#include <algorithm>

#include "PaletteDecoder.hh"
#include "exceptions.hh"

PaletteDecoder::PaletteDecoder(uint8_t const* base, size_t length)
  : iff_(base, length)
{
  auto& root = iff_.getRoot();
  if (!root.isForm())
    throw FormatException{"Root node not FORM"};

  auto& rootForm = dynamic_cast<IffFile::Form const&>(root);
  if (rootForm.getSubtype() != "PALT")
    throw FormatException{"Root form not PALT"};

  for (auto paltIt = rootForm.childrenBegin();paltIt != rootForm.childrenEnd();++paltIt) {
    if (paltIt->getType() == "INFO") {
    } else if (paltIt->getType() == "PALT") {
      std::transform(paltIt->begin()+4, paltIt->begin()+772,
		     palette_.begin(),
		     [](const char& in) -> uint8_t {return (in << 2) | ((in >> 6)&0x3);});
    }
  }
}