DiscordCommand.java

package com.denizenscript.ddiscordbot;

import com.denizenscript.ddiscordbot.objects.DiscordChannelTag;
import com.denizenscript.ddiscordbot.objects.DiscordGroupTag;
import com.denizenscript.ddiscordbot.objects.DiscordRoleTag;
import com.denizenscript.ddiscordbot.objects.DiscordUserTag;
import com.denizenscript.denizencore.objects.Argument;
import discord4j.core.DiscordClient;
import discord4j.core.DiscordClientBuilder;
import discord4j.core.object.entity.Message;
import discord4j.core.object.entity.TextChannel;
import discord4j.core.object.entity.User;
import discord4j.core.object.presence.Activity;
import discord4j.core.object.presence.Presence;
import discord4j.core.object.util.Snowflake;
import com.denizenscript.denizencore.utilities.debugging.Debug;
import com.denizenscript.denizencore.exceptions.InvalidArgumentsException;
import com.denizenscript.denizencore.objects.core.ElementTag;
import com.denizenscript.denizencore.scripts.ScriptEntry;
import com.denizenscript.denizencore.scripts.commands.AbstractCommand;
import com.denizenscript.denizencore.scripts.commands.Holdable;
import com.denizenscript.denizencore.scripts.queues.ScriptQueue;
import com.denizenscript.denizencore.utilities.CoreUtilities;
import org.bukkit.Bukkit;
import reactor.core.publisher.Mono;

import java.util.function.BiFunction;
import java.util.function.Supplier;
import java.util.function.Function;

public class DiscordCommand extends AbstractCommand implements Holdable {

    // <--[command]
    // @Name discord
    // @Syntax discord [id:<id>] [connect code:<botcode>/disconnect/message/add_role/start_typing/stop_typing/remove_role/status (status:<status>) (activity:<activity>)/rename/edit_message/delete_message] (<message>) (message_id:<id>) (channel:<channel>) (user:<user>) (group:<group>) (role:<role>) (url:<url>)
    // @Required 2
    // @Short Connects to and interacts with Discord.
    // @Plugin dDiscordBot
    // @Group external
    //
    // @Description
    // Connects to and interacts with Discord.
    //
    // Commands may fail if the bot does not have permission within the Discord group to perform them.
    //
    // When setting the status of the Discord bot, the status argument can be: ONLINE, DND, IDLE, or INVISIBLE,
    // and the activity argument can be: PLAYING, STREAMING, LISTENING, or WATCHING.
    // Streaming activity requires a 'url:' input.
    //
    // The command may be ~waited for, but only for 'connect' and 'message' options. No other arguments should be ~waited for.
    //
    // @Tags
    // <discord[<bot_id>]>
    // <entry[saveName].message_id> returns the ID of the sent message, when the command is ~waited for, and the 'message' argument is used.
    //
    // @Usage
    // Use to connect to Discord via a bot code.
    // - ~discord id:mybot connect code:<[code]>
    //
    // @Usage
    // Use to disconnect from Discord.
    // - discord id:mybot disconnect
    //
    // @Usage
    // Use to message a Discord channel.
    // - discord id:mybot message channel:<discord[mybot].group[Denizen].channel[bot-spam]> "Hello world!"
    //
    // @Usage
    // Use to message a Discord channel and record the ID.
    // - ~discord id:mybot message channel:<discord[mybot].group[Denizen].channel[bot-spam]> "Hello world!" save:sent
    // - announce "Sent as <entry[sent].message_id>"
    //
    // @Usage
    // Use to send a message to a user through a private channel.
    // - discord id:mybot message user:<[user]> "Hello world!"
    //
    // @Usage
    // Use to add a role on a user in a Discord guild.
    // - discord id:mybot add_role user:<[user]> role:<[role]> group:<[group]>
    //
    // @Usage
    // Use to remove a role on a user in a Discord guild.
    // - discord id:mybot remove_role user:<[user]> role:<[role]> group:<[group]>
    //
    // @Usage
    // Use to set the online status of the bot, and clear the game status.
    // - discord id:mybot status "Minecraft" "status:ONLINE"
    //
    // @Usage
    // Use to set the game status of the bot.
    // - discord id:mybot status "Minecraft" "status:ONLINE" "activity:PLAYING"
    //
    // @Usage
    // Use to change the bot's nickname.
    // - discord id:mybot rename "<[nickname]>" group:<[group]>
    //
    // @Usage
    // Use to give a user a new nickname.
    // - discord id:mybot rename "<[nickname]>" user:<[user]> group:<[group]>
    //
    // @Usage
    // Use to start typing in a specific channel.
    // - discord id:mybot start_typing channel:<[channel]>
    //
    // @Usage
    // Use to stop typing in a specific channel.
    // - discord id:mybot stop_typing channel:<[channel]>
    //
    // @Usage
    // Use to edit a message the bot has already sent.
    // - discord id:mybot edit_message channel:<[channel]> message_id:<[msg]> "Wow! It got edited!"
    //
    // @Usage
    // Use to delete a message the bot has already sent.
    // - discord id:mybot delete_message channel:<[channel]> message_id:<[msg]>
    //
    // -->

    public enum DiscordInstruction { CONNECT, DISCONNECT, MESSAGE, ADD_ROLE, REMOVE_ROLE, STATUS, RENAME, START_TYPING, STOP_TYPING, EDIT_MESSAGE, DELETE_MESSAGE }

    @Override
    public void parseArgs(ScriptEntry scriptEntry) throws InvalidArgumentsException {
        // Interpret arguments
        for (Argument arg : scriptEntry.getProcessedArgs()) {

            if (!scriptEntry.hasObject("id")
                    && arg.matchesPrefix("id")) {
                scriptEntry.addObject("id", new ElementTag(CoreUtilities.toLowerCase(arg.getValue())));
            }
            else if (!scriptEntry.hasObject("instruction")
                    && arg.matchesEnum(DiscordInstruction.values())) {
                scriptEntry.addObject("instruction", arg.asElement());
            }
            else if (!scriptEntry.hasObject("code")
                    && arg.matchesPrefix("code")) {
                scriptEntry.addObject("code", arg.asElement());
            }
            else if (!scriptEntry.hasObject("channel")
                    && arg.matchesPrefix("channel")
                    && arg.matchesArgumentType(DiscordChannelTag.class)) {
                scriptEntry.addObject("channel", arg.asType(DiscordChannelTag.class));
            }
            else if (!scriptEntry.hasObject("url")
                    && arg.matchesPrefix("url")) {
                scriptEntry.addObject("url", arg.asElement());
            }
            else if (!scriptEntry.hasObject("user")
                    && arg.matchesPrefix("user")
                    && arg.matchesArgumentType(DiscordUserTag.class)) {
                scriptEntry.addObject("user", arg.asType(DiscordUserTag.class));
            }
            else if (!scriptEntry.hasObject("group")
                    && arg.matchesPrefix("group")
                    && arg.matchesArgumentType(DiscordGroupTag.class)) {
                scriptEntry.addObject("group", arg.asType(DiscordGroupTag.class));
            }
            else if (!scriptEntry.hasObject("role")
                    && arg.matchesPrefix("role")
                    && arg.matchesArgumentType(DiscordRoleTag.class)) {
                scriptEntry.addObject("role", arg.asType(DiscordRoleTag.class));
            }
            else if (!scriptEntry.hasObject("status")
                    && arg.matchesPrefix("status")) {
                scriptEntry.addObject("status", arg.asElement());
            }
            else if (!scriptEntry.hasObject("activity")
                    && arg.matchesPrefix("activity")) {
                scriptEntry.addObject("activity", arg.asElement());
            }
            else if (!scriptEntry.hasObject("message_id")
                    && arg.matchesPrefix("message_id")) {
                scriptEntry.addObject("message_id", arg.asElement());
            }
            else if (!scriptEntry.hasObject("message")) {
                scriptEntry.addObject("message", new ElementTag(arg.raw_value));
            }
            else {
                arg.reportUnhandled();
            }
        }

        // Check for required information
        if (!scriptEntry.hasObject("id")) {
            throw new InvalidArgumentsException("Must have an ID!");
        }

        // Check for required information
        if (!scriptEntry.hasObject("instruction")) {
            throw new InvalidArgumentsException("Must have an instruction!");
        }
    }

    public static class DiscordConnectThread extends Thread {

        public String code;

        public DiscordConnection conn;

        public Runnable ender;

        @Override
        public void run() {
            try {
                DiscordClient client = new DiscordClientBuilder(code).build();
                conn.client = client;
                conn.registerHandlers();
                client.login().block();
            }
            catch (Exception ex) {
                Bukkit.getScheduler().runTask(DenizenDiscordBot.instance, () -> {
                    DenizenDiscordBot.instance.connections.remove(conn.botID);
                });
                Debug.echoError(ex);
            }
            Bukkit.getScheduler().runTask(DenizenDiscordBot.instance, ender);
        }
    }

    public static void errorMessage(ScriptQueue queue, String message) {
        Bukkit.getScheduler().scheduleSyncDelayedTask(DenizenDiscordBot.instance, new Runnable() {
            @Override
            public void run() {
                Debug.echoError(queue, message);
            }
        }, 0);
    }

    @Override
    public void execute(ScriptEntry scriptEntry) {

        // Fetch required objects
        ElementTag id = scriptEntry.getElement("id");
        ElementTag instruction = scriptEntry.getElement("instruction");
        ElementTag code = scriptEntry.getElement("code"); // Intentionally do not debug this value.
        DiscordChannelTag channel = scriptEntry.getObjectTag("channel");
        ElementTag message = scriptEntry.getElement("message");
        ElementTag status = scriptEntry.getElement("status");
        ElementTag activity = scriptEntry.getElement("activity");
        DiscordUserTag user = scriptEntry.getObjectTag("user");
        DiscordGroupTag guild = scriptEntry.getObjectTag("group");
        DiscordRoleTag role = scriptEntry.getObjectTag("role");
        ElementTag url = scriptEntry.getElement("url");
        ElementTag messageId = scriptEntry.getElement("message_id");

        // Debug the execution
        Debug.report(scriptEntry, getName(), id.debug()
                + (channel != null ? channel.debug(): "")
                + instruction.debug()
                + (message != null ? message.debug(): "")
                + (user != null ? user.debug(): "")
                + (guild != null ? guild.debug(): "")
                + (role != null ? role.debug(): "")
                + (status != null ? status.debug(): "")
                + (activity != null ? activity.debug(): "")
                + (url != null ? url.debug(): "")
                + (messageId != null ? messageId.debug(): ""));

        DiscordClient client;

        Supplier<Boolean> requireClientID = () -> {
            if (!DenizenDiscordBot.instance.connections.containsKey(id.asString())) {
                Debug.echoError(scriptEntry.getResidingQueue(), "Failed to process Discord " + instruction.asString() + " command: unknown ID!");
                return true;
            }
            return false;
        };
        Function<DiscordClient, Boolean> requireClientObject = (_client) -> {
            if (_client == null) {
                Debug.echoError(scriptEntry.getResidingQueue(), "The Discord bot '" + id.asString() + "'is not yet loaded.");
                return true;
            }
            return false;
        };
        BiFunction<Object, String, Boolean> requireObject = (obj, name) -> {
            if (obj == null) {
                Debug.echoError(scriptEntry.getResidingQueue(), "Failed to process Discord " + instruction.asString() + " command: no " + name + " given!");
                return true;
            }
            return false;
        };
        Supplier<Boolean> requireUser = () -> requireObject.apply(user, "user");
        Supplier<Boolean> requireChannel = () -> requireObject.apply(channel, "channel");
        Supplier<Boolean> requireMessage = () -> requireObject.apply(message, "message");
        Supplier<Boolean> requireGuild = () -> requireObject.apply(guild, "guild");
        Supplier<Boolean> requireRole = () -> requireObject.apply(role, "role");
        Supplier<Boolean> requireMessageId = () -> requireObject.apply(messageId, "message_id");
        switch (DiscordInstruction.valueOf(instruction.asString().toUpperCase())) {
            case CONNECT: {
                if (requireObject.apply(code, "code")) {
                    return;
                }
                if (DenizenDiscordBot.instance.connections.containsKey(id.asString())) {
                    Debug.echoError(scriptEntry.getResidingQueue(), "Failed to connect: duplicate ID!");
                    return;
                }
                DiscordConnection dc = new DiscordConnection();
                dc.botID = id.asString();
                DenizenDiscordBot.instance.connections.put(id.asString(), dc);
                DiscordConnectThread dct = new DiscordConnectThread();
                dct.code = code.asString();
                dct.conn = dc;
                dct.ender = () -> scriptEntry.setFinished(true);
                dct.start();
                break;
            }
            case DISCONNECT: {
                scriptEntry.setFinished(true);
                if (requireClientID.get()) {
                    return;
                }
                DenizenDiscordBot.instance.connections.remove(id.asString()).client.logout().block();
                break;
            }
            case MESSAGE: {
                if (channel == null && user == null) {
                    if (!requireChannel.get()) {
                        requireUser.get();
                    }
                    scriptEntry.setFinished(true);
                    return;
                }
                if (requireClientID.get() || requireMessage.get()) {
                    scriptEntry.setFinished(true);
                    return;
                }
                client = DenizenDiscordBot.instance.connections.get(id.asString()).client;
                if (client == null) {
                    return;
                }
                if (channel == null) {
                    client.getUserById(Snowflake.of(user.user_id)).map(User::getPrivateChannel).flatMap(chanBork -> chanBork.flatMap(
                            chan -> chan.createMessage(message.asString())))
                            .map(m -> {
                                scriptEntry.addObject("message_id", new ElementTag(m.getId().asString()));
                                scriptEntry.setFinished(true);
                                return m;
                            })
                            .doOnError(Debug::echoError).subscribe();
                }
                else {
                    client.getChannelById(Snowflake.of(channel.channel_id))
                            .flatMap(chan -> ((TextChannel) chan).createMessage(message.asString()))
                            .map(m -> {
                                scriptEntry.addObject("message_id", new ElementTag(m.getId().asString()));
                                scriptEntry.setFinished(true);
                                return m;
                            })
                            .doOnError(Debug::echoError).subscribe();
                }
                break;
            }
            case ADD_ROLE: {
                scriptEntry.setFinished(true);
                if (requireClientID.get() || requireUser.get() || requireGuild.get() || requireRole.get()) {
                    return;
                }
                client = DenizenDiscordBot.instance.connections.get(id.asString()).client;
                if (requireClientObject.apply(client)) {
                    return;
                }
                client.getGuildById(Snowflake.of(guild.guild_id)).map(guildObj -> guildObj.getMemberById(Snowflake.of(user.user_id)))
                        .flatMap(memberBork -> memberBork.flatMap(member -> member.addRole(Snowflake.of(role.role_id))))
                        .doOnError(Debug::echoError).subscribe();
                break;
            }
            case REMOVE_ROLE: {
                scriptEntry.setFinished(true);
                if (requireClientID.get() || requireUser.get() || requireRole.get() || requireGuild.get()) {
                    return;
                }
                client = DenizenDiscordBot.instance.connections.get(id.asString()).client;
                if (requireClientObject.apply(client)) {
                    return;
                }
                client.getGuildById(Snowflake.of(guild.guild_id)).map(guildObj -> guildObj.getMemberById(Snowflake.of(user.user_id)))
                        .flatMap(memberBork -> memberBork.flatMap(member -> member.removeRole(Snowflake.of(role.role_id))))
                        .doOnError(Debug::echoError).subscribe();
                break;
            }
            case EDIT_MESSAGE: {
                scriptEntry.setFinished(true);
                if (requireClientID.get() || requireChannel.get() || requireMessage.get() || requireMessageId.get()) {
                    return;
                }
                client = DenizenDiscordBot.instance.connections.get(id.asString()).client;
                if (requireClientObject.apply(client)) {
                    return;
                }
                Message mes = client.getMessageById(Snowflake.of(channel.channel_id), Snowflake.of(messageId.asLong())).block();
                if (mes == null) {
                    // Not an error as this could happen for reasons the script isn't able to account for.
                    Debug.echoDebug(scriptEntry, "Message '" + messageId + "' does not exist.");
                    return;
                }
                mes.edit(m -> m.setContent(message.asString())).doOnError(Debug::echoError).subscribe();
                break;
            }
            case DELETE_MESSAGE: {
                scriptEntry.setFinished(true);
                if (requireClientID.get() || requireChannel.get() || requireMessageId.get()) {
                    return;
                }
                client = DenizenDiscordBot.instance.connections.get(id.asString()).client;
                if (requireClientObject.apply(client)) {
                    return;
                }
                Message mes = client.getMessageById(Snowflake.of(channel.channel_id), Snowflake.of(messageId.asLong())).block();
                if (mes == null) {
                    // Not an error as this could happen for reasons the script isn't able to account for.
                    Debug.echoDebug(scriptEntry, "Message '" + messageId + "' does not exist.");
                    return;
                }
                mes.delete().doOnError(Debug::echoError).subscribe();
                break;
            }
            case START_TYPING: {
                scriptEntry.setFinished(true);
                if (requireClientID.get() || requireChannel.get()) {
                    return;
                }
                client = DenizenDiscordBot.instance.connections.get(id.asString()).client;
                if (requireClientObject.apply(client)) {
                    return;
                }
                client.getChannelById(Snowflake.of(channel.channel_id))
                        .flatMap(chan -> ((TextChannel) chan).type())
                        .doOnError(Debug::echoError).subscribe();
                break;
            }
            case STOP_TYPING: {
                scriptEntry.setFinished(true);
                if (requireClientID.get() || requireChannel.get()) {
                    return;
                }
                client = DenizenDiscordBot.instance.connections.get(id.asString()).client;
                if (requireClientObject.apply(client)) {
                    return;
                }
                client.getChannelById(Snowflake.of(channel.channel_id))
                        .map(chan -> ((TextChannel) chan).typeUntil(Mono.empty()))
                        .doOnError(Debug::echoError).subscribe();
                break;
            }
            case RENAME: {
                scriptEntry.setFinished(true);
                if (requireClientID.get() || requireGuild.get() || requireMessage.get()) {
                    return;
                }
                client = DenizenDiscordBot.instance.connections.get(id.asString()).client;
                if (requireClientObject.apply(client)) {
                    return;
                }
                long userId;
                if (user == null) {
                    userId = client.getSelfId().get().asLong();
                }
                else {
                    userId = user.user_id;
                }
                client.getGuildById(Snowflake.of(guild.guild_id)).map(guildObj -> guildObj.getMemberById(Snowflake.of(userId)))
                        .flatMap(memberBork -> memberBork.flatMap(member -> member.edit(spec -> spec.setNickname(message.asString()))))
                        .doOnError(Debug::echoError).subscribe();
                break;
            }
            case STATUS: {
                scriptEntry.setFinished(true);
                if (requireClientID.get()) {
                    return;
                }
                client = DenizenDiscordBot.instance.connections.get(id.asString()).client;
                if (requireClientObject.apply(client)) {
                    return;
                }
                Activity.Type at = activity == null ? Activity.Type.PLAYING : Activity.Type.valueOf(activity.asString().toUpperCase());
                Activity activityObject;
                if (at == Activity.Type.WATCHING) {
                    activityObject = Activity.watching(message.asString());
                }
                else if (at == Activity.Type.STREAMING) {
                    activityObject = Activity.streaming(message.asString(), url.asString());
                }
                else if (at == Activity.Type.LISTENING) {
                    activityObject = Activity.listening(message.asString());
                }
                else {
                    activityObject = Activity.playing(message.asString());
                }
                String statusLower = status == null ? "online" : CoreUtilities.toLowerCase(status.asString());
                Presence presence;
                if (statusLower.equals("idle")) {
                    presence = Presence.idle(activityObject);
                }
                else if (statusLower.equals("dnd")) {
                    presence = Presence.doNotDisturb(activityObject);
                }
                else if (statusLower.equals("invisible")) {
                    presence = Presence.invisible();
                }
                else {
                    presence = Presence.online(activityObject);
                }
                client.updatePresence(presence).subscribe();
                break;
            }
        }
    }
}