import type { WishlistAction, WishlistItem, WishlistState } from './entities';

export function wishlistReducer(state: WishlistState, action: WishlistAction): WishlistState {
  switch (action.type) {
    case 'TOGGLE_ITEM': {
      const exists = state.items.some((item) => item.id === action.payload.id);
      if (exists) {
        return {
          ...state,
          items: state.items.filter((item) => item.id !== action.payload.id),
        };
      }
      return { ...state, items: [...state.items, action.payload] };
    }

    case 'REMOVE_ITEM':
      return {
        ...state,
        items: state.items.filter((item) => item.id !== action.payload),
      };

    case 'CLEAR_WISHLIST':
      return { ...state, items: [] };

    case 'RESTORE_ITEMS':
      return { ...state, items: action.payload };

    case 'TOGGLE_DRAWER':
      return { ...state, isOpen: !state.isOpen };

    case 'OPEN_DRAWER':
      return { ...state, isOpen: true };

    case 'CLOSE_DRAWER':
      return { ...state, isOpen: false };

    default:
      return state;
  }
}

export function isInWishlist(items: WishlistItem[], id: string): boolean {
  return items.some((item) => item.id === id);
}

export function getWishlistCount(items: WishlistItem[]): number {
  return items.length;
}