[add]: State manager

1 files changed, 82 insertions, 0 deletions

diff --git a/src/Core/StateManager.cpp b/src/Core/StateManager.cpp
new file mode 100644
index 0000000..30d6b1d
--- /dev/null
+++ b/src/Core/StateManager.cpp
@@ -0,0 +1,82 @@
+#include "StateManager.h"
+#include "Log.h"
+
+namespace Donut
+{
+    void StateManager::Shutdown()
+    {
+        if (m_CurrentState)
+            m_CurrentState->OnExit();
+            
+        DestroyStates();
+        DONUT_INFO("StateManager shutdown");
+    }
+
+    void StateManager::DestroyStates()
+    {
+        m_States.clear();
+        m_CurrentState = nullptr;
+        m_CurrentStateName = "";
+    }
+
+    void StateManager::RegisterState(const std::string& stateName, std::unique_ptr<State> state)
+    {
+        if (m_States.find(stateName) != m_States.end())
+            DONUT_WARN("State '{}' already exists, overwriting", stateName);
+        m_States[stateName] = std::move(state);
+        DONUT_INFO("Registered state: {}", stateName);
+    }
+
+    void StateManager::SwitchToState(const std::string& stateName)
+    {
+        auto it = m_States.find(stateName);
+        if (it == m_States.end())
+        {
+            DONUT_ERROR("Attempted to switch to unknown state: {}", stateName);
+            return;
+        }
+
+        State* newState = it->second.get();
+        if (newState == m_CurrentState)
+            return;
+
+        if (m_CurrentState)
+            m_CurrentState->OnExit();
+
+        m_CurrentState = newState;
+        m_CurrentStateName = stateName;
+        m_CurrentState->OnEnter();
+        DONUT_INFO("Switched to state: {}", stateName);
+    }
+
+    State* StateManager::GetState(const std::string& stateName)
+    {
+        auto it = m_States.find(stateName);
+        if (it != m_States.end())
+            return it->second.get();
+        return nullptr;
+    }
+
+    bool StateManager::HasState(const std::string& stateName) const
+    {
+        return m_States.find(stateName) != m_States.end();
+    }
+
+    void StateManager::Update(float deltaTime)
+    {
+        if (m_CurrentState)
+            m_CurrentState->OnUpdate(deltaTime);
+    }
+
+    void StateManager::Render()
+    {
+        if (m_CurrentState)
+            m_CurrentState->OnRender();
+    }
+
+    void StateManager::OnEvent(Event& event)
+    {
+        if (m_CurrentState)
+            m_CurrentState->OnEvent(event);
+    }
+}