refactor(api): extract timeline project detail artifact loader

packages/api/src/router/timeline-project-context-support.ts

@@ -1,6 +1,10 @@
 import { TRPCError } from "@trpc/server";
 import type { Allocation } from "@capakraken/shared";
-import { summarizeHolidayOverlays, type formatHolidayOverlays } from "./timeline-holiday-read.js";
+import {
+  formatHolidayOverlays,
+  loadTimelineHolidayOverlays,
+  summarizeHolidayOverlays,
+} from "./timeline-holiday-read.js";
 import {
   anonymizeResourceOnEntry,
   createTimelineDateRange,
@@ -316,6 +320,70 @@ export function buildTimelineProjectContextDetailResponse<
   };
 }
 
+export async function loadTimelineProjectContextDetailArtifacts(
+  db: Parameters<typeof loadTimelineHolidayOverlays>[0],
+  input: {
+    projectId: string;
+    requestedStartDate?: string | undefined;
+    requestedEndDate?: string | undefined;
+    durationDays?: number | undefined;
+    projectStartDate?: Date | null | undefined;
+    projectEndDate?: Date | null | undefined;
+    firstAssignmentStartDate?: Date | string | null | undefined;
+    firstDemandStartDate?: Date | string | null | undefined;
+    assignments: Array<{
+      id: string;
+      resourceId: string | null;
+      resource?: { displayName?: string | null } | null;
+      startDate: Date | string;
+      endDate: Date | string;
+      hoursPerDay: number;
+    }>;
+    allResourceAllocations: Array<{
+      id: string;
+      resourceId: string | null;
+      projectId: string | null;
+      project?: { name?: string | null; shortCode?: string | null } | null;
+      startDate: Date | string;
+      endDate: Date | string;
+      hoursPerDay: number;
+      status: string;
+    }>;
+    resourceIds: string[];
+  },
+) {
+  const period = resolveTimelineProjectContextPeriod({
+    requestedStartDate: input.requestedStartDate,
+    requestedEndDate: input.requestedEndDate,
+    durationDays: input.durationDays,
+    projectStartDate: input.projectStartDate,
+    projectEndDate: input.projectEndDate,
+    firstAssignmentStartDate: input.firstAssignmentStartDate,
+    firstDemandStartDate: input.firstDemandStartDate,
+  });
+
+  const holidayOverlays = input.resourceIds.length > 0
+    ? formatHolidayOverlays(await loadTimelineHolidayOverlays(db, {
+        startDate: period.startDate,
+        endDate: period.endDate,
+        resourceIds: input.resourceIds,
+        projectIds: [input.projectId],
+      }))
+    : [];
+
+  const assignmentConflicts = buildTimelineProjectAssignmentConflicts({
+    projectId: input.projectId,
+    assignments: input.assignments,
+    allResourceAllocations: input.allResourceAllocations,
+  });
+
+  return {
+    period,
+    holidayOverlays,
+    assignmentConflicts,
+  };
+}
+
 export function buildTimelineShiftPreviewDetailResponse<TPreview>(input: {
   project: {
     id: string;