2 files changed, 59 insertions, 0 deletions
diff --git a/src/entity.c b/src/entity.c
index 919da95..70a7db5 100644
--- a/src/entity.c
+++ b/src/entity.c
@@ -16,6 +16,7 @@ Entity createEntity(EntityId id, Vector3 position)
 {
   Entity entity;
   entity.id = id;
+  entity.state = ENTITY_DEFAULT_STATE;
 
   // Bounding boxes.
   switch (id)
@@ -213,3 +214,32 @@ void placeEntityOnGround(Entity* entity, const World* world)
 
   setEntityPosition(entity, position);
 }
+
+
+InteractionCommand interactWithOldMint(Entity* entity, Game* game,
+                                       Selection selection)
+{
+  if (selection == SELECTION_INTERACT)
+  {
+    // Run display message code.
+    return INTERACTION_TALK;
+  }
+  else
+  {
+    return INTERACTION_END;
+  }
+}
+
+InteractionCommand interactWithEntity(Entity* entity, Game* game,
+                                      Selection selection)
+{
+  switch (entity->id)
+  {
+  case OLD_MINT: // For testing.
+    return interactWithOldMint(entity, game, selection);
+  default:
+    break;
+  }
+  
+  return INTERACTION_END;
+}
diff --git a/src/entity.h b/src/entity.h
index 9c842d3..72fadb4 100644
--- a/src/entity.h
+++ b/src/entity.h
@@ -40,7 +40,12 @@
 #define SHOPKEEPER_HEIGHT (2.59521 / 2.0)
 #define SHOPKEEPER_THICKNESS (0.493349 / 2.0)
 
+#define INTERACTION_MENU_MAX 9
+#define INTERACTION_LABEL_MAX 64
+#define ENTITY_DEFAULT_STATE -1
+
 typedef int8_t EntityId;
+typedef int8_t EntityState;
 
 enum {
   ENTITY_NONE = -1,
@@ -60,15 +65,39 @@ enum {
   RON
 };
 
+typedef enum {
+  INTERACTION_TALK,
+  INTERACTION_SHOW_MENU,
+  INTERACTION_END
+} InteractionCommand;
+
+typedef enum {
+  SELECTION_INTERACT,
+  SELECTION_NEXT_MESSAGE,
+  SELECTION_MENU_ITEM, // +x to select any given menu entry
+  SELECTION_LEAVE
+} Selection;
+
 typedef struct {
   EntityId id;
   Vector3 position; // Shouldnt be changed directly.
   BoundingBox box;
+  EntityState state;
 } Entity;
 
+typedef void (*InteractionCallback)(Entity* entity, Game* game);
+
+typedef struct {
+  char label[INTERACTION_LABEL_MAX];
+  InteractionCallback callback;
+} InteractionMenuEntry;
+
 Entity createEntity(EntityId id, Vector3 position);
 void updateEntity(Entity* entity, Game* game);
 void setEntityPosition(Entity* entity, Vector3 position);
 void placeEntityOnGround(Entity* entity, const World* world);
 
+InteractionCommand interactWithEntity(Entity* entity, Game* game,
+                                      Selection selection);
+
 #endif