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 = 0x77081a3b
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 = (i + 1).toString()
    var y = Math.floor(rand() * (yrange.max - yrange.min + 1)) + yrange.min

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

var data = [
  {
    name: 'W1',
    data: generateData(8, {
      min: 0,
      max: 90,
    }),
  },
  {
    name: 'W2',
    data: generateData(8, {
      min: 0,
      max: 90,
    }),
  },
  {
    name: 'W3',
    data: generateData(8, {
      min: 0,
      max: 90,
    }),
  },
  {
    name: 'W4',
    data: generateData(8, {
      min: 0,
      max: 90,
    }),
  },
  {
    name: 'W5',
    data: generateData(8, {
      min: 0,
      max: 90,
    }),
  },
  {
    name: 'W6',
    data: generateData(8, {
      min: 0,
      max: 90,
    }),
  },
  {
    name: 'W7',
    data: generateData(8, {
      min: 0,
      max: 90,
    }),
  },
  {
    name: 'W8',
    data: generateData(8, {
      min: 0,
      max: 90,
    }),
  },
  {
    name: 'W9',
    data: generateData(8, {
      min: 0,
      max: 90,
    }),
  },
  {
    name: 'W10',
    data: generateData(8, {
      min: 0,
      max: 90,
    }),
  },
  {
    name: 'W11',
    data: generateData(8, {
      min: 0,
      max: 90,
    }),
  },
  {
    name: 'W12',
    data: generateData(8, {
      min: 0,
      max: 90,
    }),
  },
  {
    name: 'W13',
    data: generateData(8, {
      min: 0,
      max: 90,
    }),
  },
  {
    name: 'W14',
    data: generateData(8, {
      min: 0,
      max: 90,
    }),
  },
  {
    name: 'W15',
    data: generateData(8, {
      min: 0,
      max: 90,
    }),
  },
]

data.reverse()

var colors = [
  '#F3B415',
  '#F27036',
  '#663F59',
  '#6A6E94',
  '#4E88B4',
  '#00A7C6',
  '#18D8D8',
  '#A9D794',
  '#46AF78',
  '#A93F55',
  '#8C5E58',
  '#2176FF',
  '#33A1FD',
  '#7A918D',
  '#BAFF29',
]

colors.reverse()

const ApexChart = () => {
  const [state, setState] = React.useState({
    series: data,
    options: {
      chart: {
        height: 450,
        type: 'heatmap',
      },
      dataLabels: {
        enabled: false,
      },
      colors: colors,
      xaxis: {
        type: 'category',
        categories: [
          '10:00',
          '10:30',
          '11:00',
          '11:30',
          '12:00',
          '12:30',
          '13:00',
          '13:30',
        ],
      },
      title: {
        text: 'Room Occupancy by Week & Time (per-row colors)',
      },
      grid: {
        padding: {
          right: 20,
        },
      },
    },
  })

  return (
    <div>
      <div id="chart">
        <ReactApexChart
          options={state.options}
          series={state.series}
          type="heatmap"
          height={450}
        />
      </div>
    </div>
  )
}

export default ApexChart