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+#ifndef COLLISION_H_53D84877
+#define COLLISION_H_53D84877
+
+#include "entity_manager.h"
+#include "direction.h"
+
+class Collision {
+public:
+
+  using id_type = EntityManager::id_type;
+
+  // Types are defined in descending priority order
+  enum class Type {
+    wall,
+    platform,
+    adjacency,
+    warp,
+    danger
+  };
+
+  Collision(
+    id_type collider,
+    Direction dir,
+    Type type,
+    int axis,
+    double lower,
+    double upper) :
+      collider_(collider),
+      dir_(dir),
+      type_(type),
+      axis_(axis),
+      lower_(lower),
+      upper_(upper)
+  {
+  }
+
+  inline id_type getCollider() const
+  {
+    return collider_;
+  }
+
+  inline Direction getDirection() const
+  {
+    return dir_;
+  }
+
+  inline Type getType() const
+  {
+    return type_;
+  }
+
+  inline int getAxis() const
+  {
+    return axis_;
+  }
+
+  inline double getLower() const
+  {
+    return lower_;
+  }
+
+  inline double getUpper() const
+  {
+    return upper_;
+  }
+
+  bool operator<(const Collision& other) const;
+
+  bool isColliding(double x, double y, int w, int h) const;
+
+private:
+
+  id_type collider_;
+  Direction dir_;
+  Type type_;
+  int axis_;
+  double lower_;
+  double upper_;
+};
+
+#endif /* end of include guard: COLLISION_H_53D84877 */