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

const MovementManager = require('../src/state/movementManager');

const noopLogger = { debug() {}, info() {}, warn() {}, error() {} };
const sleep = (ms) => new Promise((r) => setTimeout(r, ms));

function makeManager({ mode = 'staticspeed', speed = 50, interval = 1000, initial = 0 } = {}) {
  // speed%/s on a 0..100 range → velocity = speed %/s. interval defaults to the
  // production 1000ms so the abort-before-first-tick race is reproduced exactly.
  return new MovementManager(
    {
      position: { min: 0, max: 100, initial },
      movement: { mode, speed, maxSpeed: 1000, interval },
    },
    noopLogger,
    new EventEmitter(),
  );
}

// Regression: before the time-based fix, currentPosition only advanced inside
// setInterval(…, interval). An abort landing before the first tick (the MGC's
// ~1s re-command cadence vs the 1000ms tick) left the pump frozen at the start.
for (const mode of ['staticspeed', 'dynspeed']) {
  test(`${mode}: abort before the first tick still advances position (no freeze)`, async () => {
    const mgr = makeManager({ mode, speed: 50, interval: 1000 });
    const ac = new AbortController();
    const moving = mgr.moveTo(80, ac.signal); // ~1.6s of travel; first tick at 1000ms
    await sleep(200);                          // interrupt well before the first tick
    ac.abort();
    await moving;
    const pos = mgr.getCurrentPosition();
    // The fix: any non-zero progress means the abort re-based instead of
    // freezing at the start. (dynspeed eases in, so its early travel is small
    // but must still be > 0; staticspeed travels ~velocity·elapsed.)
    assert.ok(pos > 0, `expected partial progress, got frozen at ${pos}`);
    assert.ok(pos < 80, `should not have reached target, got ${pos}`);
  });

  test(`${mode}: a fresh setpoint re-bases from the interrupted position`, async () => {
    const mgr = makeManager({ mode, speed: 50, interval: 1000 });
    const ac1 = new AbortController();
    const m1 = mgr.moveTo(80, ac1.signal);
    await sleep(200);
    ac1.abort();
    await m1;
    const afterFirst = mgr.getCurrentPosition();

    // New command toward 0 must start from afterFirst, not from 80 or a reset.
    const ac2 = new AbortController();
    const m2 = mgr.moveTo(0, ac2.signal);
    await sleep(100);
    ac2.abort();
    await m2;
    const afterSecond = mgr.getCurrentPosition();
    assert.ok(afterSecond < afterFirst, `expected re-base downward from ${afterFirst}, got ${afterSecond}`);
    assert.ok(afterSecond >= 0, `position must stay in range, got ${afterSecond}`);
  });
}

test('staticspeed: an uninterrupted move reaches the exact target', async () => {
  const mgr = makeManager({ mode: 'staticspeed', speed: 500, interval: 10 }); // fast
  await mgr.moveTo(40, new AbortController().signal);
  assert.equal(mgr.getCurrentPosition(), 40);
});

test('position is clamped to [min,max] on a re-based abort', async () => {
  const mgr = makeManager({ mode: 'staticspeed', speed: 5000, interval: 1000, initial: 0 });
  const ac = new AbortController();
  const moving = mgr.moveTo(100, ac.signal);
  await sleep(150);
  ac.abort();
  await moving;
  const pos = mgr.getCurrentPosition();
  assert.ok(pos >= 0 && pos <= 100, `clamped, got ${pos}`);
});