require("dotenv").config();
const db = require("./db");
const fs = require("fs").promises;

async function main() {
    let studs = await fs.readFile(__dirname + "/studs.csv", "utf8");
    const users = await db.query("SELECT id, username, name, surname FROM users");
    for (const user of users) {
        studs = studs.replaceAll(`;${user.username};`, `;${user.id};`);
        studs = studs.replaceAll(`${user.username};`, `${user.name} ${user.surname};`);
    }
    await fs.writeFile(__dirname + "/studsfix.csv", studs, "utf8");
    const json = await ssvToObj(studs);
    await fs.writeFile(__dirname + "/progs.json", JSON.stringify(json), "utf8");
    console.log("Finished!");
}

async function ssvToObj(ssv) {
    const obj = {};
    const lines = ssv.split("\n").slice(1, -1);
    for (const line of lines) {
        const [t, u, c] = line.split(";");
        if (obj.hasOwnProperty(u)) obj[u].push(`${c} - ${t}`);
        else obj[u] = [`${c} - ${t}`];
    }
    return obj;
}

main()
    .then(() => process.exit())
    .catch(console.error);