/** Native ZIP cache is installed by the WeChat build extension; editor/web use Creator directly. */
export default class ActivityBundleLoader {
    private static runtime(): any { return typeof window !== "undefined" && (window as any).__activityBundles; }
    static beginCycle(): void { const runtime = this.runtime(); if (runtime) runtime.beginCycle(); }
    /** Reserve a coherent dependency set without downloading any bundle. */
    static retainGroup(name: string): () => void {
        const runtime = this.runtime();
        if (runtime) return runtime.retainGroup(name);
        if (cc.sys && cc.sys.platform === cc.sys.WECHAT_GAME) throw new Error("活动分包加载器未初始化，请重新构建小游戏");
        return () => {};
    }
    static prepareGroup(name: string): Promise<void> {
        const runtime = this.runtime();
        if (runtime) return runtime.prepareGroup(name);
        try { this.retainGroup(name)(); return Promise.resolve(); } catch (error) { return Promise.reject(error); }
    }
    static ensureBundle(name: string): Promise<cc.AssetManager.Bundle> {
        const runtime = this.runtime();
        if (runtime) return runtime.ensureBundle(name);
        if (cc.sys && cc.sys.platform === cc.sys.WECHAT_GAME)
            return Promise.reject(new Error("活动分包加载器未初始化，请重新构建小游戏"));
        return new Promise((resolve, reject) => cc.assetManager.loadBundle(name, (error, bundle) => error ? reject(error) : resolve(bundle)));
    }
    static async acquireBundle(name: string): Promise<{ bundle: cc.AssetManager.Bundle; release: () => void }> {
        const runtime = this.runtime();
        return runtime ? runtime.acquireBundle(name) : { bundle: await this.ensureBundle(name), release: () => {} };
    }
}