import type { LocalDelivery } from './db';

export function toDateKey(date: Date): string {
  const year = date.getFullYear();
  const month = String(date.getMonth() + 1).padStart(2, '0');
  const day = String(date.getDate()).padStart(2, '0');
  return `${year}-${month}-${day}`;
}

export function dateFromKey(key: string): Date {
  const [year, month, day] = key.split('-').map(Number);
  return new Date(year!, month! - 1, day!, 12);
}

export function deliveryDateKey(delivery: Pick<LocalDelivery, 'scheduledDate' | 'createdAt'>): string {
  return delivery.scheduledDate ?? delivery.createdAt.slice(0, 10);
}

export function addDays(date: Date, days: number): Date {
  const next = new Date(date);
  next.setDate(next.getDate() + days);
  return next;
}

export function weekStart(date: Date): Date {
  const start = new Date(date.getFullYear(), date.getMonth(), date.getDate(), 12);
  start.setDate(start.getDate() - start.getDay());
  return start;
}

export function weekDates(anchor: Date): Date[] {
  const start = weekStart(anchor);
  return Array.from({ length: 7 }, (_, index) => addDays(start, index));
}

export function activeDeliveries(deliveries: LocalDelivery[]): LocalDelivery[] {
  return deliveries.filter(delivery => !delivery.deletedAt && delivery.status !== 'cancelled');
}

export function deliveriesForDate(deliveries: LocalDelivery[], key: string): LocalDelivery[] {
  return deliveries.filter(delivery => !delivery.deletedAt && deliveryDateKey(delivery) === key);
}

export function valueOf(deliveries: LocalDelivery[]): number {
  return activeDeliveries(deliveries).reduce((sum, delivery) => sum + delivery.totalPriceAgorot, 0);
}