discord-music-bot/src/commands/join.ts

import {
    SlashCommandBuilder,
    PermissionFlagsBits,
    ChannelType,
    ChatInputCommandInteraction, // Import the specific interaction type
    GuildMember, // Import GuildMember type
    VoiceBasedChannel // Import VoiceBasedChannel type
} from 'discord.js';
import logger from '../utils/logger'; // Use default import
import { BotClient } from '../index'; // Import the BotClient interface
import { Player } from 'shoukaku'; // Import the Player type explicitly

export default { // Use export default for ES Modules
    data: new SlashCommandBuilder()
        .setName('join')
        .setDescription('Joins your current voice channel'),
    async execute(interaction: ChatInputCommandInteraction, client: BotClient) { // Add types
        // Ensure command is run in a guild
        if (!interaction.guildId || !interaction.guild || !interaction.channelId) {
            // Reply might fail if interaction is already replied/deferred, use editReply if needed
            return interaction.reply({ content: 'This command can only be used in a server.', ephemeral: true }).catch(() => {});
        }
        // Ensure interaction.member is a GuildMember
        if (!(interaction.member instanceof GuildMember)) {
             return interaction.reply({ content: 'Could not determine your voice channel.', ephemeral: true }).catch(() => {});
        }

        // Use ephemeral deferral
        await interaction.deferReply({ ephemeral: true });

        const member = interaction.member; // Already checked it's GuildMember
        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!');
        }

        // Type assertion for voiceChannel after check
        const currentVoiceChannel = voiceChannel as VoiceBasedChannel;

        // 2. Check bot permissions
        const permissions = currentVoiceChannel.permissionsFor(client.user!); // Use non-null assertion for client.user
        if (!permissions?.has(PermissionFlagsBits.Connect)) { // Optional chaining for permissions
            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.)
        if (currentVoiceChannel.type !== ChannelType.GuildVoice) {
             return interaction.editReply('I can only join standard voice channels.');
        }

        // Get the initialized Shoukaku instance from the client object
        const shoukaku = client.shoukaku;
        if (!shoukaku) {
            logger.error('Shoukaku instance not found on client object!');
            return interaction.editReply('The music player is not ready yet. Please try again shortly.');
        }

        // 3. Get or create the player and connect using Shoukaku
        // Correctly get player from the players map and type it
        let player: Player | undefined = shoukaku.players.get(interaction.guildId);

        if (!player) {
            try {
                // Create player using the Shoukaku manager
                player = await shoukaku.joinVoiceChannel({
                    guildId: interaction.guildId,
                    channelId: currentVoiceChannel.id,
                    shardId: interaction.guild.shardId, // Get shardId from guild
                });

                logger.info(`Created player and connected to voice channel ${currentVoiceChannel.name} (${currentVoiceChannel.id}) in guild ${interaction.guild.name} (${interaction.guildId})`);
                await interaction.editReply(`Joined ${currentVoiceChannel.name}! Ready to play music.`);

            } catch (error: unknown) { // Type error as unknown
                const errorMessage = error instanceof Error ? error.message : String(error);
                logger.error(`Failed to create/connect player for guild ${interaction.guildId}: ${errorMessage}`, error);
                // Attempt to leave voice channel if connection failed partially
                shoukaku.leaveVoiceChannel(interaction.guildId).catch((e: unknown) => { // Type catch error
                    const leaveErrorMsg = e instanceof Error ? e.message : String(e);
                    logger.error(`Error leaving VC after failed join: ${leaveErrorMsg}`);
                });
                return interaction.editReply('An error occurred while trying to join the voice channel.');
            }
        } else {
            // If player exists, get the corresponding connection
            const connection = shoukaku.connections.get(interaction.guildId);

            // Check if connection exists and if it's in a different channel
            if (!connection || connection.channelId !== currentVoiceChannel.id) {
                try {
                    // Rejoining should handle moving the bot
                    // Note: joinVoiceChannel might implicitly destroy the old player/connection if one exists for the guild.
                    // If issues arise, explicitly call leaveVoiceChannel first.
                    player = await shoukaku.joinVoiceChannel({
                        guildId: interaction.guildId,
                        channelId: currentVoiceChannel.id,
                        shardId: interaction.guild.shardId,
                    });

                    logger.info(`Moved player to voice channel ${currentVoiceChannel.name} (${currentVoiceChannel.id}) in guild ${interaction.guildId}`);
                    await interaction.editReply(`Moved to ${currentVoiceChannel.name}!`);
                } catch (error: unknown) { // Type error as unknown
                    const errorMessage = error instanceof Error ? error.message : String(error);
                    logger.error(`Failed to move player for guild ${interaction.guildId}: ${errorMessage}`, error);
                    return interaction.editReply('An error occurred while trying to move to the voice channel.');
                }
            } else {
                 // Already in the correct channel
                 await interaction.editReply(`I'm already in ${currentVoiceChannel.name}!`);
            }
             // Example of updating a manually managed text channel context (if needed)
             // if (player.textChannelId !== interaction.channelId) {
             //    player.textChannelId = interaction.channelId;
             //    logger.debug(`Updated player text channel context to ${interaction.channel?.name} (${interaction.channelId}) in guild ${interaction.guildId}`);
             // }
        }
    },
};