// Tests for build-video's snap: where a cut lands in a pause.
//
// Run with: pnpm test:scripts
import assert from "node:assert/strict";
import test from "node:test";

import { snap } from "./build-video.mjs";

const SIL = [{ s: 10, e: 10.8 }, { s: 20, e: 20.12 }];

test("snap: the default keeps 0.10 s before speech and 0.18 s after it", () => {
  assert.deepEqual(snap(10.5, SIL, "end", 1.6), { at: 10.18, snapped: true });
  assert.equal(Number(snap(10.5, SIL, "start", 1.6).at.toFixed(3)), 10.7);
  assert.deepEqual(snap(15, SIL, "end", 1.6), { at: 15, snapped: false });
});

test("snap: snapTail / snapLead keep more of the pause, never more than it holds", () => {
  const render = { snapTail: 0.55, snapLead: 0.45 };
  assert.equal(snap(10.5, SIL, "end", 1.6, render).at, 10.55);
  assert.equal(Number(snap(10.5, SIL, "start", 1.6, render).at.toFixed(3)), 10.35);
  // A 0.12 s gap: the whole gap and no more.
  assert.equal(Number(snap(20, SIL, "end", 1, render).at.toFixed(3)), 20.12);
  assert.equal(snap(20.1, SIL, "start", 1, render).at, 20);
});