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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>
);
};
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