Date Field Input

1
2
3
4
5
6
import { type ClassValue, clsx } from "clsx";
import { twMerge } from "tailwind-merge";
 
export function cn(...inputs: ClassValue[]) {
  return twMerge(clsx(inputs));
}

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
"use client";
 
import {
  forwardRef,
  useCallback,
  useEffect,
  useId,
  useMemo,
  useRef,
  useState,
  type ChangeEvent,
  type ComponentPropsWithoutRef,
  type KeyboardEvent,
  type MutableRefObject,
  type Ref,
} from "react";
 
import { Calendar, ChevronLeft, ChevronRight } from "lucide-react";
 
import { cn } from "@/lib/cn";
 
export type DateFieldInputProps = Readonly<
  {
    label?: string;
    hint?: string;
    error?: boolean;
    errorMessage?: string;
    placeholder?: string;
    containerClassName?: string;
    openPickerLabel?: string;
    name?: string;
    required?: boolean;
    onValueChange?: (value: string) => void;
  } & Omit<
    ComponentPropsWithoutRef<"button">,
    "size" | "type" | "value" | "defaultValue" | "onChange" | "children"
  >
> & {
  value?: string;
  defaultValue?: string;
  min?: string;
  max?: string;
  onChange?: (event: ChangeEvent<HTMLInputElement>) => void;
};
 
const WEEKDAYS = ["Su", "Mo", "Tu", "We", "Th", "Fr", "Sa"] as const;
 
function mergeRefs<T>(...refs: Array<Ref<T> | undefined>) {
  return (node: T | null) => {
    for (const ref of refs) {
      if (!ref) continue;
      if (typeof ref === "function") ref(node);
      else (ref as MutableRefObject<T | null>).current = node;
    }
  };
}
 
function parseIsoDate(value: string): Date | null {
  const match = /^(\d{4})-(\d{2})-(\d{2})$/.exec(value);
  if (!match) return null;
  const year = Number(match[1]);
  const month = Number(match[2]);
  const day = Number(match[3]);
  const date = new Date(year, month - 1, day);
  if (
    date.getFullYear() !== year ||
    date.getMonth() !== month - 1 ||
    date.getDate() !== day
  ) {
    return null;
  }
  return date;
}
 
function toIsoDate(date: Date): string {
  const year = date.getFullYear();
  const month = String(date.getMonth() + 1).padStart(2, "0");
  const day = String(date.getDate()).padStart(2, "0");
  return `${year}-${month}-${day}`;
}
 
function formatDisplayDate(value: string): string {
  const date = parseIsoDate(value);
  if (!date) return value;
  return date.toLocaleDateString(undefined, {
    weekday: "short",
    year: "numeric",
    month: "short",
    day: "numeric",
  });
}
 
function isSameDay(a: Date, b: Date): boolean {
  return (
    a.getFullYear() === b.getFullYear() &&
    a.getMonth() === b.getMonth() &&
    a.getDate() === b.getDate()
  );
}
 
function startOfMonth(date: Date): Date {
  return new Date(date.getFullYear(), date.getMonth(), 1);
}
 
function addMonths(date: Date, count: number): Date {
  return new Date(date.getFullYear(), date.getMonth() + count, 1);
}
 
function buildMonthGrid(month: Date): Date[] {
  const first = startOfMonth(month);
  const start = new Date(first);
  start.setDate(first.getDate() - first.getDay());
 
  return Array.from({ length: 42 }, (_, index) => {
    const day = new Date(start);
    day.setDate(start.getDate() + index);
    return day;
  });
}
 
function isDisabledDay(day: Date, min?: string, max?: string): boolean {
  const minDate = min ? parseIsoDate(min) : null;
  const maxDate = max ? parseIsoDate(max) : null;
  const time = new Date(day.getFullYear(), day.getMonth(), day.getDate()).getTime();
  if (minDate && time < minDate.getTime()) return true;
  if (maxDate && time > maxDate.getTime()) return true;
  return false;
}
 
export const DateFieldInput = forwardRef<HTMLButtonElement, DateFieldInputProps>(
  function DateFieldInput(
    {
      className,
      containerClassName,
      id,
      label = "Date of birth",
      hint,
      error = false,
      errorMessage = "Enter a valid date.",
      placeholder = "Select a date",
      openPickerLabel = "Open calendar",
      disabled,
      required,
      name,
      value,
      defaultValue = "",
      min,
      max,
      onChange,
      onValueChange,
      onClick,
      onBlur,
      onKeyDown,
      ...props
    },
    ref,
  ) {
    const generatedId = useId();
    const fieldId = id ?? generatedId;
    const calendarId = `${fieldId}-calendar`;
    const hintId = `${fieldId}-hint`;
    const errorId = `${fieldId}-error`;
    const rootRef = useRef<HTMLDivElement | null>(null);
    const triggerRef = useRef<HTMLButtonElement | null>(null);
    const today = useMemo(() => new Date(), []);
 
    const isControlled = value !== undefined;
    const [internal, setInternal] = useState(String(defaultValue));
    const [open, setOpen] = useState(false);
    const [viewMonth, setViewMonth] = useState(() => {
      const initial = parseIsoDate(isControlled ? String(value ?? "") : String(defaultValue));
      return startOfMonth(initial ?? today);
    });
 
    const current = isControlled ? String(value ?? "") : internal;
    const selectedDate = parseIsoDate(current);
    const hasValue = current.length > 0;
    const monthDays = useMemo(() => buildMonthGrid(viewMonth), [viewMonth]);
 
    const monthLabel = viewMonth.toLocaleDateString(undefined, {
      month: "long",
      year: "numeric",
    });
 
    const emitChange = useCallback(
      (next: string) => {
        if (!isControlled) setInternal(next);
        onValueChange?.(next);
        onChange?.({ target: { value: next } } as ChangeEvent<HTMLInputElement>);
      },
      [isControlled, onChange, onValueChange],
    );
 
    const close = useCallback(() => setOpen(false), []);
 
    const selectDay = useCallback(
      (day: Date) => {
        if (isDisabledDay(day, min, max)) return;
        const next = toIsoDate(day);
        emitChange(next);
        close();
        triggerRef.current?.focus();
      },
      [close, emitChange, max, min],
    );
 
    useEffect(() => {
      if (!open) return;
 
      function handlePointerDown(event: PointerEvent) {
        if (!rootRef.current?.contains(event.target as Node)) close();
      }
 
      function handleEscape(event: globalThis.KeyboardEvent) {
        if (event.key === "Escape") {
          close();
          triggerRef.current?.focus();
        }
      }
 
      document.addEventListener("pointerdown", handlePointerDown);
      document.addEventListener("keydown", handleEscape);
      return () => {
        document.removeEventListener("pointerdown", handlePointerDown);
        document.removeEventListener("keydown", handleEscape);
      };
    }, [close, open]);
 
    const handleTriggerKeyDown = useCallback(
      (event: KeyboardEvent<HTMLButtonElement>) => {
        onKeyDown?.(event);
        if (event.defaultPrevented || disabled) return;
        if (event.key === "Enter" || event.key === " " || event.key === "ArrowDown") {
          event.preventDefault();
          if (!open) {
            if (selectedDate) setViewMonth(startOfMonth(selectedDate));
            setOpen(true);
          }
        }
      },
      [disabled, onKeyDown, open, selectedDate],
    );
 
    return (
      <div
        ref={rootRef}
        data-slot="date-field-input"
        data-error={error || undefined}
        data-open={open || undefined}
        className={cn("relative w-full max-w-sm font-sans", containerClassName)}
      >
        <input
          type="text"
          name={name}
          value={current}
          disabled={disabled}
          required={required}
          aria-invalid={error || undefined}
          tabIndex={-1}
          aria-hidden
          onInvalid={(event) => {
            event.preventDefault();
            triggerRef.current?.focus();
          }}
          className="sr-only"
          readOnly
        />
 
        <label
          htmlFor={fieldId}
          className="mb-1.5 block text-sm font-medium text-neutral-900"
        >
          {label}
          {required ? (
            <span className="ml-0.5 text-rose-500" aria-hidden>
              *
            </span>
          ) : null}
        </label>
 
        <button
          ref={mergeRefs(ref, triggerRef)}
          id={fieldId}
          type="button"
          disabled={disabled}
          aria-haspopup="dialog"
          aria-expanded={open}
          aria-controls={calendarId}
          aria-label={`${openPickerLabel}: ${label}`}
          aria-describedby={error ? errorId : hint ? hintId : undefined}
          onClick={(event) => {
            onClick?.(event);
            if (event.defaultPrevented || disabled) return;
            if (open) close();
            else {
              if (selectedDate) setViewMonth(startOfMonth(selectedDate));
              setOpen(true);
            }
          }}
          onBlur={(event) => {
            onBlur?.(event);
            if (event.defaultPrevented) return;
            window.requestAnimationFrame(() => {
              if (!rootRef.current?.contains(document.activeElement)) close();
            });
          }}
          onKeyDown={handleTriggerKeyDown}
          className={cn(
            "flex h-10 w-full cursor-pointer items-center justify-between gap-2 rounded-lg border bg-white px-3.5 text-left font-sans text-sm outline-none ring-0 transition-[border-color] duration-200 focus:ring-0 disabled:cursor-not-allowed disabled:bg-neutral-50 disabled:text-neutral-400",
            hasValue ? "text-neutral-900" : "text-neutral-400",
            error
              ? "border-rose-300 focus:border-rose-400"
              : open
                ? "border-neutral-900"
                : "border-neutral-200 focus:border-neutral-900",
            className,
          )}
          {...props}
        >
          <span className="truncate">
            {hasValue ? formatDisplayDate(current) : placeholder}
          </span>
          <Calendar size={16} strokeWidth={2} aria-hidden className="shrink-0 text-neutral-400" />
        </button>
 
        {open ? (
          <div
            id={calendarId}
            role="dialog"
            aria-label={`${label} calendar`}
            className="absolute z-20 mt-1.5 w-full rounded-xl border border-neutral-200 bg-white p-3 shadow-sm"
          >
            <div className="mb-3 flex items-center justify-between">
              <p className="text-sm font-semibold text-neutral-900">{monthLabel}</p>
              <div className="flex gap-0.5">
                <button
                  type="button"
                  aria-label="Previous month"
                  onClick={() => setViewMonth((prev) => addMonths(prev, -1))}
                  className="flex size-7 cursor-pointer items-center justify-center rounded-md text-neutral-500 transition-colors hover:bg-neutral-100 hover:text-neutral-900"
                >
                  <ChevronLeft size={14} strokeWidth={2} aria-hidden />
                </button>
                <button
                  type="button"
                  aria-label="Next month"
                  onClick={() => setViewMonth((prev) => addMonths(prev, 1))}
                  className="flex size-7 cursor-pointer items-center justify-center rounded-md text-neutral-500 transition-colors hover:bg-neutral-100 hover:text-neutral-900"
                >
                  <ChevronRight size={14} strokeWidth={2} aria-hidden />
                </button>
              </div>
            </div>
 
            <div className="mb-1 grid grid-cols-7 gap-0.5">
              {WEEKDAYS.map((day) => (
                <span
                  key={day}
                  className="py-1 text-center text-[10px] font-medium tracking-wide text-neutral-400 uppercase"
                >
                  {day}
                </span>
              ))}
            </div>
 
            <div className="grid grid-cols-7 gap-0.5">
              {monthDays.map((day) => {
                const iso = toIsoDate(day);
                const inMonth = day.getMonth() === viewMonth.getMonth();
                const isSelected = selectedDate ? isSameDay(day, selectedDate) : false;
                const isToday = isSameDay(day, today);
                const isDisabled = isDisabledDay(day, min, max);
 
                return (
                  <button
                    key={iso}
                    type="button"
                    disabled={isDisabled}
                    aria-label={day.toLocaleDateString(undefined, {
                      weekday: "long",
                      month: "long",
                      day: "numeric",
                      year: "numeric",
                    })}
                    aria-pressed={isSelected}
                    onClick={() => selectDay(day)}
                    className={cn(
                      "flex h-9 cursor-pointer items-center justify-center rounded-lg text-sm transition-colors duration-150 outline-none ring-0 focus:ring-0",
                      !inMonth && "text-neutral-300",
                      inMonth && !isSelected && !isDisabled && "text-neutral-700 hover:bg-neutral-50",
                      isToday && !isSelected && inMonth && "font-semibold text-neutral-900",
                      isSelected && "bg-neutral-900 font-medium text-white hover:bg-neutral-800",
                      isDisabled && "cursor-not-allowed text-neutral-300 hover:bg-transparent",
                    )}
                  >
                    {day.getDate()}
                  </button>
                );
              })}
            </div>
 
            <div className="mt-3 flex items-center justify-between border-t border-neutral-100 pt-3">
              <button
                type="button"
                onClick={() => {
                  if (!isDisabledDay(today, min, max)) selectDay(today);
                }}
                disabled={isDisabledDay(today, min, max)}
                className="cursor-pointer text-xs font-medium text-neutral-700 underline-offset-2 transition-colors hover:text-neutral-900 hover:underline disabled:cursor-not-allowed disabled:text-neutral-300"
              >
                Today
              </button>
 
              {hasValue ? (
                <button
                  type="button"
                  onClick={() => {
                    emitChange("");
                    close();
                  }}
                  className="cursor-pointer text-xs font-medium text-neutral-500 underline-offset-2 transition-colors hover:text-neutral-900 hover:underline"
                >
                  Clear
                </button>
              ) : null}
            </div>
          </div>
        ) : null}
 
        {error ? (
          <p id={errorId} role="alert" className="mt-1.5 text-xs text-rose-600">
            {errorMessage}
          </p>
        ) : hint ? (
          <p id={hintId} className="mt-1.5 text-xs text-neutral-500">
            {hint}
          </p>
        ) : null}
      </div>
    );
  },
);
 
DateFieldInput.displayName = "DateFieldInput";