import type { ThroughputEntry } from '$lib/types';

export type SortKey = 'date' | 'product' | 'packed' | 'total' | 'staff' | 'destination' | 'notes';
export type SortDirection = 'asc' | 'desc';

export type ConfettiPiece = {
  left: number;
  delay: number;
  duration: number;
  color: string;
  rotate: number;
  drift: number;
  size: number;
};

export const CONFETTI_COLORS = ['#16a34a', '#f59e0b', '#3b82f6', '#ec4899', '#8b5cf6', '#ef4444'];

export function compareText(a: string | null | undefined, b: string | null | undefined) {
  return (a ?? '').localeCompare(b ?? '', undefined, { sensitivity: 'base' });
}

export function compareDate(a: string | null | undefined, b: string | null | undefined) {
  const aTime = a ? Date.parse(a) : Number.NEGATIVE_INFINITY;
  const bTime = b ? Date.parse(b) : Number.NEGATIVE_INFINITY;
  return aTime - bTime;
}

export function toISODate(d: Date): string {
  return `${d.getFullYear()}-${String(d.getMonth() + 1).padStart(2, '0')}-${String(d.getDate()).padStart(2, '0')}`;
}

export function ausToday(): Date {
  const ymd = new Intl.DateTimeFormat('en-CA', {
    timeZone: 'Australia/Sydney',
    year: 'numeric',
    month: '2-digit',
    day: '2-digit'
  }).format(new Date());
  const [y, m, d] = ymd.split('-').map(Number);
  return new Date(y, m - 1, d);
}

export function startOfWeekMonday(d: Date): Date {
  const start = new Date(d.getFullYear(), d.getMonth(), d.getDate());
  const dow = (start.getDay() + 6) % 7;
  start.setDate(start.getDate() - dow);
  return start;
}

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

export function buildConfetti(colors = CONFETTI_COLORS): ConfettiPiece[] {
  return Array.from({ length: 42 }, (_, i) => ({
    left: Math.random() * 100,
    delay: Math.random() * 1.2,
    duration: 1 + Math.random() * 0.8,
    color: colors[i % colors.length],
    rotate: 220 + Math.random() * 360,
    drift: (Math.random() - 0.5) * 60,
    size: 6 + Math.random() * 6
  }));
}

export function isStockEntry(entry: ThroughputEntry): boolean {
  return entry.for_stock || (!entry.for_order && /stock/i.test(entry.notes ?? ''));
}