#include "buffer.hpp"
#include <iomanip>
#include <iostream>

namespace llarp
{
  std::string
  buffer_printer::ToString() const
  {
    auto& b = buf;
    std::string out;
    auto ins = std::back_inserter(out);
    fmt::format_to(ins, "Buffer[{}/{:#x} bytes]:", b.size(), b.size());

    for (size_t i = 0; i < b.size(); i += 32)
    {
      fmt::format_to(ins, "\n{:04x} ", i);

      size_t stop = std::min(b.size(), i + 32);
      for (size_t j = 0; j < 32; j++)
      {
        auto k = i + j;
        if (j % 4 == 0)
          out.push_back(' ');
        if (k >= stop)
          out.append("  ");
        else
          fmt::format_to(ins, "{:02x}", std::to_integer<uint_fast16_t>(b[k]));
      }
      out.append(u8"  ┃");
      for (size_t j = i; j < stop; j++)
      {
        auto c = std::to_integer<char>(b[j]);
        if (c == 0x00)
          out.append(u8"∅");
        else if (c < 0x20 || c > 0x7e)
          out.append(u8"·");
        else
          out.push_back(c);
      }
      out.append(u8"┃");
    }
    return out;
  }
}  // namespace llarp