//

// Copyright (C) 2016 Kapeli

//

// This program is free software: you can redistribute it and/or modify

// it under the terms of the GNU General Public License as published by

// the Free Software Foundation, either version 3 of the License, or

// (at your option) any later version.

//

// This program is distributed in the hope that it will be useful,

// but WITHOUT ANY WARRANTY; without even the implied warranty of

// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the

// GNU General Public License for more details.

//

// You should have received a copy of the GNU General Public License

// along with this program. If not, see <http://www.gnu.org/licenses/>.

//

#import "DHAppUpdateChecker.h"

#define DHAppUpdateCheckerLastCheckDate @"DHAppUpdateCheckerLastCheckDate"

#define DHAppUpdateCheckerScheduledUpdateVersion @"DHAppUpdateCheckerScheduledUpdateVersion"

@implementation DHAppUpdateChecker

+ (DHAppUpdateChecker *)sharedUpdateChecker

{

static dispatch_once_t pred;

static DHAppUpdateChecker *_checker = nil;

dispatch_once(&pred, ^{

_checker = [[DHAppUpdateChecker alloc] init];

});

return _checker;

}

- (void)backgroundCheckForUpdatesIfNeeded

{

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

NSDate *lastDate = [defaults objectForKey:DHAppUpdateCheckerLastCheckDate];

if(!lastDate || [[NSDate date] timeIntervalSinceDate:lastDate] > 60*60*24)

{

[defaults setObject:[NSDate date] forKey:DHAppUpdateCheckerLastCheckDate];

dispatch_queue_t queue = dispatch_queue_create([[NSString stringWithFormat:@"%u", arc4random() % 100000] UTF8String], 0);

dispatch_async(queue, ^{

NSData *jsonData = [[NSData alloc] initWithContentsOfURL:[NSURL URLWithString:[@"https://kapeli.com/dash_ios.json?bundle_id=" stringByAppendingString:[NSBundle mainBundle].bundleIdentifier]]];

if(jsonData)

{

NSDictionary *json = [NSJSONSerialization JSONObjectWithData:jsonData options:0 error:nil];

if(json)

{

NSDictionary *infoDict = [[NSBundle mainBundle] infoDictionary];

NSString *myVersion = [infoDict objectForKey:@"CFBundleVersion"];

if([myVersion integerValue] < [json[@"version"] integerValue])

{

[[NSUserDefaults standardUserDefaults] setObject:json[@"version"] forKey:DHAppUpdateCheckerScheduledUpdateVersion];

}

}

}

});

}

}

- (BOOL)alertIfUpdatesAreScheduled

{

NSUserDefaults *defaults = [NSUserDefaults standardUserDefaults];

NSString *version = [defaults objectForKey:DHAppUpdateCheckerScheduledUpdateVersion];

if(version)

{

[defaults removeObjectForKey:DHAppUpdateCheckerScheduledUpdateVersion];

NSDictionary *infoDict = [[NSBundle mainBundle] infoDictionary];

NSString *myVersion = [infoDict objectForKey:@"CFBundleVersion"];

if([version integerValue] > [myVersion integerValue])

{

[UIAlertView showWithTitle:@"Dash Update Available" message:@"A new version of Dash has been released. Would you like to update?" cancelButtonTitle:@"Maybe Later" otherButtonTitles:@[@"Update"] tapBlock:^(UIAlertView *alertView, NSInteger buttonIndex) {

if(buttonIndex == alertView.firstOtherButtonIndex)

{

[[UIApplication sharedApplication] openURL:[NSURL URLWithString:@"https://kapeli.com/dash_ios?ref=update#update"]];

}

}];

return YES;

}

}

return NO;

}

@end