import { create } from 'zustand';

/**
 * In-memory expand state for parent sessions (with subsessions) in the mobile
 * sessions sheet. Deliberately NOT persisted: it survives closing and
 * reopening the sheet (the sheet unmounts on close, but this module-level store
 * does not), and resets on a full page reload.
 */
type MobileSessionExpansionStore = {
  expandedParents: Record<string, boolean>;
  toggleParent: (sessionId: string) => void;
};

export const useMobileSessionExpansionStore = create<MobileSessionExpansionStore>((set) => ({
  expandedParents: {},
  toggleParent: (sessionId) =>
    set((state) => {
      const next = { ...state.expandedParents };
      if (next[sessionId]) delete next[sessionId];
      else next[sessionId] = true;
      return { expandedParents: next };
    }),
}));