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

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'use client';
 
import { useCallback, useEffect, useMemo, useState } from 'react';
 
import { CURRENT_YEAR, ENV, MIN_YEAR } from '@/constants';
import { BaseVariant } from '@/types';
import {
  getDecadeYears,
  parseDateFromYYYYMMDD,
  toggleYearSelection,
} from '@/utils/calendar';
import { combineClasses } from '@shared/utils';
 
import { Button } from '@/components/Calendar/Shadcn/button';
import { DecadeNavigator } from '@/components/DecadeNavigator';
 
import '../styles/year-calendar.css';
 
// Same color palette as MonthCalendar
const selectionColors = ['bg-blue-500', 'bg-secondary-350', 'bg-secondary-400'];
 
interface YearCalendarProps {
  selectedYears?: number[];
  minYear?: number;
  maxYear?: number; // default = current year
  onYearsChange?: (years: number[]) => void;
  className?: string;
  variant?: BaseVariant;
}
 
const variantTheme = {
  [BaseVariant.PRIMARY]: {
    root: 'year-calendar',
    yearGrid: 'year-calendar-grid',
    yearButton: 'year-calendar-button',
    yearButtonSelected: 'year-calendar-button-selected',
    yearButtonDisabled: 'year-calendar-button-disabled',
    yearButtonDefault: 'year-calendar-button-default',
  },
} as const;
 
export const YearCalendar = ({
  selectedYears = [],
  minYear = MIN_YEAR,
  maxYear = CURRENT_YEAR,
  onYearsChange,
  className,
  variant = BaseVariant.PRIMARY,
}: YearCalendarProps) => {
  const theme = variantTheme[variant];
  const [selected, setSelected] = useState<number[]>(selectedYears);
 
  const goLiveDate = parseDateFromYYYYMMDD(ENV.GO_LIVE_DATE);
  const goLiveYear = goLiveDate ? goLiveDate.getFullYear() : MIN_YEAR;
  const firstSelectedYear = selectedYears[0] ?? CURRENT_YEAR;
 
  // Track decade separately
  const [decadeStart, setDecadeStart] = useState(
    () => Math.floor(firstSelectedYear / 10) * 10,
  );
 
  const decadeYears = useMemo(() => getDecadeYears(decadeStart), [decadeStart]);
 
  useEffect(() => {
    setSelected(selectedYears);
 
    if (selectedYears.length > 0) {
      const yearToShow = selectedYears[0]!;
      setDecadeStart(Math.floor(yearToShow / 10) * 10);
    }
  }, [selectedYears]);
 
  const toggleYear = useCallback(
    (year: number) => {
      if (selected.includes(year)) return;
 
      const updated = toggleYearSelection({ selected, year, minYear, maxYear });
      setSelected(updated);
      onYearsChange?.(updated);
    },
    [selected, minYear, maxYear, onYearsChange],
  );
 
  const handleNextDecade = useCallback(() => {
    setDecadeStart((prev) => prev + 10);
  }, []);
 
  const handlePreviousDecade = useCallback(() => {
    setDecadeStart((prev) => prev - 10);
  }, []);
 
  const isYearDisabled = useCallback(
    (year: number) =>
      year > maxYear ||
      year < minYear ||
      year < goLiveYear ||
      year === CURRENT_YEAR,
    [maxYear, minYear, goLiveYear],
  );
 
  const yearClickHandlers = useMemo(() => {
    return decadeYears.map((year) => {
      return () => {
        const isSelected = selected.includes(year);
        if (isYearDisabled(year) || isSelected) return;
        toggleYear(year);
      };
    });
  }, [decadeYears, selected, minYear, maxYear, toggleYear]);
 
  return (
    <div
      data-testid="year-calendar"
      data-variant={variant}
      className={combineClasses(theme.root, className)}
    >
      {/* Decade Navigation */}
      <DecadeNavigator
        decadeStart={decadeStart}
        minYear={minYear}
        maxYear={maxYear}
        onPrevious={handlePreviousDecade}
        onNext={handleNextDecade}
      />
 
      {/* Year Grid */}
      <div className={theme.yearGrid}>
        {decadeYears.map((year, index) => {
          const isSelected = selected.includes(year);
 
          let bgColor = '';
          if (isSelected) {
            const order = selected.indexOf(year);
            if (order >= 0) bgColor = selectionColors[order] ?? '';
          }
 
          return (
            <Button
              data-testid="year-option"
              key={year}
              variant="ghost"
              onClick={yearClickHandlers[index]}
              disabled={isYearDisabled(year)}
              className={combineClasses(
                theme.yearButton,
                isSelected
                  ? combineClasses(
                      bgColor,
                      `hover:${bgColor}`,
                      theme.yearButtonSelected,
                    )
                  : isYearDisabled(year)
                    ? theme.yearButtonDisabled
                    : theme.yearButtonDefault,
              )}
            >
              {year}
            </Button>
          );
        })}
      </div>
    </div>
  );
};