# All files / transforms line.ts

64% Statements 48/75
32.08% Branches 17/53
25% Functions 1/4
63.38% Lines 45/71

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     import {
      CumulativeValuesByTime,
      DomainLabel,
      LatestIndexMap,
      LineData,
      LineLayerSpec,
      LinePosition,
      NumericColumnData,
      Table,
    } from '../types'
    import {FILL, TIME, VALUE} from '../constants/columnKeys'
    import {createGroupIDColumn, getNominalColorScale} from './'
    import {getDomainDataFromLines} from '../utils/lineData'
    import {isDefined} from '../utils/isDefined'

    export const mapCumulativeValuesToTimeRange = (
      timesCol: NumericColumnData,
      valuesCol: NumericColumnData,
      fillCol: NumericColumnData
    ): CumulativeValuesByTime => {
      const cumulativeValues: CumulativeValuesByTime = {}

      if (timesCol) {
        timesCol.forEach((time, index) => {
          if (!cumulativeValues[time]) {
            cumulativeValues[time] = {}
          }
          const maxGroup = fillCol[index]

          if (!cumulativeValues[time][maxGroup]) {
            for (let i = 0; i <= maxGroup; i += 1) {
              if (!cumulativeValues[time][i]) {
                cumulativeValues[time][i] = 0
              }
            }
          }
          cumulativeValues[time][maxGroup] =
            maxGroup >= 1
              ? cumulativeValues[time][maxGroup - 1] + valuesCol[index]
              : valuesCol[index]
        })
      }
      return cumulativeValues
    }

    const getCumulativeValueAtTime = (
      cumulativeValues: CumulativeValuesByTime,
      time: number,
      groupID: number
    ): number => {
      if (
        !cumulativeValues ||
        !cumulativeValues[time] ||
        !cumulativeValues[time][groupID]
      ) {
        return 0
      }
      return cumulativeValues[time][groupID]
    }

    export const lineTransform = (
      inputTable: Table,
      xColumnKey: string,
      yColumnKey: string,
      fillColKeys: string[],
      colors: string[],
      position: LinePosition
    ): LineLayerSpec => {
      const [fillColumn, fillColumnMap] = createGroupIDColumn(
        inputTable,
        fillColKeys
      )

      const table = inputTable.addColumn(FILL, 'system', 'number', fillColumn)
      const xCol = table.getColumn(xColumnKey, 'number')
      const yCol = table.getColumn(yColumnKey, 'number')
      const fillScale = getNominalColorScale(fillColumnMap, colors)
      const lineData: LineData = {}
      let stackedValuesByTime: CumulativeValuesByTime = {}
      const latestIndices: LatestIndexMap = {}

      Iif (position === 'stacked') {
        if (yColumnKey === VALUE) {
          stackedValuesByTime = mapCumulativeValuesToTimeRange(
            xCol,
            yCol,
            fillColumn
          )
        } else if (xColumnKey === VALUE) {
          stackedValuesByTime = mapCumulativeValuesToTimeRange(
            yCol,
            xCol,
            fillColumn
          )
        }
      }

      let xMin = Infinity
      let xMax = -Infinity
      let yMin = Infinity
      let yMax = -Infinity

      for (let i = 0; i < table.length; i++) {
        const groupID = fillColumn[i]
        let x = xCol[i]
        let y = yCol[i]

        if (!lineData[groupID]) {
          lineData[groupID] = {xs: [], ys: [], fill: fillScale(groupID)}
        }

        Iif (position === 'stacked') {
          if (yColumnKey === VALUE) {
            y = getCumulativeValueAtTime(stackedValuesByTime, xCol[i], groupID)
          } else if (xColumnKey === VALUE) {
            x = getCumulativeValueAtTime(stackedValuesByTime, yCol[i], groupID)
          }
        }
        lineData[groupID].xs.push(x)
        lineData[groupID].ys.push(y)

        // remember the latest (most recent) index for each group
        if (!isDefined(latestIndices[groupID])) {
          latestIndices[groupID] = i
        } else Iif (yColumnKey === TIME) {
          if (
            y > yCol[latestIndices[groupID]] ||
            !isDefined(yCol[latestIndices[groupID]])
          ) {
            latestIndices[groupID] = i
          }
        } else Eif (
          x > xCol[latestIndices[groupID]] ||
          !isDefined(xCol[latestIndices[groupID]])
        ) {
          latestIndices[groupID] = i
        }

        if (x < xMin) {
          xMin = x
        }

        Eif (x > xMax) {
          xMax = x
        }

        if (y < yMin) {
          yMin = y
        }

        if (y > yMax) {
          yMax = y
        }
      }

      let stackedDomainValueColumn: NumericColumnData
      Iif (position === 'stacked') {
        stackedDomainValueColumn = getDomainDataFromLines(
          lineData,
          [...table.getColumn(FILL, 'number')],
          yColumnKey === VALUE ? DomainLabel.Y : DomainLabel.X
        )
      }

      return {
        type: 'line',
        inputTable,
        table,
        lineData,
        xDomain: [xMin, xMax],
        yDomain: [yMin, yMax],
        xColumnKey,
        yColumnKey,
        xColumnType: table.getColumnType(xColumnKey),
        yColumnType: table.getColumnType(yColumnKey),
        scales: {fill: fillScale},
        columnGroupMaps: {fill: fillColumnMap, latestIndices},
        stackedDomainValueColumn,
      }
    }