<template>
  <div>
    <div id="chart">
      <apexchart
        type="bar"
        height="380"
        :options="chartOptions"
        :series="series"
      ></apexchart>
    </div>
  </div>
</template>

<script>
import VueApexCharts from 'vue-apexcharts'

// quarter label from a 'YYYY/MM/DD' date string, no external date library
function quarterOf(val) {
  return Math.floor(new Date(val).getMonth() / 3) + 1
}

export default {
  components: {
    apexchart: VueApexCharts,
  },
  data: function () {
    return {
      series: [
        {
          name: 'Revenue',
          data: [
            {
              x: '2024/01/01',
              y: 400,
            },
            {
              x: '2024/04/01',
              y: 430,
            },
            {
              x: '2024/07/01',
              y: 448,
            },
            {
              x: '2024/10/01',
              y: 470,
            },
            {
              x: '2025/01/01',
              y: 540,
            },
            {
              x: '2025/04/01',
              y: 580,
            },
            {
              x: '2025/07/01',
              y: 690,
            },
            {
              x: '2025/10/01',
              y: 690,
            },
          ],
        },
      ],
      chartOptions: {
        chart: {
          type: 'bar',
          height: 380,
        },
        xaxis: {
          type: 'category',
          labels: {
            formatter: function (val) {
              return 'Q' + quarterOf(val)
            },
          },
          group: {
            style: {
              fontSize: '10px',
              fontWeight: 700,
            },
            groups: [
              { title: '2024', cols: 4 },
              { title: '2025', cols: 4 },
            ],
          },
        },
        title: {
          text: 'Quarterly Revenue',
        },
        yaxis: {
          labels: {
            formatter: function (val) {
              return '$' + val + 'k'
            },
          },
        },
        tooltip: {
          x: {
            formatter: function (val) {
              return 'Q' + quarterOf(val) + ' ' + new Date(val).getFullYear()
            },
          },
        },
      },
    }
  },
}
</script>

<style>
#chart {
  max-width: 650px;
  margin: 35px auto;
}
</style>