<template>
  <div>
    <div id="chart">
      <apexchart
        type="line"
        height="350"
        :options="chartOptions"
        :series="series"
      ></apexchart>
    </div>
  </div>
</template>

<script>
import VueApexCharts from 'vue-apexcharts'

// OHLC candles + a moving-average overlay derived from their closes, so the
// line spans the whole series and actually means something (7-period SMA)
// instead of a few arbitrary points.
var candleData = [
  { x: new Date(1538778600000), y: [6629.81, 6650.5, 6623.04, 6633.33] },
  { x: new Date(1538780400000), y: [6632.01, 6643.59, 6620, 6630.11] },
  { x: new Date(1538782200000), y: [6630.71, 6648.95, 6623.34, 6635.65] },
  { x: new Date(1538784000000), y: [6635.65, 6651, 6629.67, 6638.24] },
  { x: new Date(1538785800000), y: [6638.24, 6640, 6620, 6624.47] },
  { x: new Date(1538787600000), y: [6624.53, 6636.03, 6621.68, 6624.31] },
  { x: new Date(1538789400000), y: [6624.61, 6632.2, 6617, 6626.02] },
  { x: new Date(1538791200000), y: [6627, 6627.62, 6584.22, 6603.02] },
  { x: new Date(1538793000000), y: [6605, 6608.03, 6598.95, 6604.01] },
  { x: new Date(1538794800000), y: [6604.5, 6614.4, 6602.26, 6608.02] },
  { x: new Date(1538796600000), y: [6608.02, 6610.68, 6601.99, 6608.91] },
  { x: new Date(1538798400000), y: [6608.91, 6618.99, 6608.01, 6612] },
  { x: new Date(1538800200000), y: [6612, 6615.13, 6605.09, 6612] },
  { x: new Date(1538802000000), y: [6612, 6624.12, 6608.43, 6622.95] },
  { x: new Date(1538803800000), y: [6623.91, 6623.91, 6615, 6615.67] },
  { x: new Date(1538805600000), y: [6618.69, 6618.74, 6610, 6610.4] },
  { x: new Date(1538807400000), y: [6611, 6622.78, 6610.4, 6614.9] },
  { x: new Date(1538809200000), y: [6614.9, 6626.2, 6613.33, 6623.45] },
  { x: new Date(1538811000000), y: [6623.48, 6627, 6618.38, 6620.35] },
  { x: new Date(1538812800000), y: [6619.43, 6620.35, 6610.05, 6615.53] },
  { x: new Date(1538814600000), y: [6615.53, 6617.93, 6610, 6615.19] },
  { x: new Date(1538816400000), y: [6615.19, 6621.6, 6608.2, 6620] },
  { x: new Date(1538818200000), y: [6619.54, 6625.17, 6614.15, 6620] },
  { x: new Date(1538820000000), y: [6620.33, 6634.15, 6617.24, 6624.61] },
  { x: new Date(1538821800000), y: [6625.95, 6626, 6611.66, 6617.58] },
  { x: new Date(1538823600000), y: [6619, 6625.97, 6595.27, 6598.86] },
  { x: new Date(1538825400000), y: [6598.86, 6598.88, 6570, 6587.16] },
  { x: new Date(1538827200000), y: [6588.86, 6600, 6580, 6593.4] },
  { x: new Date(1538829000000), y: [6593.99, 6598.89, 6585, 6587.81] },
  { x: new Date(1538830800000), y: [6587.81, 6592.73, 6567.14, 6578] },
  { x: new Date(1538832600000), y: [6578.35, 6581.72, 6567.39, 6579] },
  { x: new Date(1538834400000), y: [6579.38, 6580.92, 6566.77, 6575.96] },
  { x: new Date(1538836200000), y: [6575.96, 6589, 6571.77, 6588.92] },
  { x: new Date(1538838000000), y: [6588.92, 6594, 6577.55, 6589.22] },
  { x: new Date(1538839800000), y: [6589.3, 6598.89, 6589.1, 6596.08] },
  { x: new Date(1538841600000), y: [6597.5, 6600, 6588.39, 6596.25] },
  { x: new Date(1538843400000), y: [6598.03, 6600, 6588.73, 6595.97] },
  { x: new Date(1538845200000), y: [6595.97, 6602.01, 6588.17, 6602] },
  { x: new Date(1538847000000), y: [6602, 6607, 6596.51, 6599.95] },
  { x: new Date(1538848800000), y: [6600.63, 6601.21, 6590.39, 6591.02] },
  { x: new Date(1538850600000), y: [6591.02, 6603.08, 6591, 6591] },
  { x: new Date(1538852400000), y: [6591, 6601.32, 6585, 6592] },
  { x: new Date(1538854200000), y: [6593.13, 6596.01, 6590, 6593.34] },
  { x: new Date(1538856000000), y: [6593.34, 6604.76, 6582.63, 6593.86] },
  { x: new Date(1538857800000), y: [6593.86, 6604.28, 6586.57, 6600.01] },
  { x: new Date(1538859600000), y: [6601.81, 6603.21, 6592.78, 6596.25] },
  { x: new Date(1538861400000), y: [6596.25, 6604.2, 6590, 6602.99] },
  { x: new Date(1538863200000), y: [6602.99, 6606, 6584.99, 6587.81] },
  { x: new Date(1538865000000), y: [6587.81, 6595, 6583.27, 6591.96] },
  { x: new Date(1538866800000), y: [6591.97, 6596.07, 6585, 6588.39] },
  { x: new Date(1538868600000), y: [6587.6, 6598.21, 6587.6, 6594.27] },
  { x: new Date(1538870400000), y: [6596.44, 6601, 6590, 6596.55] },
  { x: new Date(1538872200000), y: [6598.91, 6605, 6596.61, 6600.02] },
  { x: new Date(1538874000000), y: [6600.55, 6605, 6589.14, 6593.01] },
  { x: new Date(1538875800000), y: [6593.15, 6605, 6592, 6603.06] },
  { x: new Date(1538877600000), y: [6603.07, 6604.5, 6599.09, 6603.89] },
  { x: new Date(1538879400000), y: [6604.44, 6604.44, 6600, 6603.5] },
  { x: new Date(1538881200000), y: [6603.5, 6603.99, 6597.5, 6603.86] },
  { x: new Date(1538883000000), y: [6603.85, 6605, 6600, 6604.07] },
  { x: new Date(1538884800000), y: [6604.98, 6606, 6604.07, 6606] },
]

// 7-period simple moving average of the closes; null until the window fills.
var maPeriod = 7
var maData = candleData.map(function (d, i) {
  if (i < maPeriod - 1) return { x: d.x, y: null }
  var sum = 0
  for (var k = i - maPeriod + 1; k <= i; k++) sum += candleData[k].y[3]
  return { x: d.x, y: Math.round((sum / maPeriod) * 100) / 100 }
})

export default {
  components: {
    apexchart: VueApexCharts,
  },
  data: function () {
    return {
      series: [
        {
          name: 'MA(7)',
          type: 'line',
          data: maData,
        },
        {
          name: 'candle',
          type: 'candlestick',
          data: candleData,
        },
      ],
      chartOptions: {
        chart: {
          height: 350,
          type: 'line',
        },
        title: {
          text: 'Price with 7-Period Moving Average',
          align: 'left',
        },
        stroke: {
          width: [2, 1],
        },
        tooltip: {
          shared: true,
          custom: [
            function ({ seriesIndex, dataPointIndex, w }) {
              return w.globals.series[seriesIndex][dataPointIndex]
            },
            function ({ seriesIndex, dataPointIndex, w }) {
              var o = w.globals.seriesCandleO[seriesIndex][dataPointIndex]
              var h = w.globals.seriesCandleH[seriesIndex][dataPointIndex]
              var l = w.globals.seriesCandleL[seriesIndex][dataPointIndex]
              var c = w.globals.seriesCandleC[seriesIndex][dataPointIndex]
              return (
                '<div class="apexcharts-tooltip-candlestick">' +
                '<div>Open: <span class="value">' +
                o +
                '</span></div>' +
                '<div>High: <span class="value">' +
                h +
                '</span></div>' +
                '<div>Low: <span class="value">' +
                l +
                '</span></div>' +
                '<div>Close: <span class="value">' +
                c +
                '</span></div>' +
                '</div>'
              )
            },
          ],
        },
        xaxis: {
          type: 'datetime',
        },
      },
    }
  },
}
</script>

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