// NATIVE on-device generation stub. Running a local LLM on device (e.g. via
// llama.rn / MLC's native runtime) is a Phase 5 follow-up; until then the native
// webllm engine reports unavailable so callers transparently fall back to the
// search-only path (or a BYO-key cloud model). It NEVER produces a fake answer.
//
// This module is selected by Metro for native (.native.ts) and is never imported
// by any vitest test.

import type { GenerationEngine } from './engine';

const NOT_AVAILABLE = 'On-device generation is not available on native yet';

export const webllm: GenerationEngine = {
  kind: 'webllm',
  label: 'On-device (Qwen2.5-1.5B)',

  async isAvailable(): Promise<boolean> {
    return false;
  },

  async loadModel(): Promise<void> {
    throw new Error(NOT_AVAILABLE);
  },

  isLoaded(): boolean {
    return false;
  },

  async generate(): Promise<string> {
    throw new Error(NOT_AVAILABLE);
  },
};