Refactor simulation effects and forecast hazards

src/ReactorMaintenance.Simulation/SmokeSpreadEffect.cs

@@ -0,0 +1,35 @@
+namespace ReactorMaintenance.Simulation;
+
+public sealed class SmokeSpreadEffect : IAreaSimulationEffect
+{
+    public CellState[] Apply(LevelState level, CellState[] cells)
+    {
+        var next = cells.ToArray();
+        for (var y = 0; y < level.Height; y++)
+        {
+            for (var x = 0; x < level.Width; x++)
+            {
+                var position = new GridPosition(x, y);
+                var cell = cells[level.Index(position)];
+                if (cell.Hazards.Smoke < 6)
+                    continue;
+
+                SpreadToNeighbors(level, next, position);
+            }
+        }
+
+        return next;
+    }
+
+    private static void SpreadToNeighbors(LevelState level, CellState[] next, GridPosition position)
+    {
+        foreach (var neighbor in position.Neighbors().Where(level.InBounds))
+        {
+            var neighborCell = next[level.Index(neighbor)];
+            if (!neighborCell.IsWalkable || neighborCell.DoorLocked)
+                continue;
+
+            next[level.Index(neighbor)] = neighborCell with { Hazards = neighborCell.Hazards with { Smoke = Rules.Clamp(neighborCell.Hazards.Smoke + 1) } };
+        }
+    }
+}