All first todos completed

src/domain/models/consumer.model.ts

@@ -3,6 +3,8 @@ export interface Consumer {
   projectId: string;
   distributionBoardId?: string;
   circuitListId?: string;
+  projectDeviceId?: string;
+  isLinkedToDevice?: boolean;
   roomId?: string;
   roomNumber?: string;
   roomName?: string;

src/domain/services/consumer-linking.service.ts

@@ -0,0 +1,36 @@
+import type { CreateConsumerInput } from "../../shared/validation/consumer.schemas.js";
+
+type ProjectDeviceForLinking = {
+  displayName: string;
+  category: string | null;
+  quantity: number;
+  installedPowerPerUnitKw: number;
+  demandFactor: number;
+  phaseCount: number | null;
+  powerFactor: number | null;
+  note: string | null;
+};
+
+export function applyLinkedProjectDeviceValues(
+  input: CreateConsumerInput,
+  projectDevice: ProjectDeviceForLinking | null
+): CreateConsumerInput {
+  if (!input.projectDeviceId || !input.isLinkedToDevice || !projectDevice) {
+    return input;
+  }
+
+  return {
+    ...input,
+    name: projectDevice.displayName,
+    category: projectDevice.category ?? undefined,
+    quantity: projectDevice.quantity,
+    installedPowerPerUnitKw: projectDevice.installedPowerPerUnitKw,
+    demandFactor: projectDevice.demandFactor,
+    phaseCount:
+      projectDevice.phaseCount === 1 || projectDevice.phaseCount === 3
+        ? (projectDevice.phaseCount as 1 | 3)
+        : undefined,
+    powerFactor: projectDevice.powerFactor ?? undefined,
+    note: projectDevice.note ?? undefined,
+  };
+}