Chords/src/main/java/moe/nekojimi/chords/commands/JoinCommand.java

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package moe.nekojimi.chords.commands;

import java.util.List;
import moe.nekojimi.chords.Chords;
import net.dv8tion.jda.api.entities.*;
import net.dv8tion.jda.api.entities.channel.concrete.VoiceChannel;
import net.dv8tion.jda.api.entities.channel.middleman.MessageChannel;
import net.dv8tion.jda.api.events.message.MessageReceivedEvent;

public class JoinCommand extends Command
{

    public JoinCommand(Chords bot)
    {
        super(bot, "join");
    }

    @Override
    public void call(Invocation invocation)
    {
        MessageReceivedEvent event = invocation.getEvent();
        List<String> args = invocation.getArgs();
        MessageChannel textChannel = event.getChannel();
        VoiceChannel channel = null;
        if (args.isEmpty() || args.get(0).isBlank())
        {
            final Member member = event.getMessage().getMember();
            if (member != null)
            {
                GuildVoiceState voiceState = member.getVoiceState();
                if (voiceState != null && voiceState.inAudioChannel())
                    channel = voiceState.getChannel().asVoiceChannel();
            }
            if (channel == null)
            {
                Guild guild = event.getMessage().getGuild();
                List<VoiceChannel> voiceChannels = guild.getVoiceChannels();
                System.out.println("Finding channel to join...");
                for (VoiceChannel voiceChannel : voiceChannels)
                {
                    List<Member> members = voiceChannel.getMembers();
                    if (!members.isEmpty())
                        channel = voiceChannel;
                    System.out.println("\t" + voiceChannel.getName() + " " + members.size());
                }
            }
            if (channel == null)
                throw new RuntimeException("Cannot find any voice channels with people in!");
        } else
        {
            String arg0 = args.get(0);
            Guild guild = event.getGuild();
            boolean isNumber = arg0.matches("\\d+"); // This is a regular expression that ensures the input consists of digits
            if (isNumber) // The input is an id?
                channel = guild.getVoiceChannelById(arg0);
            if (channel == null)                    // Then the input must be a name?
            {
                List<VoiceChannel> channels = guild.getVoiceChannelsByName(arg0, true);
                if (!channels.isEmpty())            // Make sure we found at least one exact match
                    channel = channels.get(0);      // We found a channel! This cannot be null.
            }

            if (channel == null)                    // I have no idea what you want mr user
            {
                onUnknownChannel(textChannel, arg0); // Let the user know about our failure
                return;
            }

        }
        bot.connectTo(channel);                     // We found a channel to connect to!
        onConnecting(channel, textChannel);     // Let the user know, we were successful!
    }

    /**
     * Inform user about successful connection.
     *
     * @param channel
     * The voice channel we connected to
     * @param textChannel
     * The text channel to send the message in
     */
    public void onConnecting(VoiceChannel channel, MessageChannel textChannel)
    {
        textChannel.sendMessage("Connecting to " + channel.getName()).queue(); // never forget to queue()!
    }

    /**
     * The channel to connect to is not known to us.
     *
     * @param channel
     * The message channel (text channel abstraction) to send failure
     * information to
     * @param comment
     * The information of this channel
     */
    public void onUnknownChannel(MessageChannel channel, String comment)
    {
        channel.sendMessage("Unable to connect to ``" + comment + "``, no such channel!").queue(); // never forget to queue()!
    }

}