const preact = require('preact');
const { Component } = require('preact');
const anime = require('animejs').default;

class Noise extends Component {
    constructor() {
        super();
        this.animations = [];
    }

    render() {
        return (
            <svg
                version="1.1"
                id="noise"
                xmlns="http://www.w3.org/2000/svg"
                viewBox="0 0 400 400">
                <filter id='noiseFilter'>
                    <feTurbulence type="turbulence" baseFrequency="0.2" numOctaves="2" result="turbulence"></feTurbulence>
                    <feDisplacementMap in2="turbulence" in="SourceGraphic" scale="2" xChannelSelector="R" yChannelSelector="G"></feDisplacementMap>
                </filter>
            </svg>
        );
    }

    componentDidMount() {
        this.animations.push(anime({
            targets: ['#noiseFilter feTurbulence', '#noiseFilter feDisplacementMap'],
            easing: 'linear',
            loop: true,
            keyframes: [
                {
                    baseFrequency: 0.5,
                    duration: () => anime.random(1000, 2000),
                },
            ],
        }));

        this.animations.push(anime({
            targets: ['#noiseFilter feDisplacementMap'],
            easing: 'linear',
            loop: true,
            keyframes: [
                {
                    scale: 2,
                    duration: () => anime.random(2000, 5000),
                },
                {
                    scale: 4,
                    duration: () => anime.random(150, 250),
                },
                {
                    scale: 2,
                    duration: () => anime.random(100, 150),
                },
                {
                    scale: 4,
                    duration: () => anime.random(150, 250),
                },
            ],
        }));
    }

    // this is necessary because
    // skipping / timing / unmounting race conditions
    // can cause the animations to cut short, this will ensure the values are reset
    // because preact will recycle all these components
    componentWillUnmount() {
        for (let i = this.animations.length - 1; i >= 0; i--) {
            this.animations[i].reset();
        }
    }
}

module.exports = Noise;