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

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

NS_ASSUME_NONNULL_BEGIN

@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 driver
/// that requires presentation of a view controller to authorize a payment.
///
/// 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