From 08ea5bef51a0cbb47d99d0a976ef7c35d4f0d697 Mon Sep 17 00:00:00 2001
From: Andrew Allen <allenan@helium.com>
Date: Sun, 14 Apr 2019 11:02:40 -0700
Subject: [PATCH] add saveBodyFatPercentage

---
 .../RCTAppleHealthKit+Methods_Body.h          |  2 ++
 .../RCTAppleHealthKit+Methods_Body.m          | 24 +++++++++++++++++++
 RCTAppleHealthKit/RCTAppleHealthKit.m         |  5 ++++
 README.md                                     |  2 ++
 docs/saveBodyFatPercentage().md               | 17 +++++++++++++
 5 files changed, 50 insertions(+)
 create mode 100644 docs/saveBodyFatPercentage().md

diff --git a/RCTAppleHealthKit/RCTAppleHealthKit+Methods_Body.h b/RCTAppleHealthKit/RCTAppleHealthKit+Methods_Body.h
index 0867974..d932312 100644
--- a/RCTAppleHealthKit/RCTAppleHealthKit+Methods_Body.h
+++ b/RCTAppleHealthKit/RCTAppleHealthKit+Methods_Body.h
@@ -23,6 +23,8 @@
 - (void)body_saveHeight:(NSDictionary *)input callback:(RCTResponseSenderBlock)callback;
 
 - (void)body_getLatestBodyFatPercentage:(NSDictionary *)input callback:(RCTResponseSenderBlock)callback;
+- (void)body_saveBodyFatPercentage:(NSDictionary *)input callback:(RCTResponseSenderBlock)callback;
+
 - (void)body_getLatestLeanBodyMass:(NSDictionary *)input callback:(RCTResponseSenderBlock)callback;
 
 @end
diff --git a/RCTAppleHealthKit/RCTAppleHealthKit+Methods_Body.m b/RCTAppleHealthKit/RCTAppleHealthKit+Methods_Body.m
index 34fd328..cdf0563 100644
--- a/RCTAppleHealthKit/RCTAppleHealthKit+Methods_Body.m
+++ b/RCTAppleHealthKit/RCTAppleHealthKit+Methods_Body.m
@@ -257,6 +257,30 @@
 }
 
 
+- (void)body_saveBodyFatPercentage:(NSDictionary *)input callback:(RCTResponseSenderBlock)callback
+{
+    
+    double percentage = [RCTAppleHealthKit doubleValueFromOptions:input];
+    NSDate *sampleDate = [RCTAppleHealthKit dateFromOptionsDefaultNow:input];
+    HKUnit *unit = [HKUnit percentUnit];
+    
+    percentage = percentage / 100;
+
+    HKQuantity *bodyFatPercentQuantity = [HKQuantity quantityWithUnit:unit doubleValue:percentage];
+    HKQuantityType *bodyFatPercentType = [HKQuantityType quantityTypeForIdentifier:HKQuantityTypeIdentifierBodyFatPercentage];
+    HKQuantitySample *bodyFatPercentSample = [HKQuantitySample quantitySampleWithType:bodyFatPercentType quantity:bodyFatPercentQuantity startDate:sampleDate endDate:sampleDate];
+    
+    [self.healthStore saveObject:bodyFatPercentSample withCompletion:^(BOOL success, NSError *error) {
+        if (!success) {
+            NSLog(@"error saving body fat percent sample: %@", error);
+            callback(@[RCTMakeError(@"error saving body fat percent sample", error, nil)]);
+            return;
+        }
+        callback(@[[NSNull null], @(percentage)]);
+    }];
+}
+
+
 - (void)body_getLatestLeanBodyMass:(NSDictionary *)input callback:(RCTResponseSenderBlock)callback
 {
     HKQuantityType *leanBodyMassType = [HKQuantityType quantityTypeForIdentifier:HKQuantityTypeIdentifierLeanBodyMass];
diff --git a/RCTAppleHealthKit/RCTAppleHealthKit.m b/RCTAppleHealthKit/RCTAppleHealthKit.m
index c91c471..1d8486c 100644
--- a/RCTAppleHealthKit/RCTAppleHealthKit.m
+++ b/RCTAppleHealthKit/RCTAppleHealthKit.m
@@ -99,6 +99,11 @@ RCT_EXPORT_METHOD(getLatestBodyFatPercentage:(NSDictionary *)input callback:(RCT
     [self body_getLatestBodyFatPercentage:input callback:callback];
 }
 
+RCT_EXPORT_METHOD(saveBodyFatPercentage:(NSDictionary *)input callback:(RCTResponseSenderBlock)callback)
+{
+    [self body_saveBodyFatPercentage:input callback:callback];
+}
+
 RCT_EXPORT_METHOD(getLatestLeanBodyMass:(NSDictionary *)input callback:(RCTResponseSenderBlock)callback)
 {
     [self body_getLatestLeanBodyMass:input callback:callback];
diff --git a/README.md b/README.md
index b5e2e20..3232abe 100644
--- a/README.md
+++ b/README.md
@@ -142,6 +142,7 @@ AppleHealthKit.initHealthKit(options: Object, (err: string, results: Object) =>
       * [saveMindfulSession](/docs/saveMindfulSession().md)
       * [saveWeight](/docs/saveWeight().md)
       * [saveSteps](/docs/saveSteps().md)
+      * [saveBodyFatPercentage](/docs/saveBodyFatPercentage().md)
   * [References](#references)
 
 ## Supported Apple Permissions
@@ -171,6 +172,7 @@ The available Healthkit permissions to use with `initHealthKit`
 | StepCount              | [HKQuantityTypeIdentifierStepCount](https://developer.apple.com/reference/Healthkit/hkquantitytypeidentifierstepcount?language=objc)                               | ✓    | ✓     |
 | Steps                  | [HKQuantityTypeIdentifierSteps](https://developer.apple.com/reference/Healthkit/hkquantitytypeidentifiersteps?language=objc)                                       | ✓    | ✓     |
 | Weight                 | [HKQuantityTypeIdentifierBodyMass](https://developer.apple.com/reference/Healthkit/hkquantitytypeidentifierbodymass?language=objc)                                 | ✓    | ✓     |
+| BodyFatPercentage      | [HKQuantityTypeIdentifierBodyFatPercentage](https://developer.apple.com/reference/Healthkit/hkquantitytypeidentifierbodyfatpercentage?language=objc)                                 | ✓    | ✓     |
 
 These permissions are exported as constants of the `rn-apple-healthkit` module.
 
diff --git a/docs/saveBodyFatPercentage().md b/docs/saveBodyFatPercentage().md
new file mode 100644
index 0000000..e5f2bc3
--- /dev/null
+++ b/docs/saveBodyFatPercentage().md
@@ -0,0 +1,17 @@
+save a percentage body fat value to Healthkit
+
+`saveBodyFatPercentage` accepts an options object containing a percent value:
+```javascript
+let options = {
+  value: 16.7 // 16.7%
+}
+```
+
+```javascript
+AppleHealthKit.saveBodyFatPercentage(options: Object, (err: Object, results: Object) => {
+  if (err) {
+    return;
+  }
+  // body fat percentage successfully saved
+});
+```
-- 
2.26.2