Add popular tag strip support to recent videos

js/app.js

@@ -887,6 +887,7 @@ class Application {
     this.currentVideoPointerKey = null;
     this.videoSubscription = this.nostrService.getVideoSubscription() || null;
     this.videoList = null;
+    this.videoListPopularTags = null;
     this.modalViewCountUnsub = null;
     this.modalReactionUnsub = null;
     this.modalReactionPointerKey = null;
@@ -1197,6 +1198,11 @@ class Application {
     }
 
     this.videoList = null;
+    if (this.videoListPopularTags) {
+      this.videoListPopularTags.textContent = "";
+      this.videoListPopularTags.hidden = true;
+    }
+    this.videoListPopularTags = null;
 
     if (this.mediaLoader && typeof this.mediaLoader.disconnect === "function") {
       this.mediaLoader.disconnect();
@@ -2902,6 +2908,11 @@ class Application {
 
     const target = container || document.getElementById("videoList");
     this.videoList = target || null;
+    const tagsRoot = document.getElementById("recentVideoTags");
+    this.videoListPopularTags = tagsRoot || null;
+    if (typeof this.videoListView.setPopularTagsContainer === "function") {
+      this.videoListView.setPopularTagsContainer(this.videoListPopularTags);
+    }
     this.videoListView.mount(this.videoList || null);
     return this.videoList;
   }
@@ -2933,6 +2944,11 @@ class Application {
         : "Refreshing videos…";
 
     this.videoList = isElement(container) ? container : null;
+    const tagsRoot = document.getElementById("recentVideoTags");
+    this.videoListPopularTags = isElement(tagsRoot) ? tagsRoot : null;
+    if (typeof this.videoListView.setPopularTagsContainer === "function") {
+      this.videoListView.setPopularTagsContainer(this.videoListPopularTags);
+    }
 
     if (this.videoList) {
       this.videoList.innerHTML = getSidebarLoadingMarkup(messageContext);
@@ -8831,6 +8847,11 @@ class Application {
     }
 
     this.videoList = null;
+    if (this.videoListPopularTags) {
+      this.videoListPopularTags.textContent = "";
+      this.videoListPopularTags.hidden = true;
+    }
+    this.videoListPopularTags = null;
   }
 
   shareActiveVideo() {

js/subscriptions.js

@@ -1123,6 +1123,9 @@ class SubscriptionsManager {
     };
 
     const listView = new VideoListView(listViewConfig);
+    if (typeof listView.setPopularTagsContainer === "function") {
+      listView.setPopularTagsContainer(null);
+    }
 
     listView.setPlaybackHandler((detail) => {
       if (!detail) {

js/ui/views/VideoListView.js

@@ -1,10 +1,12 @@
 import { VideoCard } from "../components/VideoCard.js";
+import { renderTagPillStrip } from "../components/tagPillList.js";
 import {
   subscribeToVideoViewCount,
   unsubscribeFromVideoViewCount,
 } from "../../viewCounter.js";
 import { normalizeDesignSystemContext } from "../../designSystem.js";
 import { userLogger } from "../../utils/logger.js";
+import { collectVideoTags } from "../../utils/videoTags.js";
 
 const EMPTY_VIDEO_LIST_SIGNATURE = "__EMPTY__";
 
@@ -174,6 +176,8 @@ export class VideoListView {
     this.currentVideos = [];
     this.lastRenderedVideoSignature = null;
     this._lastRenderedVideoListElement = null;
+    this.popularTagsRoot = null;
+    this._popularTagStrip = null;
 
     this.handlers = {
       playback: null,
@@ -256,6 +260,12 @@ export class VideoListView {
     this.currentVideos = [];
     this.lastRenderedVideoSignature = null;
     this._lastRenderedVideoListElement = null;
+    if (this.popularTagsRoot) {
+      this.popularTagsRoot.textContent = "";
+      this.popularTagsRoot.hidden = true;
+    }
+    this.popularTagsRoot = null;
+    this._popularTagStrip = null;
   }
 
   setPlaybackHandler(handler) {
@@ -282,6 +292,91 @@ export class VideoListView {
     this.handlers.moderationOverride = typeof handler === "function" ? handler : null;
   }
 
+  setPopularTagsContainer(container) {
+    if (this.popularTagsRoot && this.popularTagsRoot !== container) {
+      this.popularTagsRoot.textContent = "";
+      this.popularTagsRoot.hidden = true;
+    }
+
+    this.popularTagsRoot = container || null;
+    this._popularTagStrip = null;
+
+    if (this.popularTagsRoot) {
+      this.popularTagsRoot.textContent = "";
+      this.popularTagsRoot.hidden = true;
+    }
+  }
+
+  updatePopularTags(videos) {
+    const root = this.popularTagsRoot;
+    if (!root) {
+      return;
+    }
+
+    if (!Array.isArray(videos) || videos.length === 0) {
+      root.textContent = "";
+      root.hidden = true;
+      this._popularTagStrip = null;
+      return;
+    }
+
+    const counts = new Map();
+    const displayNames = new Map();
+
+    videos.forEach((video) => {
+      const tags = collectVideoTags(video);
+      tags.forEach((tag) => {
+        if (typeof tag !== "string" || !tag) {
+          return;
+        }
+        const lower = tag.toLowerCase();
+        counts.set(lower, (counts.get(lower) || 0) + 1);
+        if (!displayNames.has(lower)) {
+          displayNames.set(lower, tag);
+        }
+      });
+    });
+
+    if (!counts.size) {
+      root.textContent = "";
+      root.hidden = true;
+      this._popularTagStrip = null;
+      return;
+    }
+
+    const tagEntries = Array.from(counts.entries()).map(([lower, count]) => ({
+      count,
+      tag: displayNames.get(lower) || lower,
+    }));
+
+    tagEntries.sort((a, b) => {
+      if (b.count !== a.count) {
+        return b.count - a.count;
+      }
+      const lowerA = a.tag.toLowerCase();
+      const lowerB = b.tag.toLowerCase();
+      if (lowerA === lowerB) {
+        return a.tag.localeCompare(b.tag);
+      }
+      return lowerA.localeCompare(lowerB);
+    });
+
+    const tags = tagEntries.map((entry) => entry.tag);
+    const doc = this.document || root.ownerDocument || null;
+    if (!doc) {
+      root.textContent = "";
+      root.hidden = true;
+      this._popularTagStrip = null;
+      return;
+    }
+
+    const { root: strip } = renderTagPillStrip({ document: doc, tags });
+    root.textContent = "";
+    root.appendChild(strip);
+    root.hidden = false;
+    this._popularTagStrip = strip;
+  }
+
   render(videos, metadata = null) {
     if (!this.container) {
       return [];
@@ -307,6 +402,8 @@ export class VideoListView {
       return canEdit || !isPrivate;
     });
 
+    this.updatePopularTags(displayVideos);
+
     this.syncViewCountSubscriptions(displayVideos);
     this.cleanupThumbnailCache(displayVideos);
     this.cleanupHealthCache(displayVideos);

tests/ui/video-list-view-popular-tags.test.mjs

@@ -0,0 +1,80 @@
+import test from "node:test";
+import assert from "node:assert/strict";
+import { JSDOM } from "jsdom";
+
+import { VideoListView } from "../../js/ui/views/VideoListView.js";
+
+function createViewDom() {
+  const dom = new JSDOM(
+    "<!DOCTYPE html><body><section><div id=\"recentVideoTags\" hidden></div><div id=\"videoList\"></div></section></body>"
+  );
+  const { document } = dom.window;
+  const listRoot = document.getElementById("videoList");
+  const tagsRoot = document.getElementById("recentVideoTags");
+  return { dom, document, listRoot, tagsRoot };
+}
+
+test("VideoListView renders sorted popular tag pills", () => {
+  const { document, listRoot, tagsRoot } = createViewDom();
+  const view = new VideoListView({ document });
+  view.mount(listRoot);
+  view.setPopularTagsContainer(tagsRoot);
+
+  const videos = [
+    {
+      id: "v1",
+      title: "First",
+      pubkey: "pub1",
+      created_at: 3,
+      nip71: { hashtags: ["Nostr", "Video"] },
+    },
+    {
+      id: "v2",
+      title: "Second",
+      pubkey: "pub2",
+      created_at: 2,
+      tags: [
+        ["t", "nostr"],
+        ["t", "Learning"],
+      ],
+    },
+    {
+      id: "v3",
+      title: "Third",
+      pubkey: "pub3",
+      created_at: 1,
+      nip71: { hashtags: ["video"] },
+    },
+  ];
+
+  view.render(videos);
+
+  assert(tagsRoot);
+  assert.equal(tagsRoot.hidden, false);
+  const buttons = tagsRoot.querySelectorAll("button");
+  assert.equal(buttons.length, 3);
+  assert.deepEqual(
+    Array.from(buttons, (button) => button.dataset.tag),
+    ["Nostr", "Video", "Learning"],
+  );
+});
+
+test("VideoListView hides popular tags when no tags are available", () => {
+  const { document, listRoot, tagsRoot } = createViewDom();
+  const view = new VideoListView({ document });
+  view.mount(listRoot);
+  view.setPopularTagsContainer(tagsRoot);
+
+  view.render([
+    {
+      id: "v10",
+      title: "Tagless",
+      pubkey: "pub10",
+      created_at: 10,
+    },
+  ]);
+
+  assert(tagsRoot);
+  assert.equal(tagsRoot.hidden, true);
+  assert.equal(tagsRoot.childElementCount, 0);
+});

views/most-recent-videos.html

@@ -4,6 +4,7 @@
   <h2 class="mb-4 text-xl font-semibold text-text">Most Recent Videos</h2>
 
   <!-- Video List -->
+  <div id="recentVideoTags" class="mb-4" hidden></div>
   <div id="videoList" class="bv-grid-video">
     <div class="sidebar-loading-wrapper" role="status" aria-live="polite">
       <div class="sidebar-loading-indicator">