riversong code showcase

Source/Riversong/Game/Demo/DemoCompletedSignal.cs

@@ -0,0 +1,12 @@
+namespace DanieleMarotta.RiversongCodeShowcase
+{
+    public struct DemoCompletedSignal
+    {
+        public float GameTime;
+
+        public DemoCompletedSignal(float gameTime)
+        {
+            GameTime = gameTime;
+        }
+    }
+}

Source/Riversong/Game/Demo/DemoSystem.cs

@@ -0,0 +1,41 @@
+using UnityEngine;
+
+namespace DanieleMarotta.RiversongCodeShowcase
+{
+    [RequiresWorldReadyForUpdate]
+    public class DemoSystem : GameSystem, IUpdatable
+    {
+        [InjectService]
+        private ISignalBus _signalBus;
+
+        [InjectService]
+        private GameConfig _config;
+
+        [InjectService]
+        private World _world;
+
+        private bool _demoCompleted;
+
+        private float _gameTime;
+
+        public DemoSystem(IServiceLocator serviceLocator) : base(serviceLocator)
+        {
+        }
+
+        public void Update()
+        {
+            if (_demoCompleted) return;
+
+            _gameTime += Time.unscaledDeltaTime;
+
+            var populationState = _world.PopulationState;
+            var generalSettings = _config.GeneralSettings;
+
+            if (populationState.Population < generalSettings.PopulationGoal || populationState.Happiness < generalSettings.HappinessGoal) return;
+
+            _demoCompleted = true;
+
+            _signalBus.Raise(new DemoCompletedSignal(_gameTime));
+        }
+    }
+}