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

const { TIMES } = require('../../constants');

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

    render() {
        const path = 'M0,100 C100,100 100,100 200,100';

        return (
            <svg
                class='skill-animation'
                version="1.1"
                id="amplify"
                xmlns="http://www.w3.org/2000/svg"
                viewBox="0 0 200 200">
                <filter id="amplifyFilter">
                    <feTurbulence type="turbulence" baseFrequency="0.4" numOctaves="2" result="turbulence"></feTurbulence>
                    <feDisplacementMap in2="turbulence" in="SourceGraphic" scale="2" xChannelSelector="R" yChannelSelector="G"></feDisplacementMap>
                </filter>
                <path filter='url("#amplifyFilter")' d={path} />
            </svg>
        );
    }

    componentDidMount() {
        const altPath = 'M0,100 C100,400 100,-200 200,100';

        this.animations.push(anime({
            targets: ['#amplify'],
            opacity: [
                { value: 1, delay: TIMES.TARGET_DELAY_MS, duration: TIMES.TARGET_DURATION_MS * 0.2 },
                { value: 0, delay: TIMES.TARGET_DURATION_MS * 0.6, duration: TIMES.TARGET_DURATION_MS * 0.2 },
            ],
            easing: 'easeInOutSine',
        }));

        this.animations.push(anime({
            targets: ['#amplify path'],
            d: [{ value: altPath }],
            stroke: ['#3498db', '#a52a2a'],
            easing: 'easeInOutSine',

            delay: TIMES.TARGET_DELAY_MS,
            duration: TIMES.TARGET_DURATION_MS,
        }));

        this.animations.push(anime({
            targets: ['#amplifyFilter feTurbulence', '#amplifyFilter feDisplacementMap'],
            baseFrequency: 0.15,
            scale: 4,
            easing: 'easeInOutExpo',

            delay: TIMES.TARGET_DELAY_MS,
            duration: TIMES.TARGET_DURATION_MS,
        }));
    }

    // 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 = Amplify;