export class AssetStore {
    static #isInternalConstructing = false;
    static #idb = globalThis.indexedDB;

    constructor(db) {
        if (!AssetStore.#isInternalConstructing) {
            throw new TypeError("Gesundheit is not constructable - use Gesundheit.load()");
        }
        AssetStore.#isInternalConstructing = false;

        this.db = db;
    }

    async add(name, mime, bytes) {
        const transaction = this.db.transaction(["asset"], "readwrite");

        return await new Promise((resolve, reject) => {
            transaction.oncomplete = () => {
                resolve();
            };

            transaction.onerror = () => {
                reject();
            };

            const objectStore = transaction.objectStore("asset");

            objectStore.add({ name, mime, bytes });
        });
    }

    static async load(name) {
        /* remove when not developing db */
        this.#idb.deleteDatabase(name);
        const req = this.#idb.open(name);
        const db = await new Promise((resolve, reject) => {
            req.onerror = () => {
                reject(req.error);
            };

            req.onupgradeneeded = () => {
                const db = req.result;

                db.createObjectStore("asset", {
                    keyPath: "name",
                });
            };

            req.onsuccess = () => {
                resolve(req.result);
            };
        });
        this.#isInternalConstructing = true;
        return new AssetStore(db);
    }
}