Fix missing glucose value display

Author: ps2

Common/Models/WatchContext.swift

@@ -56,14 +56,14 @@ final class WatchContext: NSObject, RawRepresentable {
         if let unitString = rawValue["gu"] as? String {
             let unit = HKUnit(from: unitString)
             preferredGlucoseUnit = unit
+        }
 
-            if let glucoseValue = rawValue["gv"] as? Double {
-                glucose = HKQuantity(unit: unit, doubleValue: glucoseValue)
-            }
+        if let glucoseValue = rawValue["gv"] as? Double {
+            glucose = HKQuantity(unit: preferredGlucoseUnit ?? .milligramsPerDeciliter(), doubleValue: glucoseValue)
+        }
 
-            if let glucoseValue = rawValue["egv"] as? Double {
-                eventualGlucose = HKQuantity(unit: unit, doubleValue: glucoseValue)
-            }
+        if let glucoseValue = rawValue["egv"] as? Double {
+            eventualGlucose = HKQuantity(unit: preferredGlucoseUnit ?? .milligramsPerDeciliter(), doubleValue: glucoseValue)
         }
 
         glucoseTrendRawValue = rawValue["gt"] as? Int
@@ -102,11 +102,10 @@ final class WatchContext: NSObject, RawRepresentable {
         raw["bp"] = batteryPercentage
         raw["cob"] = COB
 
-        if let unit = preferredGlucoseUnit {
-            raw["egv"] = eventualGlucose?.doubleValue(for: unit)
-            raw["gu"] = unit.unitString
-            raw["gv"] = glucose?.doubleValue(for: unit)
-        }
+        let unit = preferredGlucoseUnit ?? .milligramsPerDeciliter()
+        raw["egv"] = eventualGlucose?.doubleValue(for: unit)
+        raw["gu"] = preferredGlucoseUnit?.unitString
+        raw["gv"] = glucose?.doubleValue(for: unit)
 
         raw["gt"] = glucoseTrendRawValue
         raw["gd"] = glucoseDate

WatchApp Extension/ExtensionDelegate.swift

@@ -8,6 +8,7 @@
 
 import WatchConnectivity
 import WatchKit
+import HealthKit
 import os
 import UserNotifications
 
@@ -152,10 +153,23 @@ final class ExtensionDelegate: NSObject, WKExtensionDelegate {
         }
     }
 
+    private lazy var healthStore = HKHealthStore()
+
     fileprivate func updateContext(_ data: [String: Any]) {
         if let context = WatchContext(rawValue: data as WatchContext.RawValue) {
-            DispatchQueue.main.async {
-                self.lastContext = context
+            if context.preferredGlucoseUnit == nil {
+                let type = HKQuantityType.quantityType(forIdentifier: .bloodGlucose)!
+                healthStore.preferredUnits(for: [type]) { (units, error) in
+                    context.preferredGlucoseUnit = units[type]
+
+                    DispatchQueue.main.async {
+                        self.lastContext = context
+                    }
+                }
+            } else {
+                DispatchQueue.main.async {
+                    self.lastContext = context
+                }
             }
         }
     }