#pragma once
#include <chrono>
#include <imgui.h>

 struct EngineStatistics {
	float frameTime;
	uint32_t verts;
	uint32_t DC;

	long long lastSampleTime;
	long long frames;
	long long  FPS;
};
extern EngineStatistics ES;

inline void PerfomanceSamplerInit(){

	ES.frames = 0;
	ES.lastSampleTime = 0;
	ES.lastSampleTime = std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::high_resolution_clock::now().time_since_epoch()).count();
	
}

inline void SamplePerformance(void) {
	ES.frames++; 
	ES.DC = 0; 
	ES.verts = 0; 
	unsigned long long  now = std::chrono::duration_cast<std::chrono::milliseconds>(std::chrono::high_resolution_clock::now().time_since_epoch()).count(); 
	unsigned long long MilliSecondsPast = now - ES.lastSampleTime; 
	if (MilliSecondsPast >= 1000) {
			
			ES.frameTime = (float)1000 / ES.frames; 
			ES.FPS = ES.frames; 
			ES.frames = 0; 
			ES.lastSampleTime = now; 
	}
}



inline void ShowStats() {
	ImGui::Begin("Statistics", false, ImGuiWindowFlags_NoCollapse | ImGuiWindowFlags_NoResize | ImGuiWindowFlags_NoMove);

	ImGui::Text("FPS: %i",			ES.FPS);
	ImGui::Text("Frame Time: %f",	ES.frameTime);
	ImGui::Text("Verts: %i",			ES.verts);
	ImGui::Text("Draw Calls: %i",	ES.DC);


	ImGui::End();

}