import { useUserPermissions } from "@saleor/auth/hooks/useUserPermissions";
import {
  AppExtensionMountEnum,
  ExtensionListQuery,
  PermissionEnum,
  useExtensionListQuery
} from "@saleor/graphql";
import { RelayToFlat } from "@saleor/types";
import { mapEdgesToItems } from "@saleor/utils/maps";

import { AppData, useExternalApp } from "./components/ExternalAppContext";

export interface Extension {
  id: string;
  app: RelayToFlat<ExtensionListQuery["appExtensions"]>[0]["app"];
  accessToken: string;
  permissions: PermissionEnum[];
  label: string;
  mount: AppExtensionMountEnum;
  url: string;
  open(): void;
}
export const extensionMountPoints = {
  PRODUCT_LIST: [
    AppExtensionMountEnum.PRODUCT_OVERVIEW_CREATE,
    AppExtensionMountEnum.PRODUCT_OVERVIEW_MORE_ACTIONS
  ],
  PRODUCT_DETAILS: [AppExtensionMountEnum.PRODUCT_DETAILS_MORE_ACTIONS],
  NAVIGATION_SIDEBAR: [
    AppExtensionMountEnum.NAVIGATION_CATALOG,
    AppExtensionMountEnum.NAVIGATION_CUSTOMERS,
    AppExtensionMountEnum.NAVIGATION_DISCOUNTS,
    AppExtensionMountEnum.NAVIGATION_ORDERS,
    AppExtensionMountEnum.NAVIGATION_PAGES,
    AppExtensionMountEnum.NAVIGATION_TRANSLATIONS
  ]
};

const filterAndMapToTarget = (
  extensions: RelayToFlat<ExtensionListQuery["appExtensions"]>,
  openApp: (appData: AppData) => void
): Extension[] =>
  extensions.map(
    ({ id, accessToken, permissions, url, label, mount, target, app }) => ({
      id,
      app,
      accessToken,
      permissions: permissions.map(({ code }) => code),
      url,
      label,
      mount,
      open: () =>
        openApp({ id: app.id, appToken: accessToken, src: url, label, target })
    })
  );

export const mapToMenuItems = (extensions: Extension[]) =>
  extensions.map(({ label, id, open }) => ({
    label,
    testId: `extension-${id}`,
    onSelect: open
  }));

export const useExtensions = <T extends AppExtensionMountEnum>(
  mountList: T[]
): Record<T, Extension[]> => {
  const { openApp } = useExternalApp();
  const permissions = useUserPermissions();
  const extensionsPermissions = permissions?.find(
    perm => perm.code === PermissionEnum.MANAGE_APPS
  );

  const { data } = useExtensionListQuery({
    fetchPolicy: "cache-first",
    variables: {
      filter: {
        mount: mountList
      }
    },
    skip: !extensionsPermissions
  });

  const extensions = filterAndMapToTarget(
    mapEdgesToItems(data?.appExtensions) || [],
    openApp
  );

  const extensionsMap = mountList.reduce(
    (extensionsMap, mount) => ({ ...extensionsMap, [mount]: [] }),
    {} as Record<T, Extension[]>
  );

  return extensions.reduce(
    (prevExtensionsMap, extension) => ({
      ...prevExtensionsMap,
      [extension.mount]: [
        ...(prevExtensionsMap[extension.mount] || []),
        extension
      ]
    }),
    extensionsMap
  );
};