/*
Copyright 2024 New Vector Ltd.
Copyright 2019 The Matrix.org Foundation C.I.C
Copyright 2017 Vector Creations Ltd
Copyright 2015 OpenMarket Ltd

SPDX-License-Identifier: AGPL-3.0-only
Please see LICENSE in the repository root for full details.
 */

#import <MatrixSDK/MatrixSDK.h>

#import "MXKView.h"

extern NSString *const MXKAuthErrorDomain;

/**
 Authentication types
 */
typedef NS_ENUM(NSUInteger, MXKAuthenticationType) {
    /**
     Type used to sign up.
     */
    MXKAuthenticationTypeRegister,
    /**
     Type used to sign in.
     */
    MXKAuthenticationTypeLogin,
    /**
     Type used to restore an existing account by reseting the password.
     */
    MXKAuthenticationTypeForgotPassword
    
};

@class MXKAuthInputsView;

/**
 `MXKAuthInputsView` delegate
 */
@protocol MXKAuthInputsViewDelegate <NSObject>

/**
 Tells the delegate that an alert must be presented.
 
 @param authInputsView the authentication inputs view.
 @param alert the alert to present.
 */
- (void)authInputsView:(MXKAuthInputsView*)authInputsView presentAlertController:(UIAlertController*)alert;

/**
 For some input fields, the return key of the keyboard is defined as `Done` key.
 By this method, the delegate is notified when this key is pressed.
 */
- (void)authInputsViewDidPressDoneKey:(MXKAuthInputsView *)authInputsView;

@optional

/**
 The matrix REST Client used to validate third-party identifiers.
 */
- (MXRestClient *)authInputsViewThirdPartyIdValidationRestClient:(MXKAuthInputsView *)authInputsView;

/**
 The identity service used to validate third-party identifiers.
 */
- (MXIdentityService *)authInputsViewThirdPartyIdValidationIdentityService:(MXKAuthInputsView *)authInputsView;

/**
 Tell the delegate to present a view controller modally.
 
 Note: This method is used to display the countries list during the phone number handling.
 
 @param authInputsView the authentication inputs view.
 @param viewControllerToPresent the view controller to present.
 @param animated YES to animate the presentation.
 */
- (void)authInputsView:(MXKAuthInputsView *)authInputsView presentViewController:(UIViewController*)viewControllerToPresent animated:(BOOL)animated;

/**
 Tell the delegate to cancel the current operation.
 */
- (void)authInputsViewDidCancelOperation:(MXKAuthInputsView *)authInputsView;

/**
 Tell the delegate to autodiscover the server configuration.
 */
- (void)authInputsView:(MXKAuthInputsView *)authInputsView autoDiscoverServerWithDomain:(NSString*)domain;

@end

/**
 `MXKAuthInputsView` is a base class to handle authentication inputs.
 */
@interface MXKAuthInputsView : MXKView <UITextFieldDelegate>
{
@protected
    /**
     The authentication type (`MXKAuthenticationTypeLogin` by default).
     */
    MXKAuthenticationType type;
    
    /**
     The authentication session (nil by default).
     */
    MXAuthenticationSession *currentSession;
    
    /**
     Alert used to display inputs error.
     */
    UIAlertController *inputsAlert;
}

/**
 The view delegate.
 */
@property (nonatomic, weak) id <MXKAuthInputsViewDelegate> delegate;

/**
 The current authentication type (`MXKAuthenticationTypeLogin` by default).
 */
@property (nonatomic, readonly) MXKAuthenticationType authType;

/**
 The current authentication session if any.
 */
@property (nonatomic, readonly) MXAuthenticationSession *authSession;

/**
 The current filled user identifier (nil by default).
 */
@property (nonatomic, readonly) NSString *userId;

/**
 The current filled password (nil by default).
 */
@property (nonatomic, readonly) NSString *password;

/**
 The layout constraint defined on the view height. This height takes into account shown/hidden fields.
 */
@property (weak, nonatomic) IBOutlet NSLayoutConstraint *viewHeightConstraint;

/**
 Returns the `UINib` object initialized for the auth inputs view.
 
 @return The initialized `UINib` object or `nil` if there were errors during
 initialization or the nib file could not be located.
 */
+ (UINib *)nib;

/**
 Creates and returns a new `MXKAuthInputsView` object.
 
 @discussion This is the designated initializer for programmatic instantiation.
 
 @return An initialized `MXKAuthInputsView` object if successful, `nil` otherwise.
 */
+ (instancetype)authInputsView;

/**
 Finalize the authentication inputs view with a session and a type.
 Use this method to restore the view in its initial step.
 
 @discussion You may override this method to check/update the flows listed in the provided authentication session.
 
 @param authSession the authentication session returned by the homeserver.
 @param authType the authentication type (see 'MXKAuthenticationType').
 @return YES if the provided session and type are supported by the MXKAuthInputsView-inherited class. Note the unsupported flows should be here removed from the stored authentication session (see the resulting session in the property named 'authSession').
 */
- (BOOL)setAuthSession:(MXAuthenticationSession *)authSession withAuthType:(MXKAuthenticationType)authType;

/**
 Check the validity of the required parameters.
 
 @return an error message in case of wrong parameters (nil by default).
 */
- (NSString*)validateParameters;

/**
 Prepare the set of the inputs in order to launch an authentication process.
 
 @param callback the block called when the parameters are prepared. The resulting parameter dictionary is nil
 if something fails (for example when a parameter or a required input is missing). The failure reason is provided in error parameter (nil by default).
 */
- (void)prepareParameters:(void (^)(NSDictionary *parameters, NSError *error))callback;

/**
 Update the current authentication session by providing the list of successful stages.
 
 @param completedStages the list of stages the client has completed successfully. This is an array of MXLoginFlowType.
 @param callback the block called when the parameters have been updated for the next stage. The resulting parameter dictionary is nil
 if something fails (for example when a parameter or a required input is missing). The failure reason is provided in error parameter (nil by default).
 */
- (void)updateAuthSessionWithCompletedStages:(NSArray *)completedStages didUpdateParameters:(void (^)(NSDictionary *parameters, NSError *error))callback;

/**
 Update the current authentication session by providing a set of registration parameters.
 
 @discussion This operation failed if the current authentication type is MXKAuthenticationTypeLogin.
 
 @param registrationParameters a set of parameters to use during the current registration process.
 @return YES if the provided set of parameters is supported.
 */
- (BOOL)setExternalRegistrationParameters:(NSDictionary *)registrationParameters;

/**
 Update the current authentication session by providing soft logout credentials.
 */
@property (nonatomic) MXCredentials *softLogoutCredentials;

/**
 Tell whether all required fields are set
 */
- (BOOL)areAllRequiredFieldsSet;

/**
 Force dismiss keyboard
 */
- (void)dismissKeyboard;

/**
 Switch in next authentication flow step by updating the layout.

 @discussion This method is supposed to be called only if the current operation succeeds.
 */
- (void)nextStep;

/**
 Dispose any resources and listener.
 */
- (void)destroy;

@end