downloader+bridge: supporto download da URL diretti (YouTube search flow)

Aggiunge download_urls() in core/downloader.py che scarica direttamente da
URL YouTube gia noti (bypassa lo step di ricerca). Usa gli stessi flag di
download_playlist (mp3, embed thumbnail/metadata, output template, cookies,
ffmpeg location) e il parsing progress via stdout.

In api/bridge.py aggiunge start_urls_download() e _urls_worker() speculari a
start_tracks_download/_tracks_worker. Consumati dal tab "YouTube Search"
dopo che l'utente ha selezionato i risultati.

api/bridge.py

@@ -544,6 +544,40 @@ class Api:
         self._download_thread.start()
         return {"ok": True}
 
+    def start_urls_download(self, payload: dict) -> dict:
+        """Analogo a start_tracks_download ma accetta URL YouTube gia noti
+        (bypass search). Usato dal flow del tab 'YouTube Search'."""
+        if self._any_job_running():
+            return {"ok": False, "error": "Un download gia in corso"}
+
+        urls = payload.get("urls") or []
+        titles = payload.get("titles") or []
+        output_dir = (payload.get("output_dir") or "").strip()
+        subfolder = (payload.get("subfolder") or "").strip()
+        if not urls:
+            return {"ok": False, "error": "Nessuna URL fornita"}
+        if len(urls) != len(titles):
+            return {"ok": False, "error": "urls e titles devono avere stessa lunghezza"}
+        if not output_dir:
+            return {"ok": False, "error": "Cartella output non impostata"}
+
+        if subfolder:
+            safe = subfolder.replace("/", "_").replace("\\", "_").strip()
+            if safe:
+                output_dir = os.path.join(output_dir, safe)
+
+        gate = self._gate("audio")
+        if gate:
+            return gate
+
+        self._download_thread = threading.Thread(
+            target=self._urls_worker,
+            args=(list(urls), list(titles), output_dir),
+            daemon=True,
+        )
+        self._download_thread.start()
+        return {"ok": True}
+
     def stop_download(self) -> dict:
         request_download_stop()
         self._log("download", "[INFO] Interruzione richiesta...")
@@ -601,6 +635,53 @@ class Api:
         download_playlist(tracks, output_dir, bitrate, cookies_path, progress_cb)
         self._emit("download:done", {"ok": True})
 
+    def _urls_worker(self, urls: list, titles: list, output_dir: str) -> None:
+        from core.downloader import download_urls
+        reset_download_stop()
+        cfg = load_config()
+        bitrate = cfg.get("bitrate", "320K")
+        cookies_path = cfg.get("cookies_path", "")
+        view = "download"
+
+        self._log(view, f"[INFO] URL list: {len(urls)} da scaricare da YouTube")
+        self._log(view, f"[INFO] Destinazione: {output_dir}")
+
+        _last = [0.0]
+        _THROTTLE = 0.10
+
+        def progress_cb(idx, total, title, status, pct):
+            if status == "downloading":
+                now = time.monotonic()
+                if now - _last[0] < _THROTTLE:
+                    return
+                _last[0] = now
+
+            payload_evt = {
+                "idx": idx, "total": total, "track": title,
+                "status": status, "pct": pct,
+                "url_idx": 0, "url_total": 1,
+            }
+            if status == "skipped":
+                self._log(view, f"[SKIP] {title} (gia scaricato)")
+                payload_evt["overall"] = min((idx + 1) / total, 1.0) if total else 1
+            elif status == "downloading":
+                payload_evt["overall"] = min((idx / total) + (pct / 100 / total), 1.0) if total else 0
+            elif status == "done":
+                self._log(view, f"[OK] {title}")
+                payload_evt["overall"] = min((idx + 1) / total, 1.0) if total else 1
+            elif status == "stopped":
+                self._log(view, "[INFO] Download interrotto.")
+            elif status == "completed":
+                payload_evt["overall"] = 1.0
+                self._log(view, "[INFO] Download completato!")
+            elif status.startswith("error"):
+                self._log(view, f"[ERRORE] {title}: {status}")
+
+            self._emit("download:progress", payload_evt)
+
+        download_urls(urls, titles, output_dir, bitrate, cookies_path, progress_cb)
+        self._emit("download:done", {"ok": True})
+
     def _download_worker(self, urls: list, output_dir: str) -> None:
         reset_download_stop()
         cfg = load_config()

core/downloader.py

@@ -399,6 +399,125 @@ def download_direct_url(
         progress_callback(total, total, "", "completed", 100)
 
 
+def download_urls(
+    urls: list,
+    titles: list,
+    output_dir: str,
+    bitrate: str = "320K",
+    cookies_path: Optional[str] = None,
+    progress_callback: Optional[Callable] = None,
+) -> None:
+    """Scarica direttamente da URL YouTube (bypassa search).
+
+    Usa gli stessi flag yt-dlp di download_playlist. La differenza e che
+    salta lo step di ricerca perche l'URL e gia noto (usato dal flow del
+    tab "YouTube Search" dopo che l'utente ha selezionato i risultati).
+
+    Args:
+        urls: lista URL YouTube (parallela a titles)
+        titles: lista titoli video (per logging/dedupe)
+        output_dir: cartella destinazione
+        bitrate: qualita audio (default 320K)
+        cookies_path: file cookies opzionale
+        progress_callback: callback(idx, total, title, status, percent)
+    """
+    global _current_process
+    reset_stop()
+    total = len(urls)
+    out_path = Path(output_dir)
+    out_path.mkdir(parents=True, exist_ok=True)
+    done_file = out_path / ".downloaded_tracks"
+    done_set = _load_done_set(done_file)
+    existing_files = _scan_existing_files(out_path)
+    ytdlp = find_ytdlp()
+
+    for i, (url, title) in enumerate(zip(urls, titles)):
+        if is_stopped():
+            if progress_callback:
+                progress_callback(i, total, "", "stopped", 0)
+            return
+
+        key = title or url
+
+        # Salta se gia scaricato (file di tracking)
+        if key in done_set:
+            if progress_callback:
+                progress_callback(i, total, key, "skipped", 100)
+            continue
+
+        # Salta se esiste gia un file corrispondente nella cartella
+        if title and _file_exists_for_query(title, existing_files):
+            _mark_done(done_file, key)
+            done_set.add(key)
+            if progress_callback:
+                progress_callback(i, total, key, "skipped", 100)
+            continue
+
+        if progress_callback:
+            progress_callback(i, total, key, "downloading", 0)
+
+        cmd = [
+            ytdlp,
+            "--extract-audio",
+            "--audio-format", "mp3",
+            "--audio-quality", bitrate.rstrip("Kk"),
+            "--embed-thumbnail",
+            "--add-metadata",
+            "--no-check-certificates",
+            "--newline",
+            "--output", str(Path(output_dir) / "%(title)s.%(ext)s"),
+            url,
+        ]
+        ffmpeg_dir = find_ffmpeg_dir()
+        if ffmpeg_dir:
+            cmd.extend(["--ffmpeg-location", ffmpeg_dir])
+        if cookies_path and Path(cookies_path).exists():
+            cmd.extend(["--cookies", cookies_path])
+
+        try:
+            with _process_lock:
+                _current_process = subprocess.Popen(
+                    cmd, stdout=subprocess.PIPE, stderr=subprocess.STDOUT, text=True,
+                    **subprocess_flags(),
+                )
+
+            for line in _current_process.stdout:
+                if is_stopped():
+                    _current_process.terminate()
+                    if progress_callback:
+                        progress_callback(i, total, key, "stopped", 0)
+                    return
+
+                pct_match = re.search(r"(\d+(?:\.\d+)?)%", line)
+                if pct_match and progress_callback:
+                    pct = int(float(pct_match.group(1)))
+                    progress_callback(i, total, key, "downloading", pct)
+
+            return_code = _current_process.wait()
+
+            with _process_lock:
+                _current_process = None
+
+            if return_code == 0:
+                _mark_done(done_file, key)
+                done_set.add(key)
+                existing_files = _scan_existing_files(out_path)
+                if progress_callback:
+                    progress_callback(i, total, key, "done", 100)
+            else:
+                if progress_callback:
+                    progress_callback(i, total, key, f"error: yt-dlp exit {return_code}", 0)
+
+        except Exception as e:
+            with _process_lock:
+                _current_process = None
+            if progress_callback:
+                progress_callback(i, total, key, f"error: {e}", 0)
+
+    if progress_callback and not is_stopped():
+        progress_callback(total, total, "", "completed", 100)
+
+
 def _video_format(quality: str) -> str:
     """Costruisce la format string yt-dlp per la qualita richiesta."""
     if not quality or quality == "best":