1 files changed, 354 insertions, 0 deletions
diff --git a/ui/app/components/gas-customization/gas-price-chart/gas-price-chart.utils.js b/ui/app/components/gas-customization/gas-price-chart/gas-price-chart.utils.js
new file mode 100644
index 000000000..f19dafcc1
--- /dev/null
+++ b/ui/app/components/gas-customization/gas-price-chart/gas-price-chart.utils.js
@@ -0,0 +1,354 @@
+import * as d3 from 'd3'
+import c3 from 'c3'
+import BigNumber from 'bignumber.js'
+
+const newBigSigDig = n => (new BigNumber(n.toPrecision(15)))
+const createOp = (a, b, op) => (newBigSigDig(a))[op](newBigSigDig(b))
+const bigNumMinus = (a = 0, b = 0) => createOp(a, b, 'minus')
+const bigNumDiv = (a = 0, b = 1) => createOp(a, b, 'div')
+
+export function handleMouseMove ({ xMousePos, chartXStart, chartWidth, gasPrices, estimatedTimes, chart }) {
+  const { currentPosValue, newTimeEstimate } = getNewXandTimeEstimate({
+    xMousePos,
+    chartXStart,
+    chartWidth,
+    gasPrices,
+    estimatedTimes,
+  })
+
+  if (currentPosValue === null && newTimeEstimate === null) {
+    hideDataUI(chart, '#overlayed-circle')
+    return
+  }
+
+  const indexOfNewCircle = estimatedTimes.length + 1
+  const dataUIObj = generateDataUIObj(currentPosValue, indexOfNewCircle, newTimeEstimate)
+
+  chart.internal.overlayPoint(dataUIObj, indexOfNewCircle)
+  chart.internal.showTooltip([dataUIObj], d3.select('.c3-areas-data1')._groups[0])
+  chart.internal.showXGridFocus([dataUIObj])
+}
+
+export function getCoordinateData (selector) {
+  const node = d3.select(selector).node()
+  return node ? node.getBoundingClientRect() : {}
+}
+
+export function generateDataUIObj (x, index, value) {
+  return {
+    x,
+    value,
+    index,
+    id: 'data1',
+    name: 'data1',
+  }
+}
+
+export function handleChartUpdate ({ chart, gasPrices, newPrice, cssId }) {
+  const {
+    closestLowerValueIndex,
+    closestLowerValue,
+    closestHigherValueIndex,
+    closestHigherValue,
+  } = getAdjacentGasPrices({ gasPrices, priceToPosition: newPrice })
+
+  if (closestLowerValue && closestHigherValue) {
+    setSelectedCircle({
+      chart,
+      newPrice,
+      closestLowerValueIndex,
+      closestLowerValue,
+      closestHigherValueIndex,
+      closestHigherValue,
+    })
+  } else {
+    hideDataUI(chart, cssId)
+  }
+}
+
+export function getAdjacentGasPrices ({ gasPrices, priceToPosition }) {
+  const closestLowerValueIndex = gasPrices.findIndex((e, i, a) => e <= priceToPosition && a[i + 1] >= priceToPosition)
+  const closestHigherValueIndex = gasPrices.findIndex((e, i, a) => e > priceToPosition)
+  return {
+    closestLowerValueIndex,
+    closestHigherValueIndex,
+    closestHigherValue: gasPrices[closestHigherValueIndex],
+    closestLowerValue: gasPrices[closestLowerValueIndex],
+  }
+}
+
+export function extrapolateY ({ higherY = 0, lowerY = 0, higherX = 0, lowerX = 0, xForExtrapolation = 0 }) {
+  const slope = bigNumMinus(higherY, lowerY).div(bigNumMinus(higherX, lowerX))
+  const newTimeEstimate = slope.times(bigNumMinus(higherX, xForExtrapolation)).minus(newBigSigDig(higherY)).negated()
+
+  return newTimeEstimate.toNumber()
+}
+
+
+export function getNewXandTimeEstimate ({ xMousePos, chartXStart, chartWidth, gasPrices, estimatedTimes }) {
+  const chartMouseXPos = bigNumMinus(xMousePos, chartXStart)
+  const posPercentile = bigNumDiv(chartMouseXPos, chartWidth)
+
+  const currentPosValue = (bigNumMinus(gasPrices[gasPrices.length - 1], gasPrices[0]))
+    .times(newBigSigDig(posPercentile))
+    .plus(newBigSigDig(gasPrices[0]))
+    .toNumber()
+
+  const {
+    closestLowerValueIndex,
+    closestLowerValue,
+    closestHigherValueIndex,
+    closestHigherValue,
+  } = getAdjacentGasPrices({ gasPrices, priceToPosition: currentPosValue })
+
+  return !closestHigherValue || !closestLowerValue
+    ? {
+      currentPosValue: null,
+      newTimeEstimate: null,
+    }
+    : {
+      currentPosValue,
+      newTimeEstimate: extrapolateY({
+        higherY: estimatedTimes[closestHigherValueIndex],
+        lowerY: estimatedTimes[closestLowerValueIndex],
+        higherX: closestHigherValue,
+        lowerX: closestLowerValue,
+        xForExtrapolation: currentPosValue,
+      }),
+    }
+}
+
+export function hideDataUI (chart, dataNodeId) {
+  const overLayedCircle = d3.select(dataNodeId)
+  if (!overLayedCircle.empty()) {
+    overLayedCircle.remove()
+  }
+  d3.select('.c3-tooltip-container').style('display', 'none !important')
+  chart.internal.hideXGridFocus()
+}
+
+export function setTickPosition (axis, n, newPosition, secondNewPosition) {
+  const positionToShift = axis === 'y' ? 'x' : 'y'
+  const secondPositionToShift = axis === 'y' ? 'y' : 'x'
+  d3.select('#chart')
+    .select(`.c3-axis-${axis}`)
+    .selectAll('.tick')
+    .filter((d, i) => i === n)
+    .select('text')
+    .attr(positionToShift, 0)
+    .select('tspan')
+    .attr(positionToShift, newPosition)
+    .attr(secondPositionToShift, secondNewPosition || 0)
+    .style('visibility', 'visible')
+}
+
+export function appendOrUpdateCircle ({ data, itemIndex, cx, cy, cssId, appendOnly }) {
+  const circle = this.main
+    .select('.c3-selected-circles' + this.getTargetSelectorSuffix(data.id))
+    .selectAll(`.c3-selected-circle-${itemIndex}`)
+
+  if (appendOnly || circle.empty()) {
+    circle.data([data])
+      .enter().append('circle')
+      .attr('class', () => this.generateClass('c3-selected-circle', itemIndex))
+      .attr('id', cssId)
+      .attr('cx', cx)
+      .attr('cy', cy)
+      .attr('stroke', () => this.color(data))
+      .attr('r', 6)
+  } else {
+    circle.data([data])
+      .attr('cx', cx)
+      .attr('cy', cy)
+  }
+}
+
+export function setSelectedCircle ({
+  chart,
+  newPrice,
+  closestLowerValueIndex,
+  closestLowerValue,
+  closestHigherValueIndex,
+  closestHigherValue,
+}) {
+  const numberOfValues = chart.internal.data.xs.data1.length
+
+  const { x: lowerX, y: lowerY } = getCoordinateData(`.c3-circle-${closestLowerValueIndex}`)
+  let { x: higherX, y: higherY } = getCoordinateData(`.c3-circle-${closestHigherValueIndex}`)
+  let count = closestHigherValueIndex + 1
+
+  if (lowerX && higherX) {
+    while (lowerX === higherX) {
+      higherX = getCoordinateData(`.c3-circle-${count}`).x
+      higherY = getCoordinateData(`.c3-circle-${count}`).y
+      count++
+    }
+  }
+
+  const currentX = bigNumMinus(higherX, lowerX)
+    .times(bigNumMinus(newPrice, closestLowerValue))
+    .div(bigNumMinus(closestHigherValue, closestLowerValue))
+    .plus(newBigSigDig(lowerX))
+
+  const newTimeEstimate = extrapolateY({ higherY, lowerY, higherX, lowerX, xForExtrapolation: currentX })
+
+  chart.internal.selectPoint(
+    generateDataUIObj(currentX.toNumber(), numberOfValues, newTimeEstimate),
+    numberOfValues
+  )
+}
+
+
+export function generateChart (gasPrices, estimatedTimes, gasPricesMax, estimatedTimesMax) {
+  const gasPricesMaxPadded = gasPricesMax + 1
+  const chart = c3.generate({
+    size: {
+      height: 165,
+    },
+    transition: {
+      duration: 0,
+    },
+    padding: {left: 20, right: 15, top: 6, bottom: 10},
+    data: {
+        x: 'x',
+        columns: [
+            ['x', ...gasPrices],
+            ['data1', ...estimatedTimes],
+        ],
+        types: {
+          data1: 'area',
+        },
+        selection: {
+          enabled: false,
+        },
+    },
+    color: {
+      data1: '#259de5',
+    },
+    axis: {
+      x: {
+        min: gasPrices[0],
+        max: gasPricesMax,
+        tick: {
+          values: [Math.floor(gasPrices[0]), Math.ceil(gasPricesMax)],
+          outer: false,
+          format: function (val) { return val + ' GWEI' },
+        },
+        padding: {left: gasPricesMax / 50, right: gasPricesMax / 50},
+        label: {
+          text: 'Gas Price ($)',
+          position: 'outer-center',
+        },
+      },
+      y: {
+        padding: {top: 7, bottom: 7},
+        tick: {
+          values: [Math.floor(estimatedTimesMax * 0.05), Math.ceil(estimatedTimesMax * 0.97)],
+          outer: false,
+        },
+        label: {
+          text: 'Confirmation time (sec)',
+          position: 'outer-middle',
+        },
+        min: 0,
+      },
+    },
+    legend: {
+        show: false,
+    },
+    grid: {
+        x: {},
+        lines: {
+          front: false,
+        },
+    },
+    point: {
+      focus: {
+        expand: {
+          enabled: false,
+          r: 3.5,
+        },
+      },
+    },
+    tooltip: {
+      format: {
+        title: (v) => v.toPrecision(4),
+      },
+      contents: function (d) {
+        const titleFormat = this.config.tooltip_format_title
+        let text
+        d.forEach(el => {
+          if (el && (el.value || el.value === 0) && !text) {
+            text = "<table class='" + 'custom-tooltip' + "'>" + "<tr><th colspan='2'>" + titleFormat(el.x) + '</th></tr>'
+          }
+        })
+        return text + '</table>' + "<div class='tooltip-arrow'></div>"
+      },
+      position: function (data) {
+        if (d3.select('#overlayed-circle').empty()) {
+          return { top: -100, left: -100 }
+        }
+
+        const { x: circleX, y: circleY, width: circleWidth } = getCoordinateData('#overlayed-circle')
+        const { x: chartXStart, y: chartYStart } = getCoordinateData('.c3-chart')
+
+        // TODO: Confirm the below constants work with all data sets and screen sizes
+        const flipTooltip = circleY - circleWidth < chartYStart + 5
+
+        d3
+        .select('.tooltip-arrow')
+        .style('margin-top', flipTooltip ? '-16px' : '4px')
+
+        return {
+          top: bigNumMinus(circleY, chartYStart).minus(19).plus(flipTooltip ? circleWidth + 38 : 0).toNumber(),
+          left: bigNumMinus(circleX, chartXStart).plus(newBigSigDig(circleWidth)).minus(bigNumDiv(gasPricesMaxPadded, 50)).toNumber(),
+        }
+      },
+      show: true,
+    },
+  })
+
+  chart.internal.selectPoint = function (data, itemIndex = (data.index || 0)) {
+    const { x: chartXStart, y: chartYStart } = getCoordinateData('.c3-areas-data1')
+
+    d3.select('#set-circle').remove()
+
+    appendOrUpdateCircle.bind(this)({
+      data,
+      itemIndex,
+      cx: () => bigNumMinus(data.x, chartXStart).plus(11).toNumber(),
+      cy: () => bigNumMinus(data.value, chartYStart).plus(10).toNumber(),
+      cssId: 'set-circle',
+      appendOnly: true,
+    })
+  }
+
+  chart.internal.overlayPoint = function (data, itemIndex) {
+    appendOrUpdateCircle.bind(this)({
+      data,
+      itemIndex,
+      cx: this.circleX.bind(this),
+      cy: this.circleY.bind(this),
+      cssId: 'overlayed-circle',
+    })
+  }
+
+  chart.internal.showTooltip = function (selectedData, element) {
+    const dataToShow = selectedData.filter((d) => d && (d.value || d.value === 0))
+
+    if (dataToShow.length) {
+      this.tooltip.html(
+        this.config.tooltip_contents.call(this, selectedData, this.axis.getXAxisTickFormat(), this.getYFormat(), this.color)
+      ).style('display', 'flex')
+
+      // Get tooltip dimensions
+      const tWidth = this.tooltip.property('offsetWidth')
+      const tHeight = this.tooltip.property('offsetHeight')
+      const position = this.config.tooltip_position.call(this, dataToShow, tWidth, tHeight, element)
+      // Set tooltip
+      this.tooltip.style('top', position.top + 'px').style('left', position.left + 'px')
+    }
+  }
+
+  return chart
+}