#include "wxutils.h"

#include "utils.h"
#define BUFSIZE 1024
#define JPEG0 0xFF
#define JPEG1 0xD8
#define JPEG2 0xFF
#define PNG0 0x89
#define PNG1 0x50
#define PNG2 0x4E
#define BMP0 0x42
#define BMP1 0x4D
#define GIF0 0x47
#define GIF1 0x49
#define GIF2 0x46
namespace wxhelper {
namespace wxutils {
#ifdef _WIN64
int64_t GetWeChatWinBase() {
  return (int64_t)GetModuleHandleA("WeChatWin.dll");
}
#else
int32_t GetWeChatWinBase() {
  return (int32_t)GetModuleHandleA("WeChatWin.dll");
}
#endif

std::string ReadSKBuiltinString(INT64 addr) {
  INT64 inner_string = *(INT64 *)(addr + 0x8);
  if (inner_string == 0) {
    return std::string();
  }
  return ReadWeChatStr(inner_string);
}

std::string ReadSKBuiltinBuffer(INT64 addr) {
  INT64 len = *(INT64 *)(addr + 0x10);
  if (len == 0) {
    return std::string();
  }
  INT64 inner_string = *(INT64 *)(addr + 0x8);
  if (inner_string == 0) {
    return std::string();
  }
  return ReadWeChatStr(inner_string);
}

std::string ReadWeChatStr(INT64 addr) {
  INT64 len = *(INT64 *)(addr + 0x10);
  if (len == 0) {
    return std::string();
  }
  INT64 max_len = *(INT64 *)(addr + 0x18);
  if ((max_len | 0xF) == 0xF) {
    return std::string((char *)addr, len);
  }
  char *char_from_user = *(char **)(addr);
  return std::string(char_from_user, len);
}

std::string ImageXor(std::string buf) {
  const char *origin = buf.c_str();
  short key = 0;
  if ((*origin ^ JPEG0) == (*(origin + 1) ^ JPEG1)) {
    key = *origin ^ JPEG0;
  } else if ((*origin ^ PNG1) == (*(origin + 1) ^ PNG2)) {
    key = *origin ^ PNG1;
  } else if ((*origin ^ GIF0) == (*(origin + 1) ^ GIF1)) {
    key = *origin ^ GIF0;
  } else if ((*origin ^ BMP0) == (*(origin + 1) ^ BMP1)) {
    key = *origin ^ BMP0;
  } else {
    key = -1;
  }
  if (key > 0) {
    char *img_buf = new char[buf.size()];
    for (unsigned int i = 0; i < buf.size(); i++) {
      img_buf[i] = *(origin + i) ^ key;
    }
    std::string str(img_buf);
    delete[] img_buf;
    img_buf = NULL;
    return str;
  }
  return std::string();
}

std::wstring ReadWstring(INT64 addr) {
  DWORD len = *(DWORD *)(addr + 0x8);
  if (len == 0) {
    return std::wstring();
  }
  wchar_t *str = *(wchar_t **)(addr);
  if (str == NULL) {
    return std::wstring();
  }
  return std::wstring(str, len);
}
std::string ReadWstringThenConvert(INT64 addr) {
  std::wstring wstr = ReadWstring(addr);
  return base::utils::WstringToUtf8(wstr);
}

int DecodeImage(const wchar_t *file_path, const wchar_t *save_dir) {
  return -1;
}


}  // namespace wxutils
}  // namespace wxhelper