#ifndef __wxImGuiImpl_H__
#define __wxImGuiImpl_H__

#include "tools.hpp"

#include "contrib/imgui/imgui.h"

#include <wx/wxprec.h>

#include "Globals.h"

#ifndef WX_PRECOMP
#include <wx/wx.h>
#endif

#include <wx/timer.h>
#include <wx/math.h>
#include <wx/window.h>
#include <wx/event.h>
#include <wx/utils.h> 

#include "GLContext.hpp"

// Render Loop
// https://wiki.wxwidgets.org/Making_a_render_loop
class wxImGuiCanvas : public wxWindow
{
public:
	static wxImGuiCanvas* Create(wxWindow *parent,
		wxWindowID id = wxID_ANY,
		const wxPoint& pos = wxDefaultPosition,
		const wxSize& size = wxDefaultSize,
		long style = 0,
		const wxString& name = "");

public:
	wxImGuiCanvas(GLContext *vContext = 0);

	virtual ~wxImGuiCanvas();

	bool CreateGLContext(HDC vHDC);
	void DestroyGLContext(HDC vHDC);
	bool SetCurrent(HDC vHDC);

	// get the HDC used for OpenGL rendering
	HDC GetHDC() const { return m_hDC; }

	void activateRenderLoop(bool on);
	void onIdle(wxIdleEvent& evt);

	void OnPaint(wxPaintEvent& event);
	void OnSize(wxSizeEvent& event);
	void OnChar(wxKeyEvent& event);
	void OnMouseEvent(wxMouseEvent& event);
	void OnKeyDown(wxKeyEvent& event);
	void OnKeyUp(wxKeyEvent& event);

	cVec2 GetCanvasSize() { return m_ScreenSize; }

private: // https://github.com/ocornut/imgui // based on glfw sample
	wxWindow* g_Window;
	float g_MousePos[2];
	bool g_MousePressed[3];
	float g_MouseWheel;
	GLuint g_FontTexture;
	cActionTime g_Time;

	wxTimer	m_timer; // timer

	bool m_RenderLoopOn;

	GLContext *m_GLContext;

private: // https://github.com/ocornut/imgui // based on glfw sample
	bool ImGui_ImplWx_Init(wxWindow* window);
	void ImGui_ImplWx_Shutdown();
	void ImGui_ImplWx_NewFrame(wxWindow* window);

	// Use if you want to reset your rendering device without losing ImGui state.
	void ImGui_ImplWx_InvalidateDeviceObjects();
	bool ImGui_ImplWx_CreateDeviceObjects();

	void ImGui_ImplWx_MouseButtonCallback(wxWindow* window, int button, int action, int mods);
	void ImGui_ImplWx_ScrollCallback(wxWindow* window, double xoffset, double yoffset);
	void ImGui_ImplWx_KeyCallback(wxWindow* window, int key, int scancode, int action, int mods);
	void ImGui_ImplWx_CharCallback(wxWindow* window, unsigned int c);

	static void ImGui_ImplWx_RenderDrawLists(ImDrawData* draw_data);
	static const char* ImGui_ImplWx_GetClipboardText(void* user_data);
	static void ImGui_ImplWx_SetClipboardText(void* user_data, const char* text);

	virtual void OnDrawImGui();

public:

	HDC GetHDC(){ return m_hDC; }

	virtual void OnTimer(wxTimerEvent& event);

private:
	HGLRC m_hrc;// opengl context
	HDC m_hDC;// HDC for this window, we keep it all the time
	
	cVec2 m_ScreenSize;
	cColor m_ClearColor;

protected:
	bool CreateWindow(wxWindow *parent,
		wxWindowID id = wxID_ANY,
		const wxPoint& pos = wxDefaultPosition,
		const wxSize& size = wxDefaultSize,
		long style = 0,
		const wxString& name = "");

	wxDECLARE_NO_COPY_CLASS(wxImGuiCanvas);
	wxDECLARE_EVENT_TABLE();
};

#endif //__wxImGuiImpl_H__