Persist circuit reorders

src/frontend/utils/circuit-section-reorder-command.ts

@@ -0,0 +1,44 @@
+import type {
+  CircuitSectionReorderAssignment,
+} from "../../domain/models/circuit-section-reorder-project-command.model.js";
+import type { CircuitTreeCircuitDto } from "../types.js";
+
+export function buildCircuitSectionReorderAssignments(
+  circuits: CircuitTreeCircuitDto[],
+  orderedCircuitIds: string[]
+): CircuitSectionReorderAssignment[] {
+  if (
+    circuits.length !== orderedCircuitIds.length ||
+    new Set(orderedCircuitIds).size !== orderedCircuitIds.length
+  ) {
+    throw new Error(
+      "Die Reihenfolge muss jeden Stromkreis des Bereichs genau einmal enthalten."
+    );
+  }
+
+  const circuitsById = new Map(
+    circuits.map((circuit) => [circuit.id, circuit])
+  );
+  const assignments = orderedCircuitIds.map((circuitId, index) => {
+    const circuit = circuitsById.get(circuitId);
+    if (!circuit) {
+      throw new Error(
+        "Die Reihenfolge enthält einen ungültigen Stromkreis."
+      );
+    }
+    return {
+      circuitId,
+      expectedSortOrder: circuit.sortOrder,
+      targetSortOrder: (index + 1) * 10,
+    };
+  });
+  if (
+    assignments.every(
+      (assignment) =>
+        assignment.expectedSortOrder === assignment.targetSortOrder
+    )
+  ) {
+    return [];
+  }
+  return assignments;
+}