Simplify Combat (C#) folder structure

28_Combat/csharp/Controller.cs

@@ -0,0 +1,102 @@
+using System;
+
+namespace Game
+{
+    /// <summary>
+    /// Contains functions for interacting with the user.
+    /// </summary>
+    public class Controller
+    {
+        /// <summary>
+        /// Gets the player's initial armed forces distribution.
+        /// </summary>
+        /// <param name="computerForces">
+        /// The computer's initial armed forces.
+        /// </param>
+        public static ArmedForces GetInitialForces(ArmedForces computerForces)
+        {
+            var playerForces = default(ArmedForces);
+
+            // BUG: This loop allows the player to assign negative values to
+            //  some branches, leading to strange results.
+            do
+            {
+                View.ShowDistributeForces();
+
+                View.PromptArmySize(computerForces.Army);
+                var army = InputInteger();
+
+                View.PromptNavySize(computerForces.Navy);
+                var navy = InputInteger();
+
+                View.PromptAirForceSize(computerForces.AirForce);
+                var airForce = InputInteger();
+
+                playerForces = new ArmedForces
+                {
+                    Army     = army,
+                    Navy     = navy,
+                    AirForce = airForce
+                };
+            }
+            while (playerForces.TotalTroops > computerForces.TotalTroops);
+
+            return playerForces;
+        }
+
+        /// <summary>
+        /// Gets the military branch for the user's next attack.
+        /// </summary>
+        public static MilitaryBranch GetAttackBranch(WarState state, bool isFirstTurn)
+        {
+            if (isFirstTurn)
+                View.PromptFirstAttackBranch();
+            else
+                View.PromptNextAttackBranch(state.ComputerForces, state.PlayerForces);
+
+            // If the user entered an invalid branch number in the original
+            // game, the code fell through to the army case.  We'll preserve
+            // that behaviour here.
+            return Console.ReadLine() switch
+            {
+                "2" => MilitaryBranch.Navy,
+                "3" => MilitaryBranch.AirForce,
+                _   => MilitaryBranch.Army
+            };
+        }
+
+        /// <summary>
+        /// Gets a valid attack size from the player for the given branch
+        /// of the armed forces.
+        /// </summary>
+        /// <param name="troopsAvailable">
+        /// The number of troops available.
+        /// </param>
+        public static int GetAttackSize(int troopsAvailable)
+        {
+            var attackSize = 0;
+
+            do
+            {
+                View.PromptAttackSize();
+                attackSize = InputInteger();
+            }
+            while (attackSize < 0 || attackSize > troopsAvailable);
+
+            return attackSize;
+        }
+
+        /// <summary>
+        /// Gets an integer value from the user.
+        /// </summary>
+        public static int InputInteger()
+        {
+            var value = default(int);
+
+            while (!Int32.TryParse(Console.ReadLine(), out value))
+                View.PromptValidInteger();
+
+            return value;
+        }
+    }
+}