import { MS_PER_DAY } from "src/modules/shared/constants/date-time.constant";
import { DAY_KEYS, DayKey } from "./timesheet.types";

export function toUTCDateOnly(date: Date | string): Date {
  const d = new Date(date);
  return new Date(Date.UTC(d.getUTCFullYear(), d.getUTCMonth(), d.getUTCDate()));
}

export function addDays(date:Date, days: number): Date {
    return new Date(date.getTime() + days * MS_PER_DAY);
}

export function endOfDayUTC(date: Date | string): Date {
  const d = toUTCDateOnly(date);
  return new Date(d.getTime() + MS_PER_DAY - 1); 
}

export function isBetweenUTC(date: Date, start: Date, end_inclusive: Date): boolean {
    const time   = date.getTime();
    return time >= start.getTime() && time <= end_inclusive.getTime();
}

export function toTimeString(date: Date): string {
    const hours   = String(date.getUTCHours()).padStart(2,'0');
    const minutes = String(date.getUTCMinutes()).padStart(2,'0');
    return `${hours}:${minutes}`;
}

export function round2(num: number) { 
    return Math.round(num * 100) / 100; 
}

export function shortDate(date:Date): string {
    const mm = String(date.getUTCMonth()+1).padStart(2,'0');
    const dd = String(date.getUTCDate()).padStart(2,'0');
    return `${mm}/${dd}`;
}

export function dayKeyFromDate(date: Date, useUTC = true): DayKey {
  const index = useUTC ? date.getUTCDay() : date.getDay(); // 0=Sunday..6=Saturday
  return DAY_KEYS[index];
}

export const toHHmm = (date: Date) => date.toISOString().slice(11, 16);

export function parseISODate(iso: string): Date {
    const [ y, m, d ] = iso.split('-').map(Number);
    return new Date(y, (m ?? 1) - 1, d ?? 1);
}

export function parseHHmm(t: string): Date {
    const [ hh, mm ] = t.split(':').map(Number);
    return new Date(1970, 0, 1, hh || 0, mm || 0, 0, 0);
}

export const toNum = (value: any) =>
        value && typeof value.toNumber === 'function' ? value.toNumber() :
        typeof value === 'number' ? value :
        value ? Number(value) : 0;


export const upper = (s?: string | null) => String(s ?? '').toUpperCase();

export const toRangeFromPeriod = (period: { period_start: Date; period_end: Date }) => ({
  from: toUTCDateOnly(period.period_start),
  to: endOfDayUTC(period.period_end),
});