import { Client } from "https://deno.land/x/mysql/mod.ts";
import config from "./config.json" assert { type: "json" };
import {Maybe} from "./Maybe.ts";

export type WithoutId<T> = Omit<T, "id">;
export interface StoccaTreDbConn {
    query<T>(query: string): Promise<Maybe<T>>;
}
export default async function createNewDbConnection(): Promise<StoccaTreDbConn> {
    const mysqlClient = await new Client().connect({
        hostname: config.hostname,
        username: config.username,
        db: "stocca_tre",
        password: config.password,
    });
    return {
        query: async <T>(query: string): Promise<Maybe<T>> => {
            let errMessage: string;
            try {
                const result = await mysqlClient.query(query);
                return {
                    just: result as T,
                };
            } catch (e: unknown) {
                if (e && typeof (e as { message?: any }).message === "string") {
                    errMessage = (e as { message: string}).message;
                } else {
                    errMessage = "An unknown error occurred in the database.";
                }
            }
            return {
                error: {
                    message: errMessage
                },
            };
        }
    }
}