while (_adapters.length) {
    const node = _adapters.pop();
    try { node._handlers.close?.(() => {}); } catch (_) { /* best effort */ }
  }
});

// Capture every call to source.handleInput so the test can assert which
// canonical action the dispatch produced.
function instrumentHandleInput(source) {
  const calls = [];
  const orig = source.handleInput.bind(source);
  source.handleInput = async (...args) => {
    calls.push(args);
    return orig(...args);
  };
  return calls;
}

async function fireInput(node, msg) {
  await node._handlers.input(msg, (out) => node._sent.push(out), () => {});
}

test('set.mode (and legacy setMode alias) flips the source mode', async () => {
  const { inst, node } = buildAdapter();
  const startingMode = inst.source.currentMode;

  await fireInput(node, { topic: 'set.mode', payload: 'virtualControl' });
  assert.equal(inst.source.currentMode, 'virtualControl');
  assert.notEqual(inst.source.currentMode, startingMode);

  // Legacy alias still works (emits a one-time deprecation warning).
  await fireInput(node, { topic: 'setMode', payload: 'auto' });
  assert.equal(inst.source.currentMode, 'auto');
});

test('cmd.startup / execSequence / flowMovement / emergencystop all reach handleInput with the right action', async () => {
  const { inst, node } = buildAdapter();
  const calls = instrumentHandleInput(inst.source);

  await fireInput(node, { topic: 'cmd.startup', payload: { source: 'GUI' } });
  await fireInput(node, { topic: 'execSequence', payload: { source: 'GUI', action: 'startup' } });
  await fireInput(node, { topic: 'set.flow-setpoint', payload: { source: 'GUI', setpoint: 123 } });
  await fireInput(node, { topic: 'flowMovement', payload: { source: 'GUI', action: 'flowMovement', setpoint: 99 } });
  await fireInput(node, { topic: 'cmd.estop', payload: { source: 'GUI' } });
  await fireInput(node, { topic: 'emergencystop', payload: { source: 'GUI', action: 'emergencystop' } });

  // Each call is [source, action, parameter?]. estop calls handleInput
  // with only two args; the rest pass a third.
  assert.equal(calls.length, 6);
  assert.deepEqual(calls[0], ['GUI', 'execSequence', 'startup']);
  assert.deepEqual(calls[1], ['GUI', 'execSequence', 'startup']);
  assert.deepEqual(calls[2], ['GUI', 'flowMovement', 123]);
  assert.deepEqual(calls[3], ['GUI', 'flowMovement', 99]);
  assert.deepEqual(calls[4], ['GUI', 'emergencystop']);
  assert.deepEqual(calls[5], ['GUI', 'emergencystop']);
});

test('child.register / registerChild resolves the sibling node and registers it', async () => {
  // The handler reads child via RED.nodes.getNode(payload).source; we
  // pre-seed RED's lookup with a domain stub that owns a .source.
  const fakeChildSource = { config: { functionality: { positionVsParent: 'downstream' } } };
  const { inst, node } = buildAdapter({
    redNodes: { 'child-1': { source: fakeChildSource } },
  });
  const regCalls = [];
  inst.source.childRegistrationUtils.registerChild = (childSource, pos) => {
    regCalls.push([childSource, pos]);
  };

  await fireInput(node, { topic: 'child.register', payload: 'child-1', positionVsParent: 'downstream' });
  assert.equal(regCalls.length, 1);
  assert.equal(regCalls[0][0], fakeChildSource);
  assert.equal(regCalls[0][1], 'downstream');

  // Missing child is a no-op (no throw, just a warn).
  await fireInput(node, { topic: 'child.register', payload: 'no-such-id', positionVsParent: 'upstream' });
  assert.equal(regCalls.length, 1);
});

test('data.simulate-measurement validates payload and rejects invalid combinations', async () => {
  const { inst, node } = buildAdapter();
  const warns = [];
  inst.source.logger.warn = (m) => warns.push(String(m));
  const dispatched = [];
  inst.source.updateSimulatedMeasurement = (type, pos, val) => dispatched.push(['sim', type, pos, val]);
  inst.source.updateMeasuredPower = (val, pos) => dispatched.push(['power', val, pos]);

  // 1. non-numeric value
  await fireInput(node, { topic: 'data.simulate-measurement', payload: { type: 'pressure', position: 'upstream', value: 'NaN-string', unit: 'mbar' } });
  // 2. missing unit
  await fireInput(node, { topic: 'data.simulate-measurement', payload: { type: 'flow', position: 'upstream', value: 12 } });
  // 3. unsupported type
  await fireInput(node, { topic: 'data.simulate-measurement', payload: { type: 'unknown', position: 'upstream', value: 12, unit: 'm3/h' } });

  assert.equal(dispatched.length, 0);
  const payloadWarns = warns.filter((w) => !/deprecated/i.test(w));
  assert.equal(payloadWarns.length, 3);
  assert.match(payloadWarns[0], /finite number/i);
  // simulator validates type before unit, so "unknown" trips first.
  assert.ok(payloadWarns.slice(1).some((w) => /unsupported simulatemeasurement type/i.test(w)));
  assert.ok(payloadWarns.slice(1).some((w) => /payload\.unit is required/i.test(w)));
});

test('data.simulate-measurement routes valid power to updateMeasuredPower', async () => {
  const { inst, node } = buildAdapter();
  const dispatched = [];
  inst.source.updateMeasuredPower = (val, pos) => dispatched.push([val, pos]);

  await fireInput(node, {
    topic: 'data.simulate-measurement',
    payload: { type: 'power', position: 'atEquipment', value: 7.5, unit: 'kW' },
  });

  assert.equal(dispatched.length, 1);
  assert.equal(dispatched[0][0], 7.5);
  assert.equal(dispatched[0][1], 'atEquipment');
});

test('query.curves / query.cog send a reply on the process output port', async () => {
  const { inst, node } = buildAdapter();
  inst.source.showWorkingCurves = () => ({ curve: [1, 2, 3] });
  inst.source.showCoG = () => ({ cog: 0.77 });
  // Drop earlier non-reply emissions so the assertion has a clean slice.
  node._sent.length = 0;

  await fireInput(node, { topic: 'query.curves', payload: { request: true } });
  await fireInput(node, { topic: 'query.cog', payload: { request: true } });

  assert.equal(node._sent.length, 2);
  assert.ok(Array.isArray(node._sent[0]));
  assert.equal(node._sent[0].length, 3);
  assert.equal(node._sent[0][0].topic, 'showWorkingCurves');
  assert.equal(node._sent[0][1], null);
  assert.equal(node._sent[0][2], null);
  assert.deepEqual(node._sent[0][0].payload, { curve: [1, 2, 3] });
  assert.equal(node._sent[1][0].topic, 'showCoG');
  assert.deepEqual(node._sent[1][0].payload, { cog: 0.77 });
});

test('status badge: source.getStatusBadge() warns when pressure is not initialized', () => {
  const { inst } = buildAdapter();
  // Drive into an operational state that requires pressure initialisation;
  // then assert the badge reflects the warning.
  inst.source.state.stateManager.currentState = 'operational';
  // Force pressureInit to report uninitialised, regardless of construction.
  inst.source.pressureInit.getStatus = () => ({
    initialized: false, hasUpstream: false, hasDownstream: false, hasDifferential: false,
  });

  const status = inst.source.getStatusBadge();
  assert.equal(status.fill, 'yellow');
  assert.equal(status.shape, 'ring');
  assert.match(status.text, /pressure not initialized/i);
});

test('unknown topic dispatched to the input handler does not throw', async () => {
  const { node } = buildAdapter();
  await assert.doesNotReject(async () => {
    await fireInput(node, { topic: 'totally.unknown.topic', payload: 42 });
  });
});