import { useState } from 'react';

type ContactFormStatus = 'idle' | 'submitting' | 'success' | 'error';

type ContactApiResponse = {
  ok?: boolean;
  error?: string;
};

const DEFAULT_ERROR_MESSAGE = 'Unable to send your message right now. Please try again or email us directly.';

function getValue(formData: FormData, key: string) {
  return String(formData.get(key) || '').trim();
}

export function useContactForm() {
  const [status, setStatus] = useState<ContactFormStatus>('idle');
  const [errorMessage, setErrorMessage] = useState('');

  const resetFeedback = () => {
    if (status === 'idle') {
      return;
    }

    setStatus('idle');
    setErrorMessage('');
  };

  const submitContactForm = async (event: React.FormEvent<HTMLFormElement>) => {
    event.preventDefault();

    if (status === 'submitting') {
      return;
    }

    const form = event.currentTarget;
    const formData = new FormData(form);
    const payload = {
      name: getValue(formData, 'name'),
      email: getValue(formData, 'email'),
      phone: getValue(formData, 'phone'),
      company: getValue(formData, 'company'),
      message: getValue(formData, 'message'),
      website: getValue(formData, 'website'),
    };

    setStatus('submitting');
    setErrorMessage('');

    try {
      const response = await fetch('/api/contact', {
        method: 'POST',
        headers: {
          'Content-Type': 'application/json',
        },
        body: JSON.stringify(payload),
      });
      const data = (await response.json().catch(() => null)) as ContactApiResponse | null;

      if (!response.ok || !data?.ok) {
        throw new Error(data?.error || DEFAULT_ERROR_MESSAGE);
      }

      form.reset();
      setStatus('success');
    } catch (error) {
      setStatus('error');
      setErrorMessage(error instanceof Error ? error.message : DEFAULT_ERROR_MESSAGE);
    }
  };

  return {
    status,
    errorMessage,
    isSubmitting: status === 'submitting',
    isSubmitted: status === 'success',
    hasError: status === 'error',
    resetFeedback,
    submitContactForm,
  };
}