import { afterEach, describe, expect, it, vi } from 'vitest';
import {
  cancelDashcamCapture,
  readDashcam,
  requestDashcamCapture,
  setDashcamOpen,
  setDashcamPointer,
  takeDashcamCapture,
} from '@/journey/dashcam-feed';
import { DASHCAM_LENS, createDashcamLens, driftTarget } from '@/scene/world/dashcam-lens';
import {
  dashcamClock,
  dashcamTitle,
  frameBottomLeft,
  frameTopLeft,
  postcardCredit,
  postcardFilename,
  routePercent,
  type DashcamTelemetry,
} from '@/lib/dashcam-postcard';
import { attachMusicPulse, createPulseTap, readSwitchboard, setMusicPulseAudible } from '@/audio/music-pulse';
import { playShutterClick } from '@/audio/switchboard-click';

afterEach(() => {
  setDashcamOpen(false, false);
  setMusicPulseAudible(false);
  attachMusicPulse(null);
});

describe('dashcam feed', () => {
  it('opens with drift only when asked, and resets the pointer on every change', () => {
    setDashcamOpen(true, true);
    setDashcamPointer(0.5, -0.25, 100);
    expect(readDashcam()).toMatchObject({ open: true, drift: true, px: 0.5, py: -0.25, movedAt: 100 });
    setDashcamOpen(false, true);
    expect(readDashcam()).toMatchObject({ open: false, drift: false, px: 0, py: 0 });
    setDashcamOpen(true, false);
    expect(readDashcam().drift).toBe(false);
  });

  it('clamps the pointer to [-1, 1]', () => {
    setDashcamOpen(true, true);
    setDashcamPointer(4, -9, 0);
    expect(readDashcam()).toMatchObject({ px: 1, py: -1 });
  });

  it('hands a capture to the scene exactly once', () => {
    const resolve = vi.fn();
    requestDashcamCapture(resolve);
    expect(takeDashcamCapture()).toBe(resolve);
    expect(takeDashcamCapture()).toBeNull();
  });

  it('drops a queued capture on cancel and on close', () => {
    requestDashcamCapture(vi.fn());
    cancelDashcamCapture();
    expect(takeDashcamCapture()).toBeNull();
    setDashcamOpen(true, false);
    requestDashcamCapture(vi.fn());
    setDashcamOpen(false, false);
    expect(takeDashcamCapture()).toBeNull();
  });
});

describe('dashcam lens', () => {
  const feed = (overrides: Partial<ReturnType<typeof readDashcam>> = {}) => ({
    open: true, drift: true, px: 1, py: 1, movedAt: 0, ...overrides,
  });

  it('targets the pointer while open with drift, centre otherwise', () => {
    expect(driftTarget(feed({ px: 0.4, py: -0.6 }), 10)).toEqual({ x: 0.4, y: -0.6 });
    expect(driftTarget(feed({ px: 7, py: -7 }), 10)).toEqual({ x: 1, y: -1 });
    expect(driftTarget(feed({ open: false }), 10)).toEqual({ x: 0, y: 0 });
    expect(driftTarget(feed({ drift: false }), 10)).toEqual({ x: 0, y: 0 });
  });

  it('returns to centre after 3 s without pointer movement', () => {
    expect(driftTarget(feed(), DASHCAM_LENS.idleMs)).toEqual({ x: 1, y: 1 });
    expect(driftTarget(feed(), DASHCAM_LENS.idleMs + 1)).toEqual({ x: 0, y: 0 });
  });

  it('eases the drift and never exceeds +-1.6 x and +-0.5 target height', () => {
    const lens = createDashcamLens();
    const first = { ...lens.update(feed(), 1 / 60, 0) };
    expect(first.x).toBeGreaterThan(0);
    expect(first.x).toBeLessThan(DASHCAM_LENS.driftX * 0.1);
    let state = first;
    for (let i = 0; i < 600; i += 1) state = lens.update(feed(), 1 / 60, 0);
    expect(state.x).toBeCloseTo(1.6, 3);
    expect(state.targetY).toBeCloseTo(-0.5, 3);
    for (let i = 0; i < 600; i += 1) state = lens.update(feed({ px: -1, py: -1 }), 1 / 60, 0);
    expect(state.x).toBeGreaterThanOrEqual(-1.6);
    expect(state.targetY).toBeLessThanOrEqual(0.5);
  });

  it('closes the letterbox to 0.16 over 400 ms and opens it again', () => {
    const lens = createDashcamLens();
    expect(lens.update(feed(), 0.2, 0).letterbox).toBeCloseTo(0.08, 5);
    expect(lens.update(feed(), 0.2, 0).letterbox).toBeCloseTo(0.16, 5);
    expect(lens.update(feed({ open: false }), 0.2, 0).letterbox).toBeCloseTo(0.08, 5);
    expect(lens.update(feed({ open: false }), 0.2, 0).letterbox).toBe(0);
  });

  it('snaps the bars and holds centre without drift (touch, low tier)', () => {
    const lens = createDashcamLens();
    const open = lens.update(feed({ drift: false }), 1 / 60, 0);
    expect(Math.abs(open.x) + Math.abs(open.targetY)).toBe(0);
    expect(open.letterbox).toBeCloseTo(0.16, 10);
    expect(lens.update(feed({ open: false, drift: false }), 1 / 60, 0).letterbox).toBe(0);
  });
});

describe('dashcam telemetry', () => {
  const telemetry: DashcamTelemetry = {
    sectionId: 'infrastructure',
    sectionLabel: 'Infrastructure',
    chapter: 'pre-dawn',
    exit: '04',
    routePercent: 45,
    clock: '03:51',
    name: 'Luca Pîslaru',
    city: 'Bucharest',
  };

  it('formats the document title', () => {
    expect(dashcamTitle(telemetry)).toBe('DASHCAM · 45% · INFRASTRUCTURE · 03:51');
  });

  it('formats the frame plates and the credit', () => {
    expect(frameTopLeft(telemetry)).toBe('DASHCAM · EXIT 04');
    expect(frameBottomLeft(telemetry)).toBe('ROUTE 45% · INFRASTRUCTURE');
    expect(postcardCredit(telemetry.name, telemetry.city)).toBe('NIGHT SHIFT · LUCA PÎSLARU · BUCHAREST');
  });

  it('rounds and clamps route progress on the tab title\'s 5% step', () => {
    expect(routePercent(0.474)).toBe(45);
    expect(routePercent(0.476)).toBe(50);
    expect(routePercent(1.4)).toBe(100);
    expect(routePercent(-1)).toBe(0);
    expect(routePercent(Number.NaN)).toBe(0);
  });

  it('names the postcard after the section and the clock', () => {
    expect(postcardFilename('infrastructure', '03:51')).toBe('night-shift-infrastructure-0351.png');
    expect(postcardFilename('selected-builds', '23:05')).toBe('night-shift-selected-builds-2305.png');
    expect(postcardFilename('', '7:5')).toBe('night-shift-route-0075.png');
  });

  it('uses the live Bucharest clock outside the maintenance window', () => {
    const now = new Date('2026-01-15T01:51:00Z');
    expect(dashcamClock('profile', null, now)).toBe('03:51');
    expect(dashcamClock('infrastructure', null, now)).toBe('03:51');
  });
});

describe('switchboard click', () => {
  it('stays silent and creates nothing without an audible soundtrack', () => {
    expect(readSwitchboard()).toBeNull();
    expect(playShutterClick()).toBe(false);
  });

  it('plays into the mix bus at the switchboard gain when audible', () => {
    const gains: { gain: { setValueAtTime: ReturnType<typeof vi.fn>; linearRampToValueAtTime: ReturnType<typeof vi.fn>; exponentialRampToValueAtTime: ReturnType<typeof vi.fn> }; connect: ReturnType<typeof vi.fn>; disconnect: ReturnType<typeof vi.fn> }[] = [];
    const context = {
      state: 'running',
      sampleRate: 1000,
      currentTime: 2,
      createGain: () => {
        const node = {
          gain: { value: 1, setValueAtTime: vi.fn(), linearRampToValueAtTime: vi.fn(), exponentialRampToValueAtTime: vi.fn() },
          connect: vi.fn(),
          disconnect: vi.fn(),
          context: undefined as unknown,
        };
        node.context = context;
        gains.push(node);
        return node;
      },
      createAnalyser: () => { throw new Error('no analyser'); },
      createBuffer: (_c: number, length: number) => ({ getChannelData: () => new Float32Array(length) }),
      createBufferSource: () => ({ connect: vi.fn(), disconnect: vi.fn(), start: vi.fn(), stop: vi.fn(), buffer: null, onended: null }),
    };
    const destination = {} as AudioNode;
    createPulseTap(context as unknown as BaseAudioContext, destination);
    expect(readSwitchboard()).toBeNull();
    setMusicPulseAudible(true);
    const bus = readSwitchboard();
    expect(bus).toBe(gains[0]);
    expect(playShutterClick()).toBe(true);
    const envelope = gains[1]!;
    expect(envelope.connect).toHaveBeenCalledWith(bus);
    expect(envelope.gain.linearRampToValueAtTime).toHaveBeenCalledWith(0.18, expect.any(Number));
    attachMusicPulse(null);
    expect(readSwitchboard()).toBeNull();
  });
});