/**
 * Billing UI — Spec 023 + Spec 043 (conta cliente + activação preview)
 */
const DeskBilling = (() => {
  const API = '/api';
  const PLAN_OPTIONS = [
    { code: 'ligbox-mail-starter', label: 'Mail Starter (10)' },
    { code: 'ligbox-mail-business', label: 'Mail Business (25)' },
    { code: 'ligbox-mail-enterprise', label: 'Mail Enterprise (50)' },
    { code: 'ligbox-mail-custom', label: 'Mail Custom' },
  ];

  function esc(s) {
    return String(s ?? '').replace(/&/g, '&amp;').replace(/</g, '&lt;').replace(/>/g, '&gt;');
  }

  function canActivate() {
    return typeof canManageBilling === 'function' && canManageBilling();
  }

  async function api(path, options = {}) {
    const res = await fetch(`${API}${path}`, {
      ...options,
      headers: { ...authHeaders(), 'Content-Type': 'application/json', ...(options.headers || {}) },
    });
    if (!res.ok) throw new Error((await res.json().catch(() => ({}))).detail || res.statusText);
    return res.json();
  }

  function closeModal() {
    document.querySelector('.billing-modal-backdrop')?.remove();
  }

  function renderMappedBlock(title, obj) {
    const rows = Object.entries(obj || {})
      .filter(([, v]) => v != null && v !== '' && typeof v !== 'object')
      .map(([k, v]) => `<dt>${esc(k)}</dt><dd>${esc(v)}</dd>`)
      .join('');
    return `
      <section class="billing-activation-col">
        <h4>${esc(title)}</h4>
        <dl class="kv kv-compact">${rows || '<dt>—</dt><dd>sem dados</dd>'}</dl>
      </section>`;
  }

  async function openActivationPreview(accountId, domain) {
    const planSel = document.querySelector('[data-billing-plan]');
    const plan = planSel?.value || '';
    const qs = plan ? `?plan_code=${encodeURIComponent(plan)}` : '';
    const preview = await api(`/v1/billing/accounts/${accountId}/activation-preview${qs}`);
    const m = preview.mapped || {};
    const foss = m.foss_client || {};
    const op = m.openpanel || {};
    const odoo = m.odoo_partner || {};
    const meta = op.metadata || {};

    const backdrop = document.createElement('div');
    backdrop.className = 'billing-modal-backdrop';
    backdrop.innerHTML = `
      <div class="billing-modal billing-modal-wide" role="dialog">
        <h3 style="margin-top:0">Activar conta — ${esc(domain)}</h3>
        <p class="ticket-meta">Estado: <strong>${esc(preview.billing_state)}</strong> · Plano: ${esc(preview.plan_code)}</p>
        <div class="billing-activation-grid">
          ${renderMappedBlock('FOSSBilling — cliente', foss)}
          ${renderMappedBlock('OpenPanel — hub', { username: op.username, email: op.email, plan_name: op.plan_name, domain: op.domain, seats: meta.max_seats })}
          ${renderMappedBlock('Odoo — empresa', { name: odoo.name, vat: odoo.vat, email: odoo.email, ref: odoo.ref })}
        </div>
        <p class="ticket-meta" style="margin-top:0.75rem">${esc(preview.notes || '')}</p>
        <div style="display:flex;gap:0.5rem;margin-top:1rem;flex-wrap:wrap">
          <button type="button" class="btn btn-primary btn-sm" data-billing-activate-confirm disabled title="Fase 2–5 Spec 043">Activar conta (em breve)</button>
          <button type="button" class="btn btn-sm" data-billing-close>Fechar</button>
        </div>
      </div>`;
    document.body.appendChild(backdrop);
    backdrop.addEventListener('click', (e) => { if (e.target === backdrop) closeModal(); });
    backdrop.querySelector('[data-billing-close]')?.addEventListener('click', closeModal);
  }

  async function openAccountModal(domain) {
    closeModal();
    const acc = await api(`/v1/billing/accounts/by-domain/${encodeURIComponent(domain)}`);
    const planOptions = PLAN_OPTIONS.map(
      (p) => `<option value="${esc(p.code)}" ${acc.plan_code === p.code ? 'selected' : ''}>${esc(p.label)}</option>`
    ).join('');
    const backdrop = document.createElement('div');
    backdrop.className = 'billing-modal-backdrop';
    backdrop.innerHTML = `
      <div class="billing-modal" role="dialog">
        <h3 style="margin-top:0">Conta do cliente — ${esc(domain)}</h3>
        <dl class="kv">
          <dt>Estado</dt><dd>${esc(acc.billing_state)}</dd>
          <dt>Razão social</dt><dd>${esc(acc.legal_name || acc.trade_name || '—')}</dd>
          <dt>Email cobrança</dt><dd>${esc(acc.email_billing || '—')}</dd>
          <dt>CNPJ/CPF</dt><dd>${esc(acc.tax_id || '—')}</dd>
          <dt>Recorrência</dt><dd>${acc.recurrence_active ? '✅ ativa' : '—'}</dd>
        </dl>
        ${canActivate() ? `
        <label class="ticket-meta" style="display:block;margin-top:0.5rem">Plano comercial
          <select class="input-sm" data-billing-plan style="display:block;margin-top:0.25rem;max-width:100%">${planOptions}</select>
        </label>` : ''}
        <p class="ticket-meta">
          <a href="${esc(acc.links?.fossbilling || '#')}" target="_blank" rel="noreferrer">FOSSBilling 💳</a>
          · <a href="${esc(acc.links?.odoo || '#')}" target="_blank" rel="noreferrer">Odoo</a>
        </p>
        <div style="display:flex;gap:0.5rem;margin-top:1rem;flex-wrap:wrap">
          ${canActivate() && !acc.recurrence_active ? `<button type="button" class="btn btn-primary btn-sm" data-billing-activate="${acc.id}" data-domain="${esc(domain)}">Activar conta</button>` : ''}
          ${canManageVm112Domains?.() ? `<button type="button" class="btn btn-sm" data-billing-ativate="${acc.id}">Activar recorrência</button>` : ''}
          <button type="button" class="btn btn-sm" data-billing-close>Fechar</button>
        </div>
      </div>`;
    document.body.appendChild(backdrop);
    backdrop.addEventListener('click', (e) => { if (e.target === backdrop) closeModal(); });
    backdrop.querySelector('[data-billing-close]')?.addEventListener('click', closeModal);
    backdrop.querySelector('[data-billing-activate]')?.addEventListener('click', async (e) => {
      const btn = e.currentTarget;
      const id = btn.getAttribute('data-billing-activate');
      const dom = btn.getAttribute('data-domain') || domain;
      try {
        await openActivationPreview(id, dom);
      } catch (err) {
        alert(err.message || 'Erro ao carregar preview');
      }
    });
    backdrop.querySelector('[data-billing-ativate]')?.addEventListener('click', async () => {
      await api(`/v1/billing/accounts/${acc.id}`, {
        method: 'PATCH',
        body: JSON.stringify({ recurrence_active: true, billing_state: 'billing_active' }),
      });
      closeModal();
      if (typeof state !== 'undefined' && state.view === 'overview-home' && typeof renderOverviewHome === 'function') {
        await renderOverviewHome();
      }
    });
  }

  return { openAccountModal, openActivationPreview, closeModal };
})();

window.DeskBilling = DeskBilling;