feat: make the bot leave, if they are the last one in the vc

Signed-off-by: moonleay <contact@moonleay.net>

src/main/kotlin/net/moonleay/botendo/Bot.kt

@@ -21,18 +21,25 @@ package net.moonleay.botendo
 
 import com.kotlindiscord.kord.extensions.ExtensibleBot
 import dev.kord.common.Color
+import dev.kord.common.entity.Snowflake
+import dev.kord.core.behavior.getChannelOf
 import dev.kord.core.behavior.interaction.response.respond
+import dev.kord.core.entity.channel.VoiceChannel
 import dev.kord.core.event.interaction.ButtonInteractionCreateEvent
+import dev.kord.core.event.user.VoiceStateUpdateEvent
 import dev.kord.core.on
 import dev.kord.rest.builder.message.embed
 import dev.schlaubi.lavakord.LavaKord
+import dev.schlaubi.lavakord.audio.Link
+import dev.schlaubi.lavakord.kord.getLink
 import dev.schlaubi.lavakord.kord.lavakord
+import kotlinx.coroutines.flow.count
 import net.moonleay.botendo.data.CredentialManager
 import net.moonleay.botendo.extensions.music.*
+import net.moonleay.botendo.extensions.music.components.MusicManager
 import net.moonleay.botendo.extensions.util.InfoExtension
 import net.moonleay.botendo.util.Logger
 import net.moonleay.botendo.util.MessageUtil
-import net.moonleay.botendo.util.UserUtil
 
 object Bot {
     //The kord object gets set at app launch
@@ -69,7 +76,7 @@ object Bot {
             }
 
             this.presence {
-                this.streaming("music", "https://twitch.tv/limited_dev")
+                this.streaming("music", "https://twitch.tv/moonleaytv")
             }
         }
 
@@ -91,6 +98,7 @@ object Bot {
                 b.onInteraction(response, g, u)
                 return@on
             }
+            // Button not found
             response.respond {
                 this.embed {
                     this.color = Color(0xE0311A)
@@ -103,6 +111,34 @@ object Bot {
             }
         }
 
+        // Allow the bot to leave the VC if there are no users in the VC
+        bot.kordRef.on<VoiceStateUpdateEvent> {
+            if (this.state.userId == bot.kordRef.selfId) {
+                // Ignore self
+                return@on
+            }
+            val g = this.state.getGuild().asGuild()
+            val link = lava.getLink(g.id)
+            if (link.state != Link.State.CONNECTED) {
+                // Ignore if not connected
+                return@on
+            }
+            val myChannel = link.lastChannelId!!
+            if (g.getChannelOrNull(Snowflake(myChannel)) == null) {
+                // Ignore if channel cannot be found
+                return@on
+            }
+            val ch = g.getChannelOf<VoiceChannel>(Snowflake(myChannel))
+            if (ch.voiceStates.count() > 1) {
+                // Ignore if there are other users in the channel
+                return@on
+            }
+            // Stop playing if there are no users in the channel
+            val pl = MusicManager.getMusicManager(g)!!.pl
+            pl.stopTrack()
+            link.destroy()
+        }
+
         //Start the bot
         bot.start()
     }

src/main/kotlin/net/moonleay/botendo/extensions/music/PlayExtension.kt

@@ -25,6 +25,7 @@ import dev.kord.common.Color
 import dev.kord.rest.builder.message.embed
 import dev.schlaubi.lavakord.audio.Link
 import dev.schlaubi.lavakord.kord.getLink
+import net.moonleay.botendo.Bot
 import net.moonleay.botendo.extensions.music.components.LinkArguments
 import net.moonleay.botendo.extensions.music.components.MusicManager
 import net.moonleay.botendo.util.MessageUtil
@@ -41,7 +42,7 @@ class PlayExtension : Extension() {
             description = "Play music"
             this.action {
                 val guildId = this.guild!!.id
-                val link = net.moonleay.botendo.Bot.lava.getLink(guildId)
+                val link = Bot.lava.getLink(guildId)
                 val u = this.user
                 val vcsUser = u.asMember(guildId).getVoiceStateOrNull()
                 if (vcsUser == null) {

src/main/kotlin/net/moonleay/botendo/extensions/music/components/MusicManager.kt

@@ -36,6 +36,10 @@ import net.moonleay.botendo.util.*
 object MusicManager {
     private var musicManagerMap: MutableMap<Snowflake, GuildTrackScheduler> = mutableMapOf()
 
+    fun getMusicManager(guild: Guild): GuildTrackScheduler? {
+        return musicManagerMap[guild.id]
+    }
+
     fun getGuildTrackScheduler(guild: Guild, player: Player): GuildTrackScheduler {
         return musicManagerMap.computeIfAbsent(guild.id) {
             GuildTrackScheduler(player)
@@ -181,6 +185,10 @@ object MusicManager {
 
             }
             is LoadResult.NoMatches -> {
+                if(gts.isEmpty()) {
+                    player.stopTrack()
+                    link.destroy()
+                }
                 if (!silent)
                     ctx.respond {
                         this.embed {
@@ -194,6 +202,10 @@ object MusicManager {
                     }
             }
             is LoadResult.LoadFailed -> {
+                if (gts.isEmpty()) {
+                    player.stopTrack()
+                    link.destroy()
+                }
                 if (!silent)
                     ctx.respond {
                         this.embed {