#include "quam/wad2.h"

namespace Wad2 {
	enum Compression {
		CompressNone,
		CompressLZSS,
	};
}

static Arc::FileType getFileType(int n) {
	switch(n) {
		case 0:  return Arc::FileType::Normal;
		case 1:  return Arc::FileType::Label;
		case 64: return Arc::FileType::Palette;
		case 65: return Arc::FileType::Texture;
		case 66: return Arc::FileType::Picture;
		case 67: return Arc::FileType::Sound;
		case 68: return Arc::FileType::MipTexture;
		default: throw EnumError("invalid file type");
	}
}

static std::pair<quint32, quint32> readWad2Header(std::istream &st) {
	auto magic = readBytes<4>(st);

	if(magic != std::array{'W', 'A', 'D', '2'}) {
		throw FileFormatError("not a wad2 file (invalid magic number)");
	}

	auto dirNum    = readLE<quint32>(st);
	auto dirOffset = readLE<quint32>(st);
	return std::make_pair(dirOffset, dirNum);
}

static Arc::File readWad2Entry(std::istream &st) {
	auto entOffset = readLE<quint32>(st);
	auto entSize   = readLE<quint32>(st);
	auto entCSize  = readLE<quint32>(st);
	auto entType   = readByte(st);
	auto entCompr  = readByte(st);
	/*   padding  */ readBytes<2>(st);
	auto entName   = readBytes<16>(st);

	if(entSize != entCSize || entCompr != Wad2::CompressNone) {
		throw UnimplementedError("compressed files not supported");
	}

	auto pos = st.tellg();

	st.seekg(entOffset);

	QByteArray data;

	data.resize(entSize);
	st.read(data.data(), entSize);
	st.seekg(pos);

	Arc::File file{ntbsToString(entName), std::move(data)};
	file.type = getFileType(entType);
	return file;
}

Arc::Dir readWad2(std::istream &st) {
	auto hdr = readWad2Header(st);
	st.seekg(hdr.first);

	Arc::Dir root{std::string{}};

	for(quint32 i = 0; i < hdr.second; i++) {
		root.emplaceBack(new Arc::File(readWad2Entry(st)));
	}

	return root;
}

Wad2Validator::Wad2Validator(QObject *parent) :
	QValidator{parent}
{
}

QValidator::State Wad2Validator::validate(QString &input, int &pos) const {
	return QValidator::Acceptable;
}

// EOF