feat: state manager

1 files changed, 39 insertions, 0 deletions

diff --git a/src/core/state_manager.h b/src/core/state_manager.h
new file mode 100644
index 0000000..7d5e734
--- /dev/null
+++ b/src/core/state_manager.h
@@ -0,0 +1,39 @@
+#pragma once
+
+#include <memory>
+#include <string>
+#include <unordered_map>
+
+#include "state.h"
+
+namespace Donut
+{
+    class StateManager
+    {
+    public:
+        ~StateManager() = default;
+        void shutdown();
+        
+        void update(float delta_time);
+        void render();
+        void on_event(Event& event);
+        
+        void register_state(const std::string& state_name, std::unique_ptr<State> state);
+        void switch_to_state(const std::string& state_name);
+
+        std::string get_current_state_name() const { return m_current_state_name; }
+        State* get_current_state()          const { return m_current_state; }
+        
+        State* get_state(const std::string& state_name);
+        bool   has_state(const std::string& state_name) const;
+    private:
+        void create_states();
+        void destroy_states();
+
+    private:
+        State*      m_current_state     = nullptr;
+        std::string m_current_state_name = "";
+        
+        std::unordered_map<std::string, std::unique_ptr<State>> m_states;
+    };
+}