refactor(api): extract timeline cost support

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

@@ -5,10 +5,10 @@ import {
   type SplitDemandRequirementRecord,
 } from "@capakraken/application";
 import { Prisma, type PrismaClient } from "@capakraken/db";
-import { calculateAllocation, validateShift } from "@capakraken/engine";
-import type { ShiftValidationResult, WeekdayAvailability } from "@capakraken/shared";
+import { validateShift } from "@capakraken/engine";
+import type { ShiftValidationResult } from "@capakraken/shared";
 import { TRPCError } from "@trpc/server";
-import { buildAbsenceDays, loadCalculationRules } from "./timeline-allocation-mutations.js";
+import { calculateTimelineAllocationDailyCost } from "./timeline-cost-support.js";
 import type { TimelineShiftPlan } from "./timeline-shift-planning.js";
 
 export interface TimelineShiftProjectRecord {
@@ -123,27 +123,16 @@ async function recalculateShiftedAssignmentDailyCost(input: {
 
   const metadata = (input.assignment.metadata as Record<string, unknown> | null | undefined) ?? {};
   const includeSaturday = (metadata.includeSaturday as boolean | undefined) ?? false;
-  const [shiftAbsenceData, shiftRules] = await Promise.all([
-    buildAbsenceDays(
-      input.db,
-      input.assignment.resourceId,
-      input.newStartDate,
-      input.newEndDate,
-    ),
-    loadCalculationRules(input.db),
-  ]);
-
-  return calculateAllocation({
+  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,
+    availability: input.assignment.resource.availability as import("@capakraken/shared").WeekdayAvailability,
     includeSaturday,
-    vacationDates: shiftAbsenceData.legacyVacationDates,
-    absenceDays: shiftAbsenceData.absenceDays,
-    calculationRules: shiftRules,
-  }).dailyCostCents;
+  });
 }
 
 export async function applyTimelineProjectShift(input: ApplyTimelineProjectShiftInput) {