/*
     File: StoreManager.h
 Abstract: Retrieves product information from the App Store using SKRequestDelegate,
           SKProductsRequestDelegate,SKProductsResponse, and SKProductsRequest.
           Notifies its observer with a list of products available for sale along with
           a list of invalid product identifiers. Logs an error message if the product request failed.
 
  Version: 1.0
 
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 */

#import <Foundation/Foundation.h>
#import <StoreKit/StoreKit.h>

@protocol StoreManagerDelegate <NSObject>

- (void)queryAppleProductsDidCompleteWithResult:(NSArray<SKProduct *>*)appleProducts;
- (void)queryAppleProductsDidError:(NSError *)error;

@end


@interface StoreManager : NSObject
typedef NS_ENUM(NSInteger, IAPProductRequestStatus)
{
    IAPProductsFound,// Indicate that there are some valid products
    IAPIdentifiersNotFound, // indicate that are some invalid product identifiers
    IAPRequestFailed // Indicate that the product request failed
};

@property (nonatomic, strong) id<StoreManagerDelegate> delegate;
// Provide the status of the product request
@property (nonatomic) IAPProductRequestStatus status;

// Keep track of all valid products. These products are available for sale in the App Store
@property (nonatomic, strong) NSMutableArray *availableProducts;

// Keep track of all invalid product identifiers
@property (nonatomic, strong) NSMutableArray *invalidProductIds;

// Indicate the cause of the product request failure
@property (nonatomic, copy) NSString *errorMessage;

+ (StoreManager *)sharedInstance;

// Query the App Store about the given product identifiers
-(void)fetchProductInformationForIds:(NSArray *)productIds;

// Return the product's title matching a given product identifier
-(NSString *)titleMatchingProductIdentifier:(NSString *)identifier;

@end