/* Imports */
import { Slider, Rail, Handles, Tracks, Ticks } from "react-compound-slider";
import React, { useState } from 'react';
// https://sghall.github.io/react-compound-slider/#/getting-started/tutorial

/* Definitions */

const sliderStyle = {  // Give the slider some width
  position: 'relative',
  width: '40em',
  height: 40,
  border: '5em',
}

const railStyle = {
  position: 'absolute',
  width: '100%',
  height: 15,
  marginTop: 30,
  borderRadius: 5,
  backgroundColor: 'lightgrey',
}

/* Support functions */
function Handle({
  handle: { id, value, percent },
  getHandleProps,
  displayFunction,
  handleWidth
}) {

  return (
    <>
      <div className="justify-center text-center text-gray-600 text-xs">
        {displayFunction(value)}
      </div>
      <div
        style={{
          left: `${percent}%`,
          position: 'absolute',
          marginLeft: -10,
          marginTop: 0,
          zIndex: 2,
          width: 30,
          height: 30,
          cursor: 'pointer',
          borderRadius: '50%',
          backgroundColor: '#374151',
          color: '#374151',
        }}
        {...getHandleProps(id)}
      >
      </div>
    </>
  )
}

function Track({ source, target, getTrackProps }) {
  return (
    <div
      style={{
        position: 'absolute',
        height: 15,
        zIndex: 1,
        marginTop: 7,
        backgroundColor: ' #3B82F6',
        borderRadius: 5,
        cursor: 'pointer',
        left: `${source.percent}%`,
        width: `${target.percent - source.percent}%`,
      }}
      {...getTrackProps() /* this will set up events if you want it to be clickeable (optional) */}
    />
  )
}

/* Body */
// Two functions, essentially identical. 
export function SliderElement({ onChange, value, displayFunction }) {

  return (
    <Slider
      rootStyle={sliderStyle /* inline styles for the outer div. Can also use className prop. */}
      domain={[-3,3]}
      values={[value]}
      onChange={onChange}
      reversed={true}
    >
      <Rail>
        {({ getRailProps }) => (
          <div style={railStyle} {...getRailProps()} />
        )}
      </Rail>
      <Handles>
        {({ handles, getHandleProps }) => (
          <div className="slider-handles">
            {handles.map(handle => (
              <Handle
                key={handle.id}
                handle={handle}
                getHandleProps={getHandleProps}
                displayFunction={displayFunction}
                handleWidth={"15em"}
              />
            ))}
          </div>
        )}
      </Handles>
      <Tracks right={false}>
        {({ tracks, getTrackProps }) => (
          <div className="slider-tracks">
            {tracks.map(({ id, source, target }) => (
              <Track
                key={id}
                source={source}
                target={target}
                getTrackProps={getTrackProps}
              />
            ))}
          </div>
        )}
      </Tracks>
    </Slider>
  )
}