/*
 This file is part of GNU Taler
 (C) 2021-2023 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 {
  HttpResponse,
  HttpResponseOk,
  RequestError,
} from "@gnu-taler/web-util/browser";
import { useBackendContext } from "../context/backend.js";
import { AccessToken, MerchantBackend } from "../declaration.js";
import {
  useBackendBaseRequest,
  useBackendInstanceRequest,
  useCredentialsChecker,
  useMatchMutate,
} from "./backend.js";

// FIX default import https://github.com/microsoft/TypeScript/issues/49189
import _useSWR, { SWRHook, useSWRConfig } from "swr";
const useSWR = _useSWR as unknown as SWRHook;

interface InstanceAPI {
  updateInstance: (
    data: MerchantBackend.Instances.InstanceReconfigurationMessage,
  ) => Promise<void>;
  deleteInstance: () => Promise<void>;
  clearAccessToken: (currentToken: AccessToken | undefined) => Promise<void>;
  setNewAccessToken: (currentToken: AccessToken | undefined, token: AccessToken) => Promise<void>;
}

export function useAdminAPI(): AdminAPI {
  const { request } = useBackendBaseRequest();
  const mutateAll = useMatchMutate();

  const createInstance = async (
    instance: MerchantBackend.Instances.InstanceConfigurationMessage,
  ): Promise<void> => {
    await request(`/management/instances`, {
      method: "POST",
      data: instance,
    });

    mutateAll(/\/management\/instances/);
  };

  const deleteInstance = async (id: string): Promise<void> => {
    await request(`/management/instances/${id}`, {
      method: "DELETE",
    });

    mutateAll(/\/management\/instances/);
  };

  const purgeInstance = async (id: string): Promise<void> => {
    await request(`/management/instances/${id}`, {
      method: "DELETE",
      params: {
        purge: "YES",
      },
    });

    mutateAll(/\/management\/instances/);
  };

  return { createInstance, deleteInstance, purgeInstance };
}

export interface AdminAPI {
  createInstance: (
    data: MerchantBackend.Instances.InstanceConfigurationMessage,
  ) => Promise<void>;
  deleteInstance: (id: string) => Promise<void>;
  purgeInstance: (id: string) => Promise<void>;
}

export function useManagementAPI(instanceId: string): InstanceAPI {
  const mutateAll = useMatchMutate();
  const { url: backendURL } = useBackendContext()
  const { updateToken } = useBackendContext();
  const { request } = useBackendBaseRequest();
  const { requestNewLoginToken } = useCredentialsChecker()

  const updateInstance = async (
    instance: MerchantBackend.Instances.InstanceReconfigurationMessage,
  ): Promise<void> => {
    await request(`/management/instances/${instanceId}`, {
      method: "PATCH",
      data: instance,
    });

    mutateAll(/\/management\/instances/);
  };

  const deleteInstance = async (): Promise<void> => {
    await request(`/management/instances/${instanceId}`, {
      method: "DELETE",
    });

    mutateAll(/\/management\/instances/);
  };

  const clearAccessToken = async (currentToken: AccessToken | undefined): Promise<void> => {
    await request(`/management/instances/${instanceId}/auth`, {
      method: "POST",
      token: currentToken,
      data: { method: "external" },
    });

    mutateAll(/\/management\/instances/);
  };

  const setNewAccessToken = async (currentToken: AccessToken | undefined, newToken: AccessToken): Promise<void> => {
    await request(`/management/instances/${instanceId}/auth`, {
      method: "POST",
      token: currentToken,
      data: { method: "token", token: newToken },
    });

    const resp = await requestNewLoginToken(backendURL, newToken)
    if (resp.valid) {
      const { token, expiration } = resp
      updateToken({ token, expiration });
    } else {
      updateToken(undefined)
    }

    mutateAll(/\/management\/instances/);
  };

  return { updateInstance, deleteInstance, setNewAccessToken, clearAccessToken };
}

export function useInstanceAPI(): InstanceAPI {
  const { mutate } = useSWRConfig();
  const { url: backendURL, updateToken } = useBackendContext()

  const {
    token: adminToken,
  } = useBackendContext();
  const { request } = useBackendInstanceRequest();
  const { requestNewLoginToken } = useCredentialsChecker()

  const updateInstance = async (
    instance: MerchantBackend.Instances.InstanceReconfigurationMessage,
  ): Promise<void> => {
    await request(`/private/`, {
      method: "PATCH",
      data: instance,
    });

    if (adminToken) mutate(["/private/instances", adminToken, backendURL], null);
    mutate([`/private/`], null);
  };

  const deleteInstance = async (): Promise<void> => {
    await request(`/private/`, {
      method: "DELETE",
      // token: adminToken,
    });

    if (adminToken) mutate(["/private/instances", adminToken, backendURL], null);
    mutate([`/private/`], null);
  };

  const clearAccessToken = async (currentToken: AccessToken | undefined): Promise<void> => {
    await request(`/private/auth`, {
      method: "POST",
      token: currentToken,
      data: { method: "external" },
    });

    mutate([`/private/`], null);
  };

  const setNewAccessToken = async (currentToken: AccessToken | undefined, newToken: AccessToken): Promise<void> => {
    await request(`/private/auth`, {
      method: "POST",
      token: currentToken,
      data: { method: "token", token: newToken },
    });

    const resp = await requestNewLoginToken(backendURL, newToken)
    if (resp.valid) {
      const { token, expiration } = resp
      updateToken({ token, expiration });
    } else {
      updateToken(undefined)
    }

    mutate([`/private/`], null);
  };

  return { updateInstance, deleteInstance, setNewAccessToken, clearAccessToken };
}

export function useInstanceDetails(): HttpResponse<
  MerchantBackend.Instances.QueryInstancesResponse,
  MerchantBackend.ErrorDetail
> {
  const { fetcher } = useBackendInstanceRequest();

  const { data, error, isValidating } = useSWR<
    HttpResponseOk<MerchantBackend.Instances.QueryInstancesResponse>,
    RequestError<MerchantBackend.ErrorDetail>
  >([`/private/`], fetcher, {
    refreshInterval: 0,
    refreshWhenHidden: false,
    revalidateOnFocus: false,
    revalidateOnReconnect: false,
    refreshWhenOffline: false,
    revalidateIfStale: false,
    errorRetryCount: 0,
    errorRetryInterval: 1,
    shouldRetryOnError: false,
  });

  if (isValidating) return { loading: true, data: data?.data };
  if (data) return data;
  if (error) return error.cause;
  return { loading: true };
}

type KYCStatus =
  | { type: "ok" }
  | { type: "redirect"; status: MerchantBackend.KYC.AccountKycRedirects };

export function useInstanceKYCDetails(): HttpResponse<
  KYCStatus,
  MerchantBackend.ErrorDetail
> {
  const { fetcher } = useBackendInstanceRequest();

  const { data, error } = useSWR<
    HttpResponseOk<MerchantBackend.KYC.AccountKycRedirects>,
    RequestError<MerchantBackend.ErrorDetail>
  >([`/private/kyc`], fetcher, {
    refreshInterval: 60 * 1000,
    refreshWhenHidden: false,
    revalidateOnFocus: false,
    revalidateIfStale: false,
    revalidateOnMount: false,
    revalidateOnReconnect: false,
    refreshWhenOffline: false,
    errorRetryCount: 0,
    errorRetryInterval: 1,
    shouldRetryOnError: false,
  });

  if (data) {
    if (data.info?.status === 202)
      return { ok: true, data: { type: "redirect", status: data.data } };
    return { ok: true, data: { type: "ok" } };
  }
  if (error) return error.cause;
  return { loading: true };
}

export function useManagedInstanceDetails(
  instanceId: string,
): HttpResponse<
  MerchantBackend.Instances.QueryInstancesResponse,
  MerchantBackend.ErrorDetail
> {
  const { request } = useBackendBaseRequest();

  const { data, error, isValidating } = useSWR<
    HttpResponseOk<MerchantBackend.Instances.QueryInstancesResponse>,
    RequestError<MerchantBackend.ErrorDetail>
  >([`/management/instances/${instanceId}`], request, {
    refreshInterval: 0,
    refreshWhenHidden: false,
    revalidateOnFocus: false,
    revalidateOnReconnect: false,
    refreshWhenOffline: false,
    errorRetryCount: 0,
    errorRetryInterval: 1,
    shouldRetryOnError: false,
  });

  if (isValidating) return { loading: true, data: data?.data };
  if (data) return data;
  if (error) return error.cause;
  return { loading: true };
}

export function useBackendInstances(): HttpResponse<
  MerchantBackend.Instances.InstancesResponse,
  MerchantBackend.ErrorDetail
> {
  const { request } = useBackendBaseRequest();

  const { data, error, isValidating } = useSWR<
    HttpResponseOk<MerchantBackend.Instances.InstancesResponse>,
    RequestError<MerchantBackend.ErrorDetail>
  >(["/management/instances"], request);

  if (isValidating) return { loading: true, data: data?.data };
  if (data) return data;
  if (error) return error.cause;
  return { loading: true };
}