#ifndef WC3RE_UTIL_HH__
#define WC3RE_UTIL_HH__

#include <cstdint>
#include <string>

#ifdef WIN32
#define NOMINMAX
#include <Windows.h>
#endif

#include "common.hh"
#include "Resource.hh"

class MmapFile : public Resource {
public:
  MmapFile(std::string fileName);
  MmapFile(MmapFile const& copy) = delete;
  MmapFile(MmapFile && move);
  
  ~MmapFile() override;

  MmapFile& operator=(MmapFile const& copy) = delete;
  MmapFile& operator=(MmapFile && move);

  std::string const& name() const;
  size_t size() const override;
  uint8_t const* data() const override;

  operator bool() const override;

  size_t footprint() const {
    return sizeof(MmapFile)+name_.capacity()+sizeof(FILE);
  }
private:
  std::string name_;
#ifndef WIN32
  FILEUPtr fd_;
#else
  HANDLE file_hnd_, fm_hnd_;
#endif
  size_t size_;
  void *base_;
};

// Helper functions to read big endian numbers
uint16_t readU16BE(uint8_t const* data);
uint32_t readU24BE(uint8_t const* data);
uint32_t readU32BE(uint8_t const* data);

// Helper functions to read little endian numbers
uint16_t readU16LE(uint8_t const* data);
uint32_t readU24LE(uint8_t const* data);
uint32_t readU32LE(uint8_t const* data);

// Sign-extend b starting at msb
int sextend(unsigned b, unsigned msb);

// Load simple resource from file
std::string fileToString(std::string const& name);

class BitReader {
public:
  BitReader(uint8_t const* data, size_t len);

  unsigned getBits(unsigned count);
  unsigned getBit();
  
private:
  uint8_t const* data_;
  size_t len_, pos_;
  uint8_t buf_;
  unsigned bufValid_;
};
#endif