Contact Form

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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,
  useRef,
  useState,
  type ComponentPropsWithoutRef,
  type FormEvent,
} from "react";
 
import { AlertCircle, ChevronRight, Loader2 } from "lucide-react";
 
import { cn } from "@/lib/cn";
 
const EMAIL_RE = /^[^\s@]+@[^\s@]+\.[^\s@]+$/;
 
type ContactFormValues = Readonly<{
  name: string;
  email: string;
  subject: string;
  message: string;
}>;
 
type ContactFormErrors = Partial<Record<keyof ContactFormValues, string>>;
 
export type ContactFormProps = Readonly<
  {
    title?: string;
    subtitle?: string;
    submitLabel?: string;
    successTitle?: string;
    successMessage?: string;
    submitErrorMessage?: string;
    maxMessageLength?: number;
    loading?: boolean;
    onSubmit?: (values: ContactFormValues) => void | Promise<void>;
  } & Omit<ComponentPropsWithoutRef<"form">, "onSubmit">
>;
 
function validateContact(
  values: ContactFormValues,
  maxLength: number,
): ContactFormErrors {
  const errors: ContactFormErrors = {};
  const name = values.name.trim();
  const email = values.email.trim();
  const subject = values.subject.trim();
  const message = values.message.trim();
 
  if (name.length < 2) errors.name = "Please enter your name.";
  if (!email) errors.email = "Email is required.";
  else if (!EMAIL_RE.test(email)) errors.email = "Enter a valid email address.";
  if (subject.length < 3)
    errors.subject = "Subject must be at least 3 characters.";
  if (message.length < 10)
    errors.message = "Message must be at least 10 characters.";
  else if (message.length > maxLength)
    errors.message = `Message cannot exceed ${maxLength} characters.`;
 
  return errors;
}
 
export const ContactForm = forwardRef<HTMLDivElement, ContactFormProps>(
  function ContactForm(
    {
      className,
      title = "Get in touch",
      subtitle = "We usually reply within one business day.",
      submitLabel = "Send message",
      successTitle = "Message sent",
      successMessage = "Thanks for reaching out. We'll get back to you soon.",
      submitErrorMessage = "Your message wasn't sent. Please try again.",
      maxMessageLength = 1000,
      loading = false,
      onSubmit,
      onReset,
      ...props
    },
    ref,
  ) {
    const formId = useId();
    const honeypotRef = useRef<HTMLInputElement>(null);
    const [name, setName] = useState("");
    const [email, setEmail] = useState("");
    const [subject, setSubject] = useState("");
    const [message, setMessage] = useState("");
    const [errors, setErrors] = useState<ContactFormErrors>({});
    const [submitError, setSubmitError] = useState("");
    const [submitting, setSubmitting] = useState(false);
    const [success, setSuccess] = useState(false);
 
    const busy = loading || submitting;
    const messageLimit = Math.max(10, Math.floor(maxMessageLength));
 
    const clearError = useCallback((key: keyof ContactFormValues) => {
      setSubmitError("");
      setErrors((prev) => ({ ...prev, [key]: undefined }));
    }, []);
 
    const handleSubmit = useCallback(
      async (event: FormEvent<HTMLFormElement>) => {
        event.preventDefault();
        if (busy || success) return;
 
        if (honeypotRef.current?.value.trim()) {
          setSuccess(true);
          return;
        }
 
        const values: ContactFormValues = { name, email, subject, message };
        const nextErrors = validateContact(values, messageLimit);
        setErrors(nextErrors);
        if (Object.keys(nextErrors).length > 0) return;
 
        setSubmitting(true);
        setSubmitError("");
        try {
          await onSubmit?.({
            name: name.trim(),
            email: email.trim(),
            subject: subject.trim(),
            message: message.trim(),
          });
          setSuccess(true);
        } catch {
          setSubmitError(submitErrorMessage);
        } finally {
          setSubmitting(false);
        }
      },
      [
        busy,
        email,
        message,
        messageLimit,
        name,
        onSubmit,
        subject,
        submitErrorMessage,
        success,
      ],
    );
 
    const handleReset = useCallback(
      (event: FormEvent<HTMLFormElement>) => {
        onReset?.(event);
        if (event.defaultPrevented) return;
        setName("");
        setEmail("");
        setSubject("");
        setMessage("");
        setErrors({});
        setSubmitError("");
      },
      [onReset],
    );
 
    if (success) {
      return (
        <div
          ref={ref}
          data-slot="contact-form"
          data-success
          role="status"
          aria-live="polite"
          className={cn(
            "w-full max-w-md rounded-3xl bg-white p-6 font-sans md:p-8",
            className,
          )}
        >
          <h2 className="font-sans text-2xl font-semibold tracking-tight text-neutral-950">
            {successTitle}
          </h2>
          <p className="mt-3 text-sm leading-6 text-neutral-500">
            {successMessage}
          </p>
        </div>
      );
    }
 
    return (
      <div ref={ref} className={cn("w-full max-w-md", className)}>
        <form
          data-slot="contact-form"
          aria-busy={busy}
          noValidate
          onSubmit={handleSubmit}
          onReset={handleReset}
          className="rounded-3xl bg-white p-6 font-sans md:p-8"
          {...props}
        >
          <input
            ref={honeypotRef}
            type="text"
            name="company"
            tabIndex={-1}
            autoComplete="off"
            aria-hidden
            className="sr-only"
          />
 
          <div className="mb-7">
            <h2 className="font-sans text-2xl font-semibold tracking-tight text-neutral-950">
              {title}
            </h2>
            <p className="mt-3 max-w-sm text-sm leading-6 text-neutral-500">
              {subtitle}
            </p>
          </div>
 
          <div className="space-y-4">
            <div className="grid gap-4 md:grid-cols-2">
              <div>
                <label
                  htmlFor={`${formId}-name`}
                  className="mb-1.5 block text-sm font-medium text-neutral-900"
                >
                  Name
                </label>
                <input
                  id={`${formId}-name`}
                  name="name"
                  type="text"
                  autoComplete="name"
                  disabled={busy}
                  value={name}
                  aria-invalid={Boolean(errors.name)}
                  aria-describedby={
                    errors.name ? `${formId}-name-error` : undefined
                  }
                  onChange={(event) => {
                    setName(event.target.value);
                    clearError("name");
                  }}
                  className={cn(
                    "h-11 w-full rounded-md border bg-white px-3.5 text-sm ring-0 transition-colors outline-none focus:ring-0 disabled:bg-neutral-50",
                    errors.name
                      ? "border-rose-300"
                      : "border-neutral-200 focus:border-neutral-900",
                  )}
                  placeholder="Your name"
                />
                {errors.name ? (
                  <p
                    id={`${formId}-name-error`}
                    role="alert"
                    className="mt-1.5 text-xs text-rose-600"
                  >
                    {errors.name}
                  </p>
                ) : null}
              </div>
 
              <div>
                <label
                  htmlFor={`${formId}-email`}
                  className="mb-1.5 block text-sm font-medium text-neutral-900"
                >
                  Email
                </label>
                <input
                  id={`${formId}-email`}
                  name="email"
                  type="email"
                  autoComplete="email"
                  disabled={busy}
                  value={email}
                  aria-invalid={Boolean(errors.email)}
                  aria-describedby={
                    errors.email ? `${formId}-email-error` : undefined
                  }
                  onChange={(event) => {
                    setEmail(event.target.value);
                    clearError("email");
                  }}
                  className={cn(
                    "h-11 w-full rounded-md border bg-white px-3.5 text-sm ring-0 transition-colors outline-none focus:ring-0 disabled:bg-neutral-50",
                    errors.email
                      ? "border-rose-300"
                      : "border-neutral-200 focus:border-neutral-900",
                  )}
                  placeholder="you@email.com"
                />
                {errors.email ? (
                  <p
                    id={`${formId}-email-error`}
                    role="alert"
                    className="mt-1.5 text-xs text-rose-600"
                  >
                    {errors.email}
                  </p>
                ) : null}
              </div>
            </div>
 
            <div>
              <label
                htmlFor={`${formId}-subject`}
                className="mb-1.5 block text-sm font-medium text-neutral-900"
              >
                Subject
              </label>
              <input
                id={`${formId}-subject`}
                name="subject"
                type="text"
                disabled={busy}
                value={subject}
                aria-invalid={Boolean(errors.subject)}
                aria-describedby={
                  errors.subject ? `${formId}-subject-error` : undefined
                }
                onChange={(event) => {
                  setSubject(event.target.value);
                  clearError("subject");
                }}
                className={cn(
                  "h-11 w-full rounded-md border bg-white px-3.5 text-sm ring-0 transition-colors outline-none focus:ring-0 disabled:bg-neutral-50",
                  errors.subject
                    ? "border-rose-300"
                    : "border-neutral-200 focus:border-neutral-900",
                )}
                placeholder="How can we help?"
              />
              {errors.subject ? (
                <p
                  id={`${formId}-subject-error`}
                  role="alert"
                  className="mt-1.5 text-xs text-rose-600"
                >
                  {errors.subject}
                </p>
              ) : null}
            </div>
 
            <div>
              <div className="mb-1.5 flex items-baseline justify-between gap-2">
                <label
                  htmlFor={`${formId}-message`}
                  className="text-sm font-medium text-neutral-900"
                >
                  Message
                </label>
                <span className="text-xs text-neutral-400 tabular-nums">
                  {message.length}/{messageLimit}
                </span>
              </div>
              <textarea
                id={`${formId}-message`}
                name="message"
                rows={4}
                disabled={busy}
                value={message}
                maxLength={messageLimit}
                aria-invalid={Boolean(errors.message)}
                aria-describedby={
                  errors.message
                    ? `${formId}-message-error`
                    : `${formId}-message-count`
                }
                onChange={(event) => {
                  setMessage(event.target.value);
                  clearError("message");
                }}
                className={cn(
                  "min-h-28 w-full resize-y rounded-md border bg-white px-3.5 py-2.5 text-sm leading-relaxed ring-0 transition-colors outline-none focus:ring-0 disabled:bg-neutral-50",
                  errors.message
                    ? "border-rose-300"
                    : "border-neutral-200 focus:border-neutral-900",
                )}
                placeholder="Tell us more about your project…"
              />
              <span id={`${formId}-message-count`} className="sr-only">
                {message.length} of {messageLimit} characters used
              </span>
              {errors.message ? (
                <p
                  id={`${formId}-message-error`}
                  role="alert"
                  className="mt-1.5 text-xs text-rose-600"
                >
                  {errors.message}
                </p>
              ) : null}
            </div>
          </div>
 
          {submitError ? (
            <div
              role="alert"
              className="mt-5 flex items-start gap-2.5 border-l-2 border-rose-500 bg-rose-50 px-3 py-2.5 text-sm text-rose-700"
            >
              <AlertCircle size={16} className="mt-0.5 shrink-0" aria-hidden />
              <span>{submitError}</span>
            </div>
          ) : null}
 
          <button
            type="submit"
            disabled={busy}
            className="mt-6 flex h-11 w-full cursor-pointer items-center justify-center gap-2 rounded-md bg-neutral-950 px-4 text-sm font-semibold text-white transition-colors hover:bg-neutral-800 focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-neutral-900 disabled:cursor-not-allowed disabled:opacity-60"
          >
            {busy ? (
              <Loader2 size={16} className="animate-spin" aria-hidden />
            ) : null}
            {busy ? "Sending…" : submitLabel}
            {!busy ? <ChevronRight size={15} aria-hidden /> : null}
          </button>
        </form>
      </div>
    );
  },
);
 
ContactForm.displayName = "ContactForm";