import { ref, computed } from 'vue';
import type { HistoryItem } from '~/types/types';

interface GroupedHistory {
  label: string;
  items: HistoryItem[];
}

const selectedGroupIndex = ref(0);
const selectedItemIndex = ref(0);
const selectedElement = ref<HTMLElement | null>(null);

const useSelectedResult = (groupedHistory: Ref<GroupedHistory[]>) => {
  const selectedItem = computed<HistoryItem | undefined>(() => {
    const group = groupedHistory.value[selectedGroupIndex.value];
    return group?.items[selectedItemIndex.value] ?? undefined;
  });

  const isSelected = (groupIndex: number, itemIndex: number): boolean => {
    return selectedGroupIndex.value === groupIndex && selectedItemIndex.value === itemIndex;
  };

  const selectNext = (): void => {
    const currentGroup = groupedHistory.value[selectedGroupIndex.value];
    if (selectedItemIndex.value < currentGroup.items.length - 1) {
      selectedItemIndex.value++;
    } else if (selectedGroupIndex.value < groupedHistory.value.length - 1) {
      selectedGroupIndex.value++;
      selectedItemIndex.value = 0;
    }
  };

  const selectPrevious = (): void => {
    if (selectedItemIndex.value > 0) {
      selectedItemIndex.value--;
    } else if (selectedGroupIndex.value > 0) {
      selectedGroupIndex.value--;
      selectedItemIndex.value = groupedHistory.value[selectedGroupIndex.value].items.length - 1;
    }
  };

  const selectItem = (groupIndex: number, itemIndex: number): void => {
    selectedGroupIndex.value = groupIndex;
    selectedItemIndex.value = itemIndex;
  };

  return {
    selectedItem,
    isSelected,
    selectNext,
    selectPrevious,
    selectItem,
    selectedElement
  };
};

export default defineNuxtPlugin(() => {
  return {
    provide: {
      selectedResult: {
        selectedGroupIndex,
        selectedItemIndex,
        selectedElement,
        useSelectedResult
      }
    }
  };
});