/**
 * javascript/templates.js
 *
 * The "Apps" panel: two sub-views toggled by a segmented control —
 * "Store" (browses/searches Community Applications' own public app feed
 * directly, see ajax/templates.php's ca_feed_search()) and "My Templates"
 * (this plugin's own saved, reusable container configs, XML in the same
 * schema Unraid's own Docker Manager templates use). "Use"/"Install" both
 * hand off to containers.js's Create Container modal, pre-filled;
 * templates are themselves created either from that same modal's "Save as
 * template" checkbox, or by installing a Store app (which saves it as a
 * template too, so it shows up under My Templates afterward).
 */
(function () {
  'use strict';
  const P = window.Podman;
  let allTemplates = [];
  let activeSubview = 'store';
  let storeResults = [];
  let storeSearchTimer = null;

  function iconHtml(t) {
    if (t.icon) {
      return '<img class="podman-template-icon" src="' + P.escapeHtml(t.icon) + '" alt="" loading="lazy" ' +
        'onerror="this.replaceWith(Object.assign(document.createElement(\'div\'),{className:\'podman-template-icon podman-template-icon-fallback\',textContent:\'' +
        P.escapeHtml(t.name.slice(0, 1).toUpperCase()) + '\'}))">';
    }
    return '<div class="podman-template-icon podman-template-icon-fallback">' + P.escapeHtml(t.name.slice(0, 1).toUpperCase()) + '</div>';
  }

  // --- My Templates --------------------------------------------------------

  function cardHtml(t) {
    const overview = t.overview && t.overview.length > 110 ? t.overview.slice(0, 107) + '…' : (t.overview || '');
    return '' +
      '<div class="podman-template-card" data-name="' + P.escapeHtml(t.name) + '">' +
      iconHtml(t) +
      '<div class="podman-template-body">' +
      '<div class="podman-template-name">' + P.escapeHtml(t.name) + '</div>' +
      '<div class="podman-row-sub mono">' + P.escapeHtml(t.image) + '</div>' +
      (overview ? '<div class="podman-template-overview">' + P.escapeHtml(overview) + '</div>' : '') +
      '</div>' +
      '<div class="podman-template-actions">' +
      '<button class="podman-btn podman-btn-primary" data-action="use">Use</button>' +
      '<button class="podman-btn podman-btn-ghost" data-action="export">Export</button>' +
      '<button class="podman-btn podman-btn-ghost podman-btn-danger" data-action="delete">Delete</button>' +
      '</div></div>';
  }

  function renderTemplatesGrid() {
    const grid = P.el('templates-grid');
    grid.innerHTML = allTemplates.length
      ? allTemplates.map(cardHtml).join('')
      : '<div class="podman-empty-note">No templates yet — save one from the "New Container" form, install one from the Store, or import an XML template.</div>';
  }

  function load() {
    return P.get('templates', 'list').then(function (data) {
      allTemplates = data;
      renderTemplatesGrid();
    }).catch(function (err) {
      P.el('templates-grid').innerHTML = '<div class="podman-error">' + P.escapeHtml(err.message) + '</div>';
    });
  }

  function handleTemplatesGridClick(e) {
    const btn = e.target.closest('button[data-action]');
    if (!btn) return;
    const name = btn.closest('.podman-template-card').dataset.name;

    if (btn.dataset.action === 'use') {
      btn.disabled = true;
      P.get('templates', 'get', { name: name }).then(function (config) {
        btn.disabled = false;
        P.openCreateContainerModal(config);
      }).catch(function (err) {
        btn.disabled = false;
        P.toast('Could not load template: ' + err.message, 'error');
      });
      return;
    }

    if (btn.dataset.action === 'export') {
      btn.disabled = true;
      P.get('templates', 'export', { name: name }).then(function (data) {
        btn.disabled = false;
        const blob = new Blob([data.xml], { type: 'application/xml' });
        const url = URL.createObjectURL(blob);
        const a = document.createElement('a');
        a.href = url;
        a.download = name + '.xml';
        a.click();
        URL.revokeObjectURL(url);
      }).catch(function (err) {
        btn.disabled = false;
        P.toast('Export failed: ' + err.message, 'error');
      });
      return;
    }

    if (btn.dataset.action === 'delete') {
      P.confirm('Delete template "' + name + '"? This does not affect any running containers.', { danger: true, confirmLabel: 'Delete' }).then(function (ok) {
        if (!ok) return;
        btn.disabled = true;
        P.post('templates', 'remove', { name: name }).then(load).catch(function (err) {
          btn.disabled = false;
          P.toast('Delete failed: ' + err.message, 'error');
        });
      });
    }
  }

  // --- Store -----------------------------------------------------------------

  function storeCardHtml(a) {
    const overview = a.overview && a.overview.length > 110 ? a.overview.slice(0, 107) + '…' : (a.overview || '');
    return '' +
      '<div class="podman-template-card" data-template-url="' + P.escapeHtml(a.templateUrl) + '">' +
      iconHtml(a) +
      '<div class="podman-template-body">' +
      '<div class="podman-template-name">' + P.escapeHtml(a.name) + '</div>' +
      '<div class="podman-row-sub mono">' + P.escapeHtml(a.image) + '</div>' +
      (overview ? '<div class="podman-template-overview">' + P.escapeHtml(overview) + '</div>' : '') +
      '</div>' +
      '<div class="podman-template-actions">' +
      '<button class="podman-btn podman-btn-primary" data-action="install">Install</button>' +
      '</div></div>';
  }

  let storeQuery = '';
  let storeSort = 'newest';
  let storePage = 1;
  let storeTotalPages = 1;

  function renderStoreGrid() {
    const grid = P.el('store-grid');
    grid.innerHTML = storeResults.length
      ? storeResults.map(storeCardHtml).join('')
      : '<div class="podman-empty-note">No matches.</div>';
  }

  function renderStorePager() {
    P.el('store-pager').style.display = storeTotalPages > 1 ? '' : 'none';
    P.el('store-pager-label').textContent = 'Page ' + storePage + ' of ' + storeTotalPages;
    P.el('store-pager-prev').disabled = storePage <= 1;
    P.el('store-pager-next').disabled = storePage >= storeTotalPages;
  }

  // The sort toggle only means anything while browsing (no search term) —
  // a search is always alphabetical (see ca_feed_search()'s own comment on
  // why "newest"/downloads-based ordering doesn't make sense for a filtered
  // result set), so the toggle is hidden rather than left present but inert.
  function updateSortToggleVisibility() {
    P.el('store-sort-toggle').style.display = storeQuery ? 'none' : '';
  }

  function loadStore() {
    const grid = P.el('store-grid');
    grid.innerHTML = '<div class="podman-empty-note">Loading…</div>';
    updateSortToggleVisibility();
    return P.get('templates', 'apps_search', { q: storeQuery, page: storePage, sort: storeSort }).then(function (data) {
      storeResults = data.results;
      storePage = data.page;
      storeTotalPages = Math.max(1, Math.ceil(data.total / data.pageSize));
      renderStoreGrid();
      renderStorePager();
    }).catch(function (err) {
      grid.innerHTML = '<div class="podman-error">' + P.escapeHtml(err.message) + '</div>';
    });
  }

  function handleStoreGridClick(e) {
    const btn = e.target.closest('button[data-action="install"]');
    if (!btn) return;
    const templateUrl = btn.closest('.podman-template-card').dataset.templateUrl;
    btn.disabled = true;
    btn.textContent = 'Installing…';
    P.post('templates', 'import_url', { url: templateUrl }).then(function (result) {
      return P.get('templates', 'get', { name: result.name });
    }).then(function (config) {
      btn.disabled = false;
      btn.textContent = 'Install';
      P.openCreateContainerModal(config);
      load(); // refreshes "My Templates" in the background — it's now saved there too
    }).catch(function (err) {
      btn.disabled = false;
      btn.textContent = 'Install';
      P.toast('Install failed: ' + err.message, 'error');
    });
  }

  // --- Import Template modal ---------------------------------------------

  /**
   * A modal (not its own tab — tried that, but a modal is enough room for
   * this and keeps the nav from growing another entry for what's really a
   * secondary action off "My Templates").
   */
  function openImportModal() {
    const backdrop = document.createElement('div');
    backdrop.className = 'podman-modal-backdrop';
    backdrop.innerHTML = '' +
      '<div class="podman-modal podman-modal-wide" role="dialog" aria-modal="true">' +
      '<div class="podman-modal-head"><h3>Import Template</h3></div>' +
      '<form class="podman-modal-body">' +
      '<div class="podman-modal-field"><label>Your existing Docker templates</label>' +
      '<input type="text" id="ti-local-search" placeholder="Search by name…">' +
      '<div class="podman-local-template-list" id="ti-local-list"><div class="podman-empty-note">Loading…</div></div>' +
      '</div>' +
      '<div class="podman-modal-field"><label>Or import from a URL</label>' +
      '<div style="display:flex; gap:6px;">' +
      '<input type="url" id="ti-url" placeholder="https://raw.githubusercontent.com/.../template.xml" style="flex:1;">' +
      '<button type="button" class="podman-btn podman-btn-ghost" data-role="fetch-url">Fetch &amp; Import</button>' +
      '</div></div>' +
      '<div class="podman-modal-field"><label>Or paste XML directly</label>' +
      '<textarea id="ti-xml" rows="8" class="mono" placeholder="This plugin\'s own export format, or an Unraid/Community Applications Docker template." style="width:100%; resize:vertical;"></textarea></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">Import pasted XML</button>' +
      '</div></div>';

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

    let localTemplates = [];
    function renderLocalList(filter) {
      const list = backdrop.querySelector('#ti-local-list');
      const visible = filter
        ? localTemplates.filter(function (t) { return t.name.toLowerCase().indexOf(filter) !== -1; })
        : localTemplates;
      if (!visible.length) {
        list.innerHTML = '<div class="podman-empty-note">' + (localTemplates.length ? 'No match.' : 'None found.') + '</div>';
        return;
      }
      list.innerHTML = visible.map(function (t) {
        return '<div class="podman-local-template-item" data-file="' + P.escapeHtml(t.file) + '">' +
          '<span class="podman-local-template-name">' + P.escapeHtml(t.name) + '</span>' +
          '<span class="podman-row-sub mono">' + P.escapeHtml(t.image) + '</span>' +
          '<button type="button" class="podman-btn podman-btn-ghost" data-action="import-local">Import</button>' +
          '</div>';
      }).join('');
    }
    P.get('templates', 'list_local').then(function (data) {
      localTemplates = data;
      renderLocalList('');
    }).catch(function () {
      backdrop.querySelector('#ti-local-list').innerHTML = '<div class="podman-empty-note">Could not read local templates.</div>';
    });
    backdrop.querySelector('#ti-local-search').addEventListener('input', function (e) {
      renderLocalList(e.target.value.trim().toLowerCase());
    });
    backdrop.querySelector('#ti-local-list').addEventListener('click', function (e) {
      const btn = e.target.closest('[data-action="import-local"]');
      if (!btn) return;
      const file = btn.closest('.podman-local-template-item').dataset.file;
      btn.disabled = true;
      P.post('templates', 'import_local', { file: file }).then(function () {
        close();
        return load();
      }).catch(function (err) {
        btn.disabled = false;
        showError(err.message);
      });
    });

    backdrop.querySelector('#ti-xml').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 xml = backdrop.querySelector('#ti-xml').value.trim();
      if (!xml) {
        showError('Paste a template XML first.');
        return;
      }
      const submitBtn = backdrop.querySelector('[data-role="submit"]');
      submitBtn.disabled = true;
      P.post('templates', 'import', { xml: xml }).then(function () {
        close();
        return load();
      }).catch(function (err) {
        submitBtn.disabled = false;
        showError(err.message);
      });
    }

    function submitUrl() {
      const url = backdrop.querySelector('#ti-url').value.trim();
      if (!url) {
        showError('Enter a URL first.');
        return;
      }
      const fetchBtn = backdrop.querySelector('[data-role="fetch-url"]');
      fetchBtn.disabled = true;
      P.post('templates', 'import_url', { url: url }).then(function () {
        close();
        return load();
      }).catch(function (err) {
        fetchBtn.disabled = false;
        showError(err.message);
      });
    }

    backdrop.querySelector('[data-role="cancel"]').addEventListener('click', close);
    backdrop.querySelector('[data-role="submit"]').addEventListener('click', submit);
    backdrop.querySelector('[data-role="fetch-url"]').addEventListener('click', submitUrl);
    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); }
    });
  }

  // --- Shell / sub-view toggle --------------------------------------------

  function switchSubview(view) {
    activeSubview = view;
    document.querySelectorAll('#apps-subview-toggle button').forEach(function (b) {
      b.classList.toggle('active', b.dataset.view === view);
    });
    P.el('apps-store-view').style.display = view === 'store' ? '' : 'none';
    P.el('apps-templates-view').style.display = view === 'templates' ? '' : 'none';
    P.el('apps-store-search').style.display = view === 'store' ? '' : 'none';
    P.el('templates-import-btn').style.display = view === 'templates' ? '' : 'none';
    if (view === 'store') {
      updateSortToggleVisibility();
    } else {
      P.el('store-sort-toggle').style.display = 'none';
    }
  }

  function init() {
    const container = P.el('podman-panel-templates');
    container.innerHTML = '' +
      '<div class="podman-card">' +
      '<div class="podman-toolbar">' +
      '<div class="podman-segmented" id="apps-subview-toggle">' +
      '<button class="active" data-view="store">Store</button>' +
      '<button data-view="templates">My Templates</button>' +
      '</div>' +
      '<input class="podman-search" id="apps-store-search" type="text" placeholder="Search Community Applications…">' +
      '<div class="podman-segmented" id="store-sort-toggle">' +
      '<button class="active" data-sort="newest">Newest</button>' +
      '<button data-sort="alpha">A-Z</button>' +
      '</div>' +
      '<button class="podman-btn podman-btn-ghost" id="templates-import-btn" style="display:none;">&#11014; Import Template</button>' +
      '</div>' +
      '<div id="apps-store-view">' +
      '<div class="podman-template-grid" id="store-grid"></div>' +
      '<div class="podman-pager" id="store-pager" style="display:none;">' +
      '<button type="button" class="podman-btn podman-btn-ghost" id="store-pager-prev">&#8249; Prev</button>' +
      '<span id="store-pager-label"></span>' +
      '<button type="button" class="podman-btn podman-btn-ghost" id="store-pager-next">Next &#8250;</button>' +
      '</div>' +
      '</div>' +
      '<div id="apps-templates-view" style="display:none;"><div class="podman-template-grid" id="templates-grid"></div></div>' +
      '</div>';

    document.querySelectorAll('#apps-subview-toggle button').forEach(function (b) {
      b.addEventListener('click', function () { switchSubview(b.dataset.view); });
    });
    P.el('apps-store-search').addEventListener('input', function (e) {
      storeQuery = e.target.value.trim();
      storePage = 1;
      if (storeSearchTimer) clearTimeout(storeSearchTimer);
      storeSearchTimer = setTimeout(loadStore, 400);
    });
    document.querySelectorAll('#store-sort-toggle button').forEach(function (b) {
      b.addEventListener('click', function () {
        storeSort = b.dataset.sort;
        storePage = 1;
        document.querySelectorAll('#store-sort-toggle button').forEach(function (x) { x.classList.toggle('active', x === b); });
        loadStore();
      });
    });
    P.el('store-pager-prev').addEventListener('click', function () {
      if (storePage <= 1) return;
      storePage -= 1;
      loadStore();
    });
    P.el('store-pager-next').addEventListener('click', function () {
      if (storePage >= storeTotalPages) return;
      storePage += 1;
      loadStore();
    });
    P.el('store-grid').addEventListener('click', handleStoreGridClick);
    P.el('templates-grid').addEventListener('click', handleTemplatesGridClick);
    P.el('templates-import-btn').addEventListener('click', openImportModal);

    loadStore();
    return load();
  }

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