/**
 * javascript/templates.js
 *
 * Templates panel: reusable container configs saved as XML (Unraid
 * Docker-template-compatible schema — see ajax/templates.php's header
 * comment for why). "Use template" hands off to containers.js's Create
 * Container modal, pre-filled; templates are themselves created from
 * that same modal's "Save as template" checkbox, not from here.
 */
(function () {
  'use strict';
  const P = window.Podman;
  let allTemplates = [];

  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>';
  }

  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 render() {
    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, or import an XML template.</div>';
  }

  function load() {
    const container = P.el('podman-panel-templates');
    if (!P.el('templates-grid')) {
      container.innerHTML = '' +
        '<div class="podman-card">' +
        '<div class="podman-toolbar">' +
        '<strong style="flex:1;">Reusable container configs</strong>' +
        '<button class="podman-btn podman-btn-ghost" id="templates-import-btn">&#11014; Import Template</button>' +
        '</div>' +
        '<div class="podman-template-grid" id="templates-grid"></div>' +
        '</div>';
      P.el('templates-import-btn').addEventListener('click', openImportModal);
      P.el('templates-grid').addEventListener('click', handleCardClick);
    }
    return P.get('templates', 'list').then(function (data) {
      allTemplates = data;
      render();
    }).catch(function (err) {
      P.el('templates-grid').innerHTML = '<div class="podman-error">' + P.escapeHtml(err.message) + '</div>';
    });
  }

  function handleCardClick(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;
        alert('Could not load template: ' + err.message);
      });
      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;
        alert('Export failed: ' + err.message);
      });
      return;
    }

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

  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 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);
      });
    }

    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); }
    });
  }

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