feat: add multi-guild support and text channel mapping persistence via Docker volume

bot.py

@@ -15,52 +15,80 @@ GUILD_ID = os.getenv('GUILD_ID')
 class MusicBot(commands.Cog):
     def __init__(self, bot):
         self.bot = bot
-        self.queue = []
-        self.current = None
-        self.volume = 1.0  # Domyślna głośność ustawiona na 100% (1.0)
-        self.loop_current = False
-        self.last_channel = None
+        self.queues = {}           # guild_id -> list
+        self.currents = {}         # guild_id -> player
+        self.volumes = {}          # guild_id -> volume float
+        self.loop_currents = {}    # guild_id -> bool
+        self.last_channels = {}    # guild_id -> text channel
 
-    def load_saved_channel_id(self):
-        if os.path.exists("config.json"):
+    def get_queue(self, guild_id: int):
+        if guild_id not in self.queues:
+            self.queues[guild_id] = []
+        return self.queues[guild_id]
+
+    def get_current(self, guild_id: int):
+        return self.currents.get(guild_id)
+
+    def set_current(self, guild_id: int, player):
+        self.currents[guild_id] = player
+
+    def get_volume(self, guild_id: int):
+        return self.volumes.get(guild_id, 1.0)
+
+    def set_volume(self, guild_id: int, volume: float):
+        self.volumes[guild_id] = volume
+
+    def get_loop_current(self, guild_id: int):
+        return self.loop_currents.get(guild_id, False)
+
+    def set_loop_current(self, guild_id: int, loop: bool):
+        self.loop_currents[guild_id] = loop
+
+    def load_saved_channel_id(self, guild_id: int):
+        config_path = "config/config.json"
+        if os.path.exists(config_path):
             try:
                 import json
-                with open("config.json", "r") as f:
+                with open(config_path, "r") as f:
                     data = json.load(f)
-                    return data.get("text_channel_id")
+                    val = data.get(str(guild_id))
+                    return int(val) if val is not None else None
             except Exception as e:
                 print(f"Error loading config: {e}")
         return None
 
-    def save_channel_id(self, channel_id):
+    def save_channel_id(self, guild_id: int, channel_id: int):
+        config_path = "config/config.json"
         try:
             import json
+            os.makedirs(os.path.dirname(config_path), exist_ok=True)
             data = {}
-            if os.path.exists("config.json"):
-                with open("config.json", "r") as f:
+            if os.path.exists(config_path):
+                with open(config_path, "r") as f:
                     data = json.load(f)
-            data["text_channel_id"] = channel_id
-            with open("config.json", "w") as f:
+            data[str(guild_id)] = channel_id
+            with open(config_path, "w") as f:
                 json.dump(data, f, indent=4)
         except Exception as e:
             print(f"Error saving config: {e}")
 
-    def get_notification_channel(self):
-        if self.last_channel:
-            return self.last_channel
+    def get_notification_channel(self, guild_id: int):
+        if self.last_channels.get(guild_id):
+            return self.last_channels[guild_id]
 
-        saved_id = self.load_saved_channel_id()
+        saved_id = self.load_saved_channel_id(guild_id)
         if saved_id:
             channel = self.bot.get_channel(int(saved_id))
             if channel:
-                self.last_channel = channel
+                self.last_channels[guild_id] = channel
                 return channel
 
-        voice_client = self.bot.voice_clients[0] if self.bot.voice_clients else None
-        if voice_client and voice_client.channel:
-            for tc in voice_client.channel.guild.text_channels:
-                if tc.permissions_for(voice_client.channel.guild.me).send_messages:
-                    self.last_channel = tc
+        # Fallback to the first accessible channel in the guild
+        guild = self.bot.get_guild(guild_id)
+        if guild:
+            for tc in guild.text_channels:
+                if tc.permissions_for(guild.me).send_messages:
+                    self.last_channels[guild_id] = tc
                     return tc
 
         return None
@@ -92,23 +120,24 @@ class MusicBot(commands.Cog):
             return
 
         await interaction.response.defer()
-        self.last_channel = interaction.channel
+        guild_id = interaction.guild.id
+        self.last_channels[guild_id] = interaction.channel
 
         try:
             player = await YTDLSource.from_url(query, loop=self.bot.loop, stream=True)
 
             if interaction.guild.voice_client.is_playing():
-                self.queue.append(player)
+                self.get_queue(guild_id).append(player)
                 await interaction.followup.send(
                     f"Dodano do kolejki: {player.title}",
                     ephemeral=False
                 )
             else:
-                self.current = player
+                self.set_current(guild_id, player)
                 interaction.guild.voice_client.play(
                     player,
                     after=lambda e: asyncio.run_coroutine_threadsafe(
-                        self.play_next(),
+                        self.play_next(guild_id),
                         self.bot.loop
                     )
                 )
@@ -122,45 +151,50 @@ class MusicBot(commands.Cog):
                 ephemeral=True
             )
 
-    async def play_next(self):
-        voice_client = self.bot.voice_clients[0] if self.bot.voice_clients else None
+    async def play_next(self, guild_id: int):
+        voice_client = discord.utils.get(self.bot.voice_clients, guild__id=guild_id)
         if not voice_client:
-            self.current = None
+            self.set_current(guild_id, None)
             return
 
-        if self.loop_current and self.current:
+        loop_current = self.get_loop_current(guild_id)
+        current = self.get_current(guild_id)
+
+        if loop_current and current:
             try:
-                url = self.current.data.get('webpage_url') or self.current.url
+                url = current.data.get('webpage_url') or current.url
                 player = await YTDLSource.from_url(url, loop=self.bot.loop, stream=True)
-                self.current = player
+                self.set_current(guild_id, player)
                 voice_client.play(
-                    self.current,
+                    player,
                     after=lambda e: asyncio.run_coroutine_threadsafe(
-                        self.play_next(),
+                        self.play_next(guild_id),
                         self.bot.loop
                     )
                 )
-                await self.send_to_last_channel(f"Teraz odtwarzane (zapętlone): {self.current.title}")
+                await self.send_to_last_channel(guild_id, f"Teraz odtwarzane (zapętlone): {player.title}")
                 return
             except Exception as e:
                 print(f"Error repeating song: {e}")
 
-        if len(self.queue) > 0:
-            self.current = self.queue.pop(0)
+        queue = self.get_queue(guild_id)
+        if len(queue) > 0:
+            next_player = queue.pop(0)
+            self.set_current(guild_id, next_player)
             voice_client.play(
-                self.current,
+                next_player,
                 after=lambda e: asyncio.run_coroutine_threadsafe(
-                    self.play_next(),
+                    self.play_next(guild_id),
                     self.bot.loop
                 )
             )
-            await self.send_to_last_channel(f"Teraz odtwarzane: {self.current.title}")
+            await self.send_to_last_channel(guild_id, f"Teraz odtwarzane: {next_player.title}")
         else:
-            self.current = None
-            await self.send_to_last_channel("Kolejka jest pusta.")
+            self.set_current(guild_id, None)
+            await self.send_to_last_channel(guild_id, "Kolejka jest pusta.")
 
-    async def send_to_last_channel(self, text):
-        channel = self.get_notification_channel()
+    async def send_to_last_channel(self, guild_id: int, text: str):
+        channel = self.get_notification_channel(guild_id)
         if channel:
             try:
                 await channel.send(text)
@@ -170,14 +204,16 @@ class MusicBot(commands.Cog):
     @app_commands.command(name="queue", description="Pokaż aktualną kolejkę")
     async def show_queue(self, interaction: discord.Interaction):
         """Pokaż aktualną kolejkę"""
-        if not self.queue:
+        guild_id = interaction.guild.id
+        queue = self.get_queue(guild_id)
+        if not queue:
             await interaction.response.send_message(
                 "Kolejka jest pusta.",
                 ephemeral=True
             )
             return
 
-        queue_list = "\n".join([f"{i + 1}. {item.title}" for i, item in enumerate(self.queue)])
+        queue_list = "\n".join([f"{i + 1}. {item.title}" for i, item in enumerate(queue)])
         await interaction.response.send_message(
             f"Aktualna kolejka:\n{queue_list}",
             ephemeral=False
@@ -231,10 +267,11 @@ class MusicBot(commands.Cog):
     @app_commands.command(name="stop", description="Zatrzymaj odtwarzanie i wyczyść kolejkę")
     async def stop(self, interaction: discord.Interaction):
         """Zatrzymaj odtwarzanie i wyczyść kolejkę"""
+        guild_id = interaction.guild.id
         if interaction.guild.voice_client.is_playing():
             interaction.guild.voice_client.stop()
-        self.queue.clear()
-        self.current = None
+        self.get_queue(guild_id).clear()
+        self.set_current(guild_id, None)
         await interaction.response.send_message(
             "Zatrzymano odtwarzanie i wyczyszczono kolejkę.",
             ephemeral=False
@@ -244,6 +281,7 @@ class MusicBot(commands.Cog):
     @app_commands.describe(volume="Poziom głośności (1-100)")
     async def volume(self, interaction: discord.Interaction, volume: int):
         """Zmień głośność odtwarzacza"""
+        guild_id = interaction.guild.id
         if interaction.guild.voice_client is None:
             return await interaction.response.send_message(
                 "Nie połączono z kanałem głosowym.",
@@ -251,8 +289,8 @@ class MusicBot(commands.Cog):
             )
 
         if 0 < volume <= 100:
-            self.volume = volume / 100
-            interaction.guild.voice_client.source.volume = self.volume
+            self.set_volume(guild_id, volume / 100)
+            interaction.guild.voice_client.source.volume = self.get_volume(guild_id)
             await interaction.response.send_message(
                 f"Zmieniono głośność na {volume}%",
                 ephemeral=False
@@ -268,9 +306,11 @@ class MusicBot(commands.Cog):
     @app_commands.command(name="nowplaying", description="Pokaż aktualnie odtwarzany utwór")
     async def now_playing(self, interaction: discord.Interaction):
         """Pokaż aktualnie odtwarzany utwór"""
-        if self.current:
+        guild_id = interaction.guild.id
+        current = self.get_current(guild_id)
+        if current:
             await interaction.response.send_message(
-                f"Teraz odtwarzane: {self.current.title}",
+                f"Teraz odtwarzane: {current.title}",
                 ephemeral=False
             )
         else:
@@ -282,10 +322,11 @@ class MusicBot(commands.Cog):
     @app_commands.command(name="leave", description="Odłącz bota od kanału głosowego")
     async def leave(self, interaction: discord.Interaction):
         """Odłącz bota od kanału głosowego"""
+        guild_id = interaction.guild.id
         if interaction.guild.voice_client is not None:
             await interaction.guild.voice_client.disconnect()
-            self.queue.clear()
-            self.current = None
+            self.get_queue(guild_id).clear()
+            self.set_current(guild_id, None)
             await interaction.response.send_message(
                 "Rozłączono z kanału głosowego.",
                 ephemeral=False
@@ -299,8 +340,10 @@ class MusicBot(commands.Cog):
     @app_commands.command(name="loop", description="Włącz/wyłącz zapętlanie aktualnego utworu")
     async def loop_command(self, interaction: discord.Interaction):
         """Włącz/wyłącz zapętlanie aktualnego utworu"""
-        self.loop_current = not self.loop_current
-        state = "włączone" if self.loop_current else "wyłączone"
+        guild_id = interaction.guild.id
+        loop_current = not self.get_loop_current(guild_id)
+        self.set_loop_current(guild_id, loop_current)
+        state = "włączone" if loop_current else "wyłączone"
         await interaction.response.send_message(
             f"Zapętlanie aktualnego utworu zostało {state}.",
             ephemeral=False