import React from 'react'
import ReactApexChart from 'react-apexcharts'
import './styles.css'

// Seeded PRNG so the heatmap is identical on every load (stable snapshots).
var __seed = 0x11a2c3d4
function rand() {
  __seed |= 0
  __seed = (__seed + 0x6d2b79f5) | 0
  var t = Math.imul(__seed ^ (__seed >>> 15), 1 | __seed)
  t = (t + Math.imul(t ^ (t >>> 7), 61 | t)) ^ t
  return ((t ^ (t >>> 14)) >>> 0) / 4294967296
}

function generateData(count, yrange) {
  var i = 0
  var series = []
  while (i < count) {
    var x = 'w' + (i + 1).toString()
    var y = Math.floor(rand() * (yrange.max - yrange.min + 1)) + yrange.min

    series.push({
      x: x,
      y: y,
    })
    i++
  }
  return series
}

const ApexChart = () => {
  const [state, setState] = React.useState({
    series: [
      {
        name: 'Dashboard',
        data: generateData(18, {
          min: 0,
          max: 90,
        }),
      },
      {
        name: 'Reports',
        data: generateData(18, {
          min: 0,
          max: 90,
        }),
      },
      {
        name: 'Search',
        data: generateData(18, {
          min: 0,
          max: 90,
        }),
      },
      {
        name: 'Profile',
        data: generateData(18, {
          min: 0,
          max: 90,
        }),
      },
      {
        name: 'Billing',
        data: generateData(18, {
          min: 0,
          max: 90,
        }),
      },
      {
        name: 'Settings',
        data: generateData(18, {
          min: 0,
          max: 90,
        }),
      },
      {
        name: 'Inbox',
        data: generateData(18, {
          min: 0,
          max: 90,
        }),
      },
      {
        name: 'Calendar',
        data: generateData(18, {
          min: 0,
          max: 90,
        }),
      },
      {
        name: 'Files',
        data: generateData(18, {
          min: 0,
          max: 90,
        }),
      },
    ],
    options: {
      chart: {
        height: 350,
        type: 'heatmap',
      },
      dataLabels: {
        enabled: false,
      },
      colors: ['#008FFB'],
      title: {
        text: 'Feature Usage by Week (single color)',
      },
    },
  })

  return (
    <div>
      <div id="chart">
        <ReactApexChart
          options={state.options}
          series={state.series}
          type="heatmap"
          height={350}
        />
      </div>
    </div>
  )
}

export default ApexChart