criação de novas patterns de composição nos projetos

assets/js/creations/file.js

@@ -553,20 +553,17 @@ export async function parseMmpContent(xmlString) {
         name: trackName,
       }));
 
-      if (playlistClips.length === 0) return null;
+      // ❌ remove esta linha:
+      // if (playlistClips.length === 0) return null;
 
+      // ✅ mantém mesmo vazia
       return {
         id: `bassline_${Date.now()}_${Math.random().toString(36).slice(2)}`,
         name: trackName,
         type: "bassline",
-        playlist_clips: playlistClips,
-
-        // 🔥 importante: qual “coluna/pattern” este BBTrack representa
+        playlist_clips: playlistClips, // pode ser []
         patternIndex: idx,
-
-        // 🔥 importante: de onde vêm os instrumentos
         instrumentSourceId: rackId,
-
         volume: 1,
         pan: 0,
         patterns: [],
@@ -575,6 +572,7 @@ export async function parseMmpContent(xmlString) {
     })
     .filter(Boolean);
 
+
   // -------------------------------------------------------------
   // 4. COMBINAÇÃO E FINALIZAÇÃO
   // -------------------------------------------------------------
@@ -744,27 +742,60 @@ export function syncPatternStateToServer() {
   const currentXml = generateXmlFromState();
   sendAction({ type: "SYNC_PATTERN_STATE", xml: currentXml });
   saveStateToSession();
+
+
+function ensureBbTrackCount(xmlDoc, neededCount) {
+  const songTc = xmlDoc.querySelector("song > trackcontainer");
+  if (!songTc) return;
+
+  let bbTracks = Array.from(songTc.querySelectorAll(':scope > track[type="1"]'));
+  if (bbTracks.length === 0) return;
+
+  const template = bbTracks[bbTracks.length - 1];
+
+  while (bbTracks.length < neededCount) {
+    const clone = template.cloneNode(true);
+
+    // limpa blocos
+    Array.from(clone.querySelectorAll(":scope > bbtco")).forEach((n) => n.remove());
+
+    // deixa o container interno “limpo” (opcional)
+    const inner = clone.querySelector('bbtrack > trackcontainer');
+    if (inner) inner.querySelectorAll('track[type="0"]').forEach((n) => n.remove());
+
+    // nome default
+    clone.setAttribute("name", `Beat/Bassline ${bbTracks.length}`);
+
+    songTc.appendChild(clone);
+    bbTracks.push(clone);
+  }
+}
 }
 
 function applyPlaylistClipsToXml(xmlDoc) {
-  const bbTrackNodes = Array.from(xmlDoc.querySelectorAll('track[type="1"]'));
-  if (!bbTrackNodes.length) return;
-
   const basslines = appState.pattern.tracks
     .filter((t) => t.type === "bassline" && Number.isFinite(Number(t.patternIndex)))
     .slice()
     .sort((a, b) => Number(a.patternIndex) - Number(b.patternIndex));
 
+  const maxIdx = Math.max(-1, ...basslines.map((b) => Number(b.patternIndex)));
+  ensureBbTrackCount(xmlDoc, maxIdx + 1);
+
+  const bbTrackNodes = Array.from(xmlDoc.querySelectorAll('track[type="1"]'));
+  if (!bbTrackNodes.length) return;
+
   for (const b of basslines) {
     const idx = Number(b.patternIndex);
     const node = bbTrackNodes[idx];
     if (!node) continue;
 
-    // remove bbtco existentes
+    // ✅ mantém nome/mute sincronizados
+    if (b.name) node.setAttribute("name", b.name);
+    node.setAttribute("muted", b.isMuted ? "1" : "0");
+
     Array.from(node.querySelectorAll(":scope > bbtco")).forEach((n) => n.remove());
 
     const clips = (b.playlist_clips || []).slice().sort((x, y) => (x.pos ?? 0) - (y.pos ?? 0));
-
     for (const c of clips) {
       const el = xmlDoc.createElement("bbtco");
       el.setAttribute("pos", String(Math.max(0, Math.floor(c.pos ?? 0))));
@@ -774,6 +805,7 @@ function applyPlaylistClipsToXml(xmlDoc) {
   }
 }
 
+
 function createTrackXml(track) {
   if (!track.patterns || track.patterns.length === 0) return "";