import { useEffect, useState } from "preact/hooks";
import { searchWorkspaceItems, type WorkspaceItem, type WorkspaceSearchResponse } from "@/lib/api";
import { scheduleWorkspaceSearch } from "@/lib/workspace-search";

type SearchState = WorkspaceSearchResponse & { query: string; revision: number; error: string | null };
const EMPTY_ITEMS: WorkspaceItem[] = [];

export function useWorkspaceSearch(query: string, enabled: boolean, revision: number) {
  const trimmed = query.trim();
  const [state, setState] = useState<SearchState | null>(null);
  const validationError = trimmed.length > 200 ? "Use 200 characters or fewer." : null;

  useEffect(() => {
    setState(null);
    if (!enabled || !trimmed || validationError) return;
    return scheduleWorkspaceSearch(trimmed, searchWorkspaceItems,
      (result) => setState({ ...result, query: trimmed, revision, error: null }),
      (error) => setState({ items: [], hasMore: false, query: trimmed, revision, error: error instanceof Error ? error.message : String(error) })
    );
  }, [trimmed, enabled, revision, validationError]);

  // Hide obsolete results immediately, even before effect cleanup runs.
  const current = enabled && state?.query === trimmed && state.revision === revision ? state : null;
  return {
    items: current?.items ?? EMPTY_ITEMS,
    hasMore: current?.hasMore ?? false,
    error: validationError ?? current?.error ?? null,
    isLoading: enabled && Boolean(trimmed) && !validationError && !current,
  };
}