fix(dashboard): stabilize budget forecast derivation typing

packages/application/src/index.ts

@@ -83,6 +83,7 @@ export {
   type DashboardChargeabilityDerivation,
   type DashboardChargeabilityRow,
   getDashboardBudgetForecast,
+  type BudgetForecastDerivationSummary,
   type BudgetForecastRow,
   type BudgetForecastLocationSummary,
   type PeakTimesPeriodDerivation,

packages/application/src/use-cases/dashboard/get-budget-forecast.ts

@@ -15,6 +15,20 @@ export interface BudgetForecastLocationSummary {
   burnRateCents: number;
 }
 
+export interface BudgetForecastDerivationSummary {
+  periodStart: string;
+  periodEnd: string;
+  calendarContextCount: number;
+  holidayAwareAssignmentCount: number;
+  fallbackAssignmentCount: number;
+  baseBurnRateCents: number;
+  adjustedBurnRateCents: number;
+  publicHolidayDayEquivalent: number;
+  publicHolidayCostDeductionCents: number;
+  absenceDayEquivalent: number;
+  absenceCostDeductionCents: number;
+}
+
 export interface BudgetForecastRow {
   projectId?: string;
   projectName: string;
@@ -29,6 +43,29 @@ export interface BudgetForecastRow {
   pctUsed: number;
   activeAssignmentCount?: number;
   calendarLocations?: BudgetForecastLocationSummary[];
+  derivation?: BudgetForecastDerivationSummary;
+}
+
+const DAY_KEYS: (keyof WeekdayAvailability)[] = [
+  "sunday",
+  "monday",
+  "tuesday",
+  "wednesday",
+  "thursday",
+  "friday",
+  "saturday",
+];
+
+function toIsoDate(value: Date): string {
+  return value.toISOString().slice(0, 10);
+}
+
+function getDailyAvailabilityHours(
+  availability: WeekdayAvailability,
+  date: Date,
+): number {
+  const dayKey = DAY_KEYS[date.getUTCDay()];
+  return dayKey ? (availability[dayKey] ?? 0) : 0;
 }
 
 function hasAvailability<T extends { availability?: unknown }>(
@@ -54,6 +91,86 @@ function buildLocationKey(input: {
   });
 }
 
+function summarizeBurnDerivation(input: {
+  availability: WeekdayAvailability;
+  startDate: Date;
+  endDate: Date;
+  dailyCostCents: number;
+  periodStart: Date;
+  periodEnd: Date;
+  context: Awaited<ReturnType<typeof loadDailyAvailabilityContexts>> extends Map<string, infer TValue>
+    ? TValue | undefined
+    : never;
+}) {
+  const baseBurnRateCents = calculateEffectiveAllocationCostCents({
+    availability: input.availability,
+    startDate: input.startDate,
+    endDate: input.endDate,
+    dailyCostCents: input.dailyCostCents,
+    periodStart: input.periodStart,
+    periodEnd: input.periodEnd,
+    context: undefined,
+  });
+  const adjustedBurnRateCents = calculateEffectiveAllocationCostCents({
+    availability: input.availability,
+    startDate: input.startDate,
+    endDate: input.endDate,
+    dailyCostCents: input.dailyCostCents,
+    periodStart: input.periodStart,
+    periodEnd: input.periodEnd,
+    context: input.context,
+  });
+
+  const overlapStart = new Date(
+    Math.max(input.startDate.getTime(), input.periodStart.getTime()),
+  );
+  const overlapEnd = new Date(
+    Math.min(input.endDate.getTime(), input.periodEnd.getTime()),
+  );
+
+  let publicHolidayDayEquivalent = 0;
+  let publicHolidayCostDeductionCents = 0;
+  let absenceDayEquivalent = 0;
+  let absenceCostDeductionCents = 0;
+
+  if (overlapStart <= overlapEnd) {
+    const cursor = new Date(overlapStart);
+    cursor.setUTCHours(0, 0, 0, 0);
+    const end = new Date(overlapEnd);
+    end.setUTCHours(0, 0, 0, 0);
+
+    while (cursor <= end) {
+      const baseHours = getDailyAvailabilityHours(input.availability, cursor);
+      if (baseHours > 0) {
+        const isoDate = toIsoDate(cursor);
+        if (input.context?.holidayDates.has(isoDate)) {
+          publicHolidayDayEquivalent += 1;
+          publicHolidayCostDeductionCents += input.dailyCostCents;
+        } else {
+          const vacationFraction = Math.min(
+            1,
+            Math.max(0, input.context?.vacationFractionsByDate.get(isoDate) ?? 0),
+          );
+          if (vacationFraction > 0) {
+            absenceDayEquivalent += vacationFraction;
+            absenceCostDeductionCents += input.dailyCostCents * vacationFraction;
+          }
+        }
+      }
+      cursor.setUTCDate(cursor.getUTCDate() + 1);
+    }
+  }
+
+  return {
+    baseBurnRateCents,
+    adjustedBurnRateCents,
+    publicHolidayDayEquivalent,
+    publicHolidayCostDeductionCents: Math.round(publicHolidayCostDeductionCents),
+    absenceDayEquivalent,
+    absenceCostDeductionCents: Math.round(absenceCostDeductionCents),
+  };
+}
+
 export async function getDashboardBudgetForecast(
   db: PrismaClient,
 ): Promise<BudgetForecastRow[]> {
@@ -148,6 +265,7 @@ export async function getDashboardBudgetForecast(
   const monthlyBurnByProject = new Map<string, number>();
   const activeAssignmentCountByProject = new Map<string, number>();
   const activeLocationsByProject = new Map<string, Map<string, BudgetForecastLocationSummary>>();
+  const derivationByProject = new Map<string, Omit<BudgetForecastDerivationSummary, "periodStart" | "periodEnd" | "calendarContextCount">>();
 
   for (const assignment of assignments) {
     const totalCost = hasAvailability(assignment.resource)
@@ -169,8 +287,8 @@ export async function getDashboardBudgetForecast(
     );
 
     if (assignment.startDate <= now && assignment.endDate >= now) {
-      const monthlyContribution = hasAvailability(assignment.resource)
-        ? calculateEffectiveAllocationCostCents({
+      const derivation = hasAvailability(assignment.resource)
+        ? summarizeBurnDerivation({
           availability: assignment.resource.availability as unknown as WeekdayAvailability,
           startDate: assignment.startDate,
           endDate: assignment.endDate,
@@ -179,7 +297,9 @@ export async function getDashboardBudgetForecast(
           periodEnd: monthEnd,
           context: contexts.get(assignment.resource.id),
         })
-        : (assignment.dailyCostCents ?? 0) * 22;
+        : null;
+      const monthlyContribution = derivation?.adjustedBurnRateCents ?? (assignment.dailyCostCents ?? 0) * 22;
+      const baseMonthlyContribution = derivation?.baseBurnRateCents ?? monthlyContribution;
       monthlyBurnByProject.set(
         assignment.projectId,
         (monthlyBurnByProject.get(assignment.projectId) ?? 0) + monthlyContribution,
@@ -188,6 +308,28 @@ export async function getDashboardBudgetForecast(
         assignment.projectId,
         (activeAssignmentCountByProject.get(assignment.projectId) ?? 0) + 1,
       );
+      const existingDerivation = derivationByProject.get(assignment.projectId) ?? {
+        holidayAwareAssignmentCount: 0,
+        fallbackAssignmentCount: 0,
+        baseBurnRateCents: 0,
+        adjustedBurnRateCents: 0,
+        publicHolidayDayEquivalent: 0,
+        publicHolidayCostDeductionCents: 0,
+        absenceDayEquivalent: 0,
+        absenceCostDeductionCents: 0,
+      };
+      existingDerivation.baseBurnRateCents += baseMonthlyContribution;
+      existingDerivation.adjustedBurnRateCents += monthlyContribution;
+      if (derivation) {
+        existingDerivation.holidayAwareAssignmentCount += 1;
+        existingDerivation.publicHolidayDayEquivalent += derivation.publicHolidayDayEquivalent;
+        existingDerivation.publicHolidayCostDeductionCents += derivation.publicHolidayCostDeductionCents;
+        existingDerivation.absenceDayEquivalent += derivation.absenceDayEquivalent;
+        existingDerivation.absenceCostDeductionCents += derivation.absenceCostDeductionCents;
+      } else {
+        existingDerivation.fallbackAssignmentCount += 1;
+      }
+      derivationByProject.set(assignment.projectId, existingDerivation);
 
       const locationSummaries = activeLocationsByProject.get(assignment.projectId) ?? new Map();
       const locationKey = buildLocationKey({
@@ -228,6 +370,8 @@ export async function getDashboardBudgetForecast(
       estimatedExhaustionDate = exhaustionDate.toISOString().slice(0, 10);
     }
 
+    const derivation = derivationByProject.get(project.id);
+
     return {
       projectId: project.id,
       projectName: project.name,
@@ -243,6 +387,16 @@ export async function getDashboardBudgetForecast(
       activeAssignmentCount: activeAssignmentCountByProject.get(project.id) ?? 0,
       calendarLocations: Array.from(activeLocationsByProject.get(project.id)?.values() ?? [])
         .sort((left, right) => right.burnRateCents - left.burnRateCents),
+      ...(derivation
+        ? {
+          derivation: {
+            periodStart: toIsoDate(monthStart),
+            periodEnd: toIsoDate(monthEnd),
+            calendarContextCount: activeLocationsByProject.get(project.id)?.size ?? 0,
+            ...derivation,
+          },
+        }
+        : {}),
     };
   });
 

packages/application/src/use-cases/dashboard/index.ts

@@ -12,6 +12,7 @@ export {
 export {
   getDashboardTopValueResources,
   type GetDashboardTopValueResourcesInput,
+  type DashboardTopValueResourceRow,
 } from "./get-top-value-resources.js";
 
 export {
@@ -31,6 +32,7 @@ export {
 
 export {
   getDashboardBudgetForecast,
+  type BudgetForecastDerivationSummary,
   type BudgetForecastRow,
   type BudgetForecastLocationSummary,
 } from "./get-budget-forecast.js";