//@ts-check

const ID = "JadefinIntegrity";

class JadefinIntegrity {
    /** @type {Map<string, {url: string, loaded: any}>} */
    loaded = new Map();

    constructor() {
        this.getOrAdd(ID, import.meta.url, () => this);
    }

    /**
     * @template T
     * @param {string} id
     * @param {string} [url]
     * @param {() => T} [cb]
     * @returns {T}
     */
    getOrAdd(id, url, cb) {
        let entry = this.loaded.get(id);

        if (entry) {
            if (url && url != entry.url) {
                window["Jadefin"].log.w(`INTEGRITY CONFLICT for "${id}", loaded vs requested: \n ${entry.url} \n ${url}`);
            }

        } else if (!url || !cb) {
            throw new Error(`"${id}" not loaded`);

        } else {
            entry = {
                url,
                loaded: cb()
            };

            this.loaded.set(id, entry);
        }

        return entry.loaded;
    }

}

if (window[ID])
{
    window[ID].getOrAdd(ID, import.meta.url, () => null);
}

/** @type {JadefinIntegrity} */
const integrity = window[ID] ??= new JadefinIntegrity();

/** @type {typeof JadefinIntegrity.prototype.getOrAdd} */
export default integrity.getOrAdd.bind(integrity);