/*
 This file is part of GNU Taler
 (C) 2021-2024 Taler Systems S.A.

 GNU Taler is free software; you can redistribute it and/or modify it under the
 terms of the GNU General Public License as published by the Free Software
 Foundation; either version 3, or (at your option) any later version.

 GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
 WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
 A PARTICULAR PURPOSE.  See the GNU General Public License for more details.

 You should have received a copy of the GNU General Public License along with
 GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
 */
import {
  useMerchantApiContext
} from "@gnu-taler/web-util/browser";

// FIX default import https://github.com/microsoft/TypeScript/issues/49189
import { AccessToken, OperationOk, TalerHttpError, TalerMerchantApi, TalerMerchantManagementErrorsByMethod, TalerMerchantManagementResultByMethod, opFixedSuccess } from "@gnu-taler/taler-util";
import { useState } from "preact/hooks";
import _useSWR, { SWRHook, mutate } from "swr";
import { useSessionContext } from "../context/session.js";
import { PAGE_SIZE } from "../utils/constants.js";
import { buildPaginatedResult } from "./webhooks.js";
const useSWR = _useSWR as unknown as SWRHook;

type ProductWithId = TalerMerchantApi.ProductDetail & { id: string, serial: number };
function notUndefined(c: ProductWithId | undefined): c is ProductWithId {
  return c !== undefined;
}

export function revalidateInstanceProducts() {
  return mutate(
    (key) => Array.isArray(key) && key[key.length - 1] === "listProductsWithId",
    undefined,
    { revalidate: true },
  );
}
export function useInstanceProducts() {
  const { state: session } = useSessionContext();
  const { lib: { instance } } = useMerchantApiContext();

  const [offset, setOffset] = useState<number | undefined>();

  async function fetcher([token, bid]: [AccessToken, number]) {
    const list = await instance.listProducts(token, {
      limit: PAGE_SIZE,
      offset: bid === undefined ? undefined: String(bid),
      order: "dec",
    });
    if (list.type !== "ok") {
      return list;
    }
    const all: Array<ProductWithId | undefined> = await Promise.all(
      list.body.products.map(async (c) => {
        const r = await instance.getProductDetails(token, c.product_id);
        if (r.type === "fail") {
          return undefined;
        }
        return { ...r.body, id: c.product_id, serial: c.product_serial };
      }),
    );
    const products = all.filter(notUndefined);

    return opFixedSuccess({ products });
  }

  const { data, error } = useSWR<
    OperationOk<{ products: ProductWithId[] }> |
    TalerMerchantManagementErrorsByMethod<"listProducts">,
    TalerHttpError
  >([session.token, offset, "listProductsWithId"], fetcher);

  if (error) return error;
  if (data === undefined) return undefined;
  if (data.type !== "ok") return data;

  return buildPaginatedResult(data.body.products, offset, setOffset, (d) => d.serial)
}

export function revalidateProductDetails() {
  return mutate(
    (key) => Array.isArray(key) && key[key.length - 1] === "getProductDetails",
    undefined,
    { revalidate: true },
  );
}
export function useProductDetails(productId: string) {
  const { state: session } = useSessionContext();
  const { lib: { instance } } = useMerchantApiContext();

  async function fetcher([pid, token]: [string, AccessToken]) {
    return await instance.getProductDetails(token, pid);
  }

  const { data, error } = useSWR<
    TalerMerchantManagementResultByMethod<"getProductDetails">,
    TalerHttpError
  >([productId, session.token, "getProductDetails"], fetcher);

  if (data) return data;
  if (error) return error;
  return undefined;
}