/*
 * Copyright 2017 Google
 *
 * 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 <Foundation/Foundation.h>

@class FIRAuth;
@class FIRPhoneAuthCredential;
@protocol FIRAuthUIDelegate;

NS_ASSUME_NONNULL_BEGIN

/** @var FIRPhoneAuthProviderID
    @brief A string constant identifying the phone identity provider.
 */
extern NSString *const FIRPhoneAuthProviderID NS_SWIFT_NAME(PhoneAuthProviderID);

/** @var FIRPhoneAuthProviderID
    @brief A string constant identifying the phone sign-in method.
 */
extern NSString *const _Nonnull FIRPhoneAuthSignInMethod NS_SWIFT_NAME(PhoneAuthSignInMethod);


/** @typedef FIRVerificationResultCallback
    @brief The type of block invoked when a request to send a verification code has finished.

    @param verificationID On success, the verification ID provided, nil otherwise.
    @param error On error, the error that occured, nil otherwise.
 */
typedef void (^FIRVerificationResultCallback)(NSString *_Nullable verificationID,
                                              NSError *_Nullable error)
    NS_SWIFT_NAME(VerificationResultCallback);

/** @class FIRPhoneAuthProvider
    @brief A concrete implementation of `FIRAuthProvider` for phone auth providers.
 */
NS_SWIFT_NAME(PhoneAuthProvider)
@interface FIRPhoneAuthProvider : NSObject

/** @fn provider
    @brief Returns an instance of `FIRPhoneAuthProvider` for the default `FIRAuth` object.
 */
+ (instancetype)provider NS_SWIFT_NAME(provider());

/** @fn providerWithAuth:
    @brief Returns an instance of `FIRPhoneAuthProvider` for the provided `FIRAuth` object.

    @param auth The auth object to associate with the phone auth provider instance.
 */
+ (instancetype)providerWithAuth:(FIRAuth *)auth NS_SWIFT_NAME(provider(auth:));

/** @fn verifyPhoneNumber:UIDelegate:completion:
    @brief Starts the phone number authentication flow by sending a verifcation code to the
        specified phone number.
    @param phoneNumber The phone number to be verified.
    @param UIDelegate An object used to present the SFSafariViewController. The object is retained
        by this method until the completion block is executed.
    @param completion The callback to be invoked when the verification flow is finished.
    @remarks Possible error codes:

        + `FIRAuthErrorCodeCaptchaCheckFailed` - Indicates that the reCAPTCHA token obtained by
            the Firebase Auth is invalid or has expired.
        + `FIRAuthErrorCodeQuotaExceeded` - Indicates that the phone verification quota for this
            project has been exceeded.
        + `FIRAuthErrorCodeInvalidPhoneNumber` - Indicates that the phone number provided is
            invalid.
        + `FIRAuthErrorCodeMissingPhoneNumber` - Indicates that a phone number was not provided.
 */
- (void)verifyPhoneNumber:(NSString *)phoneNumber
               UIDelegate:(nullable id<FIRAuthUIDelegate>)UIDelegate
               completion:(nullable FIRVerificationResultCallback)completion;

/** @fn credentialWithVerificationID:verificationCode:
    @brief Creates an `FIRAuthCredential` for the phone number provider identified by the
        verification ID and verification code.

    @param verificationID The verification ID obtained from invoking
        verifyPhoneNumber:completion:
    @param verificationCode The verification code obtained from the user.
    @return The corresponding phone auth credential for the verification ID and verification code
        provided.
 */
- (FIRPhoneAuthCredential *)credentialWithVerificationID:(NSString *)verificationID
                                        verificationCode:(NSString *)verificationCode;

/** @fn init
    @brief Please use the `provider` or `providerWithAuth:` methods to obtain an instance of
        `FIRPhoneAuthProvider`.
 */
- (instancetype)init NS_UNAVAILABLE;

@end

NS_ASSUME_NONNULL_END