#include "Utility.hpp"

#include <thread>

#include <optick.h>
#include <easylogging++.h>

GLenum glCheckError_(const char *file, int line) {
	OPTICK_EVENT();
    GLenum errorCode;
    while ((errorCode = glGetError()) != GL_NO_ERROR) {
        std::string error;
        switch (errorCode) {
            case GL_INVALID_ENUM:
                error = "INVALID_ENUM";
                break;
            case GL_INVALID_VALUE:
                error = "INVALID_VALUE";
                break;
            case GL_INVALID_OPERATION:
                error = "INVALID_OPERATION";
                break;
            case GL_STACK_OVERFLOW:
                error = "STACK_OVERFLOW";
                break;
            case GL_STACK_UNDERFLOW:
                error = "STACK_UNDERFLOW";
                break;
            case GL_OUT_OF_MEMORY:
                error = "OUT_OF_MEMORY";
                break;
            case GL_INVALID_FRAMEBUFFER_OPERATION:
                error = "INVALID_FRAMEBUFFER_OPERATION";
                break;
        }
        static int t = 0;
        LOG(ERROR) << "OpenGL error: " << error << " at " << file << ":" << line;
    }
    return errorCode;
}

LoopExecutionTimeController::LoopExecutionTimeController(duration delayLength)
        : delayLength(delayLength) {
    previousUpdate = clock::now();
}

LoopExecutionTimeController::~LoopExecutionTimeController() {

}

void LoopExecutionTimeController::SetDelayLength(duration length) {
    delayLength = length;
}

unsigned long long LoopExecutionTimeController::GetIterations() {
    return iterations;
}

void LoopExecutionTimeController::Update() {
    iterations++;
    auto timeToSleep = delayLength - GetDelta();    
    if (timeToSleep.count() > 0)
        std::this_thread::sleep_for(timeToSleep);
    previousPreviousUpdate = previousUpdate;
    previousUpdate = clock::now();    
}

double LoopExecutionTimeController::GetDeltaMs() {
    std::chrono::duration<double, std::milli> delta = GetDelta();    
    return delta.count();
}

LoopExecutionTimeController::duration LoopExecutionTimeController::GetDelta() {
    auto now = clock::now();
    return duration(now-previousUpdate);
}

double LoopExecutionTimeController::GetDeltaS() {
    std::chrono::duration<double, std::ratio<1,1>> delta = GetDelta();
    return delta.count();
}

double LoopExecutionTimeController::GetRealDeltaS() {
    return std::chrono::duration<double,std::ratio<1,1>>(previousUpdate - previousPreviousUpdate).count();
}

double LoopExecutionTimeController::RemainTimeMs() {
    auto remain = delayLength - GetDelta();
    return remain.count();
}