#include <cstdint>
#include <iostream>
#include <memory>
#include <vector>
#include <algorithm>

#include "tinyxml2/tinyxml2.h"
#include <logvisor/logvisor.hpp>

#ifndef _WIN32
#include <cstdlib>
#include <sys/stat.h>
#include <sys/file.h>
#include <sys/ioctl.h>
#include <dirent.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/statvfs.h>
#include <cerrno>
#else
#ifndef WIN32_LEAN_AND_MEAN
#define WIN32_LEAN_AND_MEAN 1
#endif
#ifndef NOMINMAX
#define NOMINMAX
#endif
#include <Windows.h>
#include <nowide/args.hpp>
#define strncasecmp _strnicmp
#define strcasecmp _stricmp
#endif

namespace {

uint32_t crc32(const uint8_t * data, uint64_t length, uint32_t seed, uint32_t final) {
  static const uint32_t crc32Table[256] = {
      0x00000000, 0x77073096, 0xEE0E612C, 0x990951BA, 0x076DC419, 0x706AF48F, 0xE963A535, 0x9E6495A3, 0x0EDB8832,
      0x79DCB8A4, 0xE0D5E91E, 0x97D2D988, 0x09B64C2B, 0x7EB17CBD, 0xE7B82D07, 0x90BF1D91, 0x1DB71064, 0x6AB020F2,
      0xF3B97148, 0x84BE41DE, 0x1ADAD47D, 0x6DDDE4EB, 0xF4D4B551, 0x83D385C7, 0x136C9856, 0x646BA8C0, 0xFD62F97A,
      0x8A65C9EC, 0x14015C4F, 0x63066CD9, 0xFA0F3D63, 0x8D080DF5, 0x3B6E20C8, 0x4C69105E, 0xD56041E4, 0xA2677172,
      0x3C03E4D1, 0x4B04D447, 0xD20D85FD, 0xA50AB56B, 0x35B5A8FA, 0x42B2986C, 0xDBBBC9D6, 0xACBCF940, 0x32D86CE3,
      0x45DF5C75, 0xDCD60DCF, 0xABD13D59, 0x26D930AC, 0x51DE003A, 0xC8D75180, 0xBFD06116, 0x21B4F4B5, 0x56B3C423,
      0xCFBA9599, 0xB8BDA50F, 0x2802B89E, 0x5F058808, 0xC60CD9B2, 0xB10BE924, 0x2F6F7C87, 0x58684C11, 0xC1611DAB,
      0xB6662D3D, 0x76DC4190, 0x01DB7106, 0x98D220BC, 0xEFD5102A, 0x71B18589, 0x06B6B51F, 0x9FBFE4A5, 0xE8B8D433,
      0x7807C9A2, 0x0F00F934, 0x9609A88E, 0xE10E9818, 0x7F6A0DBB, 0x086D3D2D, 0x91646C97, 0xE6635C01, 0x6B6B51F4,
      0x1C6C6162, 0x856530D8, 0xF262004E, 0x6C0695ED, 0x1B01A57B, 0x8208F4C1, 0xF50FC457, 0x65B0D9C6, 0x12B7E950,
      0x8BBEB8EA, 0xFCB9887C, 0x62DD1DDF, 0x15DA2D49, 0x8CD37CF3, 0xFBD44C65, 0x4DB26158, 0x3AB551CE, 0xA3BC0074,
      0xD4BB30E2, 0x4ADFA541, 0x3DD895D7, 0xA4D1C46D, 0xD3D6F4FB, 0x4369E96A, 0x346ED9FC, 0xAD678846, 0xDA60B8D0,
      0x44042D73, 0x33031DE5, 0xAA0A4C5F, 0xDD0D7CC9, 0x5005713C, 0x270241AA, 0xBE0B1010, 0xC90C2086, 0x5768B525,
      0x206F85B3, 0xB966D409, 0xCE61E49F, 0x5EDEF90E, 0x29D9C998, 0xB0D09822, 0xC7D7A8B4, 0x59B33D17, 0x2EB40D81,
      0xB7BD5C3B, 0xC0BA6CAD, 0xEDB88320, 0x9ABFB3B6, 0x03B6E20C, 0x74B1D29A, 0xEAD54739, 0x9DD277AF, 0x04DB2615,
      0x73DC1683, 0xE3630B12, 0x94643B84, 0x0D6D6A3E, 0x7A6A5AA8, 0xE40ECF0B, 0x9309FF9D, 0x0A00AE27, 0x7D079EB1,
      0xF00F9344, 0x8708A3D2, 0x1E01F268, 0x6906C2FE, 0xF762575D, 0x806567CB, 0x196C3671, 0x6E6B06E7, 0xFED41B76,
      0x89D32BE0, 0x10DA7A5A, 0x67DD4ACC, 0xF9B9DF6F, 0x8EBEEFF9, 0x17B7BE43, 0x60B08ED5, 0xD6D6A3E8, 0xA1D1937E,
      0x38D8C2C4, 0x4FDFF252, 0xD1BB67F1, 0xA6BC5767, 0x3FB506DD, 0x48B2364B, 0xD80D2BDA, 0xAF0A1B4C, 0x36034AF6,
      0x41047A60, 0xDF60EFC3, 0xA867DF55, 0x316E8EEF, 0x4669BE79, 0xCB61B38C, 0xBC66831A, 0x256FD2A0, 0x5268E236,
      0xCC0C7795, 0xBB0B4703, 0x220216B9, 0x5505262F, 0xC5BA3BBE, 0xB2BD0B28, 0x2BB45A92, 0x5CB36A04, 0xC2D7FFA7,
      0xB5D0CF31, 0x2CD99E8B, 0x5BDEAE1D, 0x9B64C2B0, 0xEC63F226, 0x756AA39C, 0x026D930A, 0x9C0906A9, 0xEB0E363F,
      0x72076785, 0x05005713, 0x95BF4A82, 0xE2B87A14, 0x7BB12BAE, 0x0CB61B38, 0x92D28E9B, 0xE5D5BE0D, 0x7CDCEFB7,
      0x0BDBDF21, 0x86D3D2D4, 0xF1D4E242, 0x68DDB3F8, 0x1FDA836E, 0x81BE16CD, 0xF6B9265B, 0x6FB077E1, 0x18B74777,
      0x88085AE6, 0xFF0F6A70, 0x66063BCA, 0x11010B5C, 0x8F659EFF, 0xF862AE69, 0x616BFFD3, 0x166CCF45, 0xA00AE278,
      0xD70DD2EE, 0x4E048354, 0x3903B3C2, 0xA7672661, 0xD06016F7, 0x4969474D, 0x3E6E77DB, 0xAED16A4A, 0xD9D65ADC,
      0x40DF0B66, 0x37D83BF0, 0xA9BCAE53, 0xDEBB9EC5, 0x47B2CF7F, 0x30B5FFE9, 0xBDBDF21C, 0xCABAC28A, 0x53B39330,
      0x24B4A3A6, 0xBAD03605, 0xCDD70693, 0x54DE5729, 0x23D967BF, 0xB3667A2E, 0xC4614AB8, 0x5D681B02, 0x2A6F2B94,
      0xB40BBE37, 0xC30C8EA1, 0x5A05DF1B, 0x2D02EF8D};

  if (!data)
    return seed;

  uint32_t checksum = seed;
  int pos = 0;

  while (length--)
    checksum = (checksum >> 8) ^ crc32Table[(checksum & 0xFF) ^ data[pos++]];

  return checksum ^ final;
}

logvisor::Module Log("AssetNameParser");

// TODO: Clean this up
#undef bswap16
#undef bswap32
#undef bswap64

/* Type-sensitive byte swappers */
template <typename T>
constexpr T bswap16(T val) {
#if __GNUC__
  return __builtin_bswap16(val);
#elif _WIN32
  return _byteswap_ushort(val);
#else
  return (val = (val << 8) | ((val >> 8) & 0xFF));
#endif
}

template <typename T>
constexpr T bswap32(T val) {
#if __GNUC__
  return __builtin_bswap32(val);
#elif _WIN32
  return _byteswap_ulong(val);
#else
  val = (val & 0x0000FFFF) << 16 | (val & 0xFFFF0000) >> 16;
  val = (val & 0x00FF00FF) << 8 | (val & 0xFF00FF00) >> 8;
  return val;
#endif
}

template <typename T>
constexpr T bswap64(T val) {
#if __GNUC__
  return __builtin_bswap64(val);
#elif _WIN32
  return _byteswap_uint64(val);
#else
  return ((val & 0xFF00000000000000ULL) >> 56) | ((val & 0x00FF000000000000ULL) >> 40) |
         ((val & 0x0000FF0000000000ULL) >> 24) | ((val & 0x000000FF00000000ULL) >> 8) |
         ((val & 0x00000000FF000000ULL) << 8) | ((val & 0x0000000000FF0000ULL) << 24) |
         ((val & 0x000000000000FF00ULL) << 40) | ((val & 0x00000000000000FFULL) << 56);
#endif
}

#if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
constexpr uint32_t SBig(uint32_t val) { return bswap32(val); }
constexpr uint64_t SBig(uint64_t val) { return bswap64(val); }
#ifndef SBIG
#define SBIG(q) (((q)&0x000000FF) << 24 | ((q)&0x0000FF00) << 8 | ((q)&0x00FF0000) >> 8 | ((q)&0xFF000000) >> 24)
#endif

#ifndef SLITTLE
#define SLITTLE(q) (q)
#endif
#else
#ifndef SLITTLE
#define SLITTLE(q) (((q)&0x000000FF) << 24 | ((q)&0x0000FF00) << 8 | ((q)&0x00FF0000) >> 8 | ((q)&0xFF000000) >> 24)
#endif

constexpr uint32_t SBig(uint32_t val) { return val; }
constexpr uint64_t SBig(uint64_t val) { return val; }
#ifndef SBIG
#define SBIG(q) (q)
#endif
#endif

class FourCC {
protected:
  union {
    char fcc[4];
    uint32_t num;
  };

public:
  FourCC() /* Sentinel FourCC */
  : num(0) {}
  FourCC(const FourCC& other) { num = other.num; }
  FourCC(const char* name) : num(*(uint32_t*)name) {}
  FourCC(uint32_t n) : num(n) {}
  bool operator==(const FourCC& other) const { return num == other.num; }
  bool operator!=(const FourCC& other) const { return num != other.num; }
  bool operator==(const char* other) const { return num == *(uint32_t*)other; }
  bool operator!=(const char* other) const { return num != *(uint32_t*)other; }
  bool operator==(int32_t other) const { return num == other; }
  bool operator!=(int32_t other) const { return num != other; }
  bool operator==(uint32_t other) const { return num == other; }
  bool operator!=(uint32_t other) const { return num != other; }
  std::string toString() const { return std::string(fcc, 4); }
  uint32_t toUint32() const { return num; }
  operator uint32_t() const { return num; }
};

struct SAsset {
  FourCC type;
  uint64_t id;
  std::string name;
  std::string dir;
};

enum class FileLockType { None = 0, Read, Write };

#if _WIN32
using Sstat = struct ::_stat64;
#else
using Sstat = struct stat;
#endif

struct FILEDeleter {
  void operator()(FILE* file) const { std::fclose(file); }
};
using FILEPtr = std::unique_ptr<FILE, FILEDeleter>;

FILEPtr Fopen(const char* path, const char* mode, FileLockType lock = FileLockType::None) {
#if _WIN32
  const nowide::wstackstring wpath(path);
  const nowide::wshort_stackstring wmode(mode);
  FILEPtr fp{_wfopen(wpath.get(), wmode.get())};
  if (!fp) {
    return nullptr;
  }
#else
  FILEPtr fp{std::fopen(path, mode)};
  if (!fp) {
    return nullptr;
  }
#endif

  if (lock != FileLockType::None) {
#if _WIN32
    OVERLAPPED ov = {};
    LockFileEx((HANDLE)(uintptr_t)_fileno(fp.get()), (lock == FileLockType::Write) ? LOCKFILE_EXCLUSIVE_LOCK : 0, 0, 0,
               1, &ov);
#else
    if (flock(fileno(fp.get()), ((lock == FileLockType::Write) ? LOCK_EX : LOCK_SH) | LOCK_NB)) {
      std::fprintf(stderr, "flock %s: %s", path, strerror(errno));
    }
#endif
  }

  return fp;
}
} // Anonymous namespace

std::string getValidExtension(const std::string& type) {
  if (type == "ANIM") {
    return "ani";
  }
  if (type == "ANCS") {
    return "acs";
  }
  if (type == "PART") {
    return "gpsm.part";
  }
  if (type == "ELSC") {
    return "elsm.elsc";
  }
  if (type == "SWHC") {
    return "swsh.swhc";
  }
  if (type == "DPSC") {
    return "dpsm.dpsc";
  }
  if (type == "CRSC") {
    return "crsm.crsc";
  }
  if (type == "WPSC") {
    return "wpsm.wpsc";
  }
  if (type == "FONT") {
    return "rpff";
  }
  if (type == "MLVL") {
    return "mwld";
  }
  if (type == "CINF") {
    return "cin";
  }
  return type;
}

int main(int argc, char* argv[]) {
#if _WIN32
  nowide::args _(argc, argv);
#endif

  logvisor::RegisterStandardExceptions();
  logvisor::RegisterConsoleLogger();
  if (argc < 3) {
    Log.report(logvisor::Error, FMT_STRING("Usage: {} <input> <output>"), argv[0]);
    return 1;
  }

  std::string inPath = argv[1];
  std::string outPath = argv[2];

  tinyxml2::XMLDocument doc;
  std::vector<SAsset> assets;
  FILEPtr docF = Fopen(inPath.c_str(), "rb");
  if (doc.LoadFile(docF.get()) == tinyxml2::XML_SUCCESS) {
    const tinyxml2::XMLElement* elm = doc.RootElement();
    if (strcmp(elm->Name(), "AssetNameMap") != 0) {
      Log.report(logvisor::Fatal, FMT_STRING("Invalid database supplied"));
      return 1;
    }

    elm = elm->FirstChildElement("AssetNameMap");
    if (elm == nullptr) {
      Log.report(logvisor::Fatal, FMT_STRING("Malformed AssetName database"));
      return 1;
    }

    elm = elm->FirstChildElement("Asset");

    while (elm != nullptr ) {
      const tinyxml2::XMLElement* keyElm = elm->FirstChildElement("Key");
      const tinyxml2::XMLElement* valueElm = elm->FirstChildElement("Value");

      if (keyElm == nullptr || valueElm == nullptr) {
        Log.report(logvisor::Fatal, FMT_STRING("Malformed Asset entry, [Key,Value] required"));
        return 0;
      }

      const tinyxml2::XMLElement* nameElm = valueElm->FirstChildElement("Name");
      const tinyxml2::XMLElement* dirElm = valueElm->FirstChildElement("Directory");
      const tinyxml2::XMLElement* typeElm = valueElm->FirstChildElement("Type");
      const tinyxml2::XMLElement* autoGenNameElm = valueElm->FirstChildElement("AutoGenName");
      const tinyxml2::XMLElement* autoGenDirElm = valueElm->FirstChildElement("AutoGenDir");

      if (nameElm == nullptr || dirElm == nullptr || typeElm == nullptr) {
        Log.report(logvisor::Fatal, FMT_STRING("Malformed Value entry, [Name,Directory,Type] required"));
        return 0;
      }
      bool autoGen = strncasecmp(autoGenNameElm->GetText(), "true", 4) == 0 && strncasecmp(autoGenDirElm->GetText(), "true", 4) == 0;
      uint64_t id = strtoull(keyElm->GetText(), nullptr, 16);
      std::string dir = dirElm->GetText();
      std::string name = nameElm->GetText();
      std::string type = typeElm->GetText();
      std::string projPath = "$/" + dir + name + "." + getValidExtension(type);
      std::transform(projPath.begin(), projPath.end(), projPath.begin(), [](unsigned  char c) -> unsigned  char { return std::tolower(c); });
      uint32_t tmpId = crc32(reinterpret_cast<const uint8_t*>(projPath.c_str()), projPath.length(), 0xFFFFFFFF, 0);
      if (!autoGen || tmpId == id) {
        SAsset& asset = assets.emplace_back();
        asset.type = typeElm->GetText();
        asset.id = id;
        asset.name = nameElm->GetText();
        asset.dir = dirElm->GetText();
      }
      elm = elm->NextSiblingElement("Asset");
    }

    FILEPtr f = Fopen(outPath.c_str(), "wb");
    if (f == nullptr) {
      Log.report(logvisor::Fatal, FMT_STRING("Unable to open destination"));
      return 0;
    }

    uint32_t assetCount = SBig(uint32_t(assets.size()));
    FourCC sentinel(SBIG('AIDM'));
    fwrite(&sentinel, sizeof(FourCC), 1, f.get());
    fwrite(&assetCount, sizeof(uint32_t), 1, f.get());
    for (const SAsset& asset : assets) {
      fwrite(&asset.type, sizeof(asset.type), 1, f.get());
      uint64_t id = SBig(asset.id);
      fwrite(&id, sizeof(uint64_t), 1, f.get());
      uint32_t tmp = SBig(uint32_t(asset.name.length()));
      fwrite(&tmp, sizeof(tmp), 1, f.get());
      fwrite(asset.name.c_str(), 1, SBig(tmp), f.get());
      tmp = SBig(uint32_t(asset.dir.length()));
      fwrite(&tmp, sizeof(tmp), 1, f.get());
      fwrite(asset.dir.c_str(), SBig(tmp), 1, f.get());
    }
    fflush(f.get());
    return 0;
  }

  Log.report(logvisor::Fatal, FMT_STRING("failed to load"));
  return 1;
}