'use strict';

// 呈现时间层的纯用例（不需要 Electron、不需要显示器）：
//   node test/presented-time.test.js
// 「什么时候该动画、动画到哪、被打断怎么办」是这次跳转动画最容易写错的地方，
// 所以把它从渲染代码里拆出来，先在 node 里钉死，Windows 上就只剩「观感」要试。

const presented = require('../renderer/presented-time');

const { JUMP_THRESHOLD_MS, EASE_MS } = presented;

let passed = 0;
const failures = [];

function check(name, ok, detail) {
  if (ok) {
    passed += 1;
    console.log(`PASS  ${name}${detail ? `  [${detail}]` : ''}`);
  } else {
    failures.push(name);
    console.log(`FAIL  ${name}${detail ? `  [${detail}]` : ''}`);
  }
}

const T0 = 1_700_000_000_000; // 固定基准时刻，测试不依赖真实时钟
const SECOND = 1000;
const MINUTE = 60 * SECOND;

// 走时参数就是主进程下发的那个快照，这里照原样造
const snap = (baseMs, baseRealMs, rate) => ({ baseMs, baseRealMs, rate });

console.log('--- 平时不动画 ---');
{
  const layer = presented.create();
  presented.accept(layer, T0, snap(T0, T0, 1));
  check('首个参数直接对齐（没有"上一个值"可以缓动）', presented.valueAt(layer, T0) === T0);
  check('走 1 秒后呈现时间 = 目标时间，没有动画', presented.valueAt(layer, T0 + SECOND) === T0 + SECOND);
  check('走 1 小时后依然相等（不会被动画层拖后腿）',
    presented.valueAt(layer, T0 + 3600 * SECOND) === T0 + 3600 * SECOND);
}
{
  // 首个参数哪怕离当前显示时间很远（例如时钟窗口后打开），也不该滚一次
  const layer = presented.create();
  presented.accept(layer, T0, snap(T0 + 10 * MINUTE, T0, 1));
  check('首个参数：直接对齐，不做动画', presented.valueAt(layer, T0) === T0 + 10 * MINUTE);
}

console.log(`--- 大跳变（> ${JUMP_THRESHOLD_MS}ms）缓动 ${EASE_MS}ms ---`);
{
  const layer = presented.create();
  presented.accept(layer, T0, snap(T0, T0, 1));
  const target = T0 + 30 * MINUTE;
  presented.accept(layer, T0, snap(target, T0, 1)); // 快进 +30 分钟

  check('跳变当帧显示的还是跳变前的时间（数字从这里开始滚）',
    presented.valueAt(layer, T0) === T0, String(presented.valueAt(layer, T0)));

  const half = presented.valueAt(layer, T0 + EASE_MS / 2);
  check('半程时停在两者之间', half > T0 && half < target, `${Math.round(half - T0)}ms`);
  check('缓出：半程已经走完一大半路程（不是匀速）', half - T0 > (target - T0) / 2,
    `${Math.round(((half - T0) / (target - T0)) * 100)}%`);

  let previous = -Infinity;
  let monotonic = true;
  for (let t = 0; t <= EASE_MS; t += 25) {
    const value = presented.valueAt(layer, T0 + t);
    if (value < previous) monotonic = false;
    previous = value;
  }
  check('整段缓动单调向前（不会中途倒退）', monotonic);

  // 结束时要比的是「那一刻的目标时间」—— 目标本身还在按 ×1 继续走
  const settled = target + EASE_MS;
  check(`满 ${EASE_MS}ms 精确落在目标上（不留残余，否则数字永远差几百毫秒）`,
    presented.valueAt(layer, T0 + EASE_MS) === settled, String(presented.valueAt(layer, T0 + EASE_MS) - settled));
  check('之后一直等于目标时间', presented.valueAt(layer, T0 + 5000) === target + 5000);
}
{
  // 往回跳（设定到更早的时间）同样缓动，只是方向相反
  const layer = presented.create();
  presented.accept(layer, T0, snap(T0, T0, 1));
  const target = T0 - 10 * MINUTE;
  presented.accept(layer, T0, snap(target, T0, 1));
  check('负向跳变当帧仍在原处', presented.valueAt(layer, T0) === T0);

  let previous = Infinity;
  let monotonic = true;
  for (let t = 0; t <= EASE_MS; t += 25) {
    const value = presented.valueAt(layer, T0 + t);
    if (value > previous) monotonic = false;
    previous = value;
  }
  check('负向跳变整段单调往回', monotonic);
  check('负向跳变落在目标上', presented.valueAt(layer, T0 + EASE_MS) === target + EASE_MS);
}

console.log('--- 小跳变直接跳 ---');
{
  const layer = presented.create();
  presented.accept(layer, T0, snap(T0, T0, 1));
  presented.accept(layer, T0, snap(T0 + JUMP_THRESHOLD_MS, T0, 1));
  check(`正好 ${JUMP_THRESHOLD_MS}ms：直接跳，不缓动`,
    presented.valueAt(layer, T0) === T0 + JUMP_THRESHOLD_MS);

  const other = presented.create();
  presented.accept(other, T0, snap(T0, T0, 1));
  presented.accept(other, T0, snap(T0 + JUMP_THRESHOLD_MS + 1, T0, 1));
  check(`超过 ${JUMP_THRESHOLD_MS}ms：开始缓动（当帧还在原处）`, presented.valueAt(other, T0) === T0);
}

console.log('--- 改倍率不是跳变 ---');
{
  const before = snap(T0, T0, 1);
  const visible = presented.targetAt(before, T0 + 5000); // 改倍率那一刻的显示时间
  const after = snap(visible, T0 + 5000, 60);            // 模型先固化显示时间再换倍率

  check('模型锚点式换倍率：同一时刻新旧参数算出的时间相等',
    presented.jumpBetween(before, after) === 0, String(presented.jumpBetween(before, after)));

  const layer = presented.create();
  presented.accept(layer, T0, before);
  presented.accept(layer, T0 + 5000, after);
  check('换倍率后画面不缓动，当帧就是固化下来的那个值',
    presented.valueAt(layer, T0 + 5000) === visible);
  check('换倍率后立刻按新倍率走（不会被动画拦住）',
    presented.valueAt(layer, T0 + 5016) === visible + 16 * 60, String(presented.valueAt(layer, T0 + 5016) - visible));
}
{
  const before = snap(T0, T0, 1);
  const after = snap(T0 + 5 * SECOND, T0, 1); // 一次真实的 +5 秒快进
  check('快进 +5 秒：参数比较出来的跳变幅度就是 5 秒',
    presented.jumpBetween(before, after) === 5 * SECOND, String(presented.jumpBetween(before, after)));
  check('没有上一个参数时不判定跳变', presented.jumpBetween(null, after) === 0);
}

console.log('--- 缓动中又跳一次：从当前呈现值重新出发 ---');
{
  const layer = presented.create();
  presented.accept(layer, T0, snap(T0, T0, 1));
  presented.accept(layer, T0, snap(T0 + 30 * MINUTE, T0, 1));
  const mid = presented.valueAt(layer, T0 + 200);
  check('中途确实停在两者之间', mid > T0 && mid < T0 + 30 * MINUTE, `${Math.round(mid - T0)}ms`);

  // 还没滚完又点了一次 +1 分钟：模型的目标变成 31 分钟
  presented.accept(layer, T0 + 200, snap(T0 + 31 * MINUTE, T0 + 200, 1));
  check('重定向当帧接着当前呈现值，不跳回起点',
    presented.valueAt(layer, T0 + 200) === mid, `${Math.round(presented.valueAt(layer, T0 + 200) - mid)}ms`);
  check('重定向后不会倒退', presented.valueAt(layer, T0 + 201) >= mid);
  check('重定向后仍然精确落在新目标上',
    presented.valueAt(layer, T0 + 200 + EASE_MS) === T0 + 31 * MINUTE + EASE_MS);
}

console.log('--- 暂停不缓动 ---');
{
  const layer = presented.create();
  presented.accept(layer, T0, snap(T0, T0, 1));
  presented.accept(layer, T0, snap(T0 + 30 * MINUTE, T0, 1));
  const mid = presented.valueAt(layer, T0 + 100);
  check('跳变后 100ms 正在缓动', mid > T0 && mid < T0 + 30 * MINUTE, `${Math.round(mid - T0)}ms`);

  // 暂停：模型把显示时间固化在暂停那一刻（也就是刚跳到的目标）
  presented.accept(layer, T0 + 100, snap(T0 + 30 * MINUTE, T0 + 100, 0));
  check('暂停当帧就落到暂停时刻的准确时间（不会挂着走不完的中间值）',
    presented.valueAt(layer, T0 + 100) === T0 + 30 * MINUTE);
  check('暂停后画面纹丝不动',
    presented.valueAt(layer, T0 + 9000) === presented.valueAt(layer, T0 + 100));
}
{
  const layer = presented.create();
  presented.accept(layer, T0, snap(T0, T0, 1));
  presented.accept(layer, T0, snap(T0, T0, 0));
  check('暂停状态下快进也是直接落到新值（暂停画面必须是精确的暂停时间）',
    presented.valueAt(layer, T0) === T0);
  presented.accept(layer, T0 + 5000, snap(T0 + 5 * MINUTE, T0 + 5000, 0));
  check('暂停后快进：当帧就是新值，不滚',
    presented.valueAt(layer, T0 + 5000) === T0 + 5 * MINUTE);
  check('暂停后快进：之后继续定格在该值',
    presented.valueAt(layer, T0 + 60 * SECOND) === T0 + 5 * MINUTE);
}

console.log('');
if (failures.length === 0) {
  console.log(`全部通过：${passed}/${passed}`);
  process.exit(0);
} else {
  console.log(`通过 ${passed}，失败 ${failures.length}：${failures.join('；')}`);
  process.exit(1);
}