refactor(api): extract timeline shift mutation helpers

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

@@ -0,0 +1,70 @@
+import type { SplitAssignmentRecord } from "@capakraken/application";
+import { Prisma, type PrismaClient } from "@capakraken/db";
+import type { ShiftValidationResult, WeekdayAvailability } from "@capakraken/shared";
+import { calculateTimelineAllocationDailyCost } from "./timeline-cost-support.js";
+import type { TimelineShiftProjectRecord } from "./timeline-shift-support.js";
+
+export function buildTimelineProjectDateRangeUpdate(input: {
+  newStartDate: Date;
+  newEndDate: Date;
+}) {
+  return {
+    startDate: input.newStartDate,
+    endDate: input.newEndDate,
+  };
+}
+
+export function buildTimelineShiftedAssignmentUpdate(input: {
+  newStartDate: Date;
+  newEndDate: Date;
+  dailyCostCents: number | undefined;
+}) {
+  return {
+    ...buildTimelineProjectDateRangeUpdate(input),
+    ...(input.dailyCostCents !== undefined ? { dailyCostCents: input.dailyCostCents } : {}),
+  };
+}
+
+export function buildTimelineProjectShiftAuditChanges(input: {
+  project: TimelineShiftProjectRecord;
+  newStartDate: Date;
+  newEndDate: Date;
+  validation: ShiftValidationResult;
+}): Prisma.InputJsonValue {
+  return {
+    before: {
+      startDate: input.project.startDate,
+      endDate: input.project.endDate,
+    },
+    after: {
+      startDate: input.newStartDate,
+      endDate: input.newEndDate,
+    },
+    costImpact: input.validation.costImpact,
+  } as unknown as Prisma.InputJsonValue;
+}
+
+export async function recalculateShiftedAssignmentDailyCost(input: {
+  db: PrismaClient;
+  assignment: SplitAssignmentRecord;
+  newStartDate: Date;
+  newEndDate: Date;
+}): Promise<number | undefined> {
+  if (!input.assignment.resourceId || !input.assignment.resource) {
+    return undefined;
+  }
+
+  const metadata = (input.assignment.metadata as Record<string, unknown> | null | undefined) ?? {};
+  const includeSaturday = (metadata.includeSaturday as boolean | undefined) ?? false;
+
+  return calculateTimelineAllocationDailyCost({
+    db: input.db,
+    resourceId: input.assignment.resourceId,
+    lcrCents: input.assignment.resource.lcrCents,
+    hoursPerDay: input.assignment.hoursPerDay,
+    startDate: input.newStartDate,
+    endDate: input.newEndDate,
+    availability: input.assignment.resource.availability as WeekdayAvailability,
+    includeSaturday,
+  });
+}