import {useState, useEffect} from './react';
import {on, off} from './util';

export interface MotionSensorState {
  acceleration: {
    x: number | null,
    y: number | null,
    z: number | null,
  },
  accelerationIncludingGravity: {
    x: number | null,
    y: number | null,
    z: number | null,
  },
  rotationRate: {
    alpha: number | null,
    beta: number | null,
    gamma: number | null,
  },
  interval: number | null,
}

const defaultState: MotionSensorState = {
  acceleration: {
    x: null,
    y: null,
    z: null,
  },
  accelerationIncludingGravity: {
    x: null,
    y: null,
    z: null,
  },
  rotationRate: {
    alpha: null,
    beta: null,
    gamma: null,
  },
  interval: 16,
};

const useMotion = (initialState: MotionSensorState = defaultState) => {
  const [state, setState] = useState(initialState);

  useEffect(() => {
    const handler = (event) => {
      const {
        acceleration,
        accelerationIncludingGravity,
        rotationRate,
        interval
      } = event;
    
      setState({
        acceleration: {
          x: acceleration.x,
          y: acceleration.y,
          z: acceleration.z
        },
        accelerationIncludingGravity: {
          x: accelerationIncludingGravity.x,
          y: accelerationIncludingGravity.y,
          z: accelerationIncludingGravity.z
        },
        rotationRate: {
          alpha: rotationRate.alpha,
          beta: rotationRate.beta,
          gamma: rotationRate.gamma,
        },
        interval
      });
    };

    on(window, 'devicemotion', handler);

    return () => {
      off(window, 'devicemotion', handler);
    };
  }, [0]);

  return state;
};

export default useMotion;