fix(webtorrent): ensure webseed-only streams are marked healthy

Previously, `probePeers` would mark a stream as unhealthy (healthy: false) if no P2P peers were found, even if a valid webseed was present. This caused the UI to potentially disable playback or show error states for webseed-only content.

This fix ensures that if `peers === 0` but `hasWebSeed` is true, the probe result returns `healthy: true` with reason `"webseed"`.

Added `tests/webtorrent-regression.test.mjs` to verify this behavior and prevent future regressions.

Co-authored-by: PR0M3TH3AN <[email protected]>

tests/webtorrent-regression.test.mjs

@@ -0,0 +1,90 @@
+
+import { test, describe, it, after, before } from "node:test";
+import assert from "node:assert";
+import EventEmitter from "events";
+import { TorrentClient } from "../js/webtorrent.js";
+
+// Mock WebTorrent class
+class MockWebTorrent extends EventEmitter {
+  constructor() {
+    super();
+    this.torrents = [];
+    this.setMaxListeners = () => {};
+  }
+
+  add(magnet, opts, cb) {
+    const torrent = new MockTorrent(magnet, opts);
+    this.torrents.push(torrent);
+
+    setTimeout(() => {
+        if (typeof cb === 'function') cb(torrent);
+        this.emit('torrent', torrent);
+    }, 10);
+
+    return torrent;
+  }
+
+  destroy(cb) {
+      if (typeof cb === 'function') cb();
+  }
+}
+
+class MockTorrent extends EventEmitter {
+  constructor(magnet, opts) {
+    super();
+    this.magnet = magnet;
+    this.opts = opts;
+    this.numPeers = 0;
+    this.files = [];
+  }
+
+  destroy(opts, cb) {
+      if (typeof cb === 'function') cb();
+  }
+}
+
+describe("WebTorrent Regression Tests", () => {
+  before(() => {
+    if (typeof global.window === "undefined") {
+      global.window = {};
+    }
+    if (typeof global.window.location === "undefined") {
+      global.window.location = { hostname: "localhost" };
+    }
+    if (typeof global.navigator === "undefined") {
+      global.navigator = { userAgent: "node" };
+    }
+  });
+
+  it("probePeers should report healthy if webseed is present even with 0 peers", async () => {
+    const client = new TorrentClient({ webTorrentClass: MockWebTorrent });
+    const magnet = "magnet:?xt=urn:btih:0123456789abcdef0123456789abcdef01234567";
+    const webSeedUrl = "http://localhost:8080/video.mp4";
+
+    const result = await client.probePeers(magnet, {
+      timeoutMs: 50, // Short timeout
+      urlList: [webSeedUrl]
+    });
+
+    assert.strictEqual(result.webseedOnly, true, "Should detect webseed only scenario");
+    assert.strictEqual(result.healthy, true, "Should be healthy due to webseed");
+    assert.strictEqual(result.reason, "webseed", "Reason should be 'webseed'");
+  });
+
+  it("probePeers should report unhealthy if no webseed and 0 peers", async () => {
+    const client = new TorrentClient({ webTorrentClass: MockWebTorrent });
+    const magnet = "magnet:?xt=urn:btih:0123456789abcdef0123456789abcdef01234567";
+
+    // Adding tracker to avoid "no-trackers" immediate return
+    const magnetWithTr = magnet + "&tr=wss://tracker.example.com";
+
+    const result = await client.probePeers(magnetWithTr, {
+      timeoutMs: 50,
+      urlList: []
+    });
+
+    assert.strictEqual(result.webseedOnly, false, "Should not be webseed only");
+    assert.strictEqual(result.healthy, false, "Should be unhealthy");
+    assert.strictEqual(result.reason, "timeout", "Reason should be 'timeout'");
+  });
+});