//  Copyright © 2020 650 Industries. All rights reserved.

#import <EXUpdates/EXUpdatesAppLauncher.h>
#import <EXUpdates/EXUpdatesConfig.h>
#import <EXUpdates/EXUpdatesDatabase.h>
#import <EXUpdates/EXUpdatesSelectionPolicy.h>
#import <EXUpdates/EXUpdatesUpdate.h>

NS_ASSUME_NONNULL_BEGIN

typedef NS_ENUM(NSInteger, EXUpdatesBackgroundUpdateStatus) {
  EXUpdatesBackgroundUpdateStatusError = 0,
  EXUpdatesBackgroundUpdateStatusNoUpdateAvailable = 1,
  EXUpdatesBackgroundUpdateStatusUpdateAvailable = 2
};

@class EXUpdatesAppLoaderTask;

@protocol EXUpdatesAppLoaderTaskDelegate <NSObject>

/**
 * This method gives the delegate a backdoor option to ignore the cached update and force
 * a remote load if it decides the cached update is not runnable. Returning NO from this
 * callback will force a remote load, overriding the timeout and configuration settings for
 * whether or not to check for a remote update. Returning YES from this callback will make
 * EXUpdatesAppLoaderTask proceed as usual.
 */
- (BOOL)appLoaderTask:(EXUpdatesAppLoaderTask *)appLoaderTask didLoadCachedUpdate:(EXUpdatesUpdate *)update;
- (void)appLoaderTask:(EXUpdatesAppLoaderTask *)appLoaderTask didStartLoadingUpdate:(EXUpdatesUpdate *)update;
- (void)appLoaderTask:(EXUpdatesAppLoaderTask *)appLoaderTask didFinishWithLauncher:(id<EXUpdatesAppLauncher>)launcher isUpToDate:(BOOL)isUpToDate;
- (void)appLoaderTask:(EXUpdatesAppLoaderTask *)appLoaderTask didFinishWithError:(NSError *)error;
- (void)appLoaderTask:(EXUpdatesAppLoaderTask *)appLoaderTask didFinishBackgroundUpdateWithStatus:(EXUpdatesBackgroundUpdateStatus)status update:(nullable EXUpdatesUpdate *)update error:(nullable NSError *)error;

@end

@interface EXUpdatesAppLoaderTask : NSObject

@property (nonatomic, weak) id<EXUpdatesAppLoaderTaskDelegate> delegate;

- (instancetype)initWithConfig:(EXUpdatesConfig *)config
                      database:(EXUpdatesDatabase *)database
                     directory:(NSURL *)directory
               selectionPolicy:(id<EXUpdatesSelectionPolicy>)selectionPolicy
                 delegateQueue:(dispatch_queue_t)delegateQueue;

- (void)start;

@end

NS_ASSUME_NONNULL_END