"""
Playlist Class
Represents a music playlist
"""

from datetime import datetime

class Playlist:
    def __init__(self, playlist_id, name):
        self.playlist_id = playlist_id
        self.name = name
        self.song_ids = []
        self.created_date = datetime.now()
        self.last_modified = datetime.now()
        self.description = ""
        self.is_public = False
        self.play_count = 0
    
    def add_song(self, song_id):
        """
        Add a song to the playlist
        """
        from parameters import MAX_PLAYLIST_SIZE
        
        if len(self.song_ids) >= MAX_PLAYLIST_SIZE:
            return False
        
        if song_id not in self.song_ids:
            self.song_ids.append(song_id)
            self.last_modified = datetime.now()
            return True
        return False
    
    def remove_song(self, song_id):
        """
        Remove a song from the playlist
        """
        if song_id in self.song_ids:
            self.song_ids.remove(song_id)
            self.last_modified = datetime.now()
            return True
        return False
    
    def move_song(self, song_id, new_position):
        """
        Move a song to a new position in the playlist
        """
        if song_id in self.song_ids:
            self.song_ids.remove(song_id)
            if 0 <= new_position <= len(self.song_ids):
                self.song_ids.insert(new_position, song_id)
                self.last_modified = datetime.now()
                return True
        return False
    
    def set_description(self, description):
        """
        Set playlist description
        """
        self.description = description
    
    def set_public(self, is_public):
        """
        Set playlist visibility
        """
        self.is_public = is_public
    
    def play(self):
        """
        Increment playlist play count
        """
        self.play_count += 1
    
    def get_song_count(self):
        """
        Get number of songs in playlist
        """
        return len(self.song_ids)
    
    def shuffle(self):
        """
        Shuffle the playlist order
        """
        import random
        random.shuffle(self.song_ids)
        self.last_modified = datetime.now()
    
    def clear(self):
        """
        Remove all songs from playlist
        """
        self.song_ids = []
        self.last_modified = datetime.now()
    
    def to_dict(self):
        """
        Convert playlist to dictionary
        """
        return {
            'playlist_id': self.playlist_id,
            'name': self.name,
            'song_count': self.get_song_count(),
            'created_date': str(self.created_date),
            'last_modified': str(self.last_modified),
            'is_public': self.is_public,
            'play_count': self.play_count
        }
    
    def __str__(self):
        return f"{self.name} - {self.get_song_count()} songs"