implement different kinds of power ups (two bullet types not implemented yet)

tanks-backend/TanksServer/GameLogic/CollectPowerUp.cs

@@ -1,3 +1,5 @@
+using System.Diagnostics;
+
 namespace TanksServer.GameLogic;
 
 internal sealed class CollectPowerUp(
@@ -22,15 +24,32 @@ internal sealed class CollectPowerUp(
 
             // now the tank overlaps the power up by at least 0.5 tiles
 
+            switch (obj.Type)
+            {
+                case PowerUpType.MagazineTypeUpgrade:
+                    if (obj.MagazineType == null)
+                        throw new UnreachableException();
+
                     tank.Magazine = tank.Magazine with
                     {
-                UsedBullets = 0,
-                Type = tank.Magazine.Type | MagazineType.Explosive
+                        Type = tank.Magazine.Type | obj.MagazineType.Value,
+                        UsedBullets = 0
                     };
 
                     if (tank.ReloadingUntil >= DateTime.Now)
                         tank.ReloadingUntil = DateTime.Now;
 
+                    break;
+                case PowerUpType.MagazineSizeUpgrade:
+                    tank.Magazine = tank.Magazine with
+                    {
+                        MaxBullets = (byte)int.Clamp(tank.Magazine.MaxBullets + 1, 1, 32)
+                    };
+                    break;
+                default:
+                    throw new NotImplementedException();
+            }
+
             tank.Owner.Scores.PowerUpsCollected++;
             return true;
         }

tanks-backend/TanksServer/GameLogic/MapEntityManager.cs

@@ -46,7 +46,12 @@ internal sealed class MapEntityManager(
         logger.LogInformation("Tank added for player {}", player.Name);
     }
 
-    public void SpawnPowerUp() => _powerUps.Add(new PowerUp(ChooseSpawnPosition()));
+    public void SpawnPowerUp(PowerUpType type, MagazineType? magazineType) => _powerUps.Add(new PowerUp
+    {
+        Position = ChooseSpawnPosition(),
+        Type = type,
+        MagazineType = magazineType
+    });
 
     public void RemoveWhere(Predicate<PowerUp> predicate) => _powerUps.RemoveWhere(predicate);
 

tanks-backend/TanksServer/GameLogic/SpawnPowerUp.cs

@@ -1,3 +1,5 @@
+using System.Diagnostics;
+
 namespace TanksServer.GameLogic;
 
 internal sealed class SpawnPowerUp(
@@ -15,7 +17,25 @@ internal sealed class SpawnPowerUp(
         if (Random.Shared.NextDouble() > _spawnChance * delta.TotalSeconds)
             return ValueTask.CompletedTask;
 
-        entityManager.SpawnPowerUp();
+
+        var type = Random.Shared.Next(10) < 3
+            ? PowerUpType.MagazineSizeUpgrade
+            : PowerUpType.MagazineTypeUpgrade;
+
+        MagazineType? magazineType = type switch
+        {
+            PowerUpType.MagazineTypeUpgrade => Random.Shared.Next(0, 4) switch
+            {
+                0 => MagazineType.Fast,
+                1 => MagazineType.Explosive,
+                2 => MagazineType.Smart,
+                3 => MagazineType.Mine,
+                _ => throw new UnreachableException()
+            },
+            _ => null
+        };
+
+        entityManager.SpawnPowerUp(type, magazineType);
         return ValueTask.CompletedTask;
     }
 }

tanks-backend/TanksServer/Models/IMapEntity.cs

@@ -2,7 +2,7 @@ namespace TanksServer.Models;
 
 internal interface IMapEntity
 {
-    FloatPosition Position { get; set; }
+    FloatPosition Position { get; }
 
     PixelBounds Bounds { get; }
 }

tanks-backend/TanksServer/Models/PowerUp.cs

@@ -2,9 +2,19 @@ using TanksServer.GameLogic;
 
 namespace TanksServer.Models;
 
-internal sealed class PowerUp(FloatPosition position): IMapEntity
+internal enum PowerUpType
 {
-    public FloatPosition Position { get; set; } = position;
+    MagazineTypeUpgrade,
+    MagazineSizeUpgrade
+}
+
+internal sealed class PowerUp: IMapEntity
+{
+    public required FloatPosition Position { get; init; }
 
     public PixelBounds Bounds => Position.GetBoundsForCenter(MapService.TileSize);
+
+    public required PowerUpType Type { get; init; }
+
+    public MagazineType? MagazineType { get; init; }
 }