from typing import List, Optional, Dict, Any, Tuple import re from dataclasses import dataclass from difflib import SequenceMatcher from unidecode import unidecode from utils.logging_config import get_logger from core.spotify_client import Track as SpotifyTrack from core.plex_client import PlexTrackInfo logger = get_logger("matching_engine") @dataclass class MatchResult: spotify_track: SpotifyTrack plex_track: Optional[PlexTrackInfo] confidence: float match_type: str @property def is_match(self) -> bool: return self.plex_track is not None and self.confidence >= 0.8 class MusicMatchingEngine: def __init__(self): # The order of these patterns is important. More general patterns go first. self.title_patterns = [ # General patterns to remove all content in brackets/parentheses r'\(.*\)', r'\[.*\]', # General pattern to remove everything after a hyphen r'\s-\s.*', # Patterns to remove featuring artists from the title itself r'\sfeat\.?.*', r'\sft\.?.*', r'\sfeaturing.*' ] self.artist_patterns = [ r'\s*feat\..*', r'\s*ft\..*', r'\s*featuring.*', r'\s*&.*', r'\s*and.*', r',.*' ] def normalize_string(self, text: str) -> str: """ Normalizes string by converting to ASCII, lowercasing, and removing specific punctuation while keeping alphanumeric characters. """ if not text: return "" text = unidecode(text) text = text.lower() # Keep alphanumeric, spaces, and hyphens, but remove other punctuation like '.' or ',' text = re.sub(r'[^\w\s-]', '', text) text = re.sub(r'\s+', ' ', text).strip() return text def clean_title(self, title: str) -> str: """Cleans title by removing common extra info using regex.""" cleaned = title for pattern in self.title_patterns: cleaned = re.sub(pattern, '', cleaned, flags=re.IGNORECASE).strip() return self.normalize_string(cleaned) def clean_artist(self, artist: str) -> str: """Cleans artist name by removing featured artists and other noise.""" cleaned = artist for pattern in self.artist_patterns: cleaned = re.sub(pattern, '', cleaned, flags=re.IGNORECASE).strip() return self.normalize_string(cleaned) def similarity_score(self, str1: str, str2: str) -> float: """Calculates similarity score between two strings.""" if not str1 or not str2: return 0.0 return SequenceMatcher(None, str1, str2).ratio() def duration_similarity(self, duration1: int, duration2: int) -> float: """Calculates similarity score based on track duration (in ms).""" if duration1 == 0 or duration2 == 0: return 0.5 # Neutral score if a duration is missing # Allow a 5-second tolerance (5000 ms) if abs(duration1 - duration2) <= 5000: return 1.0 diff_ratio = abs(duration1 - duration2) / max(duration1, duration2) return max(0, 1.0 - diff_ratio * 5) def calculate_match_confidence(self, spotify_track: SpotifyTrack, plex_track: PlexTrackInfo) -> Tuple[float, str]: """Calculates a confidence score for a potential match with a more robust, prioritized logic.""" spotify_title_cleaned = self.clean_title(spotify_track.name) plex_title_cleaned = self.clean_title(plex_track.title) # --- Artist Scoring --- spotify_artists_cleaned = [self.clean_artist(a) for a in spotify_track.artists if a] plex_artist_normalized = self.normalize_string(plex_track.artist) best_artist_score = 0.0 for spotify_artist in spotify_artists_cleaned: if spotify_artist and spotify_artist in plex_artist_normalized: best_artist_score = 1.0 break score = self.similarity_score(spotify_artist, self.clean_artist(plex_track.artist)) if score > best_artist_score: best_artist_score = score artist_score = best_artist_score # --- Title and Duration Scoring --- title_score = self.similarity_score(spotify_title_cleaned, plex_title_cleaned) duration_score = self.duration_similarity(spotify_track.duration_ms, plex_track.duration if plex_track.duration else 0) # --- Prioritized Confidence Logic --- # Priority 1: Near-perfect title and artist match is a very strong signal. if title_score > 0.98 and artist_score > 0.9: confidence = 0.98 match_type = "strong_match" # Priority 2: Exact title match, even with a weaker artist match, should have high confidence. # This helps with short titles like "Girls" or "LIL DEMON". elif title_score > 0.98: confidence = 0.90 + (artist_score * 0.05) # Base of 0.9, with a small artist bonus match_type = "exact_title_match" # Priority 3: High title similarity is still a good indicator. elif title_score > 0.9: confidence = (title_score * 0.6) + (artist_score * 0.3) + (duration_score * 0.1) match_type = "high_confidence" # Default: Standard weighted calculation for all other cases. else: confidence = (title_score * 0.5) + (artist_score * 0.3) + (duration_score * 0.2) match_type = "standard_match" return confidence, match_type def find_best_match(self, spotify_track: SpotifyTrack, plex_tracks: List[PlexTrackInfo]) -> MatchResult: """Finds the best Plex track match from a list of candidates.""" best_match = None best_confidence = 0.0 best_match_type = "no_match" if not plex_tracks: return MatchResult(spotify_track, None, 0.0, "no_candidates") for plex_track in plex_tracks: confidence, match_type = self.calculate_match_confidence(spotify_track, plex_track) if confidence > best_confidence: best_confidence = confidence best_match = plex_track best_match_type = match_type return MatchResult( spotify_track=spotify_track, plex_track=best_match, confidence=best_confidence, match_type=best_match_type )