import Lru from 'lru-cache';
import { Collection } from 'mongodb';
import db from '../service/db';

interface OauthMap {
    _id: string, // source openId
    uid: number, // target uid
}

const coll: Collection<OauthMap> = db.collection('oauth');
const cache = new Lru({
    maxAge: 5000,
});

export async function get(_id: string) {
    const res = cache.get(_id);
    if (res !== undefined) return res;
    const doc = await coll.findOne({ _id });
    if (doc) return doc.uid;
    return null;
}

export async function set(_id: string, value: number) {
    cache.set(_id, value);
    const res = await coll.findOneAndUpdate(
        { _id },
        { $set: { value } },
        { upsert: true, returnOriginal: false },
    );
    return res.value.uid;
}

global.Hydro.model.oauth = {
    get,
    set,
};