// Unit-handling tests for the measurement data.measurement command.
// Verifies that analog and digital modes accept the same payload shapes
// (bare scalar | rich object | per-channel map) and that supplied units
// are converted into the channel's configured (dropdown) unit.
//
// Run with:  node --test test/basic/commands-units.basic.test.js

'use strict';

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

const { createRegistry } = require('generalFunctions');
const commands = require('../../src/commands');

// --- helpers ---------------------------------------------------------------

function makeLogger() {
  const calls = { warn: [], error: [], info: [], debug: [] };
  return {
    calls,
    warn: (m) => calls.warn.push(String(m)),
    error: (m) => calls.error.push(String(m)),
    info: (m) => calls.info.push(String(m)),
    debug: (m) => calls.debug.push(String(m)),
  };
}

// Analog source mock: exposes analogChannel.unit so the handler can resolve
// the channel's configured (dropdown) unit. inputValueSets captures the
// value that was eventually written, after any unit conversion.
function makeAnalogSource({ unit = 'mbar' } = {}) {
  const inputValueSets = [];
  let _v = 0;
  return {
    source: {
      mode: 'analog',
      logger: makeLogger(),
      analogChannel: { unit },
      get inputValue() { return _v; },
      set inputValue(v) { _v = v; inputValueSets.push(v); },
    },
    inputValueSets,
  };
}

// Digital source mock: exposes channels.get(key).unit per channel so each
// digital entry can be converted independently. handleDigitalPayloadCalls
// captures the *flat* {key: convertedNumber} the handler ultimately passes.
function makeDigitalSource(channelUnits) {
  const handleDigitalPayloadCalls = [];
  const channels = new Map(Object.entries(channelUnits).map(([k, u]) => [k, { unit: u }]));
  return {
    source: {
      mode: 'digital',
      logger: makeLogger(),
      channels,
      handleDigitalPayload: (p) => { handleDigitalPayloadCalls.push(p); return { ok: true }; },
    },
    handleDigitalPayloadCalls,
  };
}

function makeCtx({ logger = makeLogger() } = {}) {
  return { logger, RED: { nodes: { getNode: () => undefined } }, node: {}, send: () => {} };
}

function makeRegistry(logger) {
  return createRegistry(commands, { logger });
}

// --- analog ----------------------------------------------------------------

test('analog: bare number uses channel default unit (no conversion)', async () => {
  const { source, inputValueSets } = makeAnalogSource({ unit: 'mbar' });
  const reg = makeRegistry(makeLogger());

  await reg.dispatch({ topic: 'data.measurement', payload: 1234 }, source, makeCtx());

  assert.deepEqual(inputValueSets, [1234]);
});

test('analog: { value, unit } same as channel passes through unchanged', async () => {
  const { source, inputValueSets } = makeAnalogSource({ unit: 'mbar' });
  const reg = makeRegistry(makeLogger());

  await reg.dispatch(
    { topic: 'data.measurement', payload: { value: 500, unit: 'mbar' } },
    source,
    makeCtx(),
  );

  assert.deepEqual(inputValueSets, [500]);
});

test('analog: { value, unit } different but compatible unit is converted', async () => {
  const { source, inputValueSets } = makeAnalogSource({ unit: 'mbar' });
  const reg = makeRegistry(makeLogger());

  // 1 bar = 1000 mbar.
  await reg.dispatch(
    { topic: 'data.measurement', payload: { value: 1, unit: 'bar' } },
    source,
    makeCtx(),
  );

  assert.equal(inputValueSets.length, 1);
  assert.ok(Math.abs(inputValueSets[0] - 1000) < 1e-6,
    `expected 1 bar → 1000 mbar, got ${inputValueSets[0]}`);
});

test('analog: msg.unit fallback works for bare-number payloads', async () => {
  const { source, inputValueSets } = makeAnalogSource({ unit: 'mbar' });
  const reg = makeRegistry(makeLogger());

  await reg.dispatch(
    { topic: 'data.measurement', payload: 1, unit: 'bar' },
    source,
    makeCtx(),
  );

  assert.equal(inputValueSets.length, 1);
  assert.ok(Math.abs(inputValueSets[0] - 1000) < 1e-6,
    `expected 1 bar → 1000 mbar via msg.unit, got ${inputValueSets[0]}`);
});

test('analog: unit-measure mismatch warns and falls back to raw value', async () => {
  const { source, inputValueSets } = makeAnalogSource({ unit: 'mbar' });
  const ctxLogger = makeLogger();
  const reg = makeRegistry(ctxLogger);

  await reg.dispatch(
    { topic: 'data.measurement', payload: { value: 42, unit: 'kg' } },
    source,
    makeCtx({ logger: ctxLogger }),
  );

  assert.deepEqual(inputValueSets, [42]);
  assert.ok(
    ctxLogger.calls.warn.some((m) => m.includes("'kg'") && m.includes("'mbar'")),
    `expected mismatch warning, got: ${JSON.stringify(ctxLogger.calls.warn)}`,
  );
});

test('analog: unknown unit warns and falls back to raw value', async () => {
  const { source, inputValueSets } = makeAnalogSource({ unit: 'mbar' });
  const ctxLogger = makeLogger();
  const reg = makeRegistry(ctxLogger);

  await reg.dispatch(
    { topic: 'data.measurement', payload: { value: 5, unit: 'gribbles' } },
    source,
    makeCtx({ logger: ctxLogger }),
  );

  assert.deepEqual(inputValueSets, [5]);
  assert.ok(
    ctxLogger.calls.warn.some((m) => m.includes("'gribbles'")),
    `expected unknown-unit warning, got: ${JSON.stringify(ctxLogger.calls.warn)}`,
  );
});

test('analog: numeric string with msg.unit is converted', async () => {
  const { source, inputValueSets } = makeAnalogSource({ unit: 'mbar' });
  const reg = makeRegistry(makeLogger());

  await reg.dispatch(
    { topic: 'data.measurement', payload: '2', unit: 'bar' },
    source,
    makeCtx(),
  );

  assert.equal(inputValueSets.length, 1);
  assert.ok(Math.abs(inputValueSets[0] - 2000) < 1e-6,
    `expected '2' bar → 2000 mbar, got ${inputValueSets[0]}`);
});

// --- digital ---------------------------------------------------------------

test('digital: per-channel { value, unit } converts each independently', async () => {
  const { source, handleDigitalPayloadCalls } = makeDigitalSource({
    pIn: 'mbar',
    pOut: 'Pa',
  });
  const reg = makeRegistry(makeLogger());

  await reg.dispatch(
    {
      topic: 'data.measurement',
      payload: {
        pIn:  { value: 1,    unit: 'bar' },     // → 1000 mbar
        pOut: { value: 1.5,  unit: 'bar' },     // → 150000 Pa
      },
    },
    source,
    makeCtx(),
  );

  assert.equal(handleDigitalPayloadCalls.length, 1);
  const flat = handleDigitalPayloadCalls[0];
  assert.ok(Math.abs(flat.pIn - 1000) < 1e-6, `pIn expected 1000, got ${flat.pIn}`);
  assert.ok(Math.abs(flat.pOut - 150000) < 1e-3, `pOut expected 150000, got ${flat.pOut}`);
});

test('digital: bare-number entries use the channel default unit', async () => {
  const { source, handleDigitalPayloadCalls } = makeDigitalSource({
    a: 'mbar',
    b: 'mbar',
  });
  const reg = makeRegistry(makeLogger());

  await reg.dispatch(
    { topic: 'data.measurement', payload: { a: 500, b: 750 } },
    source,
    makeCtx(),
  );

  assert.deepEqual(handleDigitalPayloadCalls[0], { a: 500, b: 750 });
});

test('digital: mixed rich + bare entries are converted per-channel', async () => {
  const { source, handleDigitalPayloadCalls } = makeDigitalSource({
    a: 'mbar',
    b: 'mbar',
  });
  const reg = makeRegistry(makeLogger());

  await reg.dispatch(
    {
      topic: 'data.measurement',
      payload: {
        a: { value: 1, unit: 'bar' },  // converted → 1000
        b: 750,                         // passthrough
      },
    },
    source,
    makeCtx(),
  );

  const flat = handleDigitalPayloadCalls[0];
  assert.ok(Math.abs(flat.a - 1000) < 1e-6, `a expected 1000, got ${flat.a}`);
  assert.equal(flat.b, 750);
});

test('digital: msg.unit applies to bare entries when no per-channel unit is given', async () => {
  const { source, handleDigitalPayloadCalls } = makeDigitalSource({
    a: 'mbar',
    b: 'mbar',
  });
  const reg = makeRegistry(makeLogger());

  await reg.dispatch(
    { topic: 'data.measurement', payload: { a: 1, b: 2 }, unit: 'bar' },
    source,
    makeCtx(),
  );

  const flat = handleDigitalPayloadCalls[0];
  assert.ok(Math.abs(flat.a - 1000) < 1e-6, `a expected 1000, got ${flat.a}`);
  assert.ok(Math.abs(flat.b - 2000) < 1e-6, `b expected 2000, got ${flat.b}`);
});

test('digital: unit-measure mismatch on one channel warns + falls back without affecting others', async () => {
  const { source, handleDigitalPayloadCalls } = makeDigitalSource({
    pressure: 'mbar',
    flow: 'm3/h',
  });
  const ctxLogger = makeLogger();
  const reg = makeRegistry(ctxLogger);

  await reg.dispatch(
    {
      topic: 'data.measurement',
      payload: {
        pressure: { value: 1,   unit: 'bar' },   // converted → 1000
        flow:     { value: 100, unit: 'kg' },    // mismatch → raw 100, warn
      },
    },
    source,
    makeCtx({ logger: ctxLogger }),
  );

  const flat = handleDigitalPayloadCalls[0];
  assert.ok(Math.abs(flat.pressure - 1000) < 1e-6, `pressure expected 1000, got ${flat.pressure}`);
  assert.equal(flat.flow, 100);
  assert.ok(
    ctxLogger.calls.warn.some((m) => m.includes("data.measurement[flow]") && m.includes("'kg'")),
    `expected per-channel mismatch warning, got: ${JSON.stringify(ctxLogger.calls.warn)}`,
  );
});

// --- backwards-compat -----------------------------------------------------

test('analog: { value } without unit uses channel default (rich-payload form)', async () => {
  const { source, inputValueSets } = makeAnalogSource({ unit: 'mbar' });
  const reg = makeRegistry(makeLogger());

  await reg.dispatch(
    { topic: 'data.measurement', payload: { value: 42 } },
    source,
    makeCtx(),
  );

  assert.deepEqual(inputValueSets, [42]);
});

test('analog: object payload that is *not* rich still triggers switch-mode warn', async () => {
  const { source, inputValueSets } = makeAnalogSource({ unit: 'mbar' });
  const ctxLogger = makeLogger();
  const reg = makeRegistry(ctxLogger);

  await reg.dispatch(
    { topic: 'data.measurement', payload: { tempA: 21.5, tempB: 19.8 } },
    source,
    makeCtx({ logger: ctxLogger }),
  );

  assert.equal(inputValueSets.length, 0);
  assert.ok(
    ctxLogger.calls.warn.some((m) => m.includes('analog mode') && m.includes('digital')),
    `expected switch-to-digital warn, got: ${JSON.stringify(ctxLogger.calls.warn)}`,
  );
});