Feat: set_preset key for condition to switch preset based on yt-dlp data

app/library/DownloadQueue.py

@@ -828,6 +828,17 @@ class DownloadQueue(metaclass=Singleton):
                     )
                     return {"status": "ok"}
 
+                if condition.extras.get("set_preset") and (target_preset := condition.extras.get("set_preset")):
+                    if Presets.get_instance().has(target_preset):
+                        log_message: str = f"Switching preset from '{item.preset}' to '{target_preset}' for '{item_title}' as per condition '{condition.name}'."
+                        LOG.info(log_message)
+                        self._notify.emit(Events.LOG_INFO, data={}, title="Preset Switched", message=log_message)
+                        item = item.new_with(preset=target_preset)
+                    else:
+                        LOG.warning(
+                            f"Preset '{target_preset}' specified in condition '{condition.name}' does not exist. Ignoring set_preset."
+                        )
+
                 return await self.add(item=item.new_with(requeued=True, cli=condition.cli), already=already)
 
             _status, _msg = ytdlp_reject(entry=entry, yt_params=yt_conf)

app/schema/conditions.json

@@ -38,18 +38,20 @@
     },
     "examples": [
       {
-        "id": "c1e2d3f4-5678-1234-9abc-def012345678",
-        "name": "Audio Only",
-        "filter": "type=audio",
-        "cli": "--extract-audio",
+        "id": "a2b3c4d5-6789-2345-0bcd-ef1234567890",
+        "name": "Long Videos",
+        "filter": "duration>3600",
         "extras": {
-          "priority": "high"
+          "ignore_download": true
         }
       },
       {
-        "id": "a2b3c4d5-6789-2345-0bcd-ef1234567890",
-        "name": "Long Videos",
-        "filter": "duration>3600"
+        "id": "b3c4d5e6-7890-3456-1cde-f23456789012",
+        "name": "Use Audio Preset for Music",
+        "filter": "categories~='Music'",
+        "extras": {
+          "set_preset": "audio-only"
+        }
       }
     ]
   }

ui/app/components/ConditionForm.vue

@@ -164,6 +164,10 @@
                             <b>YTPTube</b> to ignore the download and directly mark the item as archived. this is useful
                             to skip certain kind of downloads.
                           </li>
+                          <li>The key <code>set_preset</code> with the name of an existing preset will instruct
+                            <b>YTPTube</b> to switch the download to use the specified preset. This is useful
+                            to apply different download settings based on content type or source.
+                          </li>
                         </ul>
                       </div>
                     </div>