import useAddItem from '@commerce/cart/use-add-item';
import type { UseAddItem } from '@commerce/cart/use-add-item';
import type { MutationHook } from '@commerce/utils/types';
import { useCallback } from 'react';
import useCart from './use-cart';
import type { AddItemHook } from '@commerce/types/cart';
import normalizeCart from '../utils/normalizations/normalize-cart';
import type { GraphQLFetcherResult } from '@commerce/api';
import type { IOrder } from '@spree/storefront-api-v2-sdk/types/interfaces/Order';
import type { IToken } from '@spree/storefront-api-v2-sdk/types/interfaces/Token';
import type { AddItem } from '@spree/storefront-api-v2-sdk/types/interfaces/endpoints/CartClass';
import { setCartToken } from '../utils/tokens/cart-token';
import ensureIToken from '../utils/tokens/ensure-itoken';
import createEmptyCart from '../utils/create-empty-cart';
import { FetcherError } from '@commerce/utils/errors';
import isLoggedIn from '../utils/tokens/is-logged-in';

export default useAddItem as UseAddItem<typeof handler>;

export const handler: MutationHook<AddItemHook> = {
  // Provide fetchOptions for SWR cache key
  fetchOptions: {
    url: 'cart',
    query: 'addItem'
  },
  async fetcher({ input, options, fetch }) {
    console.info(
      'useAddItem fetcher called. Configuration: ',
      'input: ',
      input,
      'options: ',
      options
    );

    const { quantity, productId, variantId } = input;

    const safeQuantity = quantity ?? 1;

    let token: IToken | undefined = ensureIToken();

    const addItemParameters: AddItem = {
      variant_id: variantId,
      quantity: safeQuantity,
      include: [
        'line_items',
        'line_items.variant',
        'line_items.variant.product',
        'line_items.variant.product.images',
        'line_items.variant.images',
        'line_items.variant.option_values',
        'line_items.variant.product.option_types'
      ].join(',')
    };

    if (!token) {
      const { data: spreeCartCreateSuccessResponse } = await createEmptyCart(fetch);

      setCartToken(spreeCartCreateSuccessResponse.data.attributes.token);
      token = ensureIToken();
    }

    try {
      const { data: spreeSuccessResponse } = await fetch<GraphQLFetcherResult<IOrder>>({
        variables: {
          methodPath: 'cart.addItem',
          arguments: [token, addItemParameters]
        }
      });

      return normalizeCart(spreeSuccessResponse, spreeSuccessResponse.data);
    } catch (addItemError) {
      if (addItemError instanceof FetcherError && addItemError.status === 404) {
        const { data: spreeRetroactiveCartCreateSuccessResponse } = await createEmptyCart(fetch);

        if (!isLoggedIn()) {
          setCartToken(spreeRetroactiveCartCreateSuccessResponse.data.attributes.token);
        }

        // Return an empty cart. The user has to add the item again.
        // This is going to be a rare situation.

        return normalizeCart(
          spreeRetroactiveCartCreateSuccessResponse,
          spreeRetroactiveCartCreateSuccessResponse.data
        );
      }

      throw addItemError;
    }
  },
  useHook: ({ fetch }) => {
    const useWrappedHook: ReturnType<MutationHook<AddItemHook>['useHook']> = () => {
      const { mutate } = useCart();

      return useCallback(
        async (input) => {
          const data = await fetch({ input });

          await mutate(data, false);

          return data;
        },
        [mutate]
      );
    };

    return useWrappedHook;
  }
};