RCTAppleHealthKit+Queries.m

//
//  RCTAppleHealthKit+Queries.m
//  RCTAppleHealthKit
//
//  Created by Greg Wilson on 2016-06-26.
//  Copyright © 2016 Greg Wilson. All rights reserved.
//

#import "RCTAppleHealthKit+Queries.h"
#import "RCTAppleHealthKit+Utils.h"

@implementation RCTAppleHealthKit (Queries)


- (void)fetchMostRecentQuantitySampleOfType:(HKQuantityType *)quantityType
                                  predicate:(NSPredicate *)predicate
                                 completion:(void (^)(HKQuantity *, NSDate *, NSDate *, NSError *))completion {

    NSSortDescriptor *timeSortDescriptor = [[NSSortDescriptor alloc]
            initWithKey:HKSampleSortIdentifierEndDate
              ascending:NO
    ];

    HKSampleQuery *query = [[HKSampleQuery alloc]
            initWithSampleType:quantityType
                     predicate:predicate
                         limit:1
               sortDescriptors:@[timeSortDescriptor]
                resultsHandler:^(HKSampleQuery *query, NSArray *results, NSError *error) {

                      if (!results) {
                          if (completion) {
                              completion(nil, nil, nil, error);
                          }
                          return;
                      }

                      if (completion) {
                          // If quantity isn't in the database, return nil in the completion block.
                          HKQuantitySample *quantitySample = results.firstObject;
                          HKQuantity *quantity = quantitySample.quantity;
                          NSDate *startDate = quantitySample.startDate;
                          NSDate *endDate = quantitySample.endDate;
                          completion(quantity, startDate, endDate, error);
                      }
                }
    ];
    [self.healthStore executeQuery:query];
}


- (void)fetchQuantitySamplesOfType:(HKQuantityType *)quantityType
                              unit:(HKUnit *)unit
                         predicate:(NSPredicate *)predicate
                         ascending:(BOOL)asc
                             limit:(NSUInteger)lim
                        completion:(void (^)(NSArray *, NSError *))completion {

    NSSortDescriptor *timeSortDescriptor = [[NSSortDescriptor alloc] initWithKey:HKSampleSortIdentifierEndDate
                                                                       ascending:asc];

    // declare the block
    void (^handlerBlock)(HKSampleQuery *query, NSArray *results, NSError *error);
    // create and assign the block
    handlerBlock = ^(HKSampleQuery *query, NSArray *results, NSError *error) {
        if (!results) {
            if (completion) {
                completion(nil, error);
            }
            return;
        }

        if (completion) {
            NSMutableArray *data = [NSMutableArray arrayWithCapacity:1];

            dispatch_async(dispatch_get_main_queue(), ^{

                for (HKQuantitySample *sample in results) {
                    HKQuantity *quantity = sample.quantity;
                    int value = round([quantity doubleValueForUnit:unit]);

                    int startDateTimestamp = [RCTAppleHealthKit buildTimestampFromDate:sample.startDate];
                    int endDateTimestamp = [RCTAppleHealthKit buildTimestampFromDate:sample.endDate];
                    
                    NSString *deviceName = sample.device.name ? sample.device.name : @"";
                    NSString *deviceManufacturer = sample.device.manufacturer ? sample.device.manufacturer : @"";
                    NSString *deviceHardwareVer = sample.device.hardwareVersion ? sample.device.hardwareVersion : @"";
                    NSString *deviceSoftwareVer = sample.device.softwareVersion ? sample.device.softwareVersion : @"";
                    
                    NSString *sourceName = sample.sourceRevision.source.name;
                    NSString *sourceId = sample.sourceRevision.source.bundleIdentifier;
                    
                    NSString *uuid = sample.UUID.UUIDString;
                    
                    NSString *metadata = [sample.metadata == nil ? @"" : sample.metadata.description stringByReplacingOccurrencesOfString:@" " withString:@""];
                    metadata = [metadata stringByReplacingOccurrencesOfString:@"\r" withString:@""];
                    metadata = [metadata stringByReplacingOccurrencesOfString:@"\n" withString:@""];
                    
                    NSDictionary *elem = @{
                            @"value" : @(value),
                            @"startDate" : @(startDateTimestamp),
                            @"endDate" : @(endDateTimestamp),
                            @"deviceName" : deviceName,
                            @"deviceManufacturer" : deviceManufacturer,
                            @"deviceHardware" : deviceHardwareVer,
                            @"deviceSoftware" : deviceSoftwareVer,
                            @"sourceName" : sourceName,
                            @"sourceId" : sourceId,
                            @"unit" : unit.description,
                            @"uuid" : uuid,
                            @"metadata" : metadata
                    };

                    [data addObject:elem];
                }

                completion(data, error);
            });
        }
    };

    HKSampleQuery *query = [[HKSampleQuery alloc] initWithSampleType:quantityType
                                                           predicate:predicate
                                                               limit:lim
                                                     sortDescriptors:@[timeSortDescriptor]
                                                      resultsHandler:handlerBlock];

    [self.healthStore executeQuery:query];
}


- (void)fetchQuantityDoubleSamplesOfType:(HKQuantityType *)quantityType
                              unit:(HKUnit *)unit
                         predicate:(NSPredicate *)predicate
                         ascending:(BOOL)asc
                             limit:(NSUInteger)lim
                        completion:(void (^)(NSArray *, NSError *))completion {
    
    NSSortDescriptor *timeSortDescriptor = [[NSSortDescriptor alloc] initWithKey:HKSampleSortIdentifierEndDate
                                                                       ascending:asc];
    
    // declare the block
    void (^handlerBlock)(HKSampleQuery *query, NSArray *results, NSError *error);
    // create and assign the block
    handlerBlock = ^(HKSampleQuery *query, NSArray *results, NSError *error) {
        if (!results) {
            if (completion) {
                completion(nil, error);
            }
            return;
        }
        
        if (completion) {
            NSMutableArray *data = [NSMutableArray arrayWithCapacity:1];
            
            dispatch_async(dispatch_get_main_queue(), ^{
                
                for (HKQuantitySample *sample in results) {
                    HKQuantity *quantity = sample.quantity;
                    double value = [quantity doubleValueForUnit:unit];
                    
                    int startDateTimestamp = [RCTAppleHealthKit buildTimestampFromDate:sample.startDate];
                    int endDateTimestamp = [RCTAppleHealthKit buildTimestampFromDate:sample.endDate];
                    
                    NSString *deviceName = sample.device.name ? sample.device.name : @"";
                    NSString *deviceManufacturer = sample.device.manufacturer ? sample.device.manufacturer : @"";
                    NSString *deviceHardwareVer = sample.device.hardwareVersion ? sample.device.hardwareVersion : @"";
                    NSString *deviceSoftwareVer = sample.device.softwareVersion ? sample.device.softwareVersion : @"";
                    
                    NSString *sourceName = sample.sourceRevision.source.name;
                    NSString *sourceId = sample.sourceRevision.source.bundleIdentifier;
                    
                    NSString *uuid = sample.UUID.UUIDString;
                    
                    NSString *metadata = [sample.metadata == nil ? @"" : sample.metadata.description stringByReplacingOccurrencesOfString:@" " withString:@""];
                    metadata = [metadata stringByReplacingOccurrencesOfString:@"\r" withString:@""];
                    metadata = [metadata stringByReplacingOccurrencesOfString:@"\n" withString:@""];
                    
                    NSDictionary *elem = @{
                                           @"value" : @(value),
                                           @"startDate" : @(startDateTimestamp),
                                           @"endDate" : @(endDateTimestamp),
                                           @"deviceName" : deviceName,
                                           @"deviceManufacturer" : deviceManufacturer,
                                           @"deviceHardware" : deviceHardwareVer,
                                           @"deviceSoftware" : deviceSoftwareVer,
                                           @"sourceName" : sourceName,
                                           @"sourceId" : sourceId,
                                           @"unit" : unit.description,
                                           @"uuid" : uuid,
                                           @"metadata" : metadata
                                           };
                    
                    [data addObject:elem];
                }
                
                completion(data, error);
            });
        }
    };
    
    HKSampleQuery *query = [[HKSampleQuery alloc] initWithSampleType:quantityType
                                                           predicate:predicate
                                                               limit:lim
                                                     sortDescriptors:@[timeSortDescriptor]
                                                      resultsHandler:handlerBlock];
    
    [self.healthStore executeQuery:query];
}







- (void)fetchSleepCategorySamplesForPredicate:(NSPredicate *)predicate
                                   limit:(NSUInteger)lim
                                   completion:(void (^)(NSArray *, NSError *))completion {


    NSSortDescriptor *timeSortDescriptor = [[NSSortDescriptor alloc] initWithKey:HKSampleSortIdentifierEndDate
                                                                       ascending:true];


    // declare the block
    void (^handlerBlock)(HKSampleQuery *query, NSArray *results, NSError *error);
    // create and assign the block
    handlerBlock = ^(HKSampleQuery *query, NSArray *results, NSError *error) {
        if (!results) {
            if (completion) {
                completion(nil, error);
            }
            return;
        }

        if (completion) {
            NSMutableArray *data = [NSMutableArray arrayWithCapacity:1];

            dispatch_async(dispatch_get_main_queue(), ^{

                for (HKCategorySample *sample in results) {

                    // HKCategoryType *catType = sample.categoryType;
                    NSInteger val = sample.value;

                    int startDateTimestamp = [RCTAppleHealthKit buildTimestampFromDate:sample.startDate];
                    int endDateTimestamp = [RCTAppleHealthKit buildTimestampFromDate:sample.endDate];

                    NSString *valueString = [NSString stringWithFormat:@"%d", val];
                    
                    NSString *deviceName = sample.device.name ? sample.device.name : @"";
                    NSString *deviceManufacturer = sample.device.manufacturer ? sample.device.manufacturer : @"";
                    NSString *deviceHardwareVer = sample.device.hardwareVersion ? sample.device.hardwareVersion : @"";
                    NSString *deviceSoftwareVer = sample.device.softwareVersion ? sample.device.softwareVersion : @"";
                    
                    NSString *sourceName = sample.sourceRevision.source.name;
                    NSString *sourceId = sample.sourceRevision.source.bundleIdentifier;
                    
                    NSString *uuid = sample.UUID.UUIDString;
                    
                    NSString *metadata = [sample.metadata == nil ? @"" : sample.metadata.description stringByReplacingOccurrencesOfString:@" " withString:@""];
                    metadata = [metadata stringByReplacingOccurrencesOfString:@"\r" withString:@""];
                    metadata = [metadata stringByReplacingOccurrencesOfString:@"\n" withString:@""];

                    NSDictionary *elem = @{
                            @"value" : valueString,
                            @"startDate" : @(startDateTimestamp),
                            @"endDate" : @(endDateTimestamp),
                            @"deviceName" : deviceName,
                            @"deviceManufacturer" : deviceManufacturer,
                            @"deviceHardware" : deviceHardwareVer,
                            @"deviceSoftware" : deviceSoftwareVer,
                            @"sourceName" : sourceName,
                            @"sourceId" : sourceId,
                            @"uuid" : uuid,
                            @"metadata" : metadata
                    };

                    [data addObject:elem];
                }

                completion(data, error);
            });
        }
    };

    HKCategoryType *categoryType =
    [HKObjectType categoryTypeForIdentifier:HKCategoryTypeIdentifierSleepAnalysis];

   HKSampleQuery *query = [[HKSampleQuery alloc] initWithSampleType:categoryType
                                                          predicate:predicate
                                                              limit:lim
                                                    sortDescriptors:@[timeSortDescriptor]
                                                     resultsHandler:handlerBlock];


    [self.healthStore executeQuery:query];
}


- (void)fetchCorrelationSamplesOfType:(HKQuantityType *)quantityType
                                 unit:(HKUnit *)unit
                            predicate:(NSPredicate *)predicate
                            ascending:(BOOL)asc
                                limit:(NSUInteger)lim
                           completion:(void (^)(NSArray *, NSError *))completion {

    NSSortDescriptor *timeSortDescriptor = [[NSSortDescriptor alloc] initWithKey:HKSampleSortIdentifierEndDate
                                                                       ascending:asc];

    // declare the block
    void (^handlerBlock)(HKSampleQuery *query, NSArray *results, NSError *error);
    // create and assign the block
    handlerBlock = ^(HKSampleQuery *query, NSArray *results, NSError *error) {
        if (!results) {
            if (completion) {
                completion(nil, error);
            }
            return;
        }

        if (completion) {
            NSMutableArray *data = [NSMutableArray arrayWithCapacity:1];

            dispatch_async(dispatch_get_main_queue(), ^{

                for (HKCorrelation *sample in results) {
                    int startDateTimestamp = [RCTAppleHealthKit buildTimestampFromDate:sample.startDate];
                    int endDateTimestamp = [RCTAppleHealthKit buildTimestampFromDate:sample.endDate];

                    NSDictionary *elem = @{
                      @"correlation" : sample,
                      @"startDate" : @(startDateTimestamp),
                      @"endDate" : @(endDateTimestamp),
                    };
                    [data addObject:elem];
                }

                completion(data, error);
            });
        }
    };

    HKSampleQuery *query = [[HKSampleQuery alloc] initWithSampleType:quantityType
                                                           predicate:predicate
                                                               limit:lim
                                                     sortDescriptors:@[timeSortDescriptor]
                                                      resultsHandler:handlerBlock];

    [self.healthStore executeQuery:query];
}


- (void)fetchSumOfSamplesTodayForType:(HKQuantityType *)quantityType
                                 unit:(HKUnit *)unit
                           completion:(void (^)(double, NSError *))completionHandler {

    NSPredicate *predicate = [RCTAppleHealthKit predicateForSamplesToday];
    HKStatisticsQuery *query = [[HKStatisticsQuery alloc] initWithQuantityType:quantityType
                                                          quantitySamplePredicate:predicate
                                                          options:HKStatisticsOptionCumulativeSum
                                                          completionHandler:^(HKStatisticsQuery *query, HKStatistics *result, NSError *error) {
                                                                HKQuantity *sum = [result sumQuantity];
                                                                if (completionHandler) {
                                                                    double value = [sum doubleValueForUnit:unit];
                                                                    completionHandler(value, error);
                                                                }
                                                          }];

    [self.healthStore executeQuery:query];
}


- (void)fetchSumOfSamplesOnDayForType:(HKQuantityType *)quantityType
                                 unit:(HKUnit *)unit
                                  day:(NSDate *)day
                           completion:(void (^)(double, NSDate *, NSDate *, NSError *))completionHandler {

    NSPredicate *predicate = [RCTAppleHealthKit predicateForSamplesOnDay:day];
    HKStatisticsQuery *query = [[HKStatisticsQuery alloc] initWithQuantityType:quantityType
                                                          quantitySamplePredicate:predicate
                                                          options:HKStatisticsOptionCumulativeSum
                                                          completionHandler:^(HKStatisticsQuery *query, HKStatistics *result, NSError *error) {
                                                              HKQuantity *sum = [result sumQuantity];
                                                              NSDate *startDate = result.startDate;
                                                              NSDate *endDate = result.endDate;
                                                              if (completionHandler) {
                                                                     double value = [sum doubleValueForUnit:unit];
                                                                     completionHandler(value,startDate, endDate, error);
                                                              }
                                                          }];

    [self.healthStore executeQuery:query];
}


- (void)fetchCumulativeSumStatisticsCollection:(HKQuantityType *)quantityType
                                          unit:(HKUnit *)unit
                                     startDate:(NSDate *)startDate
                                       endDate:(NSDate *)endDate
                                    completion:(void (^)(NSArray *, NSError *))completionHandler {

    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *interval = [[NSDateComponents alloc] init];
    interval.day = 1;

    NSDateComponents *anchorComponents = [calendar components:NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear
                                                     fromDate:[NSDate date]];
    anchorComponents.hour = 0;
    NSDate *anchorDate = [calendar dateFromComponents:anchorComponents];

    // Create the query
    HKStatisticsCollectionQuery *query = [[HKStatisticsCollectionQuery alloc] initWithQuantityType:quantityType
                                                                           quantitySamplePredicate:nil
                                                                                           options:HKStatisticsOptionCumulativeSum
                                                                                        anchorDate:anchorDate
                                                                                intervalComponents:interval];

    // Set the results handler
    query.initialResultsHandler = ^(HKStatisticsCollectionQuery *query, HKStatisticsCollection *results, NSError *error) {
        if (error) {
            // Perform proper error handling here
            NSLog(@"*** An error occurred while calculating the statistics: %@ ***",error.localizedDescription);
        }

        NSMutableArray *data = [NSMutableArray arrayWithCapacity:1];
        [results enumerateStatisticsFromDate:startDate
                                      toDate:endDate
                                   withBlock:^(HKStatistics *result, BOOL *stop) {

                                       HKQuantity *quantity = result.sumQuantity;
                                       if (quantity) {
                                           NSDate *date = result.startDate;
                                           double value = [quantity doubleValueForUnit:[HKUnit countUnit]];
                                           NSLog(@"%@: %f", date, value);

                                           NSString *dateString = [RCTAppleHealthKit buildISO8601StringFromDate:date];
                                           NSArray *elem = @[dateString, @(value)];
                                           [data addObject:elem];
                                       }
                                   }];
        NSError *err;
        completionHandler(data, err);
    };

    [self.healthStore executeQuery:query];
}


- (void)fetchCumulativeSumStatisticsCollection:(HKQuantityType *)quantityType
                                          unit:(HKUnit *)unit
                                     startDate:(NSDate *)startDate
                                       endDate:(NSDate *)endDate
                                     ascending:(BOOL)asc
                                         limit:(NSUInteger)lim
                                           gap:(NSString *)gap
                                    completion:(void (^)(NSArray *, NSError *))completionHandler {

    NSCalendar *calendar = [NSCalendar currentCalendar];
    NSDateComponents *interval = [[NSDateComponents alloc] init];
    if([gap isEqual: @"hour"]){
        interval.hour = 1;
    }else {
        interval.day = 1;
    }

    NSDateComponents *anchorComponents = [calendar components:NSCalendarUnitDay | NSCalendarUnitMonth | NSCalendarUnitYear
                                                     fromDate:[NSDate date]];
    anchorComponents.hour = 0;
    NSDate *anchorDate = [calendar dateFromComponents:anchorComponents];

    // Create the query
    HKStatisticsCollectionQuery *query = [[HKStatisticsCollectionQuery alloc] initWithQuantityType:quantityType
                                                                           quantitySamplePredicate:nil
                                                                                           options:HKStatisticsOptionCumulativeSum
                                                                                        anchorDate:anchorDate
                                                                                intervalComponents:interval];

    // Set the results handler
    query.initialResultsHandler = ^(HKStatisticsCollectionQuery *query, HKStatisticsCollection *results, NSError *error) {
        if (error) {
            // Perform proper error handling here
            NSLog(@"*** An error occurred while calculating the statistics: %@ ***", error.localizedDescription);
        }

        NSMutableArray *data = [NSMutableArray arrayWithCapacity:1];

        [results enumerateStatisticsFromDate:startDate
                                      toDate:endDate
                                   withBlock:^(HKStatistics *result, BOOL *stop) {

                                       HKQuantity *quantity = result.sumQuantity;
                                       if (quantity) {
                                           NSDate *startDate = result.startDate;
                                           NSDate *endDate = result.endDate;
                                           int value = round([quantity doubleValueForUnit:unit]);

                                           int startDateTimestamp = [RCTAppleHealthKit buildTimestampFromDate:startDate];
                                           int endDateTimestamp = [RCTAppleHealthKit buildTimestampFromDate:endDate];

                                           NSDictionary *elem = @{
                                                   @"value" : @(value),
                                                   @"startDate" : @(startDateTimestamp),
                                                   @"endDate" : @(endDateTimestamp),
                                           };
                                           [data addObject:elem];
                                       }
                                   }];
        // is ascending by default
        if(asc == false) {
            [RCTAppleHealthKit reverseNSMutableArray:data];
        }

        if((lim > 0) && ([data count] > lim)) {
            NSArray* slicedArray = [data subarrayWithRange:NSMakeRange(0, lim)];
            NSError *err;
            completionHandler(slicedArray, err);
        } else {
            NSError *err;
            completionHandler(data, err);
        }
    };

    [self.healthStore executeQuery:query];
}

- (void)fetchQuantitySamplesOfTypeByAnchor:(HKQuantityType *)quantityType
                                      unit:(HKUnit *)unit
                                 predicate:(NSPredicate *)predicate
                                 ascending:(BOOL)asc
                                     limit:(NSUInteger)lim
                                completion:(void (^)(NSDictionary *, NSError *))completion {
    
    void (^anchorHandlerBlock)(HKAnchoredObjectQuery *query, NSArray *sampleObjects, NSArray *deletedObjects, HKQueryAnchor *newAnchor, NSError *error);
    anchorHandlerBlock = ^(HKAnchoredObjectQuery *query, NSArray *sampleObjects, NSArray *deletedObjects, HKQueryAnchor *newAnchor, NSError *error) {
        if (!sampleObjects && !deletedObjects) {
            if (completion) {
                completion(nil, error);
            }
            return;
        }
        
        NSData *data = [NSKeyedArchiver archivedDataWithRootObject:newAnchor];
        [[NSUserDefaults standardUserDefaults] setObject:data forKey:[RCTAppleHealthKit stringFromType:quantityType status:false]];
        
        if (completion) {
            NSMutableArray *data = [NSMutableArray arrayWithCapacity:1];
            NSMutableArray *removeData = [NSMutableArray arrayWithCapacity:1];
            
            dispatch_async(dispatch_get_main_queue(), ^{
                
                for (HKQuantitySample *sample in sampleObjects) {
                    HKQuantity *quantity = sample.quantity;
                    double value = [quantity doubleValueForUnit:unit];
                    
                    int startDateTimestamp = [RCTAppleHealthKit buildTimestampFromDate:sample.startDate];
                    int endDateTimestamp = [RCTAppleHealthKit buildTimestampFromDate:sample.endDate];
                    
                    NSString *deviceName = sample.device.name ? sample.device.name : @"";
                    NSString *deviceManufacturer = sample.device.manufacturer ? sample.device.manufacturer : @"";
                    NSString *deviceHardwareVer = sample.device.hardwareVersion ? sample.device.hardwareVersion : @"";
                    NSString *deviceSoftwareVer = sample.device.softwareVersion ? sample.device.softwareVersion : @"";
                    
                    NSString *sourceName = sample.sourceRevision.source.name;
                    NSString *sourceId = sample.sourceRevision.source.bundleIdentifier;
                    
                    NSString *uuid = sample.UUID.UUIDString;
                    
                    NSString *metadata = [sample.metadata == nil ? @"" : sample.metadata.description stringByReplacingOccurrencesOfString:@" " withString:@""];
                    metadata = [metadata stringByReplacingOccurrencesOfString:@"\r" withString:@""];
                    metadata = [metadata stringByReplacingOccurrencesOfString:@"\n" withString:@""];
                    
                    NSDictionary *elem = @{
                                           @"value" : @(value),
                                           @"startDate" : @(startDateTimestamp),
                                           @"endDate" : @(endDateTimestamp),
                                           @"deviceName" : deviceName,
                                           @"deviceManufacturer" : deviceManufacturer,
                                           @"deviceHardware" : deviceHardwareVer,
                                           @"deviceSoftware" : deviceSoftwareVer,
                                           @"sourceName" : sourceName,
                                           @"sourceId" : sourceId,
                                           @"unit" : unit.description,
                                           @"uuid" : uuid,
                                           @"metadata" : metadata
                                           };
                    
                    [data addObject:elem];
                }
                
                for (HKDeletedObject *sample in deletedObjects) {
                    [removeData addObject:sample.UUID.UUIDString];
                }
                
                NSDictionary *result = @{
                                         @"samples" : data,
                                         @"deleteSamples" : removeData
                                         };
                
                completion(result, error);
            });
        }
    };
    
    NSData *data = [[NSUserDefaults standardUserDefaults] objectForKey:[RCTAppleHealthKit stringFromType:quantityType status:true]];
    HKQueryAnchor *anchor = [NSKeyedUnarchiver unarchiveObjectWithData:data];
    
    HKAnchoredObjectQuery *anchorQuery = [[HKAnchoredObjectQuery alloc] initWithType:quantityType
                                                                           predicate:nil
                                                                              anchor:anchor
                                                                               limit:lim
                                                                      resultsHandler:anchorHandlerBlock];
    [self.healthStore executeQuery:anchorQuery];
}

- (void)fetchCorrelationSamplesOfTypeByAnchor:(HKQuantityType *)quantityType
                                         unit:(HKUnit *)unit
                                    predicate:(NSPredicate *)predicate
                                    ascending:(BOOL)asc
                                        limit:(NSUInteger)lim
                                   completion:(void (^)(NSDictionary *, NSError *))completion
{
    void (^anchorHandlerBlock)(HKAnchoredObjectQuery *query, NSArray *sampleObjects, NSArray *deletedObjects, HKQueryAnchor *newAnchor, NSError *error);
    anchorHandlerBlock = ^(HKAnchoredObjectQuery *query, NSArray *sampleObjects, NSArray *deletedObjects, HKQueryAnchor *newAnchor, NSError *error) {
        if (!sampleObjects && !deletedObjects) {
            if (completion) {
                completion(nil, error);
            }
            return;
        }
        
        NSData *data = [NSKeyedArchiver archivedDataWithRootObject:newAnchor];
        [[NSUserDefaults standardUserDefaults] setObject:data forKey:[RCTAppleHealthKit stringFromType:quantityType status:false]];
        
        if (completion) {
            NSMutableArray *data = [NSMutableArray arrayWithCapacity:1];
            NSMutableArray *removeData = [NSMutableArray arrayWithCapacity:1];
            
            dispatch_async(dispatch_get_main_queue(), ^{
                
                for (HKCorrelation *sample in sampleObjects) {
                    int startDateTimestamp = [RCTAppleHealthKit buildTimestampFromDate:sample.startDate];
                    int endDateTimestamp = [RCTAppleHealthKit buildTimestampFromDate:sample.endDate];

                    NSDictionary *elem = @{
                                           @"correlation" : sample,
                                           @"startDate" : @(startDateTimestamp),
                                           @"endDate" : @(endDateTimestamp),
                                           };
                    [data addObject:elem];
                }
                
                for (HKDeletedObject *sample in deletedObjects) {
                    [removeData addObject:sample.UUID.UUIDString];
                }
                
                NSDictionary *result = @{
                                         @"samples" : data,
                                         @"deleteSamples" : removeData
                                         };
                
                completion(result, error);
            });
        }
    };
    
    NSData *data = [[NSUserDefaults standardUserDefaults] objectForKey:[RCTAppleHealthKit stringFromType:quantityType status:true]];
    HKQueryAnchor *anchor = [NSKeyedUnarchiver unarchiveObjectWithData:data];
    
    HKAnchoredObjectQuery *anchorQuery = [[HKAnchoredObjectQuery alloc] initWithType:quantityType
                                                                           predicate:nil
                                                                              anchor:anchor
                                                                               limit:lim
                                                                      resultsHandler:anchorHandlerBlock];
    
    [self.healthStore executeQuery:anchorQuery];
}

- (void)fetchSleepCategorySamplesForPredicateByAnchor:(NSPredicate *)predicate
                                                limit:(NSUInteger)lim
                                           completion:(void (^)(NSDictionary *, NSError *))completion
{
    HKCategoryType *categoryType = [HKObjectType categoryTypeForIdentifier:HKCategoryTypeIdentifierSleepAnalysis];
    
    void (^anchorHandlerBlock)(HKAnchoredObjectQuery *query, NSArray *sampleObjects, NSArray *deletedObjects, HKQueryAnchor *newAnchor, NSError *error);
    anchorHandlerBlock = ^(HKAnchoredObjectQuery *query, NSArray *sampleObjects, NSArray *deletedObjects, HKQueryAnchor *newAnchor, NSError *error) {
        if (!sampleObjects && !deletedObjects) {
            if (completion) {
                completion(nil, error);
            }
            return;
        }
        
        NSData *data = [NSKeyedArchiver archivedDataWithRootObject:newAnchor];
        [[NSUserDefaults standardUserDefaults] setObject:data forKey:[RCTAppleHealthKit stringFromType:categoryType status:false]];
        
        if (completion) {
            NSMutableArray *data = [NSMutableArray arrayWithCapacity:1];
            NSMutableArray *removeData = [NSMutableArray arrayWithCapacity:1];
            
            dispatch_async(dispatch_get_main_queue(), ^{
                
                for (HKCategorySample *sample in sampleObjects) {
                    NSInteger val = sample.value;
                    
                    int startDateTimestamp = [RCTAppleHealthKit buildTimestampFromDate:sample.startDate];
                    int endDateTimestamp = [RCTAppleHealthKit buildTimestampFromDate:sample.endDate];
                    
                    NSString *valueString = [NSString stringWithFormat:@"%d", val];
                    
                    NSString *deviceName = sample.device.name ? sample.device.name : @"";
                    NSString *deviceManufacturer = sample.device.manufacturer ? sample.device.manufacturer : @"";
                    NSString *deviceHardwareVer = sample.device.hardwareVersion ? sample.device.hardwareVersion : @"";
                    NSString *deviceSoftwareVer = sample.device.softwareVersion ? sample.device.softwareVersion : @"";
                    
                    NSString *sourceName = sample.sourceRevision.source.name;
                    NSString *sourceId = sample.sourceRevision.source.bundleIdentifier;
                    
                    NSString *uuid = sample.UUID.UUIDString;
                    
                    NSString *metadata = [sample.metadata == nil ? @"" : sample.metadata.description stringByReplacingOccurrencesOfString:@" " withString:@""];
                    metadata = [metadata stringByReplacingOccurrencesOfString:@"\r" withString:@""];
                    metadata = [metadata stringByReplacingOccurrencesOfString:@"\n" withString:@""];
                    
                    NSDictionary *elem = @{
                                           @"value" : valueString,
                                           @"startDate" : @(startDateTimestamp),
                                           @"endDate" : @(endDateTimestamp),
                                           @"deviceName" : deviceName,
                                           @"deviceManufacturer" : deviceManufacturer,
                                           @"deviceHardware" : deviceHardwareVer,
                                           @"deviceSoftware" : deviceSoftwareVer,
                                           @"sourceName" : sourceName,
                                           @"sourceId" : sourceId,
                                           @"uuid" : uuid,
                                           @"metadata" : metadata
                                           };
                    
                    [data addObject:elem];
                }
                
                for (HKDeletedObject *sample in deletedObjects) {
                    [removeData addObject:sample.UUID.UUIDString];
                }
                
                NSDictionary *result = @{
                                         @"samples" : data,
                                         @"deleteSamples" : removeData
                                         };
                
                completion(result, error);
            });
        }
    };
    
    NSData *data = [[NSUserDefaults standardUserDefaults] objectForKey:[RCTAppleHealthKit stringFromType:categoryType status:true]];
    HKQueryAnchor *anchor = [NSKeyedUnarchiver unarchiveObjectWithData:data];
    
    HKAnchoredObjectQuery *anchorQuery = [[HKAnchoredObjectQuery alloc] initWithType:categoryType
                                                                           predicate:predicate
                                                                              anchor:anchor
                                                                               limit:lim
                                                                      resultsHandler:anchorHandlerBlock];
    
    [self.healthStore executeQuery:anchorQuery];
}

@end