waffle/src/impl.ts

import { query } from "./database";
import { dispatch } from "./gateway";
import { GatewayPayloadType } from "./gateway/gatewaypayloadtype";

export default async function sendMessage(user: User, channelId: number, optimisticId: number | null, content: string, nickUsername: string | null) {
    const authorId = user.id;
    const createdAt = Date.now().toString();

    const result = await query("INSERT INTO messages(content, channel_id, author_id, created_at, nick_username) VALUES ($1, $2, $3, $4, $5) RETURNING id", [content, channelId, authorId, createdAt, nickUsername]);
    if (!result || result.rowCount < 1) {
        return null;
    }

    let returnObject: any = {
        id: result.rows[0].id,
        content,
        channel_id: channelId,
        author_id: authorId,
        author_username: user.username,
        author_avatar: user.avatar,
        created_at: createdAt,
        nick_username: nickUsername
    };

    dispatch(`channel:${channelId}`, (ws) => {
        let payload: any = returnObject;
        if (ws && ws.state && ws.state.user && ws.state.user.id === user.id && optimisticId) {
            payload = {
                ...payload,
                optimistic_id: optimisticId
            }
            returnObject = {
                ...returnObject,
                optimistic_id: optimisticId
            };
        }
        return {
            t: GatewayPayloadType.MessageCreate,
            d: payload
        };
    });

    return returnObject;
}