openmonetis/components/calendario/utils.ts

import type { CalendarDay, CalendarEvent } from "@/components/calendario/types";

export const formatDateKey = (date: Date) => date.toISOString().slice(0, 10);

export const parseDateKey = (value: string) => {
  const [yearStr, monthStr, dayStr] = value.split("-");
  const year = Number.parseInt(yearStr ?? "", 10);
  const month = Number.parseInt(monthStr ?? "", 10);
  const day = Number.parseInt(dayStr ?? "", 10);

  return new Date(Date.UTC(year, (month ?? 1) - 1, day ?? 1));
};

const getWeekdayIndex = (date: Date) => {
  const day = date.getUTCDay(); // 0 (domingo) - 6 (sábado)
  // Ajusta para segunda-feira como primeiro dia
  return day === 0 ? 6 : day - 1;
};

export const buildCalendarDays = ({
  year,
  monthIndex,
  events,
}: {
  year: number;
  monthIndex: number;
  events: Map<string, CalendarEvent[]>;
}): CalendarDay[] => {
  const startOfMonth = new Date(Date.UTC(year, monthIndex, 1));
  const offset = getWeekdayIndex(startOfMonth);
  const startDate = new Date(Date.UTC(year, monthIndex, 1 - offset));
  const totalCells = 42; // 6 semanas
  const now = new Date();
  const todayKey = formatDateKey(
    new Date(Date.UTC(now.getFullYear(), now.getMonth(), now.getDate()))
  );

  const days: CalendarDay[] = [];

  for (let index = 0; index < totalCells; index += 1) {
    const currentDate = new Date(startDate);
    currentDate.setUTCDate(startDate.getUTCDate() + index);

    const dateKey = formatDateKey(currentDate);
    const isCurrentMonth = currentDate.getUTCMonth() === monthIndex;
    const dateLabel = currentDate.getUTCDate().toString();
    const eventsForDay = events.get(dateKey) ?? [];

    days.push({
      date: dateKey,
      label: dateLabel,
      isCurrentMonth,
      isToday: dateKey === todayKey,
      events: eventsForDay,
    });
  }

  return days;
};

export const WEEK_DAYS_SHORT = ["Seg", "Ter", "Qua", "Qui", "Sex", "Sáb", "Dom"];