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import { useCallback, useEffect, useMemo, useState } from 'react';
import { CURRENT_YEAR, MONTHS } from '@/constants/calendar';
import { ENV } from '@/constants/env';
import { ChartMode } from '@/types';
import { combineClasses } from '@shared/utils';
import {
getQuarterKey,
getQuarterMonths,
isMonthSelected,
toggleSingleMonth,
getQuarterBgStyle,
isIncompleteMonth,
parseTimeRangeToMonths,
parseDateFromYYYYMMDD,
} from '@/utils/calendar';
import { Button } from '@/components/Calendar/Shadcn/button';
import { ChevronIcon } from '@/components/icons/reacts';
interface MonthYearPickerProps {
selectedMonths?: { year: number; month: number }[];
selectedYear?: number;
mode: ChartMode.Month | ChartMode.Quarter;
onMonthsChange?: (months: { year: number; month: number }[]) => void;
onYearChange?: (year: number) => void;
onCancel?: () => void;
onDone?: () => void;
timeRange?: string;
}
export const MonthCalendar = ({
selectedMonths,
selectedYear = CURRENT_YEAR,
mode = ChartMode.Month,
onMonthsChange,
onYearChange,
timeRange,
}: MonthYearPickerProps) => {
const today = new Date();
const currentYearActual = today.getFullYear();
const [currentYear, setCurrentYear] = useState(selectedYear);
const [selected, setSelected] = useState<{ year: number; month: number }[]>(
selectedMonths || [],
);
const [hoveredQuarter, setHoveredQuarter] = useState<number | null>(null);
useEffect(() => {
const initMonths = selectedMonths
? selectedMonths
: parseTimeRangeToMonths(timeRange, mode);
setSelected(initMonths);
if (initMonths.length > 0) {
setCurrentYear(initMonths[0]!.year);
}
}, [selectedMonths, timeRange, mode]);
const goLiveDate = parseDateFromYYYYMMDD(ENV.GO_LIVE_DATE);
const isBeforeGoLive = useCallback((year: number, month: number) => {
if (!goLiveDate) return false;
const compare = new Date(year, month, 1);
return compare < goLiveDate;
}, []);
const selectedQuarterKeys = useMemo(() => {
const keys: string[] = [];
selected.forEach(({ year, month }) => {
const key = getQuarterKey(year, month);
if (!keys.includes(key)) keys.push(key);
});
return keys;
}, [selected]);
const handlePreviousYear = useCallback(() => {
const newYear = currentYear - 1;
setCurrentYear(newYear);
onYearChange?.(newYear);
}, [currentYear, onYearChange]);
const handleNextYear = useCallback(() => {
if (currentYear < currentYearActual) {
const newYear = currentYear + 1;
setCurrentYear(newYear);
onYearChange?.(newYear);
}
}, [currentYear, currentYearActual, onYearChange]);
const toggleMonthHandler = useCallback(
(monthIndex: number) => {
if (isBeforeGoLive(currentYear, monthIndex)) return;
// Existing future/incomplete check
if (mode === ChartMode.Quarter) {
const quarterMonths = getQuarterMonths(monthIndex);
const hasIncomplete = quarterMonths.some((m) =>
isIncompleteMonth(currentYear, m, today),
);
if (hasIncomplete) return;
} else if (mode === ChartMode.Month) {
if (isIncompleteMonth(currentYear, monthIndex, today)) return;
}
let updated: { year: number; month: number }[] = [...selected];
if (mode === ChartMode.Quarter) {
const quarterMonths = getQuarterMonths(monthIndex);
const isQuarterSelected = quarterMonths.every((m) =>
selected.some((s) => s.year === currentYear && s.month === m),
);
if (isQuarterSelected) return;
quarterMonths.forEach((m) => {
if (!updated.some((s) => s.year === currentYear && s.month === m)) {
updated.push({ year: currentYear, month: m });
}
});
} else {
updated = toggleSingleMonth(currentYear, monthIndex, selected);
}
setSelected(updated);
onMonthsChange?.(updated);
},
[currentYear, mode, selected, onMonthsChange, today, isBeforeGoLive],
);
const monthClickHandlers = useMemo(() => {
return MONTHS.map((_, index) => () => {
if (isBeforeGoLive(currentYear, index)) return;
const alreadySelected = isMonthSelected(currentYear, index, selected);
const incomplete = isIncompleteMonth(currentYear, index, today);
if (alreadySelected || incomplete) return;
toggleMonthHandler(index);
});
}, [currentYear, selected, toggleMonthHandler, today, isBeforeGoLive]);
return (
<div
data-testid="month-calendar"
className="bg-white rounded-xl pt-3.75 pb-5 px-4 border border-secondary-300 w-[222px] dark:border-slate-700 dark:bg-slate-700"
>
{/* Year Navigation */}
<div className="flex items-center justify-between mb-3.25 max-w-36 w-full mx-auto">
<Button
id="previous-year-button"
variant="ghost"
size="icon"
onClick={handlePreviousYear}
>
<ChevronIcon
direction="left"
width={18}
height={18}
className="text-primary-350"
/>
</Button>
<div
data-testid="calendar-year-label"
className="flex items-center gap-1"
>
{String(currentYear)
.split('')
.map((digit, index) => (
<span
key={index}
data-testid="calendar-year-digit"
className="text-4xs leading-6 font-semibold text-primary-350"
>
{digit}
</span>
))}
</div>
<Button
id="next-year-button"
variant="ghost"
size="icon"
onClick={handleNextYear}
disabled={currentYear >= currentYearActual}
>
<ChevronIcon
direction="right"
width={18}
height={18}
className={
currentYear >= currentYearActual
? 'text-secondary-300'
: 'text-primary-350'
}
/>
</Button>
</div>
{/* Month Grid */}
<div className="grid grid-cols-4 gap-y-[5px] gap-x-4 mb-[11px]">
{MONTHS.map((month, index) => {
const quarterMonths = getQuarterMonths(index);
const isQuarterIncomplete =
mode === ChartMode.Quarter &&
quarterMonths.some((m) => isIncompleteMonth(currentYear, m, today));
const isIncomplete =
mode === ChartMode.Quarter
? isQuarterIncomplete
: isIncompleteMonth(currentYear, index, today);
const beforeGoLive = isBeforeGoLive(currentYear, index);
const { renderBg, bgStyle, bgColor } = getQuarterBgStyle({
index,
quarterMonths,
selectedQuarterKeys,
selectionColors:
selected.length === 1
? ['bg-blue-500']
: ['bg-blue-500', 'bg-secondary-350', 'bg-secondary-400'],
mode,
selected,
currentYear,
hoveredQuarter,
});
const isHovered =
mode === ChartMode.Month
? hoveredQuarter === index
: hoveredQuarter !== null &&
getQuarterMonths(hoveredQuarter).includes(index);
const isDisabled = isIncomplete || beforeGoLive;
return (
<div key={month} className="relative">
{renderBg && (
<div
className={`absolute inset-0 h-full rounded-xl ${bgColor}`}
style={{ ...bgStyle, zIndex: 0 }}
/>
)}
<Button
variant="ghost"
onClick={monthClickHandlers[index]}
onMouseEnter={() => {
if (
!isDisabled &&
(mode === ChartMode.Month || mode === ChartMode.Quarter)
) {
setHoveredQuarter(index);
}
}}
onMouseLeave={() => setHoveredQuarter(null)}
disabled={isDisabled}
data-selected={
isMonthSelected(currentYear, index, selected) || undefined
}
data-hovered={(!isDisabled && isHovered) || undefined}
className={combineClasses(
// Base
'relative z-10 text-4xs leading-6 font-medium dark:text-background transition-all duration-150',
'w-10 h-10 p-0 active:scale-95',
// Apply different corner rounding styles depending on mode and month position
mode === ChartMode.Quarter &&
index % 3 === 0 &&
// First month of the quarter → round left corners only
'rounded-l-xl rounded-r-none',
mode === ChartMode.Quarter &&
index % 3 === 1 &&
// Middle month of the quarter → no rounding (connects seamlessly)
'rounded-none',
mode === ChartMode.Quarter &&
index % 3 === 2 &&
// Last month of the quarter → round right corners only
'rounded-r-xl rounded-l-none',
mode === ChartMode.Month &&
// In Month mode → each button is individually rounded
'rounded-md',
// Selected state → apply bgColor + enforce hover with the same bgColor
isMonthSelected(currentYear, index, selected) &&
`${bgColor} text-white hover:${bgColor} hover:text-white`,
// Disabled (beforeGoLive OR incomplete)
isDisabled && 'text-gray-300 cursor-not-allowed opacity-50',
// Default (not selected, not disabled)
!isMonthSelected(currentYear, index, selected) &&
!isDisabled &&
'text-frost-900',
// Hover state for unselected months
!isDisabled &&
isHovered &&
!isMonthSelected(currentYear, index, selected) &&
'data-[hovered=true]:bg-blue-300 data-[hovered=true]:text-white',
)}
>
{month}
</Button>
</div>
);
})}
</div>
</div>
);
};
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