Add clock entry using Measurement

CodeChallenge.xcodeproj/project.pbxproj

@@ -35,6 +35,7 @@
 		9489866A1BE5CFB000D34976 /* CodeChallengeType.swift in Sources */ = {isa = PBXBuildFile; fileRef = 948986691BE5CFB000D34976 /* CodeChallengeType.swift */; };
 		948986701BE5D28500D34976 /* ExampleCodeChallenge.swift in Sources */ = {isa = PBXBuildFile; fileRef = 9489866F1BE5D28500D34976 /* ExampleCodeChallenge.swift */; };
 		94FB98CA1BE1B5D800228845 /* TwoSumChallenge.swift in Sources */ = {isa = PBXBuildFile; fileRef = 94FB98C91BE1B5D800228845 /* TwoSumChallenge.swift */; };
+		D5D15B361E0C966A00CC9B1C /* felixdumitClockEntry.swift in Sources */ = {isa = PBXBuildFile; fileRef = D5D15B351E0C966A00CC9B1C /* felixdumitClockEntry.swift */; };
 /* End PBXBuildFile section */
 
 /* Begin PBXContainerItemProxy section */
@@ -79,6 +80,7 @@
 		948986691BE5CFB000D34976 /* CodeChallengeType.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = CodeChallengeType.swift; sourceTree = "<group>"; };
 		9489866F1BE5D28500D34976 /* ExampleCodeChallenge.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = ExampleCodeChallenge.swift; sourceTree = "<group>"; };
 		94FB98C91BE1B5D800228845 /* TwoSumChallenge.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = TwoSumChallenge.swift; sourceTree = "<group>"; };
+		D5D15B351E0C966A00CC9B1C /* felixdumitClockEntry.swift */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.swift; path = felixdumitClockEntry.swift; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -117,6 +119,7 @@
 				2EB83A7F1E03290400FAAB32 /* EthanSchatzline-ClockEntry.swift */,
 				1B31586E1E02FC7E0052ACBD /* FlavioSilverioClockEntry.swift */,
 				7B925E511E05AFFF0009B0CD /* matthijsClockEntry.swift */,
+				D5D15B351E0C966A00CC9B1C /* felixdumitClockEntry.swift */,
 			);
 			path = Entries;
 			sourceTree = "<group>";
@@ -377,6 +380,7 @@
 				94350F741BE5F04A003592FB /* IanKeen.swift in Sources */,
 				94350F761BE5F0F6003592FB /* Logan.swift in Sources */,
 				94350F721BE5EF9F003592FB /* BugKrusha.swift in Sources */,
+				D5D15B361E0C966A00CC9B1C /* felixdumitClockEntry.swift in Sources */,
 				809B704A1BF01B68004131BE /* LoganWrightEntry.swift in Sources */,
 				944CFCD81BE72B3C00FD2E41 /* LetterCombinationsOfPhoneNumberChallenge.swift in Sources */,
 				94350F691BE5EB90003592FB /* Aranasaurus.swift in Sources */,

CodeChallenge/Challenges/Clock/Clock.swift

@@ -35,7 +35,8 @@ struct ClockChallenge: CodeChallengeType {
         FlavioSilverioClockEntry,
         ethanSchatzlineClockEntry,
         brandonShegaClockEntry,
-        matthijsClockEntry
+        matthijsClockEntry,
+        felixdumitClockEntry
     ]
 
     func verifyOutput(_ output: (hourHandeAnlge: Int, minuteHandAngle: Int, secondHandAngle: Int), forInput input: String) -> Bool {

CodeChallenge/Challenges/Clock/Entries/felixdumitClockEntry.swift

@@ -0,0 +1,81 @@
+//
+//  felixdumitClockEntry.swift
+//  CodeChallenge
+//
+//  Created by Felix Dumit on 12/22/16.
+//  Copyright © 2016 iosdevelopers. All rights reserved.
+//
+
+import Foundation
+
+private var dateFormatter: DateFormatter = {
+    let df = DateFormatter()
+    df.dateFormat = "HH:mm:ss"
+    return df
+}()
+
+let felixdumitClockEntry = CodeChallengeEntry<ClockChallenge>(name: "felix-dumit") { input in
+    if #available(iOS 10.0, *) {
+
+        guard let date = dateFormatter.date(from: input) else {
+            fatalError("bad input")
+        }
+
+        func duration(for component: Calendar.Component) -> Measurement<UnitDuration> {
+            let cmp = NSCalendar.current.component(component, from: date)
+            return Measurement<UnitDuration>(value: Double(cmp), unit: component.durationUnit!)
+        }
+
+        let totalDuration = duration(for: .hour) + duration(for: .minute) + duration(for: .second)
+
+        func clockAngle(unit: UnitDuration) -> Int {
+            let percent = (totalDuration % unit.durationForClockFullTurn) / unit.durationForClockFullTurn
+            return Int(360 * percent)
+        }
+
+        return (clockAngle(unit: .hours), clockAngle(unit: .minutes), clockAngle(unit: .seconds))
+
+    } else {
+        fatalError("this solution is only available for iOS10")
+    }
+}
+
+@available(iOS 10.0, *)
+private func /<D:Dimension>(lhs: Measurement<D>, rhs: Measurement<D>) -> Double {
+    return lhs.converted(to: D.baseUnit()).value / rhs.converted(to: D.baseUnit()).value
+}
+
+@available(iOS 10.0, *)
+private func %<D:Dimension>(lhs: Measurement<D>, rhs: Measurement<D>) -> Measurement<D> {
+    let value = lhs.converted(to: D.baseUnit()).value
+        .truncatingRemainder(dividingBy: rhs.converted(to: D.baseUnit()).value)
+    return Measurement(value: value, unit: D.baseUnit())
+}
+
+@available(iOS 10.0, *)
+private extension UnitDuration {
+    var durationForClockFullTurn: Measurement<UnitDuration> {
+        switch self {
+        case UnitDuration.hours:
+            return Measurement<UnitDuration>(value:12, unit: .hours)
+        case UnitDuration.minutes:
+            return Measurement<UnitDuration>(value:1, unit: .hours)
+        case UnitDuration.seconds:
+            return Measurement<UnitDuration>(value: 1, unit: .minutes)
+        default: //should not happen
+            return Measurement<UnitDuration>(value: 0, unit: .seconds)
+        }
+    }
+}
+
+@available(iOS 10.0, *)
+private extension Calendar.Component {
+    var durationUnit: UnitDuration? {
+        switch self {
+        case .hour: return .hours
+        case .minute: return .minutes
+        case .second: return .seconds
+        default: return nil
+        }
+    }
+}