function initApp() {
  console.log('sub-aligator app.js initialized');

  // Ensure every modal starts closed, even if the browser restored a cached state.
  document.querySelectorAll('.modal-overlay').forEach(function (modal) {
    modal.style.display = 'none';
  });

  // Open allocation modal
  document.querySelectorAll('.allocate-btn').forEach(function (btn) {
    btn.addEventListener('click', function () {
      console.log('allocate-btn clicked', btn.dataset);
      openAllocateModal(btn);
    });
  });

  // Open release modal from history table
  document.querySelectorAll('.release-btn').forEach(function (btn) {
    btn.addEventListener('click', function () {
      const id = btn.dataset.id;
      const modal = document.getElementById('release-modal-' + id);
      if (modal) {
        modal.style.display = 'flex';
      }
    });
  });

  // Close modal via Cancel button
  document.querySelectorAll('.cancel-btn').forEach(function (btn) {
    btn.addEventListener('click', function () {
      const modalId = btn.dataset.modal;
      const modal = document.getElementById(modalId);
      if (modal) {
        modal.style.display = 'none';
      }
    });
  });

  // Close modal by clicking on the overlay background
  document.querySelectorAll('.modal-overlay').forEach(function (overlay) {
    overlay.addEventListener('click', function (event) {
      if (event.target === overlay) {
        overlay.style.display = 'none';
      }
    });
  });

  // Prevent clicks inside the modal from closing it
  document.querySelectorAll('.modal').forEach(function (modal) {
    modal.addEventListener('click', function (event) {
      event.stopPropagation();
    });
  });

  // Hide the modal right before its form is submitted.
  document.querySelectorAll('.modal form').forEach(function (form) {
    form.addEventListener('submit', function () {
      const overlay = form.closest('.modal-overlay');
      if (overlay) {
        overlay.style.display = 'none';
      }
    });
  });
}

async function openAllocateModal(btn) {
  const slug = btn.dataset.slug;
  const name = btn.dataset.name;
  const select = document.getElementById('prefix-' + slug);
  let prefixLength = '';

  if (select && select.value) {
    prefixLength = select.value;
  } else if (select && select.options.length > 0) {
    prefixLength = select.options[0].value;
  } else {
    prefixLength = '24';
  }

  console.log('openAllocateModal', { slug: slug, name: name, prefixLength: prefixLength });

  document.getElementById('modal-pool-slug').value = slug;
  document.getElementById('modal-prefix-length').value = prefixLength;
  document.getElementById('modal-pool-name').textContent = name;
  document.getElementById('modal-prefix-display').textContent = '/' + prefixLength;

  try {
    const resp = await fetch('/partials/pools/' + slug + '/preview?prefix_length=' + prefixLength);
    const html = await resp.text();
    const parser = new DOMParser();
    const doc = parser.parseFromString(html, 'text/html');

    const cidr = doc.getElementById('preview-cidr')?.textContent || '–';
    const addressCount = doc.getElementById('preview-address-count')?.textContent || '–';
    const usableHosts = doc.getElementById('preview-usable-hosts')?.textContent || '–';
    const warning = doc.getElementById('preview-warning')?.textContent || '';

    document.getElementById('modal-cidr').textContent = cidr;
    document.getElementById('modal-address-count').textContent = addressCount;
    document.getElementById('modal-usable-hosts').textContent = usableHosts;
    document.getElementById('modal-warning').textContent = warning;
  } catch (e) {
    console.error('preview fetch failed', e);
    document.getElementById('modal-warning').textContent = 'Could not load preview.';
  }

  document.getElementById('allocate-modal').style.display = 'flex';
}

if (document.readyState === 'loading') {
  document.addEventListener('DOMContentLoaded', initApp);
} else {
  initApp();
}