feat(bot): add NodeJS implementation and deploy script

src/commands/join.js

@@ -0,0 +1,74 @@
+const { SlashCommandBuilder, PermissionFlagsBits, ChannelType } = require('discord.js');
+const logger = require('../utils/logger');
+
+module.exports = {
+    data: new SlashCommandBuilder()
+        .setName('join')
+        .setDescription('Joins your current voice channel'),
+    async execute(interaction, client) { // Added client parameter
+        await interaction.deferReply({ ephemeral: true }); // Defer reply as joining might take time
+
+        const member = interaction.member;
+        const voiceChannel = member?.voice?.channel;
+
+        // 1. Check if user is in a voice channel
+        if (!voiceChannel) {
+            return interaction.editReply('You need to be in a voice channel to use this command!');
+        }
+
+        // 2. Check bot permissions
+        const permissions = voiceChannel.permissionsFor(client.user);
+        if (!permissions.has(PermissionFlagsBits.Connect)) {
+            return interaction.editReply('I need permission to **connect** to your voice channel!');
+        }
+        if (!permissions.has(PermissionFlagsBits.Speak)) {
+            return interaction.editReply('I need permission to **speak** in your voice channel!');
+        }
+        // Ensure it's a voice channel (not stage, etc.) although erela might handle this
+        if (voiceChannel.type !== ChannelType.GuildVoice) {
+             return interaction.editReply('I can only join standard voice channels.');
+        }
+
+        // 3. Create or get the player and connect
+        let player = client.manager.get(interaction.guildId);
+
+        if (!player) {
+            try {
+                player = client.manager.create({
+                    guild: interaction.guildId,
+                    voiceChannel: voiceChannel.id,
+                    textChannel: interaction.channelId, // Store the channel where command was used
+                    selfDeafen: true, // Automatically deafen the bot
+                    // selfMute: false, // Bot starts unmuted
+                });
+                player.connect();
+                logger.info(`Created player and connected to voice channel ${voiceChannel.name} (${voiceChannel.id}) in guild ${interaction.guild.name} (${interaction.guildId})`);
+                await interaction.editReply(`Joined ${voiceChannel.name}! Ready to play music.`);
+
+            } catch (error) {
+                logger.error(`Failed to create/connect player for guild ${interaction.guildId}: ${error.message}`, error);
+                // Try to destroy player if partially created
+                if (player) player.destroy();
+                return interaction.editReply('An error occurred while trying to join the voice channel.');
+            }
+        } else {
+            // If player exists but is not connected or in a different channel
+            if (player.voiceChannel !== voiceChannel.id) {
+                 player.setVoiceChannel(voiceChannel.id);
+                 if (!player.playing && !player.paused && !player.queue.size) {
+                    player.connect(); // Connect if not already playing/paused/queued
+                 }
+                 logger.info(`Moved player to voice channel ${voiceChannel.name} (${voiceChannel.id}) in guild ${interaction.guildId}`);
+                 await interaction.editReply(`Moved to ${voiceChannel.name}!`);
+            } else {
+                 // Already in the correct channel
+                 await interaction.editReply(`I'm already in ${voiceChannel.name}!`);
+            }
+             // Update text channel if needed
+             if (player.textChannel !== interaction.channelId) {
+                player.setTextChannel(interaction.channelId);
+                logger.debug(`Updated player text channel to ${interaction.channel.name} (${interaction.channelId}) in guild ${interaction.guildId}`);
+             }
+        }
+    },
+};