/*
 * Copyright 2016 Tobias Frust
 *
 * DetectorModule.cpp
 *
 *  Created on: 29.06.2016
 *      Author: Tobias Frust
 */

#include "DetectorModule.h"
#include "../ConfigReader/ConfigReader.h"

#include <boost/log/trivial.hpp>

#include <exception>
#include <fstream>

void timer_start(std::function<void(int)> func, unsigned int interval, unsigned int max_packets){
    std::thread([func, interval, max_packets]() {
	int packets = 1;
	auto next = std::chrono::high_resolution_clock::now();
        while (true)
        {
            func(packets);

            next += std::chrono::microseconds(packets * interval);
            auto now = std::chrono::high_resolution_clock::now();
            if (now > next) {
        	std::chrono::nanoseconds late = now - next;
        	packets = 1 + (late.count() / interval / 1000);
        	if (packets > max_packets)
        	    packets = max_packets;
            } else {
        	packets = 1;
            }

	    std::this_thread::sleep_until(next);
//            std::this_thread::sleep_for(std::chrono::microseconds(interval));
        }
    }).detach();
}

DetectorModule::DetectorModule(const int detectorID, const std::string& address, const int port, const std::string& configPath) :
   detectorID_{detectorID},
   numberOfDetectorsPerModule_{16},
   index_{0u},
   client_{address, port},
   max_packets_{1000u}{

   if (readConfig(configPath)) {
      throw std::runtime_error("DetectorModule: Configuration file could not be loaded successfully. Please check!");
   }

   sendBuffer_.resize(max_packets_);
   for(auto &it: sendBuffer_) {
      it.resize(numberOfProjectionsPerPacket_ * numberOfDetectorsPerModule_ * sizeof(unsigned short) + sizeof(size_t) + sizeof(short int));
   }

   //read the input data from the file corresponding to the detectorModuleID
   readInput();
   //unsigned int sinoSize = numberOfDetectorsPerModule_*numberOfProjections_;
   //std::copy(((char*)buffer_.data()), ((char*)buffer_.data())+sinoSize*sizeof(unsigned short), sendBuffer_.begin()+sizeof(std::size_t));
   printf("Created %d\n", detectorID);
}

auto DetectorModule::send(int packets = 1) -> void{
   BOOST_LOG_TRIVIAL(debug) << "Detectormodule " << detectorID_ << " :sending udp packet with index " << index_ << ".";
   int numberOfParts = numberOfProjections_/numberOfProjectionsPerPacket_;
//   sendBuffer_[0] = (sizeof(std::size_t))       & 0xff;
//   sendBuffer_[1] = (sizeof(std::size_t) >> 8)  & 0xff;
//   sendBuffer_[2] = (sizeof(std::size_t) >> 16) & 0xff;
//   sendBuffer_[3] = (sizeof(std::size_t) >> 24) & 0xff;
//   sendBuffer_[4] = (sizeof(std::size_t) >> 32) & 0xff;
//   sendBuffer_[5] = (sizeof(std::size_t) >> 40) & 0xff;
//   sendBuffer_[6] = (sizeof(std::size_t) >> 48) & 0xff;
//   sendBuffer_[7] = (sizeof(std::size_t) >> 56) & 0xff;


    struct mmsghdr msg[packets];
    struct iovec msgvec[packets];

    unsigned int hdrSize = sizeof(size_t) + sizeof(short int);
    unsigned int sinoSize = numberOfDetectorsPerModule_ * numberOfProjectionsPerPacket_;

    memset(msg, 0, sizeof(msg));
    memset(msgvec, 0, sizeof(msgvec));
    for (int i = 0; i < packets; i++) {
	unsigned int bufferSizeIndex = index_ % 1000;
	
	char *ptr = sendBuffer_[i].data();

	msgvec[i].iov_base = sendBuffer_[i].data();
	msgvec[i].iov_len = sendBuffer_[i].size();
	msg[i].msg_hdr.msg_iov = &msgvec[i];
	msg[i].msg_hdr.msg_iovlen = 1;
	

	*reinterpret_cast<size_t*>(ptr) = index_ * numberOfParts + partID_;
	*reinterpret_cast<unsigned short*>(ptr + sizeof(size_t)) = partID_;
	memcpy(ptr + hdrSize, buffer_.data() + sinoSize * (bufferSizeIndex * numberOfParts + partID_), sinoSize * sizeof(unsigned short));

	partID_ = (partID_ + 1) % numberOfParts;
	if (partID_ == 0) ++index_;
    }

    client_.msend(packets, msg);
    
   auto ts = std::chrono::high_resolution_clock::now();
   std::chrono::nanoseconds d = ts - ts_;
    counter_ += packets;
   if (d.count() >= 1000000000) {
	printf("Packets %i (%zu bytes, %.3lf GBit/s) in %.3lf ms\n", counter_, sendBuffer_[0].size(), 8. * counter_ * sendBuffer_[0].size() / 1024 / 1024 / 1024, 1. * d.count() / 1000000);
	counter_ = 0;
	ts_ = ts;
   }
}

auto DetectorModule::sendPeriodically(unsigned int timeIntervall) -> void {
   counter_ = 0;
   ips_ = 1000000. / ((double)timeIntervall);
   ts_ = std::chrono::high_resolution_clock::now();

   std::function<void(int)> f = [=](int packets = 1) {
      this->send(packets);
   };
   timer_start(f, timeIntervall, max_packets_);
}

auto DetectorModule::readInput() -> void {
   if(path_.back() != '/')
      path_.append("/");
   //open file
   const std::string filePath = path_ + fileName_ + std::to_string(detectorID_+1) + fileEnding_;
   BOOST_LOG_TRIVIAL(debug) << "DetectorModule: Path = " << filePath;
   std::ifstream input(filePath, std::ios::in | std::ios::binary);
   if(input){
      //allocate memory in vector
      std::streampos fileSize;
      input.seekg(0, std::ios::end);
      fileSize = input.tellg();
      input.seekg(0, std::ios::beg);
      buffer_.resize(fileSize / sizeof(unsigned short));
      input.read((char*) &buffer_[0], fileSize);
   }else{
      throw std::runtime_error("File not found.");
   }
}

auto DetectorModule::readConfig(const std::string& configFile) -> bool {
  ConfigReader configReader = ConfigReader(configFile.data());
  int samplingRate, scanRate;
  if (configReader.lookupValue("numberOfFanDetectors", numberOfDetectors_)
        && configReader.lookupValue("dataInputPath", path_)
        && configReader.lookupValue("dataFileName", fileName_)
        && configReader.lookupValue("dataFileEnding", fileEnding_)
        && configReader.lookupValue("numberOfPlanes", numberOfPlanes_)
        && configReader.lookupValue("samplingRate", samplingRate)
        && configReader.lookupValue("scanRate", scanRate)
        && configReader.lookupValue("numberOfDataFrames", numberOfFrames_)
        && configReader.lookupValue("numberOfProjectionsPerPacket", numberOfProjectionsPerPacket_)
        && configReader.lookupValue("numberOfDetectorsPerModule", numberOfDetectorsPerModule_)) {
     numberOfProjections_ = samplingRate * 1000000 / scanRate;
     return EXIT_SUCCESS;
  }

  return EXIT_FAILURE;
}