Add basic storage, temperature history display

TempTrack/Extensions/Date+Extensions.swift

@@ -0,0 +1,65 @@
+import Foundation
+
+extension Date {
+    
+    var seconds: Int {
+        timeIntervalSince1970.roundedInt
+    }
+    
+    var secondsToNow: Int {
+        -timeIntervalSinceNow.roundedInt
+    }
+    
+    init(seconds: Int) {
+        self.init(timeIntervalSince1970: TimeInterval(seconds))
+    }
+    
+    var timePassedText: String {
+        let secs = secondsToNow
+        guard secs > 1 else {
+            return "Now"
+        }
+        guard secs >= 60 else {
+            return "\(secs) seconds ago"
+        }
+        let minutes = secs / 60
+        guard minutes > 1 else {
+            return "1 minute ago"
+        }
+        guard minutes >= 60 else {
+            return "\(minutes) minutes ago"
+        }
+        let hours = minutes / 60
+        guard hours > 1 else {
+            return "1 hour ago"
+        }
+        guard hours >= 60 else {
+            return "\(hours) hours ago"
+        }
+        let days = hours / 24
+        guard days > 1 else {
+            return "1 day ago"
+        }
+        return "\(days) days ago"
+    }
+    
+    var dateIndex: Int {
+        let components = Calendar.current.dateComponents([.day, .month, .year], from: self)
+        return components.year! * 10000 + components.month! * 100 + components.day!
+    }
+    
+    init(dateIndex: Int) {
+        let year = dateIndex / 10000
+        let month = (dateIndex % 10000) / 100
+        let day = dateIndex % 100
+        self = Calendar.current.date(from: .init(year: year, month: month, day: day))!
+    }
+    
+    var startOfDay: Date {
+        Calendar.current.startOfDay(for: self)
+    }
+    
+    var startOfNextDay: Date {
+        startOfDay.addingTimeInterval(86400)
+    }
+}

TempTrack/Extensions/Double+Extensions.swift

@@ -0,0 +1,8 @@
+import Foundation
+
+extension Double {
+    
+    var roundedInt: Int {
+        Int(rounded())
+    }
+}