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              @import url('https://fonts.googleapis.com/css?family=Roboto:300,400');

$secondary-color: #aaa;
$background-color: #440015;

html {
  background-color: #020202;
  font-family: 'Roboto', sans-serif;
}

#container {
  display: flex;
  flex-wrap: wrap;
  flex-direction: row;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  position: absolute;
  top: 0;
  left: 0;
}
#footer {
  display: flex;
  flex-wrap: wrap;
  flex-direction: column;
  align-items: center;
  justify-content: center;
}
#footer div {
  color: $secondary-color;
  padding: 20px;
  font-size: 15px;
  box-sizing: border-box;
  font-weight: 300;
  text-align: center;
  width: 360px;
}

@media only screen and (min-width: 1080px) and (min-height: 500px) {
  #footer {
    position: fixed;
    bottom: 50px;
    left: 10%; // This helps in Safari
    right: 10%;
    flex-direction: row;
  }
  #footer div {
    width: auto;
  }
}

svg {
  fill: none;
  stroke-width: 20px;
}

.marker {
  stroke-width: 40px;
}

text {
  font-size: 90px;
  stroke-width: 5px;
  user-select: none;
}
.label {
  font-size: 25px;
  stroke-width: 0;
}
            
          
!
            
              /*********
Display: React,
Event handling: Reactive JS
Status handling: Redux
**********/

/*********
* REACT
**********/
const Container = ({hue, saturation, lightness, red, green, blue, hex, setHue, setSaturation, setLightness}) => {
  return <div id='container'>
    <Hue hue={hue} saturation={saturation} lightness={lightness} setHue={setHue} />
    <Saturation hue={hue} saturation={saturation} lightness={lightness} setSaturation={setSaturation} />
    <Lightness hue={hue} saturation={saturation} lightness={lightness} setLightness={setLightness} />
    <div id='footer'>
      <div>
        {`hsl(${hue}, ${saturation}%, ${lightness}%)`}
      </div>
      <div>
        {`rgb(${red}, ${green}, ${blue})`}
      </div>
      <div>
        {hex}
      </div>
    </div>
  </div>;
}

class Hue extends React.Component {
  constructor({hue, saturation, lightness, setHue}) {
    super({hue, saturation, lightness, setHue});
    
    const padding = 60;
    const innerSize = 300;
    this.radius = innerSize/2;
    this.outterSize = innerSize + padding;
    this.centerOffset = this.outterSize/2;
    
    this.state = {
      dragging: false
    }
    
    // These are set in the render method
    this.canvas = null;
    this.selector = null;
  }

  render() {
    return (
      <svg ref={(canvas) => { this.canvas = canvas; }}
        width={this.outterSize} height={this.outterSize} 
        viewBox={`0 0 ${this.outterSize} ${this.outterSize}`} 
        xmlns="http://www.w3.org/2000/svg" version="1.1">
        <g transform={`translate(${this.centerOffset},${this.centerOffset})`}>
          {Array.from({length: 360}, (value, key) => (
            <HueSlice 
              degree={key}
              radius={this.radius} 
              color={`hsl(${key}, ${this.props.saturation}%, ${this.props.lightness}%)`}
              marker={false} />
          ))}
          <g ref={(selector) => { this.selector = selector; }}>
            <HueSlice 
              degree={this.props.hue}
              radius={this.radius}
              color={this.state.dragging ? `hsl(${this.props.hue}, ${this.props.saturation}%, ${this.props.lightness}%)` : "white"}
              marker={true}/>
          </g>
          <text 
            x="10" 
            y="30"
            textAnchor="middle" 
            fill={`hsl(${this.props.hue}, ${this.props.saturation}%, ${this.props.lightness}%)`} 
            stroke={`hsl(${this.props.hue}, ${this.props.saturation}%, ${this.props.lightness}%)`}>
            {this.props.hue}°
          </text>
          <text 
            className="label"
            x="0" 
            y="60"
            textAnchor="middle" 
            fill={`hsl(${this.props.hue}, ${this.props.saturation}%, ${this.props.lightness}%)`} 
            stroke={`hsl(${this.props.hue}, ${this.props.saturation}%, ${this.props.lightness}%)`}>
            Hue
          </text>
        </g>
      </svg>
   
    );
  }
  
  componentDidMount() {
    // Event handling using Reactive JS
    let mouseDowns = Rx.Observable.fromEvent(this.selector, "mousedown");
    let mouseMoves = Rx.Observable.fromEvent(this.canvas, "mousemove");
    let mouseUps = Rx.Observable.fromEvent(this.canvas, "mouseup");
    let mouseLeaves = Rx.Observable.fromEvent(this.canvas, "mouseleave");
    
    let touchStarts = Rx.Observable.fromEvent(this.selector, "touchstart");
    let touchMoves = Rx.Observable.fromEvent(this.selector, "touchmove");
    let touchEnds = Rx.Observable.fromEvent(this.canvas, "touchend");
    
    let mouseDrags = mouseDowns.concatMap(clickEvent => {
      const xMouseShouldBe = Math.sin(this.props.hue/180*Math.PI)*this.radius;
      const yMouseShouldBe = -Math.cos(this.props.hue/180*Math.PI)*this.radius;
      const xMouseIs = clickEvent.clientX;
      const yMouseIs = clickEvent.clientY;
      const xMouseDelta = xMouseIs - xMouseShouldBe;
      const yMouseDelta = yMouseIs - yMouseShouldBe;
      return mouseMoves.takeUntil(mouseUps.merge(mouseLeaves)).map(moveEvent => {
        const xRelativeToCenter = moveEvent.clientX-xMouseDelta;
        const yRelativeToCenter = moveEvent.clientY-yMouseDelta;
        const degree = Math.atan(yRelativeToCenter/xRelativeToCenter)*180/Math.PI + 90 + (xRelativeToCenter>=0 ? 0 : 180);
        return parseInt(degree);
      })
    });
    
    let touchDrags = touchStarts.concatMap(startEvent => {
      startEvent.preventDefault();
      const xTouchShouldBe = Math.sin(this.props.hue/180*Math.PI)*this.radius;
      const yTouchShouldBe = -Math.cos(this.props.hue/180*Math.PI)*this.radius;
      const xTouchIs = startEvent.touches[0].clientX;
      const yTouchIs = startEvent.touches[0].clientY;
      const xTouchDelta = xTouchIs - xTouchShouldBe;
      const yTouchDelta = yTouchIs - yTouchShouldBe;
      return touchMoves.takeUntil(touchEnds).map(moveEvent => {
        moveEvent.preventDefault();
        const xRelativeToCenter = moveEvent.touches[0].clientX-xTouchDelta;
        const yRelativeToCenter = moveEvent.touches[0].clientY-yTouchDelta;
        const degree = Math.atan(yRelativeToCenter/xRelativeToCenter)*180/Math.PI + 90 + (xRelativeToCenter>=0 ? 0 : 180);
        return parseInt(degree);
      })
    });
    
    let dragStarts = mouseDowns.merge(touchStarts);
    let drags = mouseDrags.merge(touchDrags);
    let dragEnds = mouseUps.merge(mouseLeaves).merge(touchEnds);
    
    dragStarts.forEach(() => {
      this.setState({dragging: true});
    });
    
    drags.forEach(degree => {
      this.props.setHue(degree);
    });
    
    dragEnds.forEach(() => {
      this.setState({dragging: false});
    });
  }
}

const HueSlice = ({degree, color, radius, marker}) => {
  const thickness = marker ? 5 : 1;
  const startX  =   Math.sin((degree-thickness)/180*Math.PI)*radius;
  const startY  = - Math.cos((degree-thickness)/180*Math.PI)*radius;
  const endX    =   Math.sin((degree+thickness)/180*Math.PI)*radius;
  const endY    = - Math.cos((degree+thickness)/180*Math.PI)*radius;
  return <path 
           className={marker && 'marker'} 
           d={`M ${startX} ${startY} A ${radius} ${radius} 0 0 1 ${endX} ${endY}`} 
           stroke={color} /> 
}

const Saturation = ({hue, saturation, lightness, setSaturation}) => {
  const gradient = <linearGradient id="Saturation" x1="0" x2="0" y1="0" y2="1">
            <stop offset="0%" stopColor={`hsl(${hue}, 100%, ${lightness}%)`}/>
            <stop offset="100%" stopColor={`hsl(${hue}, 0%, ${lightness}%)`}/>
          </linearGradient>;
  return <Percentage 
    type="Saturation" value={saturation} gradient={gradient}
    hue={hue} saturation={saturation} lightness={lightness} 
    set={setSaturation} />
}

const Lightness = ({hue, saturation, lightness, setLightness}) => {
  const gradient = <linearGradient id="Lightness" x1="0" x2="0" y1="0" y2="1">
            <stop offset="0%" stopColor={`hsl(${hue}, ${saturation}%, 100%)`}/>
            <stop offset="50%" stopColor={`hsl(${hue}, ${saturation}%, 50%)`}/>
            <stop offset="100%" stopColor={`hsl(${hue}, ${saturation}%, 0%)`}/>
          </linearGradient>;
  return <Percentage 
    type="Lightness" value={lightness} gradient={gradient}
    hue={hue} saturation={saturation} lightness={lightness} 
    set={setLightness} />
}

class Percentage extends React.Component {
  constructor({type, value, gradient, hue, saturation, lightness, set}) {
    super({type, value, gradient, hue, saturation, lightness, set});
    
    const padding = 60;
    this.padding = padding/2;
    const innerSize = 300;
    this.innerSize = innerSize;
    this.outterSize = innerSize + padding;
    this.barOffsetX = innerSize - 20;
    
    this.state = {
      dragging: false
    }
    
    // These are set in the render method
    this.canvas = null;
    this.selector = null;
  }

  render() {
    return (
      <svg ref={(canvas) => { this.canvas = canvas; }}
        width={this.outterSize} height={this.outterSize} 
        viewBox={`0 0 ${this.outterSize} ${this.outterSize}`} 
        xmlns="http://www.w3.org/2000/svg" version="1.1">
        <defs>
          {this.props.gradient}
        </defs>
        <g transform={`translate(${this.padding},${this.padding})`}>
          <rect x={this.barOffsetX} y="0" 
            width="20" height={this.innerSize} 
            strokeWidth="20" 
            fill={`url(#${this.props.type})`}/>
          <g ref={(selector) => { this.selector = selector; }}>
            <rect x={this.barOffsetX-10} y={this.innerSize*(1-this.props.value/100) -25/2} 
              width="40" height="25" 
              strokeWidth="20" 
              fill={this.state.dragging ? `hsl(${this.props.hue}, ${this.props.saturation}%, ${this.props.lightness}%)` : "white"}/>
          </g>
          <text 
            x="130" 
            y="180"
            textAnchor="middle" 
            fill={`hsl(${this.props.hue}, ${this.props.saturation}%, ${this.props.lightness}%)`} 
            stroke={`hsl(${this.props.hue}, ${this.props.saturation}%, ${this.props.lightness}%)`}>
            {this.props.value}%
          </text>
          <text 
            className="label"
            x="130" 
            y="210"
            textAnchor="middle" 
            fill={`hsl(${this.props.hue}, ${this.props.saturation}%, ${this.props.lightness}%)`} 
            stroke={`hsl(${this.props.hue}, ${this.props.saturation}%, ${this.props.lightness}%)`}>
            {this.props.type}
          </text>
        </g>
      </svg>
   
    );
  }
  
  componentDidMount() {
    // Event handling using Reactive JS
    let mouseDowns = Rx.Observable.fromEvent(this.selector, "mousedown");
    let mouseMoves = Rx.Observable.fromEvent(this.canvas, "mousemove");
    let mouseUps = Rx.Observable.fromEvent(this.canvas, "mouseup");
    let mouseLeaves = Rx.Observable.fromEvent(this.canvas, "mouseleave");
    
    let touchStarts = Rx.Observable.fromEvent(this.selector, "touchstart");
    let touchMoves = Rx.Observable.fromEvent(this.selector, "touchmove");
    let touchEnds = Rx.Observable.fromEvent(this.canvas, "touchend");
    
    let mouseDrags = mouseDowns.concatMap(clickEvent => {
      const yMouseShouldBe = (1-this.props.value/100)*this.innerSize;
      const yMouseIs = clickEvent.clientY;
      const yMouseDelta = yMouseIs - yMouseShouldBe;
      return mouseMoves.takeUntil(mouseUps.merge(mouseLeaves)).map(moveEvent => {
        const y = moveEvent.clientY-yMouseDelta;
        let percentage = (1-y/this.innerSize)*100;
        percentage = Math.min(percentage, 100);
        percentage = Math.max(percentage, 0);
        return parseInt(percentage);
      })
    });
    
    let touchDrags = touchStarts.concatMap(startEvent => {
      startEvent.preventDefault();
      const yTouchShouldBe = (1-this.props.value/100)*this.innerSize;
      const yTouchIs = startEvent.touches[0].clientY;
      const yTouchDelta = yTouchIs - yTouchShouldBe;
      return touchMoves.takeUntil(touchEnds).map(moveEvent => {
        moveEvent.preventDefault();
        const y = moveEvent.touches[0].clientY-yTouchDelta;
        let percentage = (1-y/this.innerSize)*100;
        percentage = Math.min(percentage, 100);
        percentage = Math.max(percentage, 0);
        return parseInt(percentage);
      })
    });
    
    let dragStarts = mouseDowns.merge(touchStarts);
    let drags = mouseDrags.merge(touchDrags);
    let dragEnds = mouseUps.merge(mouseLeaves).merge(touchEnds);
   
    dragStarts.forEach(() => {
      this.setState({dragging: true});
    });
    
    drags.forEach(percentage => {
      this.props.set(percentage);
    });
    
    dragEnds.forEach(() => {
      this.setState({dragging: false});
    });
  }
}

/*********
* REDUX
**********/

const initialState = {
  hue: 158,
  saturation: 100,
  lightness: 53,
  red: 15,
  green: 255,
  blue: 167,
  hex: "#0FFFA7"
};

const hsl2rgb = (hue, saturation, lightness) => {
  saturation /= 100;
  lightness /= 100;
  const C = (1 - Math.abs(2*lightness - 1)) * saturation;
  const X = C * (1 - Math.abs((hue / 60) % 2 - 1));
  const m = lightness - C/2;
  let [R, G, B] = 
          0 <= hue && hue <  60 && [C, X, 0] ||
         60 <= hue && hue < 120 && [X, C, 0] ||
        120 <= hue && hue < 180 && [0, C, X] ||
        180 <= hue && hue < 240 && [0, X, C] ||
        240 <= hue && hue < 300 && [X, 0, C] ||
        300 <= hue && hue < 360 && [C, 0, X];
  [R, G, B] = [(R+m)*255, (G+m)*255, (B+m)*255];
  return [Math.round(R), Math.round(G), Math.round(B)];
}

const rgb2hex = (red, green, blue) => {
  red = red.toString(16).toUpperCase();
  green = green.toString(16).toUpperCase();
  blue = blue.toString(16).toUpperCase();
  red = red.length === 1 ? "0"+red : red;
  green = green.length === 1 ? "0"+green : green;
  blue = blue.length === 1 ? "0"+blue : blue;
  return `#${red}${green}${blue}`;
}

const mainReducer = (state = initialState, action) => {
  let red; 
  let green; 
  let blue;
  let hex;
  switch (action.type) {
    case 'HUE':
      [red, green, blue] = hsl2rgb(action.value, state.saturation, state.lightness);
      hex = rgb2hex(red, green, blue);
      return Object.assign({}, state, { hue: action.value, red, green, blue, hex });
    case 'SATURATION':
      [red, green, blue] = hsl2rgb(state.hue, action.value, state.lightness);
      hex = rgb2hex(red, green, blue);
      return Object.assign({}, state, { saturation: action.value, red, green, blue, hex });
    case 'LIGHTNESS':
      [red, green, blue] = hsl2rgb(state.hue, state.saturation, action.value);
      hex = rgb2hex(red, green, blue);
      return Object.assign({}, state, { lightness: action.value, red, green, blue, hex });
    default:
      return state;
  }
};

/* Import { createStore } from 'redux' */
const { createStore } = Redux;

const store = createStore(mainReducer);

/*********
* REACT-REDUX
**********/

const mapStateToProps = (state, ownProps) => {
  return {
    hue: state.hue,
    saturation: state.saturation,
    lightness: state.lightness,
    red: state.red,
    green: state.green,
    blue: state.blue,
    hex: state.hex
  }
}

const mapDispatchToProps = (dispatch, ownProps) => {
  return {
    setHue: (value) => {
      dispatch({
        type: 'HUE',
        value
      })
    },
    setSaturation: (value) => {
      dispatch({
        type: 'SATURATION',
        value
      })
    },
    setLightness: (value) => {
      dispatch({
        type: 'LIGHTNESS',
        value
      })
    }
  }
}

/* Import { connect, Provider } from 'react-redux' */
const { connect, Provider } = ReactRedux;

const ConnectedContainer = connect(mapStateToProps, mapDispatchToProps)(Container);

/*********
* REACT DOM + REDUX
**********/

ReactDOM.render(
  <Provider store={store}>
    <ConnectedContainer />
  </Provider>,
  document.getElementById('app')
);
            
          
!
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