on<ListAction.Refresh> {
    flatMap {
        if (it.action.limit > ListAction.DEFAULT_LIMIT) {
            cache.get<List<GiphyItem>>(GiphyListViewModel.KEY_GIPHIES)?.let { giphies ->
                return@flatMap ListState.Screen(giphies, ListState.Mode.IDLE_REFRESH).just()
            }
        }

        loadTrending(ListState.Mode.REFRESH, limit = it.action.limit) { _, list ->
            ListState.Screen(list, ListState.Mode.IDLE_REFRESH)
        }
    }
}

on<ListAction.LoadMore> {
    flatMap {
        loadTrending(ListState.Mode.LOAD_MORE, it.action.offset) { state, list ->
            ListState.Screen(
                state.giphies.toMutableList().apply { addAll(list) },
                ListState.Mode.IDLE_LOAD_MORE
            ).also { screen ->
                cache.save(GiphyListViewModel.KEY_GIPHIES, screen.giphies)
            }
        }
    }
}