#include "logbook.h"

namespace germanairlinesva_logbook
{
  Logbook::Logbook()
  {
    if (germanairlinesva_util::fileExists(
            XPLANE_PLUGIN_DIRECTORY LOGBOOK)) {
      this->fromFile(XPLANE_PLUGIN_DIRECTORY LOGBOOK);
    } else {
      char header[] = {'V', 'G', 'A', 'L', '\0', 1};
      this->file.resize(6);
      std::memcpy(file.data(), &header, 6);
    }
  }

  void Logbook::fromFile(const std::string &file)
  {
    std::ifstream in(file, std::ifstream::binary);

    // File Header
    char ident[5];
    in.read(ident, 5);
    if (strcmp(ident, "VGAL") != 0) {
      throw std::invalid_argument("Wrong file");
    }
    std::uint8_t version;
    in.read(reinterpret_cast<char *>(&version), 1);

    if (version == 1) {
      return this->readVersion1(in);
    }
  }

  void Logbook::readVersion1(std::ifstream &in)
  {
    in.seekg(0, std::fstream::end);
    std::streampos fileSize = in.tellg();
    in.seekg(0, std::ios::beg);

    this->file.resize(fileSize);
    in.read(reinterpret_cast<char *>(this->file.data()), fileSize);
    in.close();
  }

  void Logbook::addEntry(LogbookEntry entry)
  {
    std::size_t size = file.size();
    file.resize(file.size() + entry.getBinaryLength());
    std::uint8_t *bufPtr = file.data() + size;
    std::memcpy(bufPtr, entry.getBinaryData(), entry.getBinaryLength());
  }

  void Logbook::toFile()
  {
    std::ofstream out(XPLANE_PLUGIN_DIRECTORY LOGBOOK,
                      std::fstream::binary);
    out.write(reinterpret_cast<char *>(this->file.data()), this->file.size());
    out.close();
  }
} // namespace germanairlinesva_logbook