EntityBuilder.java

/*
 *     Copyright 2015-2016 Austin Keener & Michael Ritter
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package net.dv8tion.jda.core.entities;

import net.dv8tion.jda.core.AccountType;
import net.dv8tion.jda.core.JDA;
import net.dv8tion.jda.core.OnlineStatus;
import net.dv8tion.jda.core.Region;
import net.dv8tion.jda.core.entities.MessageEmbed.Provider;
import net.dv8tion.jda.core.entities.MessageEmbed.Thumbnail;
import net.dv8tion.jda.core.entities.impl.*;
import net.dv8tion.jda.core.handle.GuildMembersChunkHandler;
import net.dv8tion.jda.core.handle.ReadyHandler;
import net.dv8tion.jda.core.requests.GuildLock;
import net.dv8tion.jda.core.requests.WebSocketClient;
import org.json.JSONArray;
import org.json.JSONObject;

import java.awt.*;
import java.time.OffsetDateTime;
import java.util.*;
import java.util.List;
import java.util.function.Consumer;
import java.util.regex.Matcher;
import java.util.regex.Pattern;

public class EntityBuilder
{
    public static final String MISSING_CHANNEL = "MISSING_CHANNEL";
    public static final String MISSING_USER = "MISSING_USER";

    private static final HashMap<JDA, EntityBuilder> builders = new HashMap<>();
    private static final Pattern channelMentionPattern = Pattern.compile("<#(\\d+)>");

    protected final JDAImpl api;
    protected final HashMap<String, JSONObject> cachedGuildJsons = new HashMap<>();
    protected final HashMap<String, Consumer<Guild>> cachedGuildCallbacks = new HashMap<>();

    public static EntityBuilder get(JDA api)
    {
        EntityBuilder builder = builders.get(api);
        if (builder == null)
        {
            builder = new EntityBuilder(api);
            builders.put(api, builder);
        }
        return builder;
    }

    private EntityBuilder(JDA api)
    {
        this.api = (JDAImpl) api;
    }

    public SelfInfo createSelfInfo(JSONObject self)
    {
        SelfInfoImpl selfInfo = ((SelfInfoImpl) api.getSelfInfo());
        if (selfInfo == null)
        {
            selfInfo = new SelfInfoImpl(self.getString("id"), api);
            api.setSelfInfo(selfInfo);
        }
        if (!api.getUserMap().containsKey(selfInfo.getId()))
        {
            api.getUserMap().put(selfInfo.getId(), selfInfo);
        }
        return (SelfInfo) selfInfo
                .setVerified(self.getBoolean("verified"))
                .setMfaEnabled(self.getBoolean("mfa_enabled"))
                .setEmail(self.has("email") ? self.getString("email") : null)
                .setName(self.getString("username"))
                .setDiscriminator(self.getString("discriminator"))
                .setAvatarId(self.isNull("avatar") ? null : self.getString("avatar"))
                .setBot(self.has("bot") && self.getBoolean("bot"));
    }

    public void createGuildFirstPass(JSONObject guild, Consumer<Guild> secondPassCallback)
    {
        String id = guild.getString("id");
        GuildImpl guildObj = ((GuildImpl) api.getGuildMap().get(id));
        if (guildObj == null)
        {
            guildObj = new GuildImpl(api, id);
            api.getGuildMap().put(id, guildObj);
        }
        if (guild.has("unavailable") && guild.getBoolean("unavailable"))
        {
            guildObj.setAvailable(false);
            //This is used for when GuildCreateHandler receives a guild that is currently unavailable. During normal READY
            // loading for bots (which unavailable is always true) the secondPassCallback parameter will always
            // be null.
            if (secondPassCallback != null)
                secondPassCallback.accept(guildObj);
            GuildLock.get(api).lock(id);
            return;
        }

        //If we make it to here, the Guild is available. This means 1 of 2 things:
        //Either:
        // 1) This is Guild provided during READY for a Client account
        // 2) This is a Guild received from GuildCreateHandler from a GUILD_CREATE event.
        //      This could be triggered by joining a guild or due to discord finally
        //      providing us with Guild information about a previously unavailable guild.
        //      Whether it was unavailable due to Bot READY unavailability or due to an
        //      outage within discord matters now.
        //
        // Either way, we now have enough information to fill in the general information about the Guild.
        // This does NOT necessarily mean that we have all information to complete the guild.
        // For Client accounts, we will also need to use op 12 (GUILD_SYNC) to get all presences of online users because
        // discord only provides Online users that we have an open PM channel with or are friends with for Client accounts.
        // On larger guilds we will still need to request all users using op 8 (GUILD_MEMBERS_CHUNK).
        //
        // The code below takes the information we -do- have and starts to fill in the Guild. It won't create anything
        // that might rely on Users that we don't have due to needing the GUILD_MEMBERS_CHUNK
        // This includes making VoiceStatus and PermissionOverrides

        guildObj.setAvailable(true)
                .setIconId(guild.isNull("icon") ? null : guild.getString("icon"))
                .setSplashId(guild.isNull("splash") ? null : guild.getString("splash"))
                .setRegion(Region.fromKey(guild.getString("region")))
                .setName(guild.getString("name"))
                .setAfkTimeout(guild.getInt("afk_timeout"))
                .setVerificationLevel(Guild.VerificationLevel.fromKey(guild.getInt("verification_level")))
                .setDefaultNotificationLevel(Guild.NotificationLevel.fromKey(guild.getInt("default_message_notifications")))
                .setRequiredMFALevel(Guild.MFALevel.fromKey(guild.getInt("mfa_level")));

        JSONArray roles = guild.getJSONArray("roles");
        for (int i = 0; i < roles.length(); i++)
        {
            Role role = createRole(roles.getJSONObject(i), guildObj.getId());
            guildObj.getRolesMap().put(role.getId(), role);
            if (role.getId().equals(guildObj.getId()))
                guildObj.setPublicRole(role);
        }

        if (guild.has("members"))
        {
            JSONArray members = guild.getJSONArray("members");
            createGuildMemberPass(guildObj, members);
        }

        //This could be null for Client accounts. Will be fixed by GUILD_SYNC
        Member owner = guildObj.getMemberById(guild.getString("owner_id"));
        if (owner != null)
            guildObj.setOwner(owner);

        if (guild.has("presences"))
        {
            JSONArray presences = guild.getJSONArray("presences");
            for (int i = 0; i < presences.length(); i++)
            {
                JSONObject presence = presences.getJSONObject(i);
                MemberImpl member = (MemberImpl) guildObj.getMembersMap().get(presence.getJSONObject("user").getString("id"));
//                if (member == null)
//                {
//                    //corresponding user to presence not found... ignoring
//                    continue;
//                }
                if (member == null)
                    WebSocketClient.LOG.fatal("Received a Presence for a non-existent Member when dealing with GuildFirstPass!");
                createPresence(member, presence);
            }
        }

        if (guild.has("channels"))
        {
            JSONArray channels = guild.getJSONArray("channels");

            for (int i = 0; i < channels.length(); i++)
            {
                JSONObject channel = channels.getJSONObject(i);
                ChannelType type = ChannelType.fromId(channel.getInt("type"));
                if (type == ChannelType.TEXT)
                {
                    TextChannel newChannel = createTextChannel(channel, guildObj.getId());
                    if (newChannel.getId().equals(guildObj.getId()))
                        guildObj.setPublicChannel(newChannel);
                }
                else if (type == ChannelType.VOICE)
                {
                    VoiceChannel newChannel = createVoiceChannel(channel, guildObj.getId());
                    if (!guild.isNull("afk_channel_id")
                            && newChannel.getId().equals(guild.getString("afk_channel_id")))
                        guildObj.setAfkChannel(newChannel);
                }
                else
                    WebSocketClient.LOG.fatal("Received a channel for a guild that isn't a text or voice channel. JSON: " + channel);
            }
        }

        //If the members that we were provided with (and loaded above) were not all of the
        //  the members in this guild, then we need to request more users from Discord using
        //  op 9 (GUILD_MEMBERS_CHUNK). To do so, we will cache the guild's JSON so we can properly
        //  load stuff that relies on Users like Channels, PermissionOverrides and VoiceStatuses
        //  after we have the rest of the users. We will request the GUILD_MEMBERS_CHUNK information
        //  which will be sent from discord over the main Websocket and will be handled by
        //  GuildMemberChunkHandler. After the handler has received all users as determined by the
        //  value set using `setExpectedGuildMembers`, it will do one of the following:
        //    1) If this is a Bot account, immediately call EntityBuilder#createGuildSecondPass, thus finishing
        //        the Guild object creation process.
        //    2) If this is a Client account, it will request op 12 (GUILD_SYNC) to make sure we have all information
        //        about online users as GUILD_MEMBERS_CHUNK does not include presence information, and when loading the
        //        members from GUILD_MEMBERS_CHUNK, we assume they are offline. GUILD_SYNC makes sure that we mark them
        //        properly. After GUILD_SYNC is received by GuildSyncHandler, it will call EntityBuilder#createGuildSecondPass
        //
        //If we actually -did- get all of the users needed, then we don't need to Chunk. Furthermore,
        // we don't need to use GUILD_SYNC because we always get presences with users thus we have all information
        // needed to guild the Guild. We will skip
        if (guild.getJSONArray("members").length() != guild.getInt("member_count"))
        {
            cachedGuildJsons.put(id, guild);
            cachedGuildCallbacks.put(id, secondPassCallback);

            GuildMembersChunkHandler handler = api.getClient().getHandler("GUILD_MEMBERS_CHUNK");
            handler.setExpectedGuildMembers(id, guild.getInt("member_count"));

            //If we are already past READY / RESUME, then chunk at runtime. Otherwise, pass back to the ReadyHandler
            // and let it send a burst chunk request.
            if (api.getClient().isReady())
            {
                if (api.getAccountType() == AccountType.CLIENT)
                {
                    JSONObject obj = new JSONObject()
                            .put("op", 12)
                            .put("guild_id", guildObj.getId());
                    api.getClient().send(obj.toString());
                }
                JSONObject obj = new JSONObject()
                        .put("op", 8)
                        .put("d", new JSONObject()
                                .put("guild_id", id)
                                .put("query","")
                                .put("limit", 0)
                        );
                api.getClient().send(obj.toString());
            }
            else
            {
                ReadyHandler readyHandler = api.getClient().getHandler("READY");
                readyHandler.acknowledgeGuild(guildObj, true, true, api.getAccountType() == AccountType.CLIENT);
            }

            GuildLock.get(api).lock(id);
            return;
        }

        //As detailed in the comment above, if we've made it this far then we have all member information needed to
        // create the Guild. Thusly, we fill in the remaining information, unlock the guild, and provide the guild
        // to the callback
        //This should only occur on small user count guilds.

        JSONArray channels = guild.getJSONArray("channels");
        createGuildChannelPass(guildObj, channels); //Actually creates PermissionOverrides

        JSONArray voiceStates = guild.getJSONArray("voice_states");
        createGuildVoiceStatePass(guildObj, voiceStates);

        GuildLock.get(api).unlock(guildObj.getId());
        if (secondPassCallback != null)
            secondPassCallback.accept(guildObj);
    }

    public void createGuildSecondPass(String guildId, List<JSONArray> memberChunks)
    {
        JSONObject guildJson = cachedGuildJsons.remove(guildId);
        Consumer<Guild> secondPassCallback = cachedGuildCallbacks.remove(guildId);
        GuildImpl guildObj = (GuildImpl) api.getGuildMap().get(guildId);

        if (guildObj == null)
            throw new IllegalStateException("Attempted to preform a second pass on an unknown Guild. Guild not in JDA " +
                    "mapping. GuildId: " + guildId);
        if (guildJson == null)
            throw new IllegalStateException("Attempted to preform a second pass on an unknown Guild. No cached Guild " +
                    "for second pass. GuildId: " + guildId);
        if (secondPassCallback == null)
            throw new IllegalArgumentException("No callback provided for the second pass on the Guild!");

        for (JSONArray chunk : memberChunks)
        {
            createGuildMemberPass(guildObj, chunk);
        }

        Member owner = guildObj.getMemberById(guildJson.getString("owner_id"));
        if (owner != null)
            guildObj.setOwner(owner);

        if (guildObj.getOwner() == null)
            WebSocketClient.LOG.fatal("Never set the Owner of the Guild: " + guildObj.getId() + " because we don't have the owner User object! How?!");

        JSONArray channels = guildJson.getJSONArray("channels");
        createGuildChannelPass(guildObj, channels);

        JSONArray voiceStates = guildJson.getJSONArray("voice_states");
        createGuildVoiceStatePass(guildObj, voiceStates);

        secondPassCallback.accept(guildObj);
        GuildLock.get(api).unlock(guildId);
    }

    public void handleGuildSync(GuildImpl guild, JSONArray members, JSONArray presences)
    {
        for (int i = 0; i < members.length(); i++)
        {
            JSONObject memberJson = members.getJSONObject(i);
            Member member = createMember(guild, memberJson);
        }

        for (int i = 0; i < presences.length(); i++)
        {
            JSONObject presenceJson = presences.getJSONObject(i);
            String userId = presenceJson.getJSONObject("user").getString("id");

            MemberImpl member = (MemberImpl) guild.getMembersMap().get(userId);
            if (member == null)
                WebSocketClient.LOG.fatal("Received a Presence for a non-existent Member when dealing with GuildSync!");
            else
                this.createPresence(member, presenceJson);
        }
    }

    private void createGuildMemberPass(GuildImpl guildObj, JSONArray members)
    {
        for (int i = 0; i < members.length(); i++)
        {
            JSONObject memberJson = members.getJSONObject(i);
            Member member = createMember(guildObj, memberJson);
        }
    }

    private void createGuildChannelPass(GuildImpl guildObj, JSONArray channels)
    {
        for (int i = 0; i < channels.length(); i++)
        {
            JSONObject channel = channels.getJSONObject(i);
            ChannelType type = ChannelType.fromId(channel.getInt("type"));
            Channel channelObj = null;
            if (type == ChannelType.TEXT)
            {
                channelObj = api.getTextChannelById(channel.getString("id"));
            }
            else if (type == ChannelType.VOICE)
            {
                channelObj = api.getVoiceChannelById(channel.getString("id"));
            }
            else
                WebSocketClient.LOG.fatal("Received a channel for a guild that isn't a text or voice channel (ChannelPass). JSON: " + channel);

            if (channelObj != null)
            {
                JSONArray permissionOverwrites = channel.getJSONArray("permission_overwrites");
                for (int j = 0; j < permissionOverwrites.length(); j++)
                {
                    try
                    {
                        createPermissionOverride(permissionOverwrites.getJSONObject(j), channelObj);
                    }
                    catch (IllegalArgumentException e)
                    {
                        WebSocketClient.LOG.warn(e.getMessage() + ". Ignoring PermissionOverride.");
                    }
                }
            }
            else
            {
                throw new RuntimeException("Got permission_override for unknown channel with id: " + channel.getString("id"));
            }
        }
    }

    public void createGuildVoiceStatePass(GuildImpl guildObj, JSONArray voiceStates)
    {
        for (int i = 0; i < voiceStates.length(); i++)
        {
            JSONObject voiceStateJson = voiceStates.getJSONObject(i);
            Member member = guildObj.getMembersMap().get(voiceStateJson.getString("user_id"));
            if (member == null)
            {
                WebSocketClient.LOG.fatal("Received a VoiceState for a unknown Member! GuildId: "
                        + guildObj.getId() + " MemberId: " + voiceStateJson.getString("user_id"));
                continue;
            }

            VoiceChannelImpl voiceChannel =
                    (VoiceChannelImpl) guildObj.getVoiceChannelMap().get(voiceStateJson.getString("channel_id"));
            voiceChannel.getConnectedMembersMap().put(member.getUser().getId(), member);

            VoiceStateImpl voiceState = (VoiceStateImpl) member.getVoiceState();
            voiceState.setSelfMuted(voiceStateJson.getBoolean("self_mute"))
                    .setSelfDeafened(voiceStateJson.getBoolean("self_deaf"))
                    .setGuildMuted(voiceStateJson.getBoolean("mute"))
                    .setGuildDeafened(voiceStateJson.getBoolean("deaf"))
                    .setSuppressed(voiceStateJson.getBoolean("suppress"))
                    .setSessionId(voiceStateJson.getString("session_id"))
                    .setConnectedChannel(voiceChannel);
        }
    }

    public User createFakeUser(JSONObject user) { return createUser(user, false); }
    public User createUser(JSONObject user)     { return createUser(user, true); }
    private User createUser(JSONObject user, boolean useCache)
    {
        String id = user.getString("id");
        UserImpl userObj;
        if (useCache)
        {
            userObj = ((UserImpl) api.getUserMap().get(id));

            //If we had a fake user, remove it from the fake mappings, make it non-fake. Place it into the main mapping
            // If it had a PrivateChannel, do the same for it.
            if (userObj == null && api.getFakeUserMap().containsKey(id))
            {
                userObj = (UserImpl) api.getFakeUserMap().remove(id);
                userObj.setFake(false);
                api.getUserMap().put(userObj.getId(), userObj);
                if (userObj.hasPrivateChannel())
                {
                    PrivateChannelImpl priv = (PrivateChannelImpl) userObj.getPrivateChannel();
                    priv.setFake(false);
                    api.getFakePrivateChannelMap().remove(priv.getId());
                    api.getPrivateChannelMap().put(priv.getId(), priv);
                }
            }

            if (userObj == null)
            {
                userObj = new UserImpl(id, api);
                api.getUserMap().put(id, userObj);
            }
        }
        else
            userObj = new UserImpl(id, api);

        return userObj
                .setName(user.getString("username"))
                .setDiscriminator(user.get("discriminator").toString())
                .setAvatarId(user.isNull("avatar") ? null : user.getString("avatar"))
                .setBot(user.has("bot") && user.getBoolean("bot"))
                .setFake(!useCache);
    }

    public Member createMember(GuildImpl guild, JSONObject memberJson)
    {
        User user = createUser(memberJson.getJSONObject("user"));
        MemberImpl member = (MemberImpl) guild.getMember(user);
        if (member == null)
        {
            member = new MemberImpl(guild, user);
            guild.getMembersMap().put(user.getId(), member);
        }

        ((VoiceStateImpl) member.getVoiceState())
            .setGuildMuted(memberJson.getBoolean("mute"))
            .setGuildDeafened(memberJson.getBoolean("deaf"));

        member.setJoinDate(OffsetDateTime.parse(memberJson.getString("joined_at")))
            .setNickname(memberJson.has("nickname") && !memberJson.isNull("nickname")
                ? memberJson.getString("nickname")
                : null);

        JSONArray rolesJson = memberJson.getJSONArray("roles");
        for (int k = 0; k < rolesJson.length(); k++)
        {
            String roleId = rolesJson.getString(k);
            Role r = guild.getRolesMap().get(roleId);
            if (r == null)
            {
                WebSocketClient.LOG.fatal("Received a Member with an unknown Role. MemberId: "
                        + member.getUser().getId() + " GuildId: " + guild.getId() + " roleId: " + roleId);
            }
            else
            {
                member.getRoleSet().add(r);
            }
        }

        return member;
    }

    public void createPresence(MemberImpl member, JSONObject presenceJson)
    {
        JSONObject gameJson = presenceJson.isNull("game") ? null: presenceJson.getJSONObject("game");
        member.setOnlineStatus(OnlineStatus.fromKey(presenceJson.getString("status")));

        if (gameJson != null && !gameJson.isNull("name"))
        {
            String gameName = gameJson.getString("name");
            String url = gameJson.isNull("url")
                    ? null
                    : gameJson.getString("url");
            Game.GameType gameType = gameJson.isNull("type")
                    ? Game.GameType.DEFAULT
                    : Game.GameType.fromKey(gameJson.getInt("type"));

            member.setGame(new GameImpl(gameName, url, gameType));
        }
    }

    public TextChannel createTextChannel(JSONObject json, String guildId)
    {
        String id = json.getString("id");
        TextChannelImpl channel = (TextChannelImpl) api.getTextChannelMap().get(id);
        if (channel == null)
        {
            GuildImpl guild = ((GuildImpl) api.getGuildMap().get(guildId));
            channel = new TextChannelImpl(id, guild);
            guild.getTextChannelsMap().put(id, channel);
            api.getTextChannelMap().put(id, channel);
        }

        return channel
                .setName(json.getString("name"))
                .setTopic(json.isNull("topic") ? "" : json.getString("topic"))
                .setRawPosition(json.getInt("position"));
    }

    public VoiceChannel createVoiceChannel(JSONObject json, String guildId)
    {
        String id = json.getString("id");
        VoiceChannelImpl channel = ((VoiceChannelImpl) api.getVoiceChannelMap().get(id));
        if (channel == null)
        {
            GuildImpl guild = (GuildImpl) api.getGuildMap().get(guildId);
            channel = new VoiceChannelImpl(id, guild);
            guild.getVoiceChannelMap().put(id, channel);
            api.getVoiceChannelMap().put(id, channel);
        }

        return channel
                .setName(json.getString("name"))
                .setRawPosition(json.getInt("position"))
                .setUserLimit(json.getInt("user_limit"))
                .setBitrate(json.getInt("bitrate"));
    }

    public PrivateChannel createPrivateChannel(JSONObject privatechat)
    {
        JSONObject recipient = privatechat.getJSONArray("recipients").getJSONObject(0);
        UserImpl user = ((UserImpl) api.getUserMap().get(recipient.getString("id")));
        if (user == null)
        {   //The API can give us private channels connected to Users that we can no longer communicate with.
            // As such, make a fake user and fake private channel.
            user = (UserImpl) createFakeUser(recipient);
            api.getFakeUserMap().put(user.getId(), user);
        }

        PrivateChannelImpl priv = new PrivateChannelImpl(privatechat.getString("id"), user);
        user.setPrivateChannel(priv);

        if (user.isFake())
        {
            priv.setFake(true);
            api.getFakePrivateChannelMap().put(priv.getId(), priv);
        }
        else
            api.getPrivateChannelMap().put(priv.getId(), priv);
        return priv;
    }

    public Role createRole(JSONObject roleJson, String guildId)
    {
        String id = roleJson.getString("id");
        GuildImpl guild = ((GuildImpl) api.getGuildMap().get(guildId));
        RoleImpl role = ((RoleImpl) guild.getRolesMap().get(id));
        if (role == null)
        {
            role = new RoleImpl(id, guild);
            guild.getRolesMap().put(id, role);
        }
        return role.setName(roleJson.getString("name"))
                .setRawPosition(roleJson.getInt("position"))
                .setRawPermissions(roleJson.getInt("permissions"))
                .setManaged(roleJson.getBoolean("managed"))
                .setHoisted(roleJson.getBoolean("hoist"))
                .setColor(roleJson.getInt("color") != 0 ? new Color(roleJson.getInt("color")) : null)
                .setMentionable(roleJson.has("mentionable") && roleJson.getBoolean("mentionable"));
    }

    public Message createMessage(JSONObject jsonObject)
    {
        String id = jsonObject.getString("id");
        String content = jsonObject.getString("content");
        String channelId = jsonObject.getString("channel_id");
        JSONObject author = jsonObject.getJSONObject("author");
        boolean fromWebhook = jsonObject.has("webhook_id");
        MessageChannel chan = api.getTextChannelById(channelId);
        if (chan == null)
            chan = api.getPrivateChannelById(channelId);
        if (chan == null)
        {
            chan = api.getFakePrivateChannelMap().get(channelId);
            if (chan != null)
            {
                //If message is from a private channel from a different shard, use the information provided to use
                // from the json to update the User info.
                UserImpl user = (UserImpl) ((PrivateChannel) chan).getUser();
                user.setName(author.getString("username"))
                        .setDiscriminator(author.get("discriminator").toString())
                        .setAvatarId(author.isNull("avatar") ? null : author.getString("avatar"))
                        .setBot(author.has("bot") && author.getBoolean("bot"));
            }
        }
        if (chan == null)
            throw new IllegalArgumentException(MISSING_CHANNEL);

        MessageImpl message = new MessageImpl(id, chan, fromWebhook)
                .setContent(content)
                .setTime(OffsetDateTime.parse(jsonObject.getString("timestamp")))
                .setMentionsEveryone(jsonObject.getBoolean("mention_everyone"))
                .setTTS(jsonObject.getBoolean("tts"))
                .setPinned(jsonObject.getBoolean("pinned"));
        if (chan instanceof PrivateChannel)
            message.setAuthor(((PrivateChannel) chan).getUser());
        else
        {
            GuildImpl guild = (GuildImpl) ((TextChannel) chan).getGuild();
            User user = api.getUserMap().get(author.getString("id"));
            if (user != null)
                message.setAuthor(user);
            else if (fromWebhook)
                message.setAuthor(createFakeUser(author));
            else
                throw new IllegalArgumentException(MISSING_USER);
        }

        List<Message.Attachment> attachments = new LinkedList<>();
        JSONArray jsonAttachments = jsonObject.getJSONArray("attachments");
        for (int i = 0; i < jsonAttachments.length(); i++)
        {
            JSONObject jsonAttachment = jsonAttachments.getJSONObject(i);
            attachments.add(new Message.Attachment(
                    jsonAttachment.getString("id"),
                    jsonAttachment.getString("url"),
                    jsonAttachment.getString("proxy_url"),
                    jsonAttachment.getString("filename"),
                    jsonAttachment.getInt("size"),
                    jsonAttachment.has("height") ? jsonAttachment.getInt("height") : 0,
                    jsonAttachment.has("width") ? jsonAttachment.getInt("width") : 0,
                    api
            ));
        }
        message.setAttachments(attachments);

        List<MessageEmbed> embeds = new LinkedList<>();
        JSONArray jsonEmbeds = jsonObject.getJSONArray("embeds");
        for (int i = 0; i < jsonEmbeds.length(); i++)
        {
            embeds.add(createMessageEmbed(jsonEmbeds.getJSONObject(i)));
        }
        message.setEmbeds(embeds);

        if (!jsonObject.isNull("edited_timestamp"))
            message.setEditedTime(OffsetDateTime.parse(jsonObject.getString("edited_timestamp")));

        if (!message.isPrivate())
        {
            TextChannel textChannel = message.getTextChannel();
            TreeMap<Integer, User> mentionedUsers = new TreeMap<>();
            JSONArray mentions = jsonObject.getJSONArray("mentions");
            for (int i = 0; i < mentions.length(); i++)
            {
                JSONObject mention = mentions.getJSONObject(i);
                User u = api.getUserMap().get(mention.getString("id"));
                if (u != null)
                {
                    //We do this to properly order the mentions. The array given by discord is out of order sometimes.
                    int index = content.indexOf("<@" + mention.getString("id") + ">");
                    mentionedUsers.put(index, u);
                }
            }
            message.setMentionedUsers(new LinkedList<User>(mentionedUsers.values()));

            TreeMap<Integer, Role> mentionedRoles = new TreeMap<>();
            JSONArray roleMentions = jsonObject.getJSONArray("mention_roles");
            for (int i = 0; i < roleMentions.length(); i++)
            {
                String roleId = roleMentions.getString(i);
                Role r = textChannel.getGuild().getRoleById(roleId);
                if (r != null)
                {
                    int index = content.indexOf("<@&" + roleId + ">");
                    mentionedRoles.put(index, r);
                }
            }
            message.setMentionedRoles(new LinkedList<Role>(mentionedRoles.values()));

            List<TextChannel> mentionedChannels = new LinkedList<>();
            Map<String, TextChannel> chanMap = ((GuildImpl) textChannel.getGuild()).getTextChannelsMap();
            Matcher matcher = channelMentionPattern.matcher(content);
            while (matcher.find())
            {
                TextChannel channel = chanMap.get(matcher.group(1));
                if(channel != null && !mentionedChannels.contains(channel))
                {
                    mentionedChannels.add(channel);
                }
            }
            message.setMentionedChannels(mentionedChannels);
        }
        return message;
    }

    public MessageEmbed createMessageEmbed(JSONObject messageEmbed)
    {
        MessageEmbedImpl embed = new MessageEmbedImpl()
                .setUrl(messageEmbed.getString("url"))
                .setTitle(messageEmbed.isNull("title") ? null : messageEmbed.getString("title"))
                .setDescription(messageEmbed.isNull("description") ? null : messageEmbed.getString("description"));

        EmbedType type = EmbedType.fromKey(messageEmbed.getString("type"));
//        if (type.equals(EmbedType.UNKNOWN))
//            throw new IllegalArgumentException("Discord provided us an unknown embed type.  Json: " + messageEmbed);
        embed.setType(type);

        if (messageEmbed.has("thumbnail"))
        {
            JSONObject thumbnailJson = messageEmbed.getJSONObject("thumbnail");
            embed.setThumbnail(new Thumbnail(
                    thumbnailJson.getString("url"),
                    thumbnailJson.getString("proxy_url"),
                    thumbnailJson.getInt("width"),
                    thumbnailJson.getInt("height")));
        }
        else embed.setThumbnail(null);

        if (messageEmbed.has("provider"))
        {
            JSONObject providerJson = messageEmbed.getJSONObject("provider");
            embed.setSiteProvider(new Provider(
                    providerJson.isNull("name") ? null : providerJson.getString("name"),
                    providerJson.isNull("url") ? null : providerJson.getString("url")));
        }
        else embed.setSiteProvider(null);

        if (messageEmbed.has("author"))
        {
            JSONObject authorJson = messageEmbed.getJSONObject("author");
            embed.setAuthor(new Provider(
                    authorJson.isNull("name") ? null : authorJson.getString("name"),
                    authorJson.isNull("url") ? null : authorJson.getString("url")));
        }
        else embed.setAuthor(null);

        if (messageEmbed.has("video"))
        {
            JSONObject videoJson = messageEmbed.getJSONObject("video");
            embed.setVideoInfo(new MessageEmbed.VideoInfo(
                    videoJson.getString("url"),
                    videoJson.isNull("width") ? -1 : videoJson.getInt("width"),
                    videoJson.isNull("height") ? -1 : videoJson.getInt("height")));
        }
        return embed;
    }

    public PermissionOverride createPermissionOverride(JSONObject override, Channel chan)
    {
        PermissionOverrideImpl permOverride = null;
        String id = override.getString("id");
        int allow = override.getInt("allow");
        int deny = override.getInt("deny");

        switch (override.getString("type"))
        {
            case "member":
                Member member = chan.getGuild().getMemberById(id);
                if (member == null)
                    throw new IllegalArgumentException("Attempted to create a PermissionOverride for a non-existent user. Guild: " + chan.getGuild() + ", Channel: " + chan + ", JSON: " + override);

                permOverride = (PermissionOverrideImpl) chan.getOverrideForMember(member);
                if (permOverride == null)
                {
                    permOverride = new PermissionOverrideImpl(chan, member, null);
                    if (chan instanceof TextChannel)
                        ((TextChannelImpl) chan).getMemberOverrideMap().put(member, permOverride);
                    else
                        ((VoiceChannelImpl) chan).getMemberOverrideMap().put(member, permOverride);
                }
                break;
            case "role":
                Role role = ((GuildImpl) chan.getGuild()).getRolesMap().get(id);
                if (role == null)
                    throw new IllegalArgumentException("Attempted to create a PermissionOverride for a non-existent role! JSON: " + override);

                permOverride = (PermissionOverrideImpl) chan.getOverrideForRole(role);
                if (permOverride == null)
                {
                    permOverride = new PermissionOverrideImpl(chan, null, role);
                    if (chan instanceof TextChannel)
                        ((TextChannelImpl) chan).getRoleOverrideMap().put(role, permOverride);
                    else
                        ((VoiceChannelImpl) chan).getRoleOverrideMap().put(role, permOverride);
                }
                break;
            default:
                throw new IllegalArgumentException("Provided with an unknown PermissionOverride type! JSON: " + override);
        }
        return permOverride.setAllow(allow)
                .setDeny(deny);
    }

    public void clearCache()
    {
        cachedGuildJsons.clear();
        cachedGuildCallbacks.clear();
    }
}