#include "foot-emulator.h"

#include <fstream>
#include <iostream>

namespace
{

std::vector<uint16_t> read_file(std::istream& stream)
{
  std::vector<uint16_t> buf;

  std::streampos pos = stream.tellg();
  stream.seekg(0, std::ios::end);
  pos = stream.tellg() - pos;
  buf.resize(pos / 2);
  stream.seekg(0, std::ios::beg);

  for (int i = 0; i < buf.size(); i++)
  {
    char value[2] = {0, 0};
    stream.read(value, 2);
    buf[i] = (uint16_t(value[0]) << 8) | (uint16_t(value[1]) & 0xFF);
  }

  return buf;
}

class PrintDevice : public foot::Device
{
public:
  PrintDevice() :
    Device(1)
  {
  }

  void update() override
  {
    uint16_t& value = memory(0);
    if (value != 0)
    {
      std::cout << char(value);
      value = 0;
    }
  }
};

}

int main(int argc, char** argv)
{
  foot::Emulator emu;
  emu.map_device(std::make_unique<PrintDevice>());

  if (argc > 1)
  {
    std::ifstream file(argv[1], std::ios::binary);

    if (!file.is_open())
    {
      std::cerr << "Failed to open file: " << argv[1] << std::endl;
      return 1;
    }

    emu.run(read_file(file));
  }
  else
  {
    std::cout << "Usage: " << argv[0] << " <filename>" << std::endl;
  }

  return 1;
}