Readded InvestmentByGroup

apps/api/src/app/portfolio/portfolio-calculator.ts

@@ -803,6 +803,29 @@ export class PortfolioCalculator {
     });
   }
 
+  public getInvestmentsByGroup({
+    data,
+    groupBy
+  }: {
+    data: HistoricalDataItem[];
+    groupBy: GroupBy;
+  }): InvestmentItem[] {
+    const groupedData: { [dateGroup: string]: Big } = {};
+
+    for (const { date, investmentValueWithCurrencyEffect } of data) {
+      const dateGroup =
+        groupBy === 'month' ? date.substring(0, 7) : date.substring(0, 4);
+      groupedData[dateGroup] = (groupedData[dateGroup] ?? new Big(0)).plus(
+        investmentValueWithCurrencyEffect
+      );
+    }
+
+    return Object.keys(groupedData).map((dateGroup) => ({
+      date: groupBy === 'month' ? `${dateGroup}-01` : `${dateGroup}-01-01`,
+      investment: groupedData[dateGroup].toNumber()
+    }));
+  }
+
   private calculateOverallPerformance(positions: TimelinePosition[]) {
     let currentValue = new Big(0);
     let grossPerformance = new Big(0);