All files / src/components/Calendar/DayCalendar index.tsx

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'use client';
 
import { useCallback, useEffect, useState } from 'react';
import { addDays } from 'date-fns';
 
import { MAX_YEAR, MIN_YEAR, MONTHS } from '@/constants/calendar';
import { dayCalendarClassNames } from '@/constants/calendarClassNames';
import { ENV } from '@/constants/env';
 
import { DAYS, Months } from '@shared/types';
import { BaseVariant } from '@/types';
 
import { combineClasses } from '@shared/utils';
 
import {
  getDisabledMatchers,
  parseDateFromYYYYMMDD,
  getMondayToFridayRange,
  getYears,
} from '@/utils/calendar';
 
import { Calendar as CalendarShadcn } from '@/components/Calendar/Shadcn/calendar';
import {
  Select,
  SelectContent,
  SelectItem,
  SelectTrigger,
  SelectValue,
} from '@/components/Calendar/Shadcn/select';
 
import '../styles/style.css';
import '../styles/day-calendar.css';
 
type DateRange = { from: Date; to: Date };
 
const variantTheme = {
  [BaseVariant.PRIMARY]: {
    root: 'day-calendar',
    selectors: 'day-calendar-selectors',
    selectTrigger: 'day-calendar-select-trigger',
    selectContent: 'day-calendar-select-content',
    selectItem: 'day-calendar-select-item',
    calendarContainer: 'calendar-container',
    calendar: 'day-calendar-picker',
    weekday: 'day-calendar-weekday',
    weekdayWeekend: 'day-calendar-weekday-weekend',
  },
};
 
export interface DayCalendarProps {
  selectedRanges?: DateRange[];
  onChange?: (ranges: DateRange[]) => void;
  onDone?: () => void;
  className?: string;
  variant?: BaseVariant;
}
 
export const DayCalendar = ({
  selectedRanges = [],
  onChange,
  onDone,
  className,
  variant = BaseVariant.PRIMARY,
}: DayCalendarProps) => {
  const theme = variantTheme[variant];
  const today = new Date();
 
  const [selectedMonth, setSelectedMonth] = useState(today.getMonth());
  const [selectedYear, setSelectedYear] = useState(today.getFullYear());
  const [currentDate, setCurrentDate] = useState(today);
  const [hoveredDate, setHoveredDate] = useState<Date | null>(null);
 
  // Generate years from MIN_YEAR to MAX_YEAR
  const YEARS = getYears(MIN_YEAR, MAX_YEAR);
 
  const goLiveDate = parseDateFromYYYYMMDD(ENV.GO_LIVE_DATE);
 
  useEffect(() => {
    if (selectedRanges.length > 0) {
      const firstRange = selectedRanges[0]!;
      const firstDate = firstRange.from;
      setSelectedMonth(firstDate.getMonth());
      setSelectedYear(firstDate.getFullYear());
      setCurrentDate(new Date(firstDate.getFullYear(), firstDate.getMonth()));
    }
  }, [selectedRanges]);
 
  const handleMonthChange = useCallback(
    (month: Months) => {
      const monthIndex = MONTHS.indexOf(month);
      setSelectedMonth(monthIndex);
      setCurrentDate(new Date(selectedYear, monthIndex));
    },
    [selectedYear],
  );
 
  const handleYearChange = useCallback(
    (year: string) => {
      const yearNum = Number.parseInt(year);
      setSelectedYear(yearNum);
      setCurrentDate(new Date(yearNum, selectedMonth));
    },
    [selectedMonth],
  );
 
  const handleSelect = (date?: Date) => {
    if (!date) return;
 
    const range = getMondayToFridayRange(new Date(date));
    const weekEndDate = new Date(range.to).setHours(23, 59, 59, 999);
 
    // Prevent future weeks
    if (weekEndDate > today.getTime()) return;
 
    const newRange: DateRange = {
      from: new Date(range.from),
      to: new Date(weekEndDate),
    };
 
    // Prevent selecting an already selected week
    const alreadySelected = selectedRanges.some(
      (r) =>
        r.from.toDateString() === newRange.from.toDateString() &&
        r.to.toDateString() === newRange.to.toDateString(),
    );
    if (alreadySelected) return;
 
    // Prevent selecting more than 3 weeks
    if (selectedRanges.length >= 3) return;
 
    const updated = [...selectedRanges, newRange];
    onChange?.(updated);
    onDone?.();
  };
 
  const hoveredWeek = hoveredDate ? getMondayToFridayRange(hoveredDate) : null;
 
  return (
    <div
      data-testid="day-calendar"
      data-variant={variant}
      className={combineClasses(theme.root, className)}
    >
      <div className={theme.selectors}>
        {/* Month Selector */}
        <Select value={MONTHS[selectedMonth]} onValueChange={handleMonthChange}>
          <SelectTrigger id="month-selector" className={theme.selectTrigger}>
            <SelectValue />
          </SelectTrigger>
          <SelectContent className={theme.selectContent}>
            {MONTHS.map((month) => (
              <SelectItem
                className={theme.selectItem}
                key={month}
                value={month}
              >
                {month}
              </SelectItem>
            ))}
          </SelectContent>
        </Select>
 
        {/* Year Selector */}
        <Select
          value={selectedYear.toString()}
          onValueChange={handleYearChange}
        >
          <SelectTrigger id="year-selector" className={theme.selectTrigger}>
            <SelectValue />
          </SelectTrigger>
          <SelectContent className={theme.selectContent}>
            {YEARS.map((year) => (
              <SelectItem
                key={year}
                value={year.toString()}
                disabled={year > today.getFullYear()}
                className={theme.selectItem}
              >
                {year}
              </SelectItem>
            ))}
          </SelectContent>
        </Select>
      </div>
 
      {/* Calendar */}
      <div className={theme.calendarContainer}>
        <CalendarShadcn
          mode="single"
          onSelect={handleSelect}
          month={currentDate}
          onMonthChange={setCurrentDate}
          showOutsideDays
          className={theme.calendar}
          classNames={dayCalendarClassNames}
          disabled={[
            ...getDisabledMatchers(today),
            ...(goLiveDate ? [{ before: goLiveDate }] : []),
          ]}
          modifiers={{
            // 1st week
            firstWeekStart: selectedRanges[0]?.from,
            firstWeekEnd: selectedRanges[0]?.to,
            firstWeekMiddle: selectedRanges[0]
              ? {
                  from: addDays(selectedRanges[0].from, 1),
                  to: addDays(selectedRanges[0].to, -1),
                }
              : undefined,
 
            // 2nd week
            secondWeekStart: selectedRanges[1]?.from,
            secondWeekEnd: selectedRanges[1]?.to,
            secondWeekMiddle: selectedRanges[1]
              ? {
                  from: addDays(selectedRanges[1].from, 1),
                  to: addDays(selectedRanges[1].to, -1),
                }
              : undefined,
 
            // 3rd week
            thirdWeekStart: selectedRanges[2]?.from,
            thirdWeekEnd: selectedRanges[2]?.to,
            thirdWeekMiddle: selectedRanges[2]
              ? {
                  from: addDays(selectedRanges[2].from, 1),
                  to: addDays(selectedRanges[2].to, -1),
                }
              : undefined,
 
            // hover
            hoverWeekStart: hoveredWeek?.from,
            hoverWeekEnd: hoveredWeek?.to,
            hoverWeekMiddle: hoveredWeek
              ? {
                  from: addDays(hoveredWeek.from, 1),
                  to: addDays(hoveredWeek.to, -1),
                }
              : undefined,
          }}
          onDayMouseEnter={(date, modifiers, e) => {
            if (e.buttons === 0) {
              setHoveredDate(date ?? null);
            }
          }}
          onDayMouseLeave={() => setHoveredDate(null)}
          components={{
            Weekday: ({ children, ...props }) => (
              <th
                {...props}
                className={combineClasses(
                  theme.weekday,
                  (children === DAYS.SU || children === DAYS.SA) &&
                    theme.weekdayWeekend,
                )}
              >
                {children}
              </th>
            ),
          }}
        />
      </div>
    </div>
  );
};