import { create } from 'zustand';

/**
 * One breadcrumb hint per pathname. Detail pages push their entity
 * hierarchy into this store on mount via `useBreadcrumbHint`; the
 * topbar Breadcrumbs component reads the hint for the current path
 * and renders Client › Mary Smith › Interest › B17 instead of the
 * URL-only Clients › Interests trail.
 *
 * Pathname-keyed (not entity-id-keyed) so concurrent route mounts
 * don't trample each other when the user navigates between details
 * via Next's client-side router.
 */
export interface BreadcrumbHintCrumb {
  label: string;
  href?: string;
}

export interface BreadcrumbHint {
  parents: BreadcrumbHintCrumb[];
  current: string;
}

interface BreadcrumbStore {
  hints: Record<string, BreadcrumbHint>;
  setHint: (pathname: string, hint: BreadcrumbHint) => void;
  clearHint: (pathname: string) => void;
}

export const useBreadcrumbStore = create<BreadcrumbStore>((set) => ({
  hints: {},
  setHint: (pathname, hint) =>
    set((state) => ({
      hints: { ...state.hints, [pathname]: hint },
    })),
  clearHint: (pathname) =>
    set((state) => {
      const next = { ...state.hints };
      delete next[pathname];
      return { hints: next };
    }),
}));