// Frontend plugin registry.
// Plugin modules call window.Naut.registerPlugin({...}) after they are imported.

const registry = {
  plugins: [],
  views: [],
  sidebarSections: [],
  detailTabs: [],
  detailPanels: [],
};

let sharedContext = {};

function normalizeList(value) {
  return Array.isArray(value) ? value : [];
}

function registerPlugin(plugin) {
  if (!plugin || !plugin.id || registry.plugins.some((p) => p.id === plugin.id)) return;
  registry.plugins.push(plugin);
  for (const view of normalizeList(plugin.views)) registry.views.push({ plugin, ...view });
  for (const section of normalizeList(plugin.sidebarSections)) registry.sidebarSections.push({ plugin, ...section });
  for (const tab of normalizeList(plugin.detailTabs)) registry.detailTabs.push({ plugin, ...tab });
  for (const panel of normalizeList(plugin.detailPanels)) registry.detailPanels.push({ plugin, ...panel });
}

window.Naut = {
  ...(window.Naut || {}),
  registerPlugin,
  plugins: registry,
  context: () => sharedContext,
};

export async function loadPlugins(api, context) {
  sharedContext = context || {};
  let manifest;
  try { manifest = await api.plugins(); } catch { manifest = { modules: [] }; }
  for (const modulePath of manifest.modules || []) {
    try { await import(modulePath); }
    catch (e) { console.error(`Failed to load plugin ${modulePath}`, e); }
  }
  return registry.plugins;
}

export function pluginViews() {
  return registry.views.filter((v) => v.id && v.label && typeof v.render === 'function');
}

export function getPluginView(id) {
  return pluginViews().find((v) => v.id === id);
}

export function renderPluginView(id, host, context) {
  const view = getPluginView(id);
  if (!view) return false;
  view.render(host, context);
  return true;
}

export function renderPluginSidebarSections(context) {
  return registry.sidebarSections
    .filter((s) => s.id && s.title && typeof s.render === 'function')
    .map((s) => `<div class="side-group plugin-side" data-plugin-sidebar="${s.plugin.id}:${s.id}">
      <div class="side-head">${context.f.esc(s.title)}</div>${s.render(context) || ''}
    </div>`)
    .join('');
}

export function mountPluginSidebarSections(root, context) {
  for (const section of registry.sidebarSections) {
    const el = root.querySelector(`[data-plugin-sidebar="${CSS.escape(`${section.plugin.id}:${section.id}`)}"]`);
    if (el && typeof section.onMount === 'function') section.onMount(el, context);
  }
}

export function pluginDetailTabs() {
  return registry.detailTabs.filter((t) => t.id && t.label && typeof t.render === 'function');
}

export async function renderPluginDetailTab(id, host, context) {
  const tab = pluginDetailTabs().find((t) => t.id === id);
  if (!tab) return false;
  await tab.render(host, context);
  return true;
}

export function renderPluginDetailPanels(torrent, context) {
  return registry.detailPanels
    .filter((p) => p.title && typeof p.render === 'function')
    .map((p) => {
      try {
        return `<div class="section-h">${context.f.esc(p.title)}</div>${p.render(torrent, context) || ''}`;
      } catch (e) {
        console.error(`Failed to render plugin panel ${p.plugin.id}:${p.id || p.title}`, e);
        return '';
      }
    })
    .join('');
}