/*
 This file is part of GNU Taler
 (C) 2021 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 { ComponentChildren, FunctionalComponent, h, VNode } from "preact";
import { MockEnvironment } from "./mock.js";
import { SWRConfig } from "swr";
import * as swr__internal from "swr/_internal";
import { Logger } from "@gnu-taler/taler-util";
import { buildRequestFailed, RequestError } from "../index.browser.js";

const logger = new Logger("tests/swr.ts");

/**
 * Helper for hook that use SWR inside.
 *
 * buildTestingContext() will return a testing context
 *
 */
export class SwrMockEnvironment extends MockEnvironment {
  constructor(debug = false) {
    super(debug);
  }

  public buildTestingContext(): FunctionalComponent<{
    children: ComponentChildren;
  }> {
    const __SAVE_REQUEST_AND_GET_MOCKED_RESPONSE =
      this.saveRequestAndGetMockedResponse.bind(this);

    function testingFetcher(params: any): any {
      const url = JSON.stringify(params);
      const mocked = __SAVE_REQUEST_AND_GET_MOCKED_RESPONSE<any, any>(
        {
          method: "get",
          url,
        },
        {},
      );

      //unexpected query
      if (!mocked.expectedQuery) return undefined;
      const status = mocked.expectedQuery.query.code ?? 200;
      const requestPayload = mocked.expectedQuery.params?.request;
      const responsePayload = mocked.expectedQuery.params?.response;
      //simulated error
      if (status >= 400) {
        const error = buildRequestFailed(
          url,
          JSON.stringify(responsePayload),
          status,
          requestPayload,
        );
        //example error handling from https://swr.vercel.app/docs/error-handling
        throw new RequestError(error);
      }
      return responsePayload;
    }

    const value: Partial<swr__internal.PublicConfiguration> & {
      provider: () => Map<any, any>;
    } = {
      use: [
        (useSWRNext) => {
          return (key, fetcher, config) => {
            //prevent the request
            //use the testing fetcher instead
            return useSWRNext(key, testingFetcher, config);
          };
        },
      ],
      fetcher: testingFetcher,
      //These options are set for ending the test faster
      //otherwise SWR will create timeouts that will live after the test finished
      loadingTimeout: 0,
      dedupingInterval: 0,
      shouldRetryOnError: false,
      errorRetryInterval: 0,
      errorRetryCount: 0,
      //clean cache for every test
      provider: () => new Map(),
    };

    return function TestingContext({
      children,
    }: {
      children: ComponentChildren;
    }): VNode {
      return h(SWRConfig, { value }, children);
    };
  }
}