feat(materials per day): more work on materials per day

lstV2/server/services/notifications/controller/materialsPerDay/materialWithInv.ts

@@ -0,0 +1,64 @@
+export const buildInventoryTimeline = (
+	weeklyDemand: Array<{
+		MaterialHumanReadableId: string;
+		WeekStart: string;
+		WeeklyDemand: number;
+	}>,
+	opening: Record<string, number>,
+) => {
+	// group weekly demand by material
+	const grouped: Record<
+		string,
+		Array<{ WeekStart: string; Demand: number }>
+	> = {};
+
+	for (const d of weeklyDemand) {
+		const mat = d.MaterialHumanReadableId;
+		grouped[mat] ??= [];
+		grouped[mat].push({
+			WeekStart: d.WeekStart,
+			Demand: Number(d.WeeklyDemand),
+		});
+	}
+
+	// sort weeks chronologically per material
+	for (const mat of Object.keys(grouped)) {
+		grouped[mat].sort(
+			(a, b) =>
+				new Date(a.WeekStart).getTime() - new Date(b.WeekStart).getTime(),
+		);
+	}
+
+	const result: Array<{
+		MaterialHumanReadableId: string;
+		WeekStart: string;
+		OpeningInventory: number;
+		Consumption: number;
+		ClosingInventory: number;
+	}> = [];
+
+	for (const [mat, weeks] of Object.entries(grouped)) {
+		// get starting inventory from the ERP result
+		let inv = opening[mat] ?? 0;
+
+		for (const w of weeks) {
+			const week = w.WeekStart;
+			const demand = Number(w.Demand);
+
+			const openingInv = inv;
+			const closingInv = openingInv - demand;
+
+			result.push({
+				MaterialHumanReadableId: mat,
+				WeekStart: week,
+				OpeningInventory: Number(openingInv.toFixed(2)),
+				Consumption: Number(demand.toFixed(2)),
+				ClosingInventory: Number(closingInv.toFixed(2)),
+			});
+
+			inv = closingInv;
+		}
+	}
+
+	return result;
+};