#import "BTPaymentRequest.h"
#import "BTUIThemedView.h"
#import <UIKit/UIKit.h>

@protocol BTAppSwitchDelegate, BTViewControllerPresentingDelegate;
@class BTAPIClient, BTPaymentMethodNonce;

NS_ASSUME_NONNULL_BEGIN

/**
 A UIView representing a payment option 
 */
@interface BTPaymentButton : BTUIThemedView

/**
 Initialize a BTPaymentButton.

 @param apiClient A `BTAPIClient` used for communicating with Braintree servers. Required.
 @param completion A completion block. Required.

 @return A new BTPaymentButton.
*/
- (instancetype)initWithAPIClient:(BTAPIClient *)apiClient
                       completion:(void(^)(BTPaymentMethodNonce * _Nullable paymentMethodNonce, NSError * _Nullable error))completion;

/**
 The `BTAPIClient` used for communicating with Braintree servers.

 This property is exposed to enable the use of other UIView initializers, e.g.
 when using Storyboards.
*/
@property (nonatomic, strong, nullable) BTAPIClient *apiClient;

/**
 The `BTPaymentRequest` that customizes the payment experience.
*/
@property (nonatomic, strong, nullable) BTPaymentRequest *paymentRequest;

/**
 The completion block to handle the result of a payment authorization flow.

 This property is exposed to enable the use of other `UIView` initializers, e.g.
 when using Storyboards.
*/
@property (nonatomic, copy) void(^completion)(BTPaymentMethodNonce * _Nullable paymentMethodNonce, NSError * _Nullable error);

/**
 Set of payment options as strings.
 e.g. `@"PayPal"`, `@"Venmo"`. By default, this is configured
 to the set of payment options that have been included in the client-side app integration,
 e.g. via frameworks.

 Setting this property will force the button to reload and display the specified payment options,
 even if the payment option is disabled in the Control Panel.
*/
@property (nonatomic, strong) NSOrderedSet <NSString *> *enabledPaymentOptions;

/**
 The configuration from a `BTAPIClient`.
 This is automatically fetched when the payment button
 is initialized with a `BTAPIClient`, but it can be `nil` if the `BTAPIClient` has not yet been
 set or if the configuration fetch fails.

 Setting this property will force the button to reload using the new configuration.
*/
@property (nonatomic, strong, nullable) BTConfiguration *configuration;

/**
 Optional delegate for receiving payment lifecycle messages from a payment option that may initiate an app or browser switch to authorize payments.
*/
@property (nonatomic, weak, nullable) id <BTAppSwitchDelegate> appSwitchDelegate;

/**
 Optional delegate for receiving payment lifecycle messages from a payment driverthat requires presentation of a view controller to authorize a payment.

 @note Required by PayPal.
*/
@property (nonatomic, weak, nullable) id <BTViewControllerPresentingDelegate> viewControllerPresentingDelegate;

/**
 Indicates whether any payment options available.
*/
@property (nonatomic, readonly) BOOL hasAvailablePaymentMethod;

@end

NS_ASSUME_NONNULL_END