/**
 * javascript/networks.js
 *
 * Networks panel: table + create/remove, backed by ajax/networks.php.
 */
(function () {
  'use strict';
  const P = window.Podman;
  let networks = [];

  function rowHtml(n) {
    const nameCell = n.isDefault
      ? '<strong>' + P.escapeHtml(n.name) + '</strong> <span class="podman-row-sub">(default)</span>'
      : P.escapeHtml(n.name);
    const removeDisabled = n.isDefault || n.containers > 0;
    return '' +
      '<tr data-name="' + P.escapeHtml(n.name) + '">' +
      '<td>' + nameCell + '</td>' +
      '<td><span class="podman-chip podman-chip-neutral">' + P.escapeHtml(n.driver) + '</span></td>' +
      '<td class="mono">' + P.escapeHtml(n.subnet || '&mdash;') + '</td>' +
      '<td class="mono">' + P.escapeHtml(n.gateway || '&mdash;') + '</td>' +
      '<td class="tnum">' + n.containers + '</td>' +
      '<td class="podman-actions"><div class="podman-actions-row"><button class="podman-btn podman-btn-icon" data-action="remove"' +
      (removeDisabled ? ' disabled' : '') + ' title="Remove">&#128465;</button></div></td>' +
      '</tr>';
  }

  function render() {
    const tbody = P.el('networks-tbody');
    tbody.innerHTML = networks.length
      ? networks.map(rowHtml).join('')
      : '<tr><td colspan="6" class="podman-empty-note">No networks.</td></tr>';
  }

  function load() {
    const tbody = P.el('networks-tbody');
    tbody.innerHTML = P.loadingRow(6);
    return P.get('networks', 'list').then(function (data) {
      networks = data;
      render();
    }).catch(function (err) {
      tbody.innerHTML = P.errorRow(6, err.message);
    });
  }

  // Purpose-built modal (not app.js's generic openFormModal, which only
  // supports flat always-visible text fields) — the parent-interface
  // dropdown and gateway field only make sense for "macvlan" and need to
  // show/hide based on the driver choice.
  function openCreateNetworkModal() {
    const backdrop = document.createElement('div');
    backdrop.className = 'podman-modal-backdrop';
    backdrop.innerHTML = '' +
      '<div class="podman-modal" role="dialog" aria-modal="true">' +
      '<div class="podman-modal-head"><h3>New Network</h3></div>' +
      '<form class="podman-modal-body">' +
      '<div class="podman-modal-field"><label>Network name</label>' +
      '<input type="text" id="cn-name" placeholder="my-network"></div>' +
      '<div class="podman-modal-field"><label>Type</label>' +
      '<select id="cn-driver">' +
      '<option value="bridge">Bridge (isolated, NAT — default)</option>' +
      '<option value="macvlan">Macvlan (containers get a real IP on your LAN)</option>' +
      '</select></div>' +
      '<div class="podman-modal-field" id="cn-parent-field" style="display:none;">' +
      '<label>Parent interface</label><select id="cn-parent"></select>' +
      '<div class="hint">Same interface Docker Manager\'s "Custom: br0"-style networks use.</div></div>' +
      '<div class="podman-modal-field"><label id="cn-subnet-label">Subnet (optional)</label>' +
      '<input type="text" class="mono" id="cn-subnet" placeholder="10.89.2.0/24"></div>' +
      '<div class="podman-modal-field" id="cn-gateway-field" style="display:none;">' +
      '<label>Gateway</label><input type="text" class="mono" id="cn-gateway" placeholder="10.1.1.1"></div>' +
      '</form>' +
      '<div class="podman-modal-actions">' +
      '<button type="button" class="podman-btn podman-btn-ghost" data-role="cancel">Cancel</button>' +
      '<button type="button" class="podman-btn podman-btn-primary" data-role="submit">Create</button>' +
      '</div></div>';

    (document.querySelector('.podman-plugin') || document.body).appendChild(backdrop);

    let parentInterfaces = [];
    P.get('networks', 'list_parent_interfaces').then(function (interfaces) {
      parentInterfaces = interfaces;
      const select = backdrop.querySelector('#cn-parent');
      select.innerHTML = interfaces.map(function (i) {
        return '<option value="' + P.escapeHtml(i.interface) + '">' + P.escapeHtml(i.label) + '</option>';
      }).join('');
    }).catch(function () { /* macvlan option just won't have anything to pick if this fails */ });

    backdrop.querySelector('#cn-driver').addEventListener('change', function (e) {
      const isMacvlan = e.target.value === 'macvlan';
      backdrop.querySelector('#cn-parent-field').style.display = isMacvlan ? '' : 'none';
      backdrop.querySelector('#cn-gateway-field').style.display = isMacvlan ? '' : 'none';
      backdrop.querySelector('#cn-subnet-label').textContent = isMacvlan ? 'Subnet' : 'Subnet (optional)';
    });

    backdrop.querySelector('#cn-name').focus();

    function close() { backdrop.remove(); }

    function showError(message) {
      let box = backdrop.querySelector('.podman-modal-error');
      if (!box) {
        box = document.createElement('div');
        box.className = 'podman-modal-error';
        backdrop.querySelector('.podman-modal-body').appendChild(box);
      }
      box.textContent = message;
    }

    function submit() {
      const name = backdrop.querySelector('#cn-name').value.trim();
      if (!name) {
        showError('"Network name" is required.');
        return;
      }
      const driver = backdrop.querySelector('#cn-driver').value;
      const subnet = backdrop.querySelector('#cn-subnet').value.trim();
      const gateway = backdrop.querySelector('#cn-gateway').value.trim();
      const parentInterface = backdrop.querySelector('#cn-parent').value;

      if (driver === 'macvlan') {
        if (!subnet) {
          showError('"Subnet" is required for a macvlan network.');
          return;
        }
        if (!parentInterfaces.length) {
          showError('No host bridge/VLAN interface available to attach to.');
          return;
        }
      }

      const submitBtn = backdrop.querySelector('[data-role="submit"]');
      submitBtn.disabled = true;
      P.post('networks', 'create', {
        name: name,
        driver: driver,
        subnet: subnet || undefined,
        gateway: gateway || undefined,
        parentInterface: driver === 'macvlan' ? parentInterface : undefined,
      }).then(function () {
        close();
        return load();
      }).catch(function (err) {
        submitBtn.disabled = false;
        showError(err.message);
      });
    }

    backdrop.querySelector('[data-role="cancel"]').addEventListener('click', close);
    backdrop.querySelector('[data-role="submit"]').addEventListener('click', submit);
    backdrop.querySelector('form').addEventListener('submit', function (e) { e.preventDefault(); submit(); });
    backdrop.addEventListener('click', function (e) { if (e.target === backdrop) close(); });
    document.addEventListener('keydown', function onKey(e) {
      if (e.key === 'Escape') { close(); document.removeEventListener('keydown', onKey); }
    });
  }

  function init() {
    P.el('networks-create-btn').addEventListener('click', openCreateNetworkModal);

    P.el('networks-tbody').addEventListener('click', function (e) {
      const btn = e.target.closest('button[data-action="remove"]');
      if (!btn || btn.disabled) return;
      const name = btn.closest('tr').dataset.name;
      if (!confirm('Remove network "' + name + '"?')) return;
      btn.disabled = true;
      P.post('networks', 'remove', { name: name }).then(load).catch(function (err) {
        alert('Remove failed: ' + err.message);
        btn.disabled = false;
      });
    });

    return load();
  }

  P.registerPanel('networks', { init: init, refresh: load });
})();