export class SensoryDiceRoller {
  constructor(onRoll) {
    this.onRoll = onRoll;
    this.samples = [];
    this.isSampling = false;
    this.timer = null;
    this.init();
  }

  mulberry32(a) {
    return function() {
      let t = a += 0x6D2B79F5;
      t = Math.imul(t ^ t >>> 15, t | 1);
      t ^= t + Math.imul(t ^ t >>> 7, t | 61);
      return ((t ^ t >>> 14) >>> 0) / 4294967296;
    };
  }

  init() {
    if (window.DeviceMotionEvent) {
      window.addEventListener('devicemotion', (e) => this.handleMotion(e));
    }
    window.addEventListener('mousemove', (e) => this.handleMouse(e));
  }

  startSequence() {
    this.samples = [];
    this.isSampling = true;

    this.timer = setTimeout(() => {
      if (this.isSampling) {
        this.triggerRoll(Math.floor(Math.random() * 0xFFFFFFFF));
      }
    }, 5000);
  }

  handleMotion(e) {
    if (!this.isSampling) return;
    const { x, y, z } = e.accelerationIncludingGravity || {};
    if (x && y && z) {
      this.samples.push(Math.sqrt(x*x + y*y + z*z));
      this.check();
    }
  }

  handleMouse(e) {
    if (!this.isSampling) return;
    const v = Math.sqrt(e.movementX**2 + e.movementY**2);
    this.samples.push(v);
    this.check();
  }

  check() {
    if (this.samples.length >= 30) {
      clearTimeout(this.timer);
      const seed = this.samples.reduce((a, b) => a + Math.floor(b * 1000), 0);
      this.triggerRoll(seed);
    }
  }

  triggerRoll(seed) {
    this.isSampling = false;
    const rng = this.mulberry32(seed);
    const result = Math.floor(rng() * 20) + 1;
    this.onRoll(result);
  }
}