wip

packages/racing/domain/value-objects/RecurrenceStrategy.ts

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+import { WeekdaySet } from './WeekdaySet';
+import { MonthlyRecurrencePattern } from './MonthlyRecurrencePattern';
+import { RacingDomainValidationError } from '../errors/RacingDomainError';
+
+export type WeeklyRecurrenceStrategy = {
+  kind: 'weekly';
+  weekdays: WeekdaySet;
+};
+
+export type EveryNWeeksRecurrenceStrategy = {
+  kind: 'everyNWeeks';
+  weekdays: WeekdaySet;
+  intervalWeeks: number;
+};
+
+export type MonthlyNthWeekdayRecurrenceStrategy = {
+  kind: 'monthlyNthWeekday';
+  monthlyPattern: MonthlyRecurrencePattern;
+};
+
+export type RecurrenceStrategy =
+  | WeeklyRecurrenceStrategy
+  | EveryNWeeksRecurrenceStrategy
+  | MonthlyNthWeekdayRecurrenceStrategy;
+
+export class RecurrenceStrategyFactory {
+  static weekly(weekdays: WeekdaySet): RecurrenceStrategy {
+    if (weekdays.getAll().length === 0) {
+      throw new RacingDomainValidationError('weekdays are required for weekly recurrence');
+    }
+
+    return {
+      kind: 'weekly',
+      weekdays,
+    };
+  }
+
+  static everyNWeeks(intervalWeeks: number, weekdays: WeekdaySet): RecurrenceStrategy {
+    if (!Number.isInteger(intervalWeeks) || intervalWeeks <= 0) {
+      throw new RacingDomainValidationError('intervalWeeks must be a positive integer');
+    }
+    if (weekdays.getAll().length === 0) {
+      throw new RacingDomainValidationError('weekdays are required for everyNWeeks recurrence');
+    }
+
+    return {
+      kind: 'everyNWeeks',
+      weekdays,
+      intervalWeeks,
+    };
+  }
+
+  static monthlyNthWeekday(pattern: MonthlyRecurrencePattern): RecurrenceStrategy {
+    return {
+      kind: 'monthlyNthWeekday',
+      monthlyPattern: pattern,
+    };
+  }
+}