Get total sleep time for the last 7 days

SleepDebt/ContentView.swift

@@ -14,9 +14,24 @@ struct ContentView: View {
             Image(systemName: "globe")
                 .imageScale(.large)
                 .foregroundStyle(.tint)
+            Button(action: {
+                manager.getSleepForLast7Days()
+                print(manager.sleepForLast7Days)
+                var seconds = manager.sleepForLast7Days
+                print("hours: ", seconds / 3600, " minutes: ", (seconds % 3600) / 60, " seconds: ", (seconds % 3600) % 60)
+            }) {
                 Text("Hello, world!")
             }
+        }
         .padding()
+        .onAppear {
+            manager.getSleepForLast7Days()
+            print(manager.sleepForLast7Days)
+            var seconds = manager.sleepForLast7Days
+            print("hours: ", seconds / 3600, " minutes: ", (seconds % 3600) / 60, " seconds: ", (seconds % 3600) % 60)
+            
+            
+        }
     }
 }
 

SleepDebt/HealthKitManager.swift

@@ -8,10 +8,18 @@
 import Foundation
 import HealthKit
 
+extension Date {
+    static var last7Days: Date {
+        Date().addingTimeInterval(TimeInterval(-60 * 60 * 24 * 7)) // last 7 days
+    }
+}
+
 class HealthKitManager: ObservableObject {
     
     let healthStore = HKHealthStore()
     
+    var sleepForLast7Days: Int = 0
+    
     init() {
         let sleep = HKCategoryType(.sleepAnalysis)
         
@@ -24,7 +32,33 @@ class HealthKitManager: ObservableObject {
                 print(error)
             }
         }
+        self.getSleepForLast7Days()
     }
     
+    func getSleepForLast7Days() {
+        var totalSleep = 0
+        let sleep = HKCategoryType(.sleepAnalysis)
+        let sleepPredicate = HKCategoryValueSleepAnalysis.predicateForSamples(equalTo: HKCategoryValueSleepAnalysis.allAsleepValues)
+        let datePredicate = HKQuery.predicateForSamples(withStart: .last7Days, end: .now)
+        let predicates = NSCompoundPredicate(andPredicateWithSubpredicates: [sleepPredicate, datePredicate])
+        let sortByDate = NSSortDescriptor(key: HKSampleSortIdentifierEndDate, ascending: false)
+        let query = HKSampleQuery(
+            sampleType: sleep,
+            predicate: predicates,
+            limit: 100000,
+            sortDescriptors: [sortByDate])
+        {_, results, error in
+            for(_, sample) in results!.enumerated() {
+                guard let currData:HKCategorySample = sample as? HKCategorySample else { print("There was an error"); return }
+                
+                let endDate = currData.endDate
+                let startDate = currData.startDate
+                let seconds = Int(endDate.timeIntervalSince(startDate))
+                totalSleep += seconds
+            }
+            self.sleepForLast7Days = totalSleep
+        }
+        healthStore.execute(query)
+    }
     
 }