import { Client } from "postgres";
import config from "./config.ts";
import {Maybe} from "./Maybe.ts";
import {JSONObject} from "./JSON.ts";

export type WithoutId<T> = Omit<T, "id">;

export interface StoccaTreDbConn {
    query<T extends JSONObject | JSONObject[]>(query: string): Promise<Maybe<T>>,
}

export default function createNewDbConnection(): StoccaTreDbConn {
    const postgresClient = new Client({
        hostname: config.hostname,
        password: config.password,
        user: config.username,
        database: "stocca_tre",
        port: config.port,
    });
    await postgresClient.connect();
    return {
        async queryMany<T extends JSONObject[]>(query: string): Promise<Maybe<{ rows: T, count: number }>> {
            try {
                const result = await postgresClient.queryArray<T>(query);
                return {
                    just: {
                        rows: result.rows,
                        count: result.rowCount ?? NaN,
                    },
                };
            } catch (e: unknown) {
            }
        },
        queryOne<T extends JSONObject>(query: string): Promise<Maybe<T>> {
            try {
                const result = await postgresClient.queryObject<T>(query);
                return { just: result };
            }
        }
    }
}