refactor(web): extract allocation drag action plans

apps/web/src/hooks/timelineAllocationActions.ts

@@ -0,0 +1,62 @@
+import {
+  buildAllocationMovedSnapshot,
+  requiresAllocationFragmentExtraction,
+  type AllocationMovedSnapshotLike,
+} from "./timelineAllocationFinalize.js";
+
+type AllocationActionLike = {
+  allocationId: string | null;
+  mutationAllocationId: string | null;
+  projectId: string | null;
+  projectName: string | null;
+  scope: "allocation" | "segment";
+  allocationStartDate: Date | null;
+  allocationEndDate: Date | null;
+  originalStartDate: Date | null;
+  originalEndDate: Date | null;
+  currentStartDate: Date | null;
+  currentEndDate: Date | null;
+};
+
+export function buildAllocationBlockClickInfo(
+  alloc: Pick<
+    AllocationActionLike,
+    "allocationId" | "projectId" | "projectName" | "originalStartDate" | "originalEndDate"
+  >,
+): { allocationId: string; projectId: string; projectName: string; startDate: Date; endDate: Date } | null {
+  if (!alloc.allocationId || !alloc.originalStartDate || !alloc.originalEndDate) {
+    return null;
+  }
+
+  return {
+    allocationId: alloc.allocationId,
+    projectId: alloc.projectId ?? "",
+    projectName: alloc.projectName ?? "",
+    startDate: alloc.originalStartDate,
+    endDate: alloc.originalEndDate,
+  };
+}
+
+export function buildAllocationMutationPlan(
+  alloc: AllocationActionLike,
+): {
+  activeAllocationId: string;
+  currentStartDate: Date;
+  currentEndDate: Date;
+  baseMutationAllocationId: string;
+  requiresExtraction: boolean;
+  pendingSnapshot: AllocationMovedSnapshotLike | null;
+} | null {
+  if (!alloc.allocationId || !alloc.currentStartDate || !alloc.currentEndDate) {
+    return null;
+  }
+
+  return {
+    activeAllocationId: alloc.allocationId,
+    currentStartDate: alloc.currentStartDate,
+    currentEndDate: alloc.currentEndDate,
+    baseMutationAllocationId: alloc.mutationAllocationId ?? alloc.allocationId,
+    requiresExtraction: requiresAllocationFragmentExtraction(alloc),
+    pendingSnapshot: buildAllocationMovedSnapshot(alloc),
+  };
+}