export function ensureColumnsPopulated()

in packages/sanddance-explorer/src/columns.ts [28:85]
45 lines of code
15 McCabe index (conditional complexity)

export function ensureColumnsPopulated(chart: SandDance.specs.Chart, totalStyle: TotalStyle, insightColumns: SandDance.specs.InsightColumns, actualColumns: SandDance.types.Column[]) {
    //ensure columns are populated
    const nonInternal = actualColumns.filter(c => !SandDance.util.isInternalFieldName(c.name));
    const firstColumn = nonInternal[0];
    const firstColumnName = firstColumn && firstColumn.name;
    const firstQuantitative = nonInternal.filter(c => c.quantitative)[0];
    const firstQuantitativeColumnName = firstQuantitative && firstQuantitative.name;
    const ensureColumn = (role: SandDance.specs.InsightColumnRoles, quantitative?: boolean, treemap?: boolean) => {
        if (!insightColumns[role]) {
            if (treemap) {
                insightColumns[role] = getTreemapColumn(actualColumns).name;
            } else {
                insightColumns[role] = quantitative ? firstQuantitativeColumnName : firstColumnName;
            }
        }
    };
    function checkRequiresSize() {
        switch (totalStyle) {
            case 'sum-strip':
            case 'sum-strip-percent':
                ensureColumn('size', true);
                break;
            case 'sum-treemap':
                ensureColumn('size', true, true);
                break;
        }
    }
    switch (chart) {
        case 'barchart':
        case 'barchartV':
            ensureColumn('x');
            checkRequiresSize();
            break;
        case 'barchartH':
            ensureColumn('y');
            checkRequiresSize();
            break;
        case 'density':
            ensureColumn('x');
            ensureColumn('y');
            checkRequiresSize();
            break;
        case 'scatterplot':
        case 'stacks':
            ensureColumn('x');
            ensureColumn('y');
            break;
        case 'treemap':
            if (!insightColumns.size) {
                insightColumns.size = getTreemapColumn(actualColumns).name;
            }
            if (!insightColumns.size) {
                //error - no numeric column
                return [strings.errorColumnMustBeNumeric];
            }
            break;
    }
}