// Copyright 2021 Google LLC
//
// 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.

#if canImport(Combine) && swift(>=5.0)

  #if os(iOS) || targetEnvironment(macCatalyst)

    import Combine
    import FirebaseAuth

    @available(swift 5.0)
    @available(iOS 13.0, macCatalyst 13.0, *)
    @available(macOS, unavailable)
    @available(tvOS, unavailable)
    @available(watchOS, unavailable)
    public extension MultiFactor {
      /// Get a session for a second factor enrollment operation.
      ///
      /// The publisher will emit events on the **main** thread.
      ///
      /// - Returns: A publisher that emits a `MultiFactorSession` for a second factor
      ///   enrollment operation. This is used to identify the current user trying to enroll a second factor. The publisher will emit on
      ///   the *main* thread.
      @discardableResult
      func getSession() -> Future<MultiFactorSession, Error> {
        Future<MultiFactorSession, Error> { promise in
          self.getSessionWithCompletion { session, error in
            if let session = session {
              promise(.success(session))
            } else if let error = error {
              promise(.failure(error))
            }
          }
        }
      }

      /// Enrolls a second factor as identified by the `MultiFactorAssertion` parameter for the
      /// current user.
      ///
      /// The publisher will emit events on the **main** thread.
      ///
      /// - Parameters:
      ///     - assertion: The base class for asserting ownership of a second factor.
      ///     - displayName: An optional display name associated with the multi factor to enroll.
      ///
      /// - Returns: A publisher that emits whether the call was successful or not. The publisher will emit on the *main* thread.
      @discardableResult
      func enroll(with assertion: MultiFactorAssertion,
                  displayName: String?) -> Future<Void, Error> {
        Future<Void, Error> { promise in
          self.enroll(with: assertion, displayName: displayName) { error in
            if let error = error {
              promise(.failure(error))
            } else {
              promise(.success(()))
            }
          }
        }
      }

      /// Unenroll the given multi factor.
      ///
      /// The publisher will emit events on the **main** thread.
      ///
      /// - Parameter factorInfo: The structure used to represent a second factor entity from a client perspective.
      /// - Returns: A publisher that emits when the request to send the unenrollment verification email is complete. The publisher
      /// will emit on the *main* thread.
      @discardableResult
      func unenroll(with factorInfo: MultiFactorInfo) -> Future<Void, Error> {
        Future<Void, Error> { promise in
          self.unenroll(with: factorInfo) { error in
            if let error = error {
              promise(.failure(error))
            } else {
              promise(.success(()))
            }
          }
        }
      }

      /// Unenroll the given multi factor.
      ///
      /// The publisher will emit events on the **main** thread.
      ///
      /// - Returns: A publisher that emits when the request to send the unenrollment verification email is complete.
      /// The publisher will emit on the *main* thread.
      @discardableResult
      func unenroll(withFactorUID factorUID: String) -> Future<Void, Error> {
        Future<Void, Error> { promise in
          self.unenroll(withFactorUID: factorUID) { error in
            if let error = error {
              promise(.failure(error))
            } else {
              promise(.success(()))
            }
          }
        }
      }
    }

  #endif // os(iOS) || targetEnvironment(macCatalyst)

#endif // canImport(Combine) && swift(>=5.0)