wip

packages/racing/domain/services/SeasonScheduleGenerator.ts

@@ -0,0 +1,175 @@
+import { SeasonSchedule } from '../value-objects/SeasonSchedule';
+import { ScheduledRaceSlot } from '../value-objects/ScheduledRaceSlot';
+import type { RecurrenceStrategy } from '../value-objects/RecurrenceStrategy';
+import { RaceTimeOfDay } from '../value-objects/RaceTimeOfDay';
+import type { Weekday } from '../value-objects/Weekday';
+import { weekdayToIndex } from '../value-objects/Weekday';
+
+function cloneDate(date: Date): Date {
+  return new Date(date.getTime());
+}
+
+function addDays(date: Date, days: number): Date {
+  const d = cloneDate(date);
+  d.setDate(d.getDate() + days);
+  return d;
+}
+
+function addWeeks(date: Date, weeks: number): Date {
+  return addDays(date, weeks * 7);
+}
+
+function addMonths(date: Date, months: number): Date {
+  const d = cloneDate(date);
+  const targetMonth = d.getMonth() + months;
+  d.setMonth(targetMonth);
+  return d;
+}
+
+function applyTimeOfDay(baseDate: Date, timeOfDay: RaceTimeOfDay): Date {
+  const d = new Date(
+    baseDate.getFullYear(),
+    baseDate.getMonth(),
+    baseDate.getDate(),
+    timeOfDay.hour,
+    timeOfDay.minute,
+    0,
+    0,
+  );
+  return d;
+}
+
+// Treat Monday as 1 ... Sunday as 7
+function getCalendarWeekdayIndex(date: Date): number {
+  const jsDay = date.getDay(); // 0=Sun ... 6=Sat
+  if (jsDay === 0) {
+    return 7;
+  }
+  return jsDay;
+}
+
+function weekdayToCalendarOffset(anchor: Date, target: Weekday): number {
+  const anchorIndex = getCalendarWeekdayIndex(anchor);
+  const targetIndex = weekdayToIndex(target);
+  return targetIndex - anchorIndex;
+}
+
+function generateWeeklyOrEveryNWeeksSlots(
+  schedule: SeasonSchedule,
+  maxRounds: number,
+): ScheduledRaceSlot[] {
+  const result: ScheduledRaceSlot[] = [];
+  const recurrence = schedule.recurrence;
+  const weekdays =
+    recurrence.kind === 'weekly' || recurrence.kind === 'everyNWeeks'
+      ? recurrence.weekdays.getAll()
+      : [];
+
+  if (weekdays.length === 0) {
+    throw new Error('RecurrenceStrategy has no weekdays');
+  }
+
+  const intervalWeeks = recurrence.kind === 'everyNWeeks' ? recurrence.intervalWeeks : 1;
+
+  let anchorWeekStart = cloneDate(schedule.startDate);
+  let roundNumber = 1;
+
+  while (result.length < maxRounds) {
+    for (const weekday of weekdays) {
+      const offset = weekdayToCalendarOffset(anchorWeekStart, weekday);
+      const candidateDate = addDays(anchorWeekStart, offset);
+
+      if (candidateDate < schedule.startDate) {
+        continue;
+      }
+
+      const scheduledAt = applyTimeOfDay(candidateDate, schedule.timeOfDay);
+      result.push(
+        new ScheduledRaceSlot({
+          roundNumber,
+          scheduledAt,
+          timezone: schedule.timezone,
+        }),
+      );
+      roundNumber += 1;
+
+      if (result.length >= maxRounds) {
+        break;
+      }
+    }
+
+    anchorWeekStart = addWeeks(anchorWeekStart, intervalWeeks);
+  }
+
+  return result;
+}
+
+function findNthWeekdayOfMonth(base: Date, ordinal: 1 | 2 | 3 | 4, weekday: Weekday): Date {
+  const firstOfMonth = new Date(base.getFullYear(), base.getMonth(), 1);
+  const firstIndex = getCalendarWeekdayIndex(firstOfMonth);
+  const targetIndex = weekdayToIndex(weekday);
+
+  let offset = targetIndex - firstIndex;
+  if (offset < 0) {
+    offset += 7;
+  }
+
+  const dayOfMonth = 1 + offset + (ordinal - 1) * 7;
+  return new Date(base.getFullYear(), base.getMonth(), dayOfMonth);
+}
+
+function generateMonthlySlots(schedule: SeasonSchedule, maxRounds: number): ScheduledRaceSlot[] {
+  const result: ScheduledRaceSlot[] = [];
+  const recurrence = schedule.recurrence;
+  if (recurrence.kind !== 'monthlyNthWeekday') {
+    return result;
+  }
+
+  const { ordinal, weekday } = recurrence.monthlyPattern;
+  let currentMonthDate = new Date(
+    schedule.startDate.getFullYear(),
+    schedule.startDate.getMonth(),
+    1,
+  );
+  let roundNumber = 1;
+
+  while (result.length < maxRounds) {
+    const candidateDate = findNthWeekdayOfMonth(currentMonthDate, ordinal, weekday);
+
+    if (candidateDate >= schedule.startDate) {
+      const scheduledAt = applyTimeOfDay(candidateDate, schedule.timeOfDay);
+      result.push(
+        new ScheduledRaceSlot({
+          roundNumber,
+          scheduledAt,
+          timezone: schedule.timezone,
+        }),
+      );
+      roundNumber += 1;
+    }
+
+    currentMonthDate = addMonths(currentMonthDate, 1);
+  }
+
+  return result;
+}
+
+export class SeasonScheduleGenerator {
+  static generateSlots(schedule: SeasonSchedule): ScheduledRaceSlot[] {
+    return this.generateSlotsUpTo(schedule, schedule.plannedRounds);
+  }
+
+  static generateSlotsUpTo(schedule: SeasonSchedule, maxRounds: number): ScheduledRaceSlot[] {
+    if (!Number.isInteger(maxRounds) || maxRounds <= 0) {
+      throw new Error('maxRounds must be a positive integer');
+    }
+
+    const recurrence: RecurrenceStrategy = schedule.recurrence;
+
+    if (recurrence.kind === 'monthlyNthWeekday') {
+      return generateMonthlySlots(schedule, maxRounds);
+    }
+
+    return generateWeeklyOrEveryNWeeksSlots(schedule, maxRounds);
+  }
+}