Phase 1A done

src/domain/services/legacy-consumer-migration-planner.ts

@@ -0,0 +1,57 @@
+export interface LegacyConsumerForPlanning {
+  id: string;
+  circuitNumber: string | null;
+  category: string | null;
+  phaseType: string | null;
+  phaseCount: number | null;
+}
+
+export function normalizeCircuitNumber(value: string | null): string | null {
+  if (!value) {
+    return null;
+  }
+  const trimmed = value.trim().toUpperCase();
+  if (!trimmed) {
+    return null;
+  }
+  if (!/^-\d+F\d+$/.test(trimmed)) {
+    return null;
+  }
+  return trimmed;
+}
+
+export function inferSectionKeyFromLegacyInput(consumer: LegacyConsumerForPlanning): string | null {
+  const category = (consumer.category ?? "").toLowerCase();
+  if (category.includes("light") || category.includes("beleuchtung")) {
+    return "lighting";
+  }
+  if (consumer.phaseCount === 3) {
+    return "three_phase";
+  }
+  if (consumer.phaseCount === 1) {
+    return "single_phase";
+  }
+
+  const phaseType = (consumer.phaseType ?? "").toLowerCase();
+  if (phaseType.includes("three") || phaseType.includes("3")) {
+    return "three_phase";
+  }
+  if (phaseType.includes("single") || phaseType.includes("1")) {
+    return "single_phase";
+  }
+  return null;
+}
+
+export function inferSectionKeyFromEquipmentIdentifier(equipmentIdentifier: string): string | null {
+  if (equipmentIdentifier.startsWith("-1F")) {
+    return "lighting";
+  }
+  if (equipmentIdentifier.startsWith("-2F")) {
+    return "single_phase";
+  }
+  if (equipmentIdentifier.startsWith("-3F")) {
+    return "three_phase";
+  }
+  return null;
+}
+