/*
 * Copyright 2023 The Backstage Authors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

import {
  createSignInResolverFactory,
  SignInInfo,
} from '@backstage/plugin-auth-node';
import { CloudflareAccessResult } from './types';
import { z } from 'zod';

/**
 * Available sign-in resolvers for the Cloudflare Access auth provider.
 *
 * @public
 */
export namespace cloudflareAccessSignInResolvers {
  /**
   * Looks up the user by matching their email to the entity email.
   */
  export const emailMatchingUserEntityProfileEmail =
    createSignInResolverFactory({
      optionsSchema: z
        .object({
          dangerouslyAllowSignInWithoutUserInCatalog: z.boolean().optional(),
        })
        .optional(),
      create(options = {}) {
        return async (info: SignInInfo<CloudflareAccessResult>, ctx) => {
          const { profile } = info;

          if (!profile.email) {
            throw new Error(
              'Login failed, user profile does not contain an email',
            );
          }

          return ctx.signInWithCatalogUser(
            {
              filter: {
                'spec.profile.email': profile.email,
              },
            },
            {
              dangerousEntityRefFallback:
                options?.dangerouslyAllowSignInWithoutUserInCatalog
                  ? { entityRef: { name: profile.email } }
                  : undefined,
            },
          );
        };
      },
    });
}