import { syncGeneratedPagesFromPublicAssets } from './mindspace-page-sync.mjs';
import { resolvePublishDir } from './user-publish.mjs';

export function createPageSyncService({
  pool,
  pageService,
  assetService,
  h5Root,
  syncWorkspaceAssets = null,
  logger = console,
} = {}) {
  const syncInFlight = new Map();

  async function syncUserGeneratedPages(userId, { onlyRelativePaths = null } = {}) {
    if (!pool || !pageService || !userId) {
      return { created: 0, skipped: 0, updated: 0 };
    }

    const scopeKey = onlyRelativePaths == null
      ? '*'
      : [...new Set(onlyRelativePaths)].sort().join('|');
    const inFlightKey = `${userId}:${scopeKey}`;
    let inFlight = syncInFlight.get(inFlightKey);
    if (!inFlight) {
      inFlight = syncGeneratedPagesFromPublicAssets({
        pool,
        pageService,
        assetService,
        userId,
        publishDir: h5Root ? resolvePublishDir(h5Root, { id: userId }) : null,
        syncWorkspaceAssets,
        onlyRelativePaths,
      })
        .catch((error) => {
          logger.warn?.('[MindSpace] page sync failed:', error?.message ?? error);
          return { created: 0, skipped: 0, updated: 0 };
        })
        .finally(() => {
          if (syncInFlight.get(inFlightKey) === inFlight) {
            syncInFlight.delete(inFlightKey);
          }
        });
      syncInFlight.set(inFlightKey, inFlight);
    }
    return inFlight;
  }

  return { syncUserGeneratedPages };
}