#include "DataOutputLayer.h"
#include "DataFormatter.h"
#include "CommandlineInterface.h"
#include <ostream>
#include <fstream>
#include <iostream>

using namespace IO;

void DataOutputLayer::Init() {

  // Set our ostream
  switch (Configuration::outputTo) {

    // Are we writing to stdout?
    case Configuration::OUTPUT_TO::STDOUT:

      // Redirect our ostream to stdout
      out = &std::cout;
      break;

    // Are we writing to a file?
    case Configuration::OUTPUT_TO::FILE:

      // Open the file
      ofs.open(
        Configuration::inputFilename,
        std::ios::out | std::ios::binary
      );

      // A little bit of error handling
      if (!ofs.good()) {
        throw std::runtime_error("Unable to open outfilestream!");
      }

      // Redirect our ostream to this outfilestream
      out = &ofs;
      break;
  }

  // Determine which iobase format to write in
  // If we are decrypting, input is not formatted
  if (Configuration::activeModule == Configuration::MODULE::DECRYPTION) {
    outFormat = Configuration::IOBASE_FORMAT::BASE_BYTES;
  }
  // If we are doing anything else, output is the requested format
  else {
    outFormat = Configuration::iobaseFormat;
  }

  initialized = true;
  reachedEof = false;

  return;

}

void DataOutputLayer::Destruct() {
  if (Configuration::outputTo == Configuration::OUTPUT_TO::FILE) {
    ofs.close();
  }

  return;
}

void DataOutputLayer::Enqueue(const Block& block) {
  blocks.emplace(block);
  return;
}

void DataOutputLayer::WriteBlock() {
  // Some error checking
  if (!initialized) {
    throw std::runtime_error("Attempted to write on uninitialized DataOutputLayer!");
  }

  // Check if we have any block to write
  // and if we should (output-puffering)
  // Basically: only output if we have anything to output, and
  //   if --puffer-output is given, only output once we have reachedEof.
  if (
      (blocks.size() > 0) &&
      (
        (!CommandlineInterface::Get().HasParam("--puffer-output")) ||
        (reachedEof)
      )
  ) {

    // Fetch the block to write
    const Block block = blocks.front();
    blocks.pop();

    // Recode it to our output format
    const std::string formattedBlock =
      DataFormatter::FormatBlock(
        block,
        outFormat
      );

    // Dump it
    *out << formattedBlock;

    // If this is not the last block, and the used iobase set
    // requires it, append a seperator
    if (
        (!IsFinished()) &&
        (
         (outFormat == Configuration::IOBASE_FORMAT::BASE_UWU) ||
         (outFormat == Configuration::IOBASE_FORMAT::BASE_UGH)
        )
    ) {
      *out << " ";
    }

  }

  return;
}

void DataOutputLayer::ReachedEOF() {
  reachedEof = true;
  return;
}

bool DataOutputLayer::IsFinished() {
  return (reachedEof) && (blocks.size() == 0);
}

std::ostream* DataOutputLayer::out;
std::ofstream DataOutputLayer::ofs;
bool DataOutputLayer::reachedEof = false;
bool DataOutputLayer::initialized = false;
Configuration::IOBASE_FORMAT DataOutputLayer::outFormat;
std::queue<Block> DataOutputLayer::blocks;