LEDMatrix/src/music_manager.py

import time
import threading
from enum import Enum, auto
import logging
import json
import os
from io import BytesIO
import requests
from PIL import Image, ImageEnhance

# Use relative imports for clients within the same package (src)
from .spotify_client import SpotifyClient
from .ytm_client import YTMClient
# Removed: import config

# Configure logging
logging.basicConfig(level=logging.INFO, format='%(asctime)s - %(levelname)s - %(message)s')
logger = logging.getLogger(__name__)

# Define paths relative to this file's location
CONFIG_DIR = os.path.join(os.path.dirname(__file__), '..', 'config')
CONFIG_PATH = os.path.join(CONFIG_DIR, 'config.json')
# SECRETS_PATH is handled within SpotifyClient

class MusicSource(Enum):
    NONE = auto()
    SPOTIFY = auto()
    YTM = auto()

class MusicManager:
    def __init__(self, display_manager, config, update_callback=None):
        self.display_manager = display_manager
        self.config = config
        self.spotify = None
        self.ytm = None
        self.current_track_info = None
        self.current_source = MusicSource.NONE
        self.update_callback = update_callback
        self.polling_interval = 2 # Default
        self.enabled = False # Default
        self.preferred_source = "auto" # Default
        self.stop_event = threading.Event()
        self.track_info_lock = threading.Lock() # Added lock

        # Display related attributes moved from DisplayController
        self.album_art_image = None
        self.last_album_art_url = None
        self.scroll_position_title = 0
        self.scroll_position_artist = 0
        self.title_scroll_tick = 0
        self.artist_scroll_tick = 0
        self.is_music_display_active = False # New state variable
        
        self._load_config() # Load config first
        self._initialize_clients() # Initialize based on loaded config
        self.poll_thread = None

    def _load_config(self):
        default_interval = 2
        default_preferred_source = "auto"
        self.enabled = False # Assume disabled until config proves otherwise

        if not os.path.exists(CONFIG_PATH):
            logging.warning(f"Config file not found at {CONFIG_PATH}. Music manager disabled.")
            return

        try:
            with open(CONFIG_PATH, 'r') as f:
                config_data = json.load(f)
                music_config = config_data.get("music", {})

                self.enabled = music_config.get("enabled", False)
                self.polling_interval = music_config.get("POLLING_INTERVAL_SECONDS", default_interval)
                self.preferred_source = music_config.get("preferred_source", default_preferred_source).lower()

                if not self.enabled:
                    logging.info("Music manager is disabled in config.json.")
                    return # Don't proceed further if disabled

                logging.info(f"Music manager enabled. Polling interval: {self.polling_interval}s. Preferred source: {self.preferred_source}")

        except json.JSONDecodeError:
            logging.error(f"Error decoding JSON from {CONFIG_PATH}. Music manager disabled.")
            self.enabled = False
        except Exception as e:
            logging.error(f"Error loading music config: {e}. Music manager disabled.")
            self.enabled = False

    def _initialize_clients(self):
        # Only initialize if the manager is enabled
        if not self.enabled:
            self.spotify = None
            self.ytm = None
            return

        logging.info("Initializing music clients...")

        # Initialize Spotify Client if needed
        if self.preferred_source in ["auto", "spotify"]:
            try:
                self.spotify = SpotifyClient()
                if not self.spotify.is_authenticated():
                    logging.warning("Spotify client initialized but not authenticated. Please run src/authenticate_spotify.py if you want to use Spotify.")
                    # The SpotifyClient will log more details if cache loading failed.
                    # No need to attempt auth URL generation here.
                else:
                    logging.info("Spotify client authenticated.")

            except Exception as e:
                logging.error(f"Failed to initialize Spotify client: {e}")
                self.spotify = None
        else:
            logging.info("Spotify client initialization skipped due to preferred_source setting.")
            self.spotify = None

        # Initialize YTM Client if needed
        if self.preferred_source in ["auto", "ytm"]:
            try:
                self.ytm = YTMClient(update_callback=self._handle_ytm_direct_update)
                # We no longer check is_available() or connect here. Connection is on-demand.
                logging.info(f"YTMClient initialized. Connection will be managed on-demand. Configured URL: {self.ytm.base_url}")
            except Exception as e:
                logging.error(f"Failed to initialize YTM client: {e}")
                self.ytm = None
        else:
            logging.info("YTM client initialization skipped due to preferred_source setting.")
            self.ytm = None

    def activate_music_display(self):
        logger.info("Music display activated.")
        self.is_music_display_active = True
        if self.ytm and self.preferred_source in ["auto", "ytm"]:
            if not self.ytm.is_connected:
                logger.info("Attempting to connect YTM client due to music display activation.")
                # Pass a reasonable timeout for on-demand connection
                if self.ytm.connect_client(timeout=10):
                    logger.info("YTM client connected successfully on display activation.")
                else:
                    logger.warning("YTM client failed to connect on display activation.")
            else:
                logger.debug("YTM client already connected during music display activation.")

    def deactivate_music_display(self):
        logger.info("Music display deactivated.")
        self.is_music_display_active = False
        if self.ytm and self.ytm.is_connected:
            logger.info("Disconnecting YTM client due to music display deactivation.")
            self.ytm.disconnect_client()

    def _handle_ytm_direct_update(self, ytm_data):
        """Handles a direct state update from YTMClient."""
        logger.debug(f"MusicManager received direct YTM update: {ytm_data.get('track', {}).get('title') if ytm_data else 'No Data'}")

        if not self.enabled or not self.is_music_display_active: # Check if display is active
            logger.debug("Skipping YTM direct update: Manager disabled or music display not active.")
            return

        # Only process if YTM is the preferred source, or if auto and Spotify isn't actively playing.
        spotify_is_playing_flag = False
        with self.track_info_lock:
            if self.current_source == MusicSource.SPOTIFY and self.current_track_info and self.current_track_info.get('is_playing'):
                spotify_is_playing_flag = True

        if not (self.preferred_source == "ytm" or (self.preferred_source == "auto" and not spotify_is_playing_flag)):
            logger.debug("Skipping YTM direct update due to preferred_source/Spotify state.")
            return

        player_info = ytm_data.get('player', {})
        is_actually_playing_ytm = (player_info.get('trackState') == 1) and not player_info.get('adPlaying', False)

        simplified_info = self.get_simplified_track_info(ytm_data if is_actually_playing_ytm else None, 
                                                       MusicSource.YTM if is_actually_playing_ytm else MusicSource.NONE)

        has_changed = False
        with self.track_info_lock:
            if simplified_info != self.current_track_info:
                has_changed = True
                old_album_art_url = self.current_track_info.get('album_art_url') if self.current_track_info else None
                new_album_art_url = simplified_info.get('album_art_url') if simplified_info else None

                self.current_track_info = simplified_info
                self.current_source = MusicSource.YTM if is_actually_playing_ytm and simplified_info.get('source') == 'YouTube Music' else self.current_source
                if not is_actually_playing_ytm and self.current_source == MusicSource.YTM:
                    self.current_source = MusicSource.NONE 

                if new_album_art_url != old_album_art_url:
                    self.album_art_image = None
                    self.last_album_art_url = new_album_art_url
                
                display_title = self.current_track_info.get('title', 'None') if self.current_track_info else 'None'
                logger.debug(f"YTM Direct Update: Track change detected. Source: {self.current_source.name}. Track: {display_title}")
            else:
                logger.debug("YTM Direct Update: No change in simplified track info.")

        if has_changed and self.update_callback:
            try:
                # Pass a copy of the track info to the callback
                with self.track_info_lock:
                    track_info_copy = self.current_track_info.copy() if self.current_track_info else None
                self.update_callback(track_info_copy) 
            except Exception as e:
                logger.error(f"Error executing DisplayController update callback from YTM direct update: {e}")

    def _fetch_and_resize_image(self, url: str, target_size: tuple[int, int]) -> Image.Image | None:
        """Fetches an image from a URL, resizes it, and returns a PIL Image object."""
        if not url:
            return None
        try:
            response = requests.get(url, timeout=5) # 5-second timeout for image download
            response.raise_for_status() # Raise an exception for bad status codes
            img_data = BytesIO(response.content)
            img = Image.open(img_data)
            
            # Ensure image is RGB for compatibility with the matrix
            img = img.convert("RGB") 
            
            img.thumbnail(target_size, Image.Resampling.LANCZOS)

            # Enhance contrast
            enhancer_contrast = ImageEnhance.Contrast(img)
            img = enhancer_contrast.enhance(1.3) # Adjust 1.3 as needed

            # Enhance saturation (Color)
            enhancer_saturation = ImageEnhance.Color(img)
            img = enhancer_saturation.enhance(1.3) # Adjust 1.3 as needed
            
            final_img = Image.new("RGB", target_size, (0,0,0)) # Black background
            paste_x = (target_size[0] - img.width) // 2
            paste_y = (target_size[1] - img.height) // 2
            final_img.paste(img, (paste_x, paste_y))
            
            return final_img
        except requests.exceptions.RequestException as e:
            logger.error(f"Error fetching image from {url}: {e}")
            return None
        except IOError as e:
            logger.error(f"Error processing image from {url}: {e}")
            return None
        except Exception as e:
            logger.error(f"Unexpected error fetching/processing image {url}: {e}")
            return None

    def _poll_music_data(self):
        """Continuously polls music sources for updates, respecting preferences."""
        if not self.enabled:
             logging.warning("Polling attempted while music manager is disabled. Stopping polling thread.")
             return

        while not self.stop_event.is_set():
            polled_track_info_data = None
            polled_source = MusicSource.NONE
            is_playing_from_poll = False # Renamed to avoid conflict

            poll_spotify = self.preferred_source in ["auto", "spotify"] and self.spotify and self.spotify.is_authenticated()
            poll_ytm = self.preferred_source in ["auto", "ytm"] and self.ytm

            if poll_spotify:
                try:
                    spotify_track = self.spotify.get_current_track()
                    if spotify_track and spotify_track.get('is_playing'):
                        polled_track_info_data = spotify_track
                        polled_source = MusicSource.SPOTIFY
                        is_playing_from_poll = True
                        logging.debug(f"Polling Spotify: Active track - {spotify_track.get('item', {}).get('name')}")
                    else:
                        logging.debug("Polling Spotify: No active track or player paused.")
                except Exception as e:
                    logging.error(f"Error polling Spotify: {e}")
                    if "token" in str(e).lower():
                        logging.warning("Spotify auth token issue detected during polling.")
            
            should_poll_ytm_now = poll_ytm and (self.preferred_source == "ytm" or (self.preferred_source == "auto" and not is_playing_from_poll))

            if should_poll_ytm_now:
                if self.ytm and self.ytm.is_connected:
                    try:
                        ytm_track_data = self.ytm.get_current_track() # Data from YTMClient's cache
                        if ytm_track_data and ytm_track_data.get('player') and not ytm_track_data.get('player', {}).get('isPaused') and not ytm_track_data.get('player',{}).get('adPlaying', False):
                            if self.preferred_source == "ytm" or not is_playing_from_poll:
                                polled_track_info_data = ytm_track_data
                                polled_source = MusicSource.YTM
                                is_playing_from_poll = True # YTM is now considered playing
                                logger.debug(f"Polling YTM: Active track - {ytm_track_data.get('track', {}).get('title')}")
                        else:
                            logging.debug("Polling YTM: No active track or player paused (or track data missing player info).")
                    except Exception as e:
                        logging.error(f"Error polling YTM: {e}")
                else:
                    logging.debug("Skipping YTM poll: Client not initialized or not connected.")
                     # Consider setting self.ytm = None if it becomes unavailable repeatedly?

            simplified_info_poll = self.get_simplified_track_info(polled_track_info_data, polled_source)

            has_changed_poll = False
            with self.track_info_lock:
                if simplified_info_poll != self.current_track_info:
                    has_changed_poll = True
                    old_album_art_url_poll = self.current_track_info.get('album_art_url') if self.current_track_info else None
                    new_album_art_url_poll = simplified_info_poll.get('album_art_url') if simplified_info_poll else None

                    self.current_track_info = simplified_info_poll
                    self.current_source = polled_source

                    if new_album_art_url_poll != old_album_art_url_poll:
                        self.album_art_image = None
                        self.last_album_art_url = new_album_art_url_poll
                    
                    display_title_poll = self.current_track_info.get('title', 'None') if self.current_track_info else 'None'
                    logger.debug(f"Poll Update: Track change detected. Source: {self.current_source.name}. Track: {display_title_poll}")
                else:
                    logger.debug("Poll Update: No change in simplified track info.")

            if has_changed_poll and self.update_callback:
                try:
                    with self.track_info_lock:
                        track_info_copy_poll = self.current_track_info.copy() if self.current_track_info else None
                    self.update_callback(track_info_copy_poll)
                except Exception as e:
                    logger.error(f"Error executing update callback from poll: {e}")
            
            time.sleep(self.polling_interval)

    # Modified to accept data and source, making it more testable/reusable
    def get_simplified_track_info(self, track_data, source):
        """Provides a consistent format for track info regardless of source."""
        
        # Default "Nothing Playing" structure
        nothing_playing_info = {
            'source': 'None',
            'title': 'Nothing Playing',
            'artist': '',
            'album': '',
            'album_art_url': None,
            'duration_ms': 0,
            'progress_ms': 0,
            'is_playing': False,
        }

        if source == MusicSource.SPOTIFY and track_data:
            item = track_data.get('item', {})
            is_playing_spotify = track_data.get('is_playing', False)

            if not item or not is_playing_spotify:
                return nothing_playing_info.copy()

            return {
                'source': 'Spotify',
                'title': item.get('name'),
                'artist': ', '.join([a['name'] for a in item.get('artists', [])]),
                'album': item.get('album', {}).get('name'),
                'album_art_url': item.get('album', {}).get('images', [{}])[0].get('url') if item.get('album', {}).get('images') else None,
                'duration_ms': item.get('duration_ms'),
                'progress_ms': track_data.get('progress_ms'),
                'is_playing': is_playing_spotify, # Should be true here
            }
        elif source == MusicSource.YTM and track_data:
            video_info = track_data.get('video', {})
            player_info = track_data.get('player', {})

            title = video_info.get('title') # Check if title exists
            artist = video_info.get('author')
            
            # Play state: player_info.trackState: -1 Unknown, 0 Paused, 1 Playing, 2 Buffering
            track_state = player_info.get('trackState')
            is_playing_ytm = (track_state == 1) # 1 means Playing

            if player_info.get('adPlaying', False):
                is_playing_ytm = False 
                logging.debug("YTM: Ad is playing, reporting track as not actively playing.")

            if not title or not artist or not is_playing_ytm: # If no title/artist, or not truly playing
                return nothing_playing_info.copy()

            album = video_info.get('album')
            duration_seconds = video_info.get('durationSeconds')
            duration_ms = int(duration_seconds * 1000) if duration_seconds is not None else 0
            progress_seconds = player_info.get('videoProgress')
            progress_ms = int(progress_seconds * 1000) if progress_seconds is not None else 0
            thumbnails = video_info.get('thumbnails', [])
            album_art_url = thumbnails[0].get('url') if thumbnails else None

            return {
                'source': 'YouTube Music',
                'title': title,
                'artist': artist,
                'album': album if album else '',
                'album_art_url': album_art_url,
                'duration_ms': duration_ms,
                'progress_ms': progress_ms,
                'is_playing': is_playing_ytm, # Should be true here
            }
        else:
            # This covers cases where source is NONE, or track_data is None for Spotify/YTM
            return nothing_playing_info.copy()

    def get_current_display_info(self):
        """Returns the currently stored track information for display."""
        with self.track_info_lock:
            return self.current_track_info.copy() if self.current_track_info else None

    def start_polling(self):
        # Only start polling if enabled
        if not self.enabled:
            logging.info("Music manager disabled, polling not started.")
            return

        if not self.poll_thread or not self.poll_thread.is_alive():
            # Ensure at least one client is potentially available
            if not self.spotify and not self.ytm:
                 logging.warning("Cannot start polling: No music clients initialized or available.")
                 return

            self.stop_event.clear()
            self.poll_thread = threading.Thread(target=self._poll_music_data, daemon=True)
            self.poll_thread.start()
            logging.info("Music polling started.")

    def stop_polling(self):
        """Stops the music polling thread."""
        logger.info("Music manager: Stopping polling thread...")
        self.stop_event.set()
        if self.poll_thread and self.poll_thread.is_alive():
            self.poll_thread.join(timeout=self.polling_interval + 1) # Wait for thread to finish
        if self.poll_thread and self.poll_thread.is_alive():
            logger.warning("Music manager: Polling thread did not terminate cleanly.")
        else:
            logger.info("Music manager: Polling thread stopped.")
        self.poll_thread = None # Clear the thread object
        # Also ensure YTM client is disconnected when polling stops completely
        self.deactivate_music_display() # This will also handle YTM disconnect if needed

    # Method moved from DisplayController and renamed
    def display(self, force_clear: bool = False):
        if force_clear: 
            self.display_manager.clear()
            self.activate_music_display() 

        with self.track_info_lock:
            current_display_info = self.current_track_info.copy() if self.current_track_info else None
            # We also need self.last_album_art_url and self.album_art_image under the same lock if they are read here and written elsewhere
            # For now, last_album_art_url is updated along with current_track_info under the lock
            # album_art_image is assigned here or if it's None and last_album_art_url exists, fetched.
            # Let's assume current_display_info correctly snapshots necessary parts or that album art fetching uses locked members.
            local_last_album_art_url = self.last_album_art_url
            local_album_art_image = self.album_art_image

        # Simplified condition to prevent "Nothing Playing" flicker:
        # Show screen if we have any track info, unless it's explicitly "Nothing Playing".
        # The 'is_playing' check within get_simplified_track_info should handle ads/paused state correctly by returning 'Nothing Playing' title if appropriate.
        if not current_display_info or current_display_info.get('title') == 'Nothing Playing':
            if not hasattr(self, '_last_nothing_playing_log_time') or \
               time.time() - getattr(self, '_last_nothing_playing_log_time', 0) > 30:
                logger.info("Music Screen (MusicManager): Nothing playing or info explicitly 'Nothing Playing'.")
                self._last_nothing_playing_log_time = time.time()

            if not force_clear:
                 self.display_manager.clear()

            text_width = self.display_manager.get_text_width("Nothing Playing", self.display_manager.regular_font)
            x_pos = (self.display_manager.matrix.width - text_width) // 2
            y_pos = (self.display_manager.matrix.height // 2) - 4
            self.display_manager.draw_text("Nothing Playing", x=x_pos, y=y_pos, font=self.display_manager.regular_font)
            self.display_manager.update_display()

            with self.track_info_lock: # Protect writes to shared state
                self.scroll_position_title = 0
                self.scroll_position_artist = 0
                self.title_scroll_tick = 0
                self.artist_scroll_tick = 0
                self.album_art_image = None # Clear any fetched art if we are showing Nothing Playing
                # self.last_album_art_url = None # Keep last_album_art_url so we don't re-fetch if it was a brief flicker
            return

        # If we've reached here, it means we are about to display actual music info.
        if not self.is_music_display_active:
            self.activate_music_display()

        if not force_clear:
            self.display_manager.draw.rectangle([0, 0, self.display_manager.matrix.width, self.display_manager.matrix.height], fill=(0, 0, 0))

        matrix_height = self.display_manager.matrix.height
        album_art_size = matrix_height - 2 
        album_art_target_size = (album_art_size, album_art_size)
        album_art_x = 1
        album_art_y = 1
        text_area_x_start = album_art_x + album_art_size + 2 
        text_area_width = self.display_manager.matrix.width - text_area_x_start - 1 

        # Fetch and display album art using local_last_album_art_url and potentially updating self.album_art_image
        if local_last_album_art_url and not local_album_art_image: # Check local_album_art_image
            logger.info(f"MusicManager: Fetching album art from: {local_last_album_art_url}")
            fetched_image = self._fetch_and_resize_image(local_last_album_art_url, album_art_target_size)
            if fetched_image:
                 logger.info(f"MusicManager: Album art fetched and processed successfully.")
                 with self.track_info_lock:
                    self.album_art_image = fetched_image # Update shared state
                    local_album_art_image = fetched_image # Update local copy for current render
            else:
                logger.warning(f"MusicManager: Failed to fetch or process album art.")
                # Do not clear self.album_art_image here, might be a temporary glitch

        if local_album_art_image: # Use local_album_art_image for display
            self.display_manager.image.paste(local_album_art_image, (album_art_x, album_art_y))
        else:
            self.display_manager.draw.rectangle([album_art_x, album_art_y, 
                                                 album_art_x + album_art_size -1, album_art_y + album_art_size -1],
                                                 outline=(50,50,50), fill=(10,10,10))

        # Use current_display_info for text, which is a snapshot from the beginning of the method
        title = current_display_info.get('title', ' ')
        artist = current_display_info.get('artist', ' ')
        album = current_display_info.get('album', ' ') 

        font_title = self.display_manager.small_font
        font_artist_album = self.display_manager.bdf_5x7_font
        line_height_title = 8 
        line_height_artist_album = 7 
        padding_between_lines = 1 

        TEXT_SCROLL_DIVISOR = 5 

        # --- Title --- 
        y_pos_title = 2 
        title_width = self.display_manager.get_text_width(title, font_title)
        current_title_display_text = title
        if title_width > text_area_width:
            if self.scroll_position_title >= len(title):
                self.scroll_position_title = 0
            current_title_display_text = title[self.scroll_position_title:] + "   " + title[:self.scroll_position_title]
        
        self.display_manager.draw_text(current_title_display_text, 
                                     x=text_area_x_start, y=y_pos_title, color=(255, 255, 255), font=font_title)
        if title_width > text_area_width:
            self.title_scroll_tick += 1
            if self.title_scroll_tick % TEXT_SCROLL_DIVISOR == 0:
                self.scroll_position_title = (self.scroll_position_title + 1) % len(title)
                self.title_scroll_tick = 0 
        else:
            self.scroll_position_title = 0
            self.title_scroll_tick = 0

        # --- Artist --- 
        y_pos_artist = y_pos_title + line_height_title + padding_between_lines
        artist_width = self.display_manager.get_text_width(artist, font_artist_album)
        current_artist_display_text = artist
        if artist_width > text_area_width:
            if self.scroll_position_artist >= len(artist):
                self.scroll_position_artist = 0
            current_artist_display_text = artist[self.scroll_position_artist:] + "   " + artist[:self.scroll_position_artist]

        self.display_manager.draw_text(current_artist_display_text, 
                                      x=text_area_x_start, y=y_pos_artist, color=(180, 180, 180), font=font_artist_album)
        if artist_width > text_area_width:
            self.artist_scroll_tick += 1
            if self.artist_scroll_tick % TEXT_SCROLL_DIVISOR == 0:
                self.scroll_position_artist = (self.scroll_position_artist + 1) % len(artist)
                self.artist_scroll_tick = 0
        else:
            self.scroll_position_artist = 0
            self.artist_scroll_tick = 0
            
        # --- Album ---
        y_pos_album = y_pos_artist + line_height_artist_album + padding_between_lines
        if (matrix_height - y_pos_album - 5) >= line_height_artist_album : 
            album_width = self.display_manager.get_text_width(album, font_artist_album)
            if album_width <= text_area_width: 
                 self.display_manager.draw_text(album, x=text_area_x_start, y=y_pos_album, color=(150, 150, 150), font=font_artist_album)

        # --- Progress Bar --- 
        progress_bar_height = 3
        progress_bar_y = matrix_height - progress_bar_height - 1 
        duration_ms = current_display_info.get('duration_ms', 0)
        progress_ms = current_display_info.get('progress_ms', 0)

        if duration_ms > 0:
            bar_total_width = text_area_width
            filled_ratio = progress_ms / duration_ms
            filled_width = int(filled_ratio * bar_total_width)

            self.display_manager.draw.rectangle([
                text_area_x_start, progress_bar_y, 
                text_area_x_start + bar_total_width -1, progress_bar_y + progress_bar_height -1
            ], outline=(60, 60, 60), fill=(30,30,30)) 
            
            if filled_width > 0:
                self.display_manager.draw.rectangle([
                    text_area_x_start, progress_bar_y, 
                    text_area_x_start + filled_width -1, progress_bar_y + progress_bar_height -1
                ], fill=(200, 200, 200)) 

        self.display_manager.update_display()


# Example usage (for testing this module standalone, if needed)
# def print_update(track_info):
# logging.info(f"Callback: Track update received by dummy callback: {track_info}")

if __name__ == '__main__':
    # This is a placeholder for testing. 
    # To test properly, you'd need a mock DisplayManager and ConfigManager.
    logging.basicConfig(level=logging.DEBUG)
    logger.info("Running MusicManager standalone test (limited)...")

    # Mock DisplayManager and Config objects
    class MockDisplayManager:
        def __init__(self):
            self.matrix = type('Matrix', (), {'width': 64, 'height': 32})() # Mock matrix
            self.image = Image.new("RGB", (self.matrix.width, self.matrix.height))
            self.draw = ImageDraw.Draw(self.image) # Requires ImageDraw
            self.regular_font = None # Needs font loading
            self.small_font = None
            self.extra_small_font = None
            # Add other methods/attributes DisplayManager uses if they are called by MusicManager's display
            # For simplicity, we won't fully mock font loading here.
            # self.regular_font = ImageFont.truetype("path/to/font.ttf", 8) 


        def clear(self): logger.debug("MockDisplayManager: clear() called")
        def get_text_width(self, text, font): return len(text) * 5 # Rough mock
        def draw_text(self, text, x, y, color=(255,255,255), font=None): logger.debug(f"MockDisplayManager: draw_text '{text}' at ({x},{y})")
        def update_display(self): logger.debug("MockDisplayManager: update_display() called")

    class MockConfig:
        def get(self, key, default=None):
            if key == "music":
                return {"enabled": True, "POLLING_INTERVAL_SECONDS": 2, "preferred_source": "auto"}
            return default

    # Need to import ImageDraw for the mock to work if draw_text is complex
    try: from PIL import ImageDraw, ImageFont 
    except ImportError: ImageDraw = None; ImageFont = None; logger.warning("Pillow ImageDraw/ImageFont not fully available for mock")


    mock_display = MockDisplayManager()
    mock_config_main = {"music": {"enabled": True, "POLLING_INTERVAL_SECONDS": 2, "preferred_source": "auto"}}
    
    # The MusicManager expects the overall config, not just the music part directly for its _load_config
    # So we simulate a config object that has a .get('music', {}) method.
    # However, MusicManager's _load_config reads from CONFIG_PATH.
    # For a true standalone test, we might need to mock file IO or provide a test config file.

    # Simplified test:
    # manager = MusicManager(display_manager=mock_display, config=mock_config_main) # This won't work due to file reading
    
    # To truly test, you'd point CONFIG_PATH to a test config.json or mock open()
    # For now, this __main__ block is mostly a placeholder.
    logger.info("MusicManager standalone test setup is complex due to file dependencies for config.")
    logger.info("To test: run the main application and observe logs from MusicManager.")
    # if manager.enabled:
    # manager.start_polling()
    # try:
    # while True:
    #         time.sleep(1)
    #         # In a real test, you might manually call manager.display() after setting some track info
    # except KeyboardInterrupt:
    #         logger.info("Stopping standalone test...")
    # finally:
    # if manager.enabled:
    # manager.stop_polling()
    #         logger.info("Test finished.")