/**
 * Shared lazy-init singletons + multer config used by route modules under
 * src/api/. Extracted from the original routes.ts so techniques/media/domain
 * sub-routers can reuse them without each duplicating connection setup.
 */
import multer from 'multer';
import { lazyRedis } from '../shared/redis/connection';
import { MediaService } from '../shared/media/media-service';
import { PersistService, PgSessionAdapter, getPgPool } from '../shared/persistence';
import { SessionStore } from '../shared/redis/session-store';

/** Per-module Redis singleton (label visible in connection metadata). */
export const getRedis = lazyRedis('routes');

/** Multer upload — memory storage, 50MB max. Used by /media/upload + /techniques/analyze-media. */
export const upload = multer({
  storage: multer.memoryStorage(),
  limits: { fileSize: 50 * 1024 * 1024 },
});

let _mediaService: MediaService | null = null;
export function getMediaService(): MediaService {
  if (!_mediaService) _mediaService = new MediaService();
  return _mediaService;
}

let _persistService: PersistService | null = null;
export function getPersistServiceInstance(): PersistService {
  if (!_persistService) {
    const r = getRedis();
    _persistService = new PersistService(
      new SessionStore(r),
      new PgSessionAdapter(getPgPool()),
    );
  }
  return _persistService;
}