/**
 * javascript/images.js
 *
 * Images panel: table + a "Pull Image" action, backed by ajax/images.php.
 */
(function () {
  'use strict';
  const P = window.Podman;
  let images = [];

  function rowHtml(img) {
    const created = img.createdAt ? P.formatRelativeTime(img.createdAt) : '—';
    return '' +
      '<tr data-id="' + P.escapeHtml(img.id) + '">' +
      '<td>' + P.escapeHtml(img.repository) + '</td>' +
      '<td class="mono">' + P.escapeHtml(img.tag) + '</td>' +
      '<td class="mono podman-row-sub">' + P.escapeHtml(img.shortId) + '</td>' +
      '<td class="tnum">' + P.escapeHtml(img.sizeFormatted) + '</td>' +
      '<td class="tnum">' + created + '</td>' +
      '<td class="tnum">' + img.usedBy + '</td>' +
      '<td class="podman-actions"><div class="podman-actions-row">' +
      '<button class="podman-btn podman-btn-icon" data-action="tag" title="Add tag">&#127991;</button>' +
      '<button class="podman-btn podman-btn-icon podman-btn-danger" data-action="remove"' +
      (img.usedBy > 0 ? ' disabled title="In use by a container"' : ' title="Remove"') + '>&#128465;</button></div></td>' +
      '</tr>';
  }

  function render() {
    const tbody = P.el('images-tbody');
    tbody.innerHTML = images.length
      ? images.map(rowHtml).join('')
      : '<tr><td colspan="7" class="podman-empty-note">No images.</td></tr>';
  }

  function load() {
    const tbody = P.el('images-tbody');
    tbody.innerHTML = P.loadingRow(7);
    return P.get('images', 'list').then(function (data) {
      images = data;
      render();
    }).catch(function (err) {
      tbody.innerHTML = P.errorRow(7, err.message);
    });
  }

  function init() {
    P.el('images-pull-btn').addEventListener('click', function () {
      P.openFormModal({
        title: 'Pull Image',
        submitLabel: 'Pull',
        fields: [
          { name: 'reference', label: 'Image reference', required: true, placeholder: 'docker.io/library/postgres:16' },
        ],
        onSubmit: function (values) {
          return P.post('images', 'pull', { reference: values.reference }).then(load);
        },
      });
    });

    P.el('images-prune-btn').addEventListener('click', function () {
      // Computed client-side from the list already on screen — no extra
      // round trip needed, and it lets the confirm() be specific instead
      // of a generic warning. "Unused" here matches libpod's own
      // definition (zero containers, running or stopped, referencing the
      // image) — the same "Used By" count already shown in the table, not
      // just dangling/untagged images. Found live that this can be far
      // more aggressive than expected: with no containers at all, it
      // removes every image on the host.
      const unused = images.filter(function (img) { return img.usedBy === 0; });
      if (!unused.length) {
        P.toast('No unused images to remove — every image is referenced by at least one container.', 'info');
        return;
      }
      const totalBytes = unused.reduce(function (sum, img) { return sum + img.sizeBytes; }, 0);
      const btn = this;
      P.confirm(
        'Remove ' + unused.length + ' image(s) not used by any container (' + P.formatBytes(totalBytes) + ')? ' +
        'This removes any tagged image with zero containers using it, not just dangling ones.',
        { danger: true, confirmLabel: 'Remove' }
      ).then(function (ok) {
        if (!ok) return;
        btn.disabled = true;
        P.post('images', 'prune').then(function (result) {
          btn.disabled = false;
          P.toast('Removed ' + result.removedCount + ' image(s), reclaimed ' + P.formatBytes(result.reclaimedBytes) + '.', 'success');
          return load();
        }).catch(function (err) {
          btn.disabled = false;
          P.toast('Prune failed: ' + err.message, 'error');
        });
      });
    });

    P.el('images-tbody').addEventListener('click', function (e) {
      const btn = e.target.closest('button[data-action]');
      if (!btn || btn.disabled) return;
      const id = btn.closest('tr').dataset.id;

      if (btn.dataset.action === 'tag') {
        P.openFormModal({
          title: 'Add Tag',
          submitLabel: 'Add tag',
          fields: [
            { name: 'repo', label: 'Repository', required: true, placeholder: 'my-registry.local/my-image' },
            { name: 'tag', label: 'Tag', placeholder: 'latest' },
          ],
          onSubmit: function (values) {
            return P.post('images', 'tag', { id: id, repo: values.repo, tag: values.tag || 'latest' }).then(load);
          },
        });
        return;
      }

      if (btn.dataset.action === 'remove') {
        P.confirm('Remove this image?', { danger: true, confirmLabel: 'Remove' }).then(function (ok) {
          if (!ok) return;
          btn.disabled = true;
          P.post('images', 'remove', { id: id }).then(load).catch(function (err) {
            P.toast('Remove failed: ' + err.message, 'error');
            btn.disabled = false;
          });
        });
      }
    });

    return load();
  }

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