import assert from "node:assert/strict";
import { test } from "node:test";
import {
  easeOut,
  easeInOut,
  enter,
  visibility,
  shots,
} from "../cinematics/motion.mjs";

test("cinematic timeline preserves all real site captures and covers exactly thirty seconds", () => {
  assert.equal(shots[0].start, 0);
  assert.equal(shots.at(-1)?.end, 30);
  assert.deepEqual(
    shots.flatMap((s) => (s.image ? [s.image] : [])),
    ["home", "catalog", "game", "map"],
  );
  for (let i = 1; i < shots.length; i++)
    assert.equal(shots[i].start, shots[i - 1].end);
});

test("canonical motion curves clamp endpoints and have no overshoot", () => {
  for (const curve of [easeOut, easeInOut]) {
    assert.equal(curve(-1), 0);
    assert.equal(curve(0), 0);
    assert.equal(curve(1), 1);
    assert.equal(curve(2), 1);
    let previous = 0;
    for (let i = 0; i <= 100; i++) {
      const n = curve(i / 100);
      assert.ok(n >= previous && n <= 1);
      previous = n;
    }
  }
  assert.ok(
    easeOut(0.25) > 0.6,
    "the entry must respond promptly rather than ease in",
  );
});

test("screenshots settle quickly and stay fully readable throughout the hold", () => {
  for (const shot of shots.filter((s) => s.image)) {
    assert.equal(enter(shot.start + 0.25, shot.start), 1);
    assert.equal(visibility(shot.start + 1, shot.start, shot.end), 1);
    assert.equal(visibility(shot.end - 1, shot.start, shot.end), 1);
    assert.equal(visibility(shot.end, shot.start, shot.end), 0);
  }
});