Portfolio/tests/unit/maintenance-window.test.ts

import { describe, expect, it } from 'vitest';
import { SceneResourceBag } from '@/scene/resources';
import {
  createLightning,
  createMaintenanceWindow,
  LIGHTNING,
  MAINTENANCE_RAIN_PEAK,
  maintenanceTimeline,
  type MaintenanceFrame,
} from '@/scene/world/maintenance-window';

const sweep = (from: number, to: number, steps = 400): number[] =>
  Array.from({ length: steps + 1 }, (_, i) => from + ((to - from) * i) / steps);

describe('the 03:12 window timeline', () => {
  it('powers down, re-lights and moves packets monotonically with progress', () => {
    let previous: MaintenanceFrame | null = null;
    for (const p of sweep(0, 1)) {
      const frame = maintenanceTimeline(p);
      if (previous !== null) {
        expect(frame.dim).toBeGreaterThanOrEqual(previous.dim);
        expect(frame.relight).toBeGreaterThanOrEqual(previous.relight);
        expect(frame.packetPhase).toBeGreaterThanOrEqual(previous.packetPhase);
        expect(frame.offsite).toBeGreaterThanOrEqual(previous.offsite);
      }
      previous = frame;
    }
    expect(maintenanceTimeline(0)).toMatchObject({ dim: 0, relight: 0, packetPhase: 0, step: 'open' });
    expect(maintenanceTimeline(1)).toMatchObject({ dim: 1, relight: 1, packetPhase: 2, step: 'done' });
  });

  it('replays exactly in reverse (a rollback is the same frames backwards)', () => {
    const ps = sweep(0, 1);
    const forward = ps.map(maintenanceTimeline);
    const backward = [...ps].reverse().map(maintenanceTimeline).reverse();
    expect(backward).toEqual(forward);
  });

  it('keeps the windshield dry at the edges of the window and peaks at 0.7', () => {
    for (const p of [...sweep(0, 0.1, 20), ...sweep(0.9, 1, 20)]) {
      expect(maintenanceTimeline(p).rain).toBe(0);
    }
    const peak = Math.max(...sweep(0, 1).map((p) => maintenanceTimeline(p).rain));
    expect(peak).toBeCloseTo(MAINTENANCE_RAIN_PEAK, 5);
    expect(maintenanceTimeline(0.5).rain).toBeCloseTo(MAINTENANCE_RAIN_PEAK, 5);
  });

  it('stops the lightning and eases the storm out by cutover', () => {
    expect(maintenanceTimeline(0.3).lightning).toBe(1);
    for (const p of sweep(0.7, 1, 30)) expect(maintenanceTimeline(p).lightning).toBe(0);
    expect(maintenanceTimeline(0.05).storm).toBeGreaterThan(0.5);
    expect(maintenanceTimeline(0.95).storm).toBe(0);
    expect(maintenanceTimeline(0).storm).toBe(0);
  });

  it('sends the packets out during the backup and back during verification', () => {
    expect(maintenanceTimeline(0.1).packetPhase).toBe(0);
    expect(maintenanceTimeline(0.36).packetPhase).toBe(1);
    expect(maintenanceTimeline(0.6).packetPhase).toBe(1);
    expect(maintenanceTimeline(0.65).packetPhase).toBe(1);
    expect(maintenanceTimeline(0.9).packetPhase).toBe(2);
  });
});

describe('distant lightning', () => {
  const strikes = (seconds: number, enable = 1, dt = 1 / 60, seed?: number) => {
    const lightning = createLightning(seed);
    const onsets: number[] = [];
    let previous = 0;
    let peak = 0;
    for (let t = 0; t < seconds; t += dt) {
      const flash = lightning.sample(dt, enable);
      if (flash > previous && previous === 0) onsets.push(t);
      previous = flash;
      peak = Math.max(peak, flash);
    }
    return { onsets, peak };
  };

  it('strikes at most 0.35 times a second, never twice within 2.8 s', () => {
    for (const seed of [1, 0x0312, 99, 4242]) {
      const { onsets } = strikes(300, 1, 1 / 60, seed);
      expect(onsets.length).toBeGreaterThan(20);
      expect(onsets.length / 300).toBeLessThanOrEqual(0.35);
      for (let i = 1; i < onsets.length; i += 1) {
        expect(onsets[i]! - onsets[i - 1]!).toBeGreaterThanOrEqual(2.8);
      }
    }
  });

  it('caps the peak and stays dark while disabled', () => {
    expect(strikes(120).peak).toBeLessThanOrEqual(LIGHTNING.peak + 1e-9);
    expect(strikes(120, 0).onsets).toHaveLength(0);
    expect(strikes(120, 0).peak).toBe(0);
  });

  it('settles before the first strike once the window opens', () => {
    const { onsets } = strikes(20);
    expect(onsets[0]).toBeGreaterThanOrEqual(LIGHTNING.settle - 1e-6);
  });

  it('holds the rate at a low frame rate too', () => {
    const { onsets } = strikes(300, 1, 0.1);
    for (let i = 1; i < onsets.length; i += 1) {
      expect(onsets[i]! - onsets[i - 1]!).toBeGreaterThanOrEqual(2.8);
    }
  });
});

describe('maintenance window meshes', () => {
  it('drops rain, packets and lightning on the lite tier but keeps the power-down', () => {
    const resources = new SceneResourceBag();
    const window = createMaintenanceWindow(resources);
    let state = window.update(0.95, 1, 0.016, 'lite');
    for (let i = 0; i < 200; i += 1) state = window.update(0.95, 1, 0.05, 'lite');
    expect(state.rain).toBe(0);
    expect(state.flash).toBe(0);
    expect(state.lightning).toBe(0);
    expect(state.dim).toBeGreaterThan(0.95);
    expect(state.relight).toBeGreaterThan(0.4);
    const packets = window.group.getObjectByName('maintenance-packets') as { visible: boolean };
    expect(packets.visible).toBe(false);
    resources.dispose();
  });

  it('eases out after the chapter and replays the same state when scrolled back', () => {
    const resources = new SceneResourceBag();
    const window = createMaintenanceWindow(resources);
    for (let i = 0; i < 100; i += 1) window.update(0.5, 1, 0.05, 'full');
    const forward = window.update(0.5, 1, 0.05, 'full');
    expect(forward.rain).toBeCloseTo(MAINTENANCE_RAIN_PEAK, 2);
    for (let i = 0; i < 100; i += 1) window.update(0.8, 1, 0.05, 'full');
    for (let i = 0; i < 100; i += 1) window.update(0.5, -1, 0.05, 'full');
    const back = window.update(0.5, -1, 0.05, 'full');
    expect(back.reversing).toBe(true);
    expect(back.dim).toBeCloseTo(forward.dim, 3);
    expect(back.relight).toBeCloseTo(forward.relight, 3);
    expect(back.rain).toBeCloseTo(forward.rain, 3);
    for (let i = 0; i < 200; i += 1) window.update(null, 1, 0.05, 'full');
    const after = window.update(null, 1, 0.05, 'full');
    expect(after.presence).toBe(0);
    expect(after.dim).toBe(0);
    expect(after.rain).toBe(0);
    resources.dispose();
  });

  it('reports a rollback while progress falls', () => {
    const resources = new SceneResourceBag();
    const window = createMaintenanceWindow(resources);
    window.update(0.6, 1, 0.05, 'full');
    expect(window.update(0.55, -1, 0.05, 'full').reversing).toBe(true);
    expect(window.update(0.58, 1, 0.05, 'full').reversing).toBe(false);
    resources.dispose();
  });
});