Week Strip Calendar

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import { type ClassValue, clsx } from "clsx";
import { twMerge } from "tailwind-merge";
 
export function cn(...inputs: ClassValue[]) {
  return twMerge(clsx(inputs));
}

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"use client";
 
import {
  forwardRef,
  useMemo,
  useState,
  type ComponentPropsWithoutRef,
} from "react";
 
import { cn } from "@/lib/cn";
import { ChevronLeft, ChevronRight } from "lucide-react";
 
function startOfWeek(date: Date) {
  const copy = new Date(date);
  copy.setDate(copy.getDate() - copy.getDay());
  copy.setHours(0, 0, 0, 0);
  return copy;
}
 
function addDays(date: Date, days: number) {
  const copy = new Date(date);
  copy.setDate(copy.getDate() + days);
  return copy;
}
 
function startOfDay(date: Date) {
  const copy = new Date(date);
  copy.setHours(0, 0, 0, 0);
  return copy;
}
 
function isSameDate(a: Date, b: Date) {
  return (
    a.getFullYear() === b.getFullYear() &&
    a.getMonth() === b.getMonth() &&
    a.getDate() === b.getDate()
  );
}
 
export type WeekStripCalendarProps = Readonly<
  {
    onSelect?: (date: Date) => void;
  } & ComponentPropsWithoutRef<"div">
>;
 
// Week strip — swipe weeks with arrows, tap a day to select it.
export const WeekStripCalendar = forwardRef<HTMLDivElement, WeekStripCalendarProps>(
  ({ className, onSelect, ...props }, ref) => {
    const today = useMemo(() => startOfDay(new Date()), []);
    const [weekStart, setWeekStart] = useState(() => startOfWeek(today));
    const [selected, setSelected] = useState(today);
    const [slideDirection, setSlideDirection] = useState(0);
 
    const days = useMemo(
      () => Array.from({ length: 7 }, (_, index) => addDays(weekStart, index)),
      [weekStart],
    );
 
    const monthLabel = days[3]?.toLocaleDateString("en-US", {
      month: "long",
      year: "numeric",
    });
 
    const rangeLabel = `${days[0]?.toLocaleDateString("en-US", { month: "short", day: "numeric" })} – ${days[6]?.toLocaleDateString("en-US", { month: "short", day: "numeric" })}`;
 
    const selectDay = (date: Date) => {
      setSelected(startOfDay(date));
      onSelect?.(startOfDay(date));
    };
 
    const goPrevWeek = () => {
      setSlideDirection(-1);
      setWeekStart((prev) => addDays(prev, -7));
    };
 
    const goNextWeek = () => {
      setSlideDirection(1);
      setWeekStart((prev) => addDays(prev, 7));
    };
 
    return (
      <div
        ref={ref}
        data-slot="week-strip-calendar"
        className={cn(
          "w-80 overflow-hidden rounded-2xl border border-neutral-100 bg-white px-5 py-4 font-sans select-none",
          "shadow-[0_0_0_1px_rgba(0,0,0,0.04),0_1px_2px_rgba(0,0,0,0.05),0_4px_8px_rgba(0,0,0,0.06),0_12px_24px_rgba(0,0,0,0.04)]",
          className,
        )}
        {...props}
      >
        <div className="mb-1 flex items-center justify-between">
          <p className="text-sm font-semibold text-neutral-900">{monthLabel}</p>
          <div className="flex items-center gap-0.5">
            <button
              type="button"
              aria-label="Previous week"
              onClick={goPrevWeek}
              className="flex size-8 cursor-pointer items-center justify-center rounded-full text-neutral-500 outline-none transition-colors duration-150 hover:bg-neutral-100 hover:text-neutral-900 focus-visible:outline-2 focus-visible:outline-offset-1 focus-visible:outline-neutral-800"
            >
              <ChevronLeft size={16} strokeWidth={2} aria-hidden />
            </button>
            <button
              type="button"
              aria-label="Next week"
              onClick={goNextWeek}
              className="flex size-8 cursor-pointer items-center justify-center rounded-full text-neutral-500 outline-none transition-colors duration-150 hover:bg-neutral-100 hover:text-neutral-900 focus-visible:outline-2 focus-visible:outline-offset-1 focus-visible:outline-neutral-800"
            >
              <ChevronRight size={16} strokeWidth={2} aria-hidden />
            </button>
          </div>
        </div>
 
        <p
          key={rangeLabel}
          className="mb-4 text-xs font-medium text-neutral-500 opacity-100 transition-opacity duration-300 ease-out starting:opacity-0"
        >
          {rangeLabel}
        </p>
 
        <div
          key={weekStart.toISOString()}
          className={cn(
            "grid grid-cols-7 opacity-100 transition-all duration-300 ease-[cubic-bezier(0.25,0.46,0.45,0.94)] starting:opacity-0",
            slideDirection >= 0
              ? "starting:translate-x-2"
              : "starting:-translate-x-2",
          )}
        >
          {days.map((date) => {
            const isSelected = isSameDate(date, selected);
            const isToday = isSameDate(date, today);
 
            return (
              <button
                key={date.toISOString()}
                type="button"
                aria-pressed={isSelected}
                onClick={() => selectDay(date)}
                className="group flex cursor-pointer flex-col items-center gap-1.5 outline-none"
              >
                <span
                  className={cn(
                    "text-[10px] font-medium tracking-wide uppercase",
                    isSelected ? "text-neutral-800" : "text-neutral-400",
                  )}
                >
                  {date.toLocaleDateString("en-US", { weekday: "narrow" })}
                </span>
                <span
                  className={cn(
                    "relative flex size-9 items-center justify-center rounded-full text-sm font-medium tabular-nums",
                    "transition-colors duration-150",
                    "group-focus-visible:outline-2 group-focus-visible:outline-offset-1 group-focus-visible:outline-neutral-800",
                    isSelected && "bg-neutral-800 font-semibold text-white",
                    !isSelected &&
                      isToday &&
                      "bg-neutral-100 font-semibold text-neutral-800 group-hover:bg-neutral-200",
                    !isSelected &&
                      !isToday &&
                      "text-neutral-700 group-hover:bg-neutral-100",
                  )}
                >
                  {date.getDate()}
                  {isToday && !isSelected && (
                    <span
                      aria-hidden
                      className="absolute -bottom-0.5 left-1/2 size-1 -translate-x-1/2 rounded-full bg-neutral-800"
                    />
                  )}
                </span>
              </button>
            );
          })}
        </div>
      </div>
    );
  },
);
 
WeekStripCalendar.displayName = "WeekStripCalendar";