refactor(api): extract timeline allocation batch shift support

packages/api/src/__tests__/timeline-allocation-shift-support.test.ts

@@ -0,0 +1,146 @@
+import { TRPCError } from "@trpc/server";
+import { describe, expect, it, vi } from "vitest";
+
+const {
+  findAllocationEntryMock,
+  updateAllocationEntryMock,
+} = vi.hoisted(() => ({
+  findAllocationEntryMock: vi.fn(),
+  updateAllocationEntryMock: vi.fn(),
+}));
+
+vi.mock("@capakraken/application", async (importOriginal) => {
+  const actual = await importOriginal<typeof import("@capakraken/application")>();
+  return {
+    ...actual,
+    findAllocationEntry: findAllocationEntryMock,
+    updateAllocationEntry: updateAllocationEntryMock,
+  };
+});
+
+import { applyTimelineBatchAllocationShift } from "../router/timeline-allocation-shift-support.js";
+
+describe("timeline allocation shift support", () => {
+  it("returns an empty result when the shift delta is zero", async () => {
+    const db = {
+      $transaction: vi.fn(),
+    };
+
+    await expect(applyTimelineBatchAllocationShift({
+      db: db as never,
+      allocationIds: ["allocation_1"],
+      daysDelta: 0,
+      mode: "move",
+    })).resolves.toEqual([]);
+
+    expect(findAllocationEntryMock).not.toHaveBeenCalled();
+    expect(db.$transaction).not.toHaveBeenCalled();
+  });
+
+  it("throws when no allocations can be resolved", async () => {
+    findAllocationEntryMock.mockResolvedValue(null);
+
+    await expect(applyTimelineBatchAllocationShift({
+      db: {
+        $transaction: vi.fn(),
+      } as never,
+      allocationIds: ["missing_1", "missing_2"],
+      daysDelta: 2,
+      mode: "move",
+    })).rejects.toThrowError(new TRPCError({
+      code: "NOT_FOUND",
+      message: "No allocations found",
+    }));
+  });
+
+  it("updates resolved allocations and writes a batch audit record", async () => {
+    findAllocationEntryMock
+      .mockResolvedValueOnce({
+        entry: {
+          id: "allocation_1",
+          startDate: new Date("2026-04-01T00:00:00.000Z"),
+          endDate: new Date("2026-04-05T00:00:00.000Z"),
+        },
+      })
+      .mockResolvedValueOnce(null)
+      .mockResolvedValueOnce({
+        entry: {
+          id: "allocation_3",
+          startDate: new Date("2026-04-10T00:00:00.000Z"),
+          endDate: new Date("2026-04-12T00:00:00.000Z"),
+        },
+      });
+
+    updateAllocationEntryMock
+      .mockResolvedValueOnce({
+        allocation: { id: "allocation_1", projectId: "project_1", resourceId: "resource_1" },
+      })
+      .mockResolvedValueOnce({
+        allocation: { id: "allocation_3", projectId: "project_2", resourceId: "resource_2" },
+      });
+
+    const tx = {
+      auditLog: {
+        create: vi.fn().mockResolvedValue({}),
+      },
+    };
+    const db = {
+      $transaction: vi.fn(async (callback: (client: typeof tx) => unknown) => callback(tx)),
+    };
+
+    const result = await applyTimelineBatchAllocationShift({
+      db: db as never,
+      allocationIds: ["allocation_1", "missing_2", "allocation_3"],
+      daysDelta: 2,
+      mode: "move",
+    });
+
+    expect(result).toEqual([
+      { id: "allocation_1", projectId: "project_1", resourceId: "resource_1" },
+      { id: "allocation_3", projectId: "project_2", resourceId: "resource_2" },
+    ]);
+    expect(updateAllocationEntryMock).toHaveBeenNthCalledWith(
+      1,
+      tx,
+      {
+        id: "allocation_1",
+        demandRequirementUpdate: {
+          startDate: new Date("2026-04-03T00:00:00.000Z"),
+          endDate: new Date("2026-04-07T00:00:00.000Z"),
+        },
+        assignmentUpdate: {
+          startDate: new Date("2026-04-03T00:00:00.000Z"),
+          endDate: new Date("2026-04-07T00:00:00.000Z"),
+        },
+      },
+    );
+    expect(updateAllocationEntryMock).toHaveBeenNthCalledWith(
+      2,
+      tx,
+      {
+        id: "allocation_3",
+        demandRequirementUpdate: {
+          startDate: new Date("2026-04-12T00:00:00.000Z"),
+          endDate: new Date("2026-04-14T00:00:00.000Z"),
+        },
+        assignmentUpdate: {
+          startDate: new Date("2026-04-12T00:00:00.000Z"),
+          endDate: new Date("2026-04-14T00:00:00.000Z"),
+        },
+      },
+    );
+    expect(tx.auditLog.create).toHaveBeenCalledWith({
+      data: {
+        entityType: "Allocation",
+        entityId: "allocation_1,missing_2,allocation_3",
+        action: "UPDATE",
+        changes: {
+          operation: "batchShift",
+          mode: "move",
+          daysDelta: 2,
+          count: 2,
+        },
+      },
+    });
+  });
+});

packages/api/src/router/timeline-allocation-mutations.ts

@@ -1,7 +1,6 @@
 import {
   buildSplitAllocationReadModel,
   createAssignment,
-  findAllocationEntry,
   loadAllocationEntry,
   updateAllocationEntry,
 } from "@capakraken/application";
@@ -25,11 +24,10 @@ import {
   buildTimelineAllocationEntryUpdate,
   buildTimelineAllocationMetadata,
   buildTimelineAllocationUpdateAuditChanges,
-  buildTimelineBatchShiftAuditChanges,
   buildTimelineQuickAssignAssignmentInput,
-  shiftTimelineAllocationWindow,
   validateTimelineAllocationDateRanges,
 } from "./timeline-allocation-mutation-support.js";
+import { applyTimelineBatchAllocationShift } from "./timeline-allocation-shift-support.js";
 import { calculateTimelineAllocationDailyCost } from "./timeline-cost-support.js";
 
 export const timelineAllocationMutationProcedures = {
@@ -227,63 +225,11 @@ export const timelineAllocationMutationProcedures = {
     .mutation(async ({ ctx, input }) => {
       requirePermission(ctx, PermissionKey.MANAGE_ALLOCATIONS);
 
-      if (input.daysDelta === 0) {
-        return { count: 0 };
-      }
-
-      const entries = await Promise.all(
-        input.allocationIds.map((allocationId) => findAllocationEntry(ctx.db, allocationId)),
-      );
-      const resolved = entries.filter(
-        (entry): entry is NonNullable<typeof entry> => entry !== null,
-      );
-
-      if (resolved.length === 0) {
-        throw new TRPCError({ code: "NOT_FOUND", message: "No allocations found" });
-      }
-
-      const results = await ctx.db.$transaction(async (tx) => {
-        const updated = [];
-        for (const entry of resolved) {
-          const existing = entry.entry;
-          const shiftedWindow = shiftTimelineAllocationWindow({
-            startDate: existing.startDate,
-            endDate: existing.endDate,
-            daysDelta: input.daysDelta,
-            mode: input.mode,
-          });
-
-          const result = await updateAllocationEntry(
-            tx as unknown as Parameters<typeof updateAllocationEntry>[0],
-            {
-              id: existing.id,
-              demandRequirementUpdate: {
-                startDate: shiftedWindow.startDate,
-                endDate: shiftedWindow.endDate,
-              },
-              assignmentUpdate: {
-                startDate: shiftedWindow.startDate,
-                endDate: shiftedWindow.endDate,
-              },
-            },
-          );
-          updated.push(result.allocation);
-        }
-
-        await tx.auditLog.create({
-          data: {
-            entityType: "Allocation",
-            entityId: input.allocationIds.join(","),
-            action: "UPDATE",
-            changes: buildTimelineBatchShiftAuditChanges({
-              mode: input.mode,
-              daysDelta: input.daysDelta,
-              count: resolved.length,
-            }),
-          },
-        });
-
-        return updated;
+      const results = await applyTimelineBatchAllocationShift({
+        db: ctx.db as PrismaClient,
+        allocationIds: input.allocationIds,
+        daysDelta: input.daysDelta,
+        mode: input.mode,
       });
 
       for (const allocation of results) {

packages/api/src/router/timeline-allocation-shift-support.ts

@@ -0,0 +1,74 @@
+import { findAllocationEntry, updateAllocationEntry } from "@capakraken/application";
+import type { PrismaClient } from "@capakraken/db";
+import { TRPCError } from "@trpc/server";
+import {
+  buildTimelineBatchShiftAuditChanges,
+  shiftTimelineAllocationWindow,
+  type TimelineBatchShiftMode,
+} from "./timeline-allocation-mutation-support.js";
+
+export async function applyTimelineBatchAllocationShift(input: {
+  db: PrismaClient;
+  allocationIds: string[];
+  daysDelta: number;
+  mode: TimelineBatchShiftMode;
+}) {
+  if (input.daysDelta === 0) {
+    return [];
+  }
+
+  const entries = await Promise.all(
+    input.allocationIds.map((allocationId) => findAllocationEntry(input.db, allocationId)),
+  );
+  const resolved = entries.filter(
+    (entry): entry is NonNullable<typeof entry> => entry !== null,
+  );
+
+  if (resolved.length === 0) {
+    throw new TRPCError({ code: "NOT_FOUND", message: "No allocations found" });
+  }
+
+  return input.db.$transaction(async (tx) => {
+    const updated = [];
+    for (const entry of resolved) {
+      const existing = entry.entry;
+      const shiftedWindow = shiftTimelineAllocationWindow({
+        startDate: existing.startDate,
+        endDate: existing.endDate,
+        daysDelta: input.daysDelta,
+        mode: input.mode,
+      });
+
+      const result = await updateAllocationEntry(
+        tx as unknown as Parameters<typeof updateAllocationEntry>[0],
+        {
+          id: existing.id,
+          demandRequirementUpdate: {
+            startDate: shiftedWindow.startDate,
+            endDate: shiftedWindow.endDate,
+          },
+          assignmentUpdate: {
+            startDate: shiftedWindow.startDate,
+            endDate: shiftedWindow.endDate,
+          },
+        },
+      );
+      updated.push(result.allocation);
+    }
+
+    await tx.auditLog.create({
+      data: {
+        entityType: "Allocation",
+        entityId: input.allocationIds.join(","),
+        action: "UPDATE",
+        changes: buildTimelineBatchShiftAuditChanges({
+          mode: input.mode,
+          daysDelta: input.daysDelta,
+          count: resolved.length,
+        }),
+      },
+    });
+
+    return updated;
+  });
+}