Download App Data

//download app data...
-(void)downloadAppData{
    [BT_debugger showIt:self message:[NSString stringWithFormat:@"downloadAppData%@", @""]];

    //get a reference to the appDelegate...
    kprg_appDelegate *appDelegate = (kprg_appDelegate *)[[UIApplication sharedApplication] delegate];

    //start spinner...
    [self.spinner startAnimating];

    //the dataURL may contain merge fields...
    NSString *tmpURL = [BT_strings mergeBTVariablesInString:[appDelegate.rootApp dataURL]];

    //clean up URL
    NSString *escapedUrl = [tmpURL stringByAddingPercentEncodingWithAllowedCharacters:[NSCharacterSet URLFragmentAllowedCharacterSet]];

    [BT_debugger showIt:self theMessage:[NSString stringWithFormat:@"downloading screen data from: %@", escapedUrl]];
    NSString *myFile = escapedUrl;
    NSURLSessionConfiguration *sessionConfiguration = [NSURLSessionConfiguration defaultSessionConfiguration];
    NSURLSession *session = [NSURLSession sessionWithConfiguration:sessionConfiguration delegate:self delegateQueue:nil];
    NSURLSessionDownloadTask *downloadTask = [session downloadTaskWithURL:[NSURL URLWithString:myFile]];
    [downloadTask resume];
}

// Finished downloading; fire off whatever happens after...
- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didFinishDownloadingToURL:(NSURL *)location {
    NSData *data = [NSData dataWithContentsOfURL:location];
    dispatch_async(dispatch_get_main_queue(), ^{
        //

        [BT_fileManager saveDataToFile:data fileName:saveAsFileName];
        NSString *dataString = [[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];
        //        [self parseScreenData:dataString];

        [BT_debugger showIt:self message:@"Finished Download."];
        [BT_debugger showIt:self message:[NSString stringWithFormat:@"Downloaded Info: %@: ", dataString]];

        [self hideProgress];

        //get a reference to the appDelegate...
        kprg_appDelegate *appDelegate = (kprg_appDelegate *)[[UIApplication sharedApplication] delegate];
        //save the version we just downloaded...
        if([BT_fileManager saveTextFileToCacheWithEncoding:dataString fileName:[self saveAsFileName] encodingFlag:-1]){

            //the data we just got must be valid
            if([appDelegate.rootApp validateApplicationData:dataString]){

                //delete previously cached data (this does not remove a cached JSON config file)...
                [BT_fileManager deleteAllLocalData];

                //parse newly downloaded data...
                [appDelegate.rootApp parseJSONData:dataString];

                //flag as not needing refreshed anymore...
                [self setNeedsRefreshed:FALSE];

                //rebuild environment...
                [self configureEnvironmentUsingAppData:dataString];


            }else{

                //remove bogus download...
                [BT_fileManager deleteFile:self.saveAsFileName];

                [BT_debugger showIt:self message:[NSString stringWithFormat:@"error parsing downloaded app config data: %@", @"fuge"]];
                [self showAlert:nil message:NSLocalizedString(@"appDownloadErrorInvalidJSON", @"There was a problem reading some required data. Try again?") alertTag:68];
                [self setNeedsRefreshed:TRUE];

            }

        }else{

            [BT_debugger showIt:self message:[NSString stringWithFormat:@"error saving downloaded app config data%@", @""]];
            [self showAlert:nil message:NSLocalizedString(@"appDownloadErrorCouldNotSave", @"There was a problem saving some required data. Try again?") alertTag:68];
            [self setNeedsRefreshed:TRUE];

        }
    });
}

- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didResumeAtOffset:(int64_t)fileOffset expectedTotalBytes:(int64_t)expectedTotalBytes {
    // Real Men don't pause downloads
}

- (void)URLSession:(NSURLSession *)session downloadTask:(NSURLSessionDownloadTask *)downloadTask didWriteData:(int64_t)bytesWritten totalBytesWritten:(int64_t)totalBytesWritten totalBytesExpectedToWrite:(int64_t)totalBytesExpectedToWrite {

    //    progress = percentage complete. Use the value, or don't.
    //    float progress = (double)totalBytesWritten / (double)totalBytesExpectedToWrite;
    dispatch_async(dispatch_get_main_queue(), ^{
        // update any progress bars here
    });
}
//////////////////////////////////////////////////////////////////