Phone Field Input

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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,
  useCallback,
  useId,
  useState,
  type ChangeEvent,
  type ComponentPropsWithoutRef,
} from "react";
 
import { cn } from "@/lib/cn";
 
export type PhoneFieldInputProps = Readonly<
  {
    label?: string;
    hint?: string;
    error?: boolean;
    errorMessage?: string;
    dialCode?: string;
    containerClassName?: string;
  } & Omit<ComponentPropsWithoutRef<"input">, "size" | "type" | "onChange">
> & {
  onChange?: (value: string, event: ChangeEvent<HTMLInputElement>) => void;
};
 
function formatPhoneDisplay(raw: string, dialCode: string): string {
  const digits = raw.replace(/\D/g, "").slice(0, 15);
  if (dialCode.replace(/\s/g, "") !== "+1") return digits;
  if (digits.length <= 3) return digits;
  if (digits.length <= 6) {
    return `(${digits.slice(0, 3)}) ${digits.slice(3)}`;
  }
  return `(${digits.slice(0, 3)}) ${digits.slice(3, 6)}-${digits.slice(6)}`;
}
 
function digitsOnly(raw: string): string {
  return raw.replace(/\D/g, "").slice(0, 15);
}
 
export const PhoneFieldInput = forwardRef<HTMLInputElement, PhoneFieldInputProps>(
  function PhoneFieldInput(
    {
      className,
      containerClassName,
      id,
      label = "Phone number",
      hint = "We will send a verification code by SMS.",
      error = false,
      errorMessage = "Enter a valid phone number.",
      dialCode = "+1",
      disabled,
      required,
      value,
      defaultValue = "",
      autoComplete = "tel-national",
      onChange,
      ...props
    },
    ref,
  ) {
    const generatedId = useId();
    const inputId = id ?? generatedId;
    const hintId = `${inputId}-hint`;
    const errorId = `${inputId}-error`;
 
    const isControlled = value !== undefined;
    const [internal, setInternal] = useState(() => digitsOnly(String(defaultValue)));
    const display = isControlled
      ? formatPhoneDisplay(String(value), dialCode)
      : formatPhoneDisplay(internal, dialCode);
 
    const handleChange = useCallback(
      (event: ChangeEvent<HTMLInputElement>) => {
        const nextRaw = digitsOnly(event.target.value);
        if (!isControlled) setInternal(nextRaw);
        onChange?.(nextRaw, event);
      },
      [isControlled, onChange],
    );
 
    return (
      <div
        data-slot="phone-field-input"
        data-error={error || undefined}
        className={cn("w-full max-w-sm font-sans", containerClassName)}
      >
        <label
          htmlFor={inputId}
          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>
 
        <div
          className={cn(
            "flex overflow-hidden rounded-lg border bg-white transition-[border-color] duration-200",
            error
              ? "border-rose-300 focus-within:border-rose-400"
              : "border-neutral-200 focus-within:border-neutral-900",
            disabled && "bg-neutral-50",
          )}
        >
          <span
            aria-hidden
            className={cn(
              "flex shrink-0 items-center border-r border-neutral-200 bg-neutral-50 px-3 font-mono text-sm text-neutral-600",
              disabled && "text-neutral-400",
            )}
          >
            {dialCode}
          </span>
 
          <input
            ref={ref}
            id={inputId}
            type="tel"
            inputMode="tel"
            autoComplete={autoComplete}
            disabled={disabled}
            required={required}
            value={display}
            aria-invalid={error || undefined}
            aria-describedby={
              error ? errorId : hint ? hintId : undefined
            }
            placeholder="(555) 000-0000"
            onChange={handleChange}
            className={cn(
              "h-10 min-w-0 flex-1 bg-transparent px-3.5 font-sans text-sm text-neutral-900 outline-none ring-0 placeholder:text-neutral-400 focus:ring-0 disabled:cursor-not-allowed disabled:text-neutral-400",
              className,
            )}
            {...props}
          />
        </div>
 
        {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>
    );
  },
);
 
PhoneFieldInput.displayName = "PhoneFieldInput";