#include "src/PerfCounter.h"
#include <imgui.h>
#include <iostream>

EngineStatistics ES;

uint64_t EngineInstrumentation::GetPrecisionTime() {
	using namespace std::chrono; // REMINDER: This is kinda ugly but safes line width
	return duration_cast<milliseconds>(high_resolution_clock::now().time_since_epoch()).count();
}

void EngineInstrumentation::PerfomanceSamplerInit() {
	ES.frames = 0;
	//EngineInstrumentation::lastSampleTime = GetPrecisionTime();
}



void EngineInstrumentation::Update() {
/*
uint64_t MilliSecondsPast = GetPrecisionTime() - EngineInstrumentation::lastSampleTime;

	if (MilliSecondsPast >= 1000) {

		ES.frameTime = (float)1000 / ES.frames;
		ES.FPS = ES.frames;
		ES.frames = 0;
		//EngineInstrumentation::lastSampleTime = GetPrecisionTime();
	}
*/	
	
}

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

	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();
}


PerfSampler::PerfSampler(const std::string& name ) 
: name(name)
{
	using namespace std::chrono;
	startTime = high_resolution_clock::now();
	
}

PerfSampler::~PerfSampler()
{
	Stop();
}

void PerfSampler::Stop()
{
	using namespace std::chrono;
	auto end = high_resolution_clock::now();
	auto durationInuSeconds = 
		duration_cast<nanoseconds>(end.time_since_epoch()).count() - 
		duration_cast<nanoseconds>(startTime.time_since_epoch()).count();

	auto ms = durationInuSeconds * 0.001f;

	std::cout << "[" << name << "]" <<  "Took: " << durationInuSeconds << " us (" << ms << " ms)" << std::endl;
}