Add support for fusing/unfusing JellyLMS zones into synchronized

multi-room groups, addressed by MAC (derived from the `lms-{mac}` device id).

src-tauri/src/jellyfin/client.rs

@@ -384,6 +384,82 @@ impl JellyfinClient {
         let sessions = self.get_sessions().await?;
         Ok(sessions.into_iter().find(|s| s.id.as_deref() == Some(session_id)))
     }
+
+    // --- JellyLMS multi-room sync groups -----------------------------------
+    //
+    // The JellyLMS plugin exposes a REST API under `/JellyLms` for grouping LMS
+    // players ("zones") into synchronized multi-room sync groups. Players are
+    // addressed by MAC address; JellyTau maps a Jellyfin session to a MAC by
+    // stripping the `lms-` prefix off the session's device id (see
+    // LmsDeviceDiscoveryService in the jellyLMS repo, which registers each player
+    // with deviceId = "lms-{MacAddress}").
+
+    /// List current LMS sync groups.
+    pub async fn lms_get_sync_groups(&self) -> Result<Vec<LmsSyncGroup>, String> {
+        self.get("/JellyLms/SyncGroups").await
+    }
+
+    /// Fuse LMS zones: create a sync group with `master_mac` as the sync master
+    /// and `slave_macs` joining it. The master keeps playing; slaves follow.
+    pub async fn lms_create_sync_group(
+        &self,
+        master_mac: &str,
+        slave_macs: Vec<String>,
+    ) -> Result<(), String> {
+        let payload = serde_json::json!({
+            "MasterMac": master_mac,
+            "SlaveMacs": slave_macs,
+        });
+        self.post("/JellyLms/SyncGroups", &payload).await
+    }
+
+    /// Remove a single LMS player from whatever sync group it's in.
+    pub async fn lms_unsync_player(&self, mac: &str) -> Result<(), String> {
+        self.delete(&format!("/JellyLms/SyncGroups/Players/{}", mac)).await
+    }
+
+    /// Dissolve an entire LMS sync group, identified by its master's MAC.
+    pub async fn lms_dissolve_sync_group(&self, master_mac: &str) -> Result<(), String> {
+        self.delete(&format!("/JellyLms/SyncGroups/{}", master_mac)).await
+    }
+
+    /// Make a DELETE request to the Jellyfin API (used by the JellyLMS endpoints).
+    async fn delete(&self, endpoint: &str) -> Result<(), String> {
+        let url = format!("{}{}", self.config.server_url, endpoint);
+
+        log::debug!("[JellyfinClient] DELETE {}", endpoint);
+
+        let response = self.http_client
+            .delete(&url)
+            .header("X-Emby-Authorization", self.get_auth_header())
+            .send()
+            .await
+            .map_err(|e| format!("Network request failed: {}", e))?;
+
+        let status = response.status();
+        if !status.is_success() {
+            let error_text = response.text().await.unwrap_or_else(|_| "Unknown error".to_string());
+            return Err(format!("Jellyfin API error {}: {}", status.as_u16(), error_text));
+        }
+        Ok(())
+    }
+}
+
+/// An LMS multi-room sync group, as returned by JellyLMS `/JellyLms/SyncGroups`.
+///
+/// Mirrors the plugin's `SyncGroup` model. The master is the sync source; slaves
+/// follow it in lockstep.
+#[derive(specta::Type, Debug, Clone, Deserialize, serde::Serialize)]
+#[serde(rename_all = "camelCase")]
+pub struct LmsSyncGroup {
+    #[serde(alias = "MasterMac")]
+    pub master_mac: String,
+    #[serde(default, alias = "MasterName")]
+    pub master_name: String,
+    #[serde(default, alias = "SlaveMacs")]
+    pub slave_macs: Vec<String>,
+    #[serde(default, alias = "SlaveNames")]
+    pub slave_names: Vec<String>,
 }
 
 /// Default value for supports_remote_control when missing from API