// ============================================
// MVA Global Fret — Form Handler
// HubSpot Portal ID : 148163754
// HubSpot Form GUID : 1d9b75c9-8b60-4966-aa18-4bf503452e9a
// ============================================

const HUBSPOT_PORTAL_ID = '148163754';
const HUBSPOT_FORM_GUID = '1d9b75c9-8b60-4966-aa18-4bf503452e9a';
// Create a free account at formspree.io and replace this ID to enable email backup
const FORMSPREE_ID = 'mojrvokp';

document.addEventListener('DOMContentLoaded', () => {
  const form = document.getElementById('contactForm');
  if (form) setupContactForm(form);
});

function generateRefNumber() {
  const year = new Date().getFullYear();
  const rand = Math.floor(1000 + Math.random() * 9000); // 4 digits
  return `MVA-${year}-${rand}`;
}

function setupContactForm(form) {
  form.addEventListener('submit', async (e) => {
    e.preventDefault();
    if (!validateForm(form)) return;

    setLoading(true);

    const refNumber = generateRefNumber();

    const data = {
      firstname: form.firstname.value.trim(),
      lastname: form.lastname.value.trim(),
      phone: form.phone.value.trim(),
      email: form.email.value.trim(),
      address: form.address.value.trim(),
      reference_client: refNumber,
    };

    const results = await Promise.allSettled([
      submitToHubSpot(data),
      submitToFormspree(data),
    ]);

    const hubspotOk = results[0].status === 'fulfilled';
    const formspreeOk = results[1].status === 'fulfilled';

    setLoading(false);

    if (hubspotOk || formspreeOk) {
      showSuccess(refNumber);
    } else {
      showError();
    }
  });
}

async function submitToHubSpot(data) {
  const payload = {
    fields: [
      { name: 'firstname', value: data.firstname },
      { name: 'lastname', value: data.lastname },
      { name: 'phone', value: data.phone },
      { name: 'email', value: data.email },
      { name: 'address', value: data.address },
      { name: 'reference_client', value: data.reference_client },
    ],
    context: {
      pageUri: window.location.href,
      pageName: document.title,
    },
  };

  const res = await fetch(
    `https://api.hsforms.com/submissions/v3/integration/submit/${HUBSPOT_PORTAL_ID}/${HUBSPOT_FORM_GUID}`,
    {
      method: 'POST',
      headers: { 'Content-Type': 'application/json' },
      body: JSON.stringify(payload),
    }
  );

  if (!res.ok) throw new Error(`HubSpot error: ${res.status}`);
  return res.json();
}

async function submitToFormspree(data) {
  if (FORMSPREE_ID === 'YOUR_FORMSPREE_ID') return;

  const res = await fetch(`https://formspree.io/f/${FORMSPREE_ID}`, {
    method: 'POST',
    headers: { 'Content-Type': 'application/json', Accept: 'application/json' },
    body: JSON.stringify({
      nom: data.lastname,
      prenom: data.firstname,
      telephone: data.phone,
      email: data.email,
      adresse_livraison: data.address,
      reference_client: data.reference_client,
    }),
  });

  if (!res.ok) throw new Error(`Formspree error: ${res.status}`);
  return res.json();
}

function validateForm(form) {
  let valid = true;
  const lang = localStorage.getItem('mva-lang') || 'fr';
  const t = translations?.[lang]?.contact || {};

  const requiredMsg = t.required || 'Ce champ est obligatoire';
  const invalidEmail = t.invalidEmail || 'Adresse email invalide';
  const invalidPhone = t.invalidPhone || 'Numéro de téléphone invalide';

  const fields = ['firstname', 'lastname', 'phone', 'email', 'address'];
  fields.forEach(name => clearError(name));
  clearError('cgv');

  fields.forEach(name => {
    const el = form[name];
    if (!el.value.trim()) {
      showFieldError(name, requiredMsg);
      valid = false;
    }
  });

  const cgvBox = form['cgv'];
  if (cgvBox && !cgvBox.checked) {
    showFieldError('cgv', t.cgvRequired || 'Vous devez accepter les Conditions Générales de Vente.');
    valid = false;
  }

  if (form.email.value.trim() && !isValidEmail(form.email.value.trim())) {
    showFieldError('email', invalidEmail);
    valid = false;
  }

  if (form.phone.value.trim() && !isValidPhone(form.phone.value.trim())) {
    showFieldError('phone', invalidPhone);
    valid = false;
  }

  return valid;
}

function isValidEmail(email) {
  return /^[^\s@]+@[^\s@]+\.[^\s@]+$/.test(email);
}

function isValidPhone(phone) {
  return /^[+\d][\d\s\-().]{6,20}$/.test(phone);
}

function showFieldError(name, msg) {
  const el = document.getElementById(`error-${name}`);
  const input = document.getElementById(name) || document.querySelector(`[name="${name}"]`);
  if (el) el.textContent = msg;
  if (input) input.classList.add('error');
}

function clearError(name) {
  const el = document.getElementById(`error-${name}`);
  const input = document.getElementById(name) || document.querySelector(`[name="${name}"]`);
  if (el) el.textContent = '';
  if (input) input.classList.remove('error');
}

function setLoading(isLoading) {
  const btn = document.getElementById('submitBtn');
  const txt = document.getElementById('submitText');
  const form = document.getElementById('contactForm');
  const lang = localStorage.getItem('mva-lang') || 'fr';
  const t = translations?.[lang]?.contact || {};

  if (!btn) return;
  btn.disabled = isLoading;
  if (txt) {
    txt.textContent = isLoading
      ? (t.submitLoading || 'Envoi en cours...')
      : (t.submitBtn || "S'inscrire");
  }
  form?.classList.toggle('form-loading', isLoading);
}

function showSuccess(refNumber) {
  const successEl = document.getElementById('formSuccess');
  const form = document.getElementById('contactForm');
  const refDisplay = document.getElementById('refNumberDisplay');
  if (refDisplay && refNumber) refDisplay.textContent = refNumber;
  if (successEl) {
    successEl.classList.add('show');
    successEl.scrollIntoView({ behavior: 'smooth', block: 'center' });
  }
  if (form) form.style.display = 'none';
}

function showError() {
  const errEl = document.getElementById('formErrorGlobal');
  const lang = localStorage.getItem('mva-lang') || 'fr';
  const t = translations?.[lang]?.contact || {};
  if (errEl) {
    errEl.style.display = 'block';
    errEl.textContent = t.errorMsg || 'Une erreur est survenue. Veuillez réessayer ou nous contacter directement.';
  }
}