MusicBrainz Auto-Tagging

# From tagqt/core/musicbrainz.py - API setup
import musicbrainzngs

musicbrainzngs.set_useragent("TagQt", "1.0", "https://github.com/example/tagqt")
musicbrainzngs.set_rate_limit(limit_or_interval=1.0, new_requests=1)

# From tagqt/ui/main.py - Auto-tag dialog
def _autotag_files(self, files):
    msg = QMessageBox(self)
    msg.setWindowTitle("Auto-Tag Options")
    msg.setText(f"Auto-tag {len(files)} files from MusicBrainz?")
    msg.setInformativeText("Choose how to handle files that already have tags:")
    
    skip_btn = msg.addButton("Skip Tagged Files", QMessageBox.AcceptRole)
    all_btn = msg.addButton("Process All Files", QMessageBox.ActionRole)
    cancel_btn = msg.addButton("Cancel", QMessageBox.RejectRole)

# From tagqt/core/musicbrainz.py - Searching releases
@classmethod
def search_release(cls, artist, album, track_title=None):
    if not artist and not album:
        return None
    
    def do_search():
        return musicbrainzngs.search_releases(
            artist=artist,
            release=album,
            limit=10
        )
    
    data = cls._retry(do_search)
    if not data:
        return None
        
    releases = data.get("release-list", [])
    if not releases:
        return None
    
    # Prioritize official releases
    official = [r for r in releases if r.get("status") == "Official"]
    best = official[0] if official else releases[0]

# From tagqt/core/musicbrainz.py - Title matching
@staticmethod
def normalize_title(title):
    if not title:
        return ""
    normalized = unicodedata.normalize('NFKD', title)
    normalized = normalized.encode('ascii', 'ignore').decode('ascii')
    # Remove parenthetical content
    normalized = re.sub(r'\s*\([^)]*\)\s*$', '', normalized)
    # Remove bracketed content
    normalized = re.sub(r'\s*\[[^\]]*\]\s*$', '', normalized)
    # Remove quotes/apostrophes
    normalized = re.sub(r"['\`]", "", normalized)
    # Remove punctuation
    normalized = re.sub(r'[^\w\s]', '', normalized)
    normalized = ' '.join(normalized.lower().split())
    return normalized

@classmethod
def titles_match(cls, title1, title2):
    if not title1 or not title2:
        return False
    n1 = cls.normalize_title(title1)
    n2 = cls.normalize_title(title2)
    if n1 == n2:
        return True
    if n1 in n2 or n2 in n1:
        return True
    return False

# From tagqt/core/musicbrainz.py - Genre fallback
# 1. Try release-level genres
tags = best.get("tag-list", [])
if tags:
    sorted_tags = sorted(tags, key=lambda x: int(x.get("count", 0)), reverse=True)
    result["genres"] = [t.get("name", "") for t in sorted_tags[:3]]

# 2. Fallback to release group genres
if not result["genres"] and result.get("release_group_id"):
    rg_genres = cls.lookup_release_group(result["release_group_id"])
    if rg_genres:
        result["genres"] = rg_genres

# 3. Fallback to artist genres
if not result["genres"] and result.get("artist_id"):
    artist_genres = cls.lookup_artist(result["artist_id"])
    if artist_genres:
        result["genres"] = artist_genres

# From tagqt/core/musicbrainz.py - Release lookup
@classmethod
def lookup_release(cls, release_id, track_title=None):
    if not release_id:
        return None
        
    def do_lookup():
        return musicbrainzngs.get_release_by_id(
            release_id,
            includes=["recordings", "media", "tags", "release-groups"]
        )
    
    data = cls._retry(do_lookup)
    if not data:
        return None
        
    release = data.get("release", {})
    
    # Extract disc count
    media = release.get("medium-list", [])
    result["disc_count"] = len(media)
    
    # Find matching track
    if track_title and media:
        for disc_num, disc in enumerate(media, 1):
            tracks = disc.get("track-list", [])
            for track in tracks:
                recording = track.get("recording", {})
                rec_title = recording.get("title", "")
                if cls.titles_match(track_title, rec_title):
                    result["track_disc"] = disc_num
                    result["track_position"] = int(track.get("position", 0))
                    result["track_count"] = len(tracks)

# From tagqt/core/musicbrainz.py - Retry mechanism
@classmethod
def _retry(cls, func, max_retries=3):
    import requests
    for attempt in range(max_retries):
        try:
            return func()
        except (musicbrainzngs.NetworkError, requests.exceptions.RequestException, OSError) as e:
            if attempt < max_retries - 1:
                time.sleep(2 ** attempt)  # Exponential backoff
                continue
            print(f"MusicBrainz network error after {max_retries} retries: {e}")
            return None
        except musicbrainzngs.MusicBrainzError as e:
            print(f"MusicBrainz API error: {e}")
            return None
    return None

# From tagqt/ui/main.py - Batch auto-tag
def _autotag_files(self, files):
    # ... dialog handling ...
    
    if not self._prepare_batch("Auto-Tag Status"):
        return
        
    self.progress_bar.setRange(0, len(files))
    self.progress_bar.setFormat("Auto-tagging... 0%")
    
    self._start_batch_worker(
        AutoTagWorker(files, skip_existing=skip_existing), 
        connect_log=True
    )

# From tagqt/core/musicbrainz.py
@classmethod
def lookup_release_group(cls, rg_id):
    if not rg_id:
        return []
        
    def do_lookup():
        return musicbrainzngs.get_release_group_by_id(rg_id, includes=["tags"])
    
    data = cls._retry(do_lookup)
    if not data:
        return []
        
    rg = data.get("release-group", {})
    tags = rg.get("tag-list", [])
    if tags:
        sorted_tags = sorted(tags, key=lambda x: int(x.get("count", 0)), reverse=True)
        return [t.get("name", "") for t in sorted_tags[:3]]
    return []

# From tagqt/core/musicbrainz.py
@classmethod
def lookup_artist(cls, artist_id):
    if not artist_id:
        return []
        
    def do_lookup():
        return musicbrainzngs.get_artist_by_id(artist_id, includes=["tags"])
    
    data = cls._retry(do_lookup)
    if not data:
        return []
        
    artist = data.get("artist", {})
    tags = artist.get("tag-list", [])
    if tags:
        sorted_tags = sorted(tags, key=lambda x: int(x.get("count", 0)), reverse=True)
        return [t.get("name", "") for t in sorted_tags[:3]]
    return []