Renumber circuit groups explicitly

tests/circuit-group-numbering.test.ts

@@ -16,8 +16,10 @@ import "./circuit-group-move-project-command.repository.test.js";
 import "./circuit-group-subtree-snapshot.test.js";
 import "./circuit-group-subtree-project-command.repository.test.js";
 import {
+  buildCircuitGroupRenumberPlan,
   buildCircuitGroupReorderAssignments,
   buildNewCircuitGroupSnapshot,
+  canRenumberCircuitGroups,
   canDeleteCircuitGroup,
   renameCircuitGroupSnapshot,
 } from "../src/frontend/utils/circuit-group-editing.js";
@@ -118,6 +120,105 @@ describe("circuit group numbering", () => {
     );
   });
 
+  it("renumbers a complete category by group order and preserves circuit suffixes", () => {
+    const sections = [
+      {
+        ...groupSection("lighting-3", "lighting", 3, 10),
+        prefix: "-1F3.",
+        circuits: [
+          {
+            id: "circuit-7",
+            circuitListId: "list-1",
+            sectionId: "lighting-3",
+            equipmentIdentifier: "-1F3.7",
+            sortOrder: 10,
+            isReserve: false,
+            circuitTotalPower: 0,
+            deviceRows: [],
+          },
+        ],
+        components: [
+          {
+            id: "rcd-3",
+            circuitListId: "list-1",
+            sectionId: "lighting-3",
+            equipmentIdentifier: "-1Q3.0",
+            name: "Gruppen-FI",
+            role: "group_residual_current_protection" as const,
+            placement: "group" as const,
+            sortOrder: 10,
+          },
+        ],
+      },
+      {
+        ...groupSection("lighting-1", "lighting", 1, 20),
+        prefix: "-1F1.",
+      },
+      groupSection("single-1", "single_phase", 1, 30),
+    ];
+
+    assert.deepEqual(buildCircuitGroupRenumberPlan(sections, "lighting"), {
+      groups: [
+        {
+          groupId: "lighting-3",
+          category: "lighting",
+          expectedGroupNumber: 3,
+          targetGroupNumber: 1,
+          expectedPrefix: "-1F3.",
+          targetPrefix: "-1F1.",
+          circuits: [
+            {
+              circuitId: "circuit-7",
+              expectedEquipmentIdentifier: "-1F3.7",
+              targetEquipmentIdentifier: "-1F1.7",
+            },
+          ],
+          components: [
+            {
+              componentId: "rcd-3",
+              expectedEquipmentIdentifier: "-1Q3.0",
+              targetEquipmentIdentifier: "-1Q1.0",
+            },
+          ],
+        },
+        {
+          groupId: "lighting-1",
+          category: "lighting",
+          expectedGroupNumber: 1,
+          targetGroupNumber: 2,
+          expectedPrefix: "-1F1.",
+          targetPrefix: "-1F2.",
+          circuits: [],
+          components: [],
+        },
+      ],
+    });
+    assert.equal(
+      buildCircuitGroupRenumberPlan(
+        [
+          groupSection("lighting-1", "lighting", 1, 10),
+          groupSection("lighting-2", "lighting", 2, 20),
+        ],
+        "lighting"
+      ),
+      null
+    );
+    assert.equal(
+      canRenumberCircuitGroups(sections, "lighting"),
+      true
+    );
+    assert.equal(
+      canRenumberCircuitGroups(
+        [
+          groupSection("lighting-1", "lighting", 1, 10),
+          groupSection("lighting-2", "lighting", 2, 20),
+        ],
+        "lighting"
+      ),
+      false
+    );
+  });
+
   it("formats the agreed identifiers including the leading hyphen", () => {
     assert.equal(
       formatGroupUpstreamProtectionIdentifier("lighting", 1),