#include "vanity.hpp"
#include<regex>
#include<getopt.h>


static struct
{
	bool reg=false;
	int threads=-1;
	i2p::data::SigningKeyType signature;
	std::string outputpath="";
	std::regex regex;
} options;


static void inline CalculateW (const uint8_t block[64], uint32_t W[64])
{
/**
 * implementation of orignal
 */
	for (int i = 0; i < 16; i++)
#ifdef _WIN32
		W[i] = htobe32(((uint32_t *)(block))[i]);
#else // from big endian to little endian ( swap )
		W[i] = be32toh(((uint32_t *)(block))[i]);
#endif

	for (int i = 16; i < 64; i++)
		W[i] = s1(W[i - 2]) + W[i - 7] + s0(W[i - 15]) + W[i - 16];
}

static void inline TransformBlock (uint32_t state[8], const uint32_t W[64])
{
/**
 * implementation of orignal
 */
	uint32_t S[8];
	memcpy(S, state, 32);

	uint32_t t0, t1;
	RNDr(S, W, 0, 0x428a2f98); RNDr(S, W, 1, 0x71374491); RNDr(S, W, 2, 0xb5c0fbcf); RNDr(S, W, 3, 0xe9b5dba5);
	RNDr(S, W, 4, 0x3956c25b); RNDr(S, W, 5, 0x59f111f1); RNDr(S, W, 6, 0x923f82a4); RNDr(S, W, 7, 0xab1c5ed5);
	RNDr(S, W, 8, 0xd807aa98); RNDr(S, W, 9, 0x12835b01); RNDr(S, W, 10, 0x243185be); RNDr(S, W, 11, 0x550c7dc3);
	RNDr(S, W, 12, 0x72be5d74); RNDr(S, W, 13, 0x80deb1fe); RNDr(S, W, 14, 0x9bdc06a7); RNDr(S, W, 15, 0xc19bf174);
	RNDr(S, W, 16, 0xe49b69c1); RNDr(S, W, 17, 0xefbe4786); RNDr(S, W, 18, 0x0fc19dc6); RNDr(S, W, 19, 0x240ca1cc);
	RNDr(S, W, 20, 0x2de92c6f); RNDr(S, W, 21, 0x4a7484aa); RNDr(S, W, 22, 0x5cb0a9dc); RNDr(S, W, 23, 0x76f988da);
	RNDr(S, W, 24, 0x983e5152); RNDr(S, W, 25, 0xa831c66d); RNDr(S, W, 26, 0xb00327c8); RNDr(S, W, 27, 0xbf597fc7);
	RNDr(S, W, 28, 0xc6e00bf3); RNDr(S, W, 29, 0xd5a79147); RNDr(S, W, 30, 0x06ca6351); RNDr(S, W, 31, 0x14292967);
	RNDr(S, W, 32, 0x27b70a85); RNDr(S, W, 33, 0x2e1b2138); RNDr(S, W, 34, 0x4d2c6dfc); RNDr(S, W, 35, 0x53380d13);
	RNDr(S, W, 36, 0x650a7354); RNDr(S, W, 37, 0x766a0abb); RNDr(S, W, 38, 0x81c2c92e); RNDr(S, W, 39, 0x92722c85);
	RNDr(S, W, 40, 0xa2bfe8a1); RNDr(S, W, 41, 0xa81a664b); RNDr(S, W, 42, 0xc24b8b70); RNDr(S, W, 43, 0xc76c51a3);
	RNDr(S, W, 44, 0xd192e819); RNDr(S, W, 45, 0xd6990624); RNDr(S, W, 46, 0xf40e3585); RNDr(S, W, 47, 0x106aa070);
	RNDr(S, W, 48, 0x19a4c116); RNDr(S, W, 49, 0x1e376c08); RNDr(S, W, 50, 0x2748774c); RNDr(S, W, 51, 0x34b0bcb5);
	RNDr(S, W, 52, 0x391c0cb3); RNDr(S, W, 53, 0x4ed8aa4a); RNDr(S, W, 54, 0x5b9cca4f); RNDr(S, W, 55, 0x682e6ff3);
	RNDr(S, W, 56, 0x748f82ee); RNDr(S, W, 57, 0x78a5636f); RNDr(S, W, 58, 0x84c87814); RNDr(S, W, 59, 0x8cc70208);
	RNDr(S, W, 60, 0x90befffa); RNDr(S, W, 61, 0xa4506ceb); RNDr(S, W, 62, 0xbef9a3f7); RNDr(S, W, 63, 0xc67178f2);

	for (int i = 0; i < 8; i++)	state[i] += S[i];
}

void inline HashNextBlock (uint32_t state[8], const uint8_t * block)
{
/**
 * implementation of orignal
 */
	uint32_t W[64];
	CalculateW (block, W);
	TransformBlock (state, W);
}

static bool check_prefix(const char * buf)
{
	unsigned short size_str=0;
	while(*buf)
	{
		if(*buf < 48 || (*buf > 57 && *buf < 65) || (*buf > 64 && *buf < 94) || *buf > 125 || size_str > 52)
			return false;
		size_str++;
		buf++;
	}
	return true;
}

static inline size_t ByteStreamToBase32 (const uint8_t * inBuf, size_t len, char * outBuf, size_t outLen)
{
	size_t ret = 0, pos = 1;
	int bits = 8, tmp = inBuf[0];
	while (ret < outLen && (bits > 0 || pos < len))
	{
		if (bits < 5)
		{
			if (pos < len)
			{
				tmp <<= 8;
				tmp |= inBuf[pos] & 0xFF;
				pos++;
				bits += 8;
			}
			else // last byte
			{
				tmp <<= (5 - bits);
				bits = 5;
			}
		}

		bits -= 5;
		int ind = (tmp >> bits) & 0x1F;
		outBuf[ret] = (ind < 26) ? (ind + 'a') : ((ind - 26) + '2');
		ret++;
	}
	outBuf[ret]='\0';
	return ret;
}

static inline bool NotThat(const char * what, const std::regex & reg){
	return std::regex_match(what,reg) == 1 ? false : true;
}

static inline bool NotThat(const char * a, const char *b)
{
	while(*b)
		if(*a++!=*b++)
			return true;
	return false;
}

static inline bool thread_find(uint8_t * buf, const char * prefix, int id_thread, unsigned long long throughput)
{
/**
 * Thanks to orignal ^-^
 * For idea and example ^-^
 * Orignal is sensei of crypto ;)
 */
	std::cout << "Thread " << id_thread << " binded" << std::endl;
/*
	union
	{
		uint8_t b[391];
		uint32_t ll;
	} local;
	union
	{
		uint8_t b[32];
		uint32_t ll[8];
	} hash;
*/
	uint8_t b[391];
	uint32_t hash[8];

	memcpy (b, buf, 391);

	auto len = strlen (prefix);
	// precalculate first 5 blocks (320 bytes)
	uint32_t state[8] = { 0x6A09E667, 0xBB67AE85, 0x3C6EF372, 0xA54FF53A, 0x510E527F, 0x9B05688C, 0x1F83D9AB, 0x5BE0CD19 };
	HashNextBlock (state, b);
	HashNextBlock (state, b + 64);
	HashNextBlock (state, b + 128);
	HashNextBlock (state, b + 192);
	HashNextBlock (state, b + 256);

	// pre-calculate last W
	uint32_t lastW[64];
	CalculateW (lastBlock, lastW);

	uint32_t * nonce = (uint32_t *)(b+320);
	(*nonce) += id_thread*throughput;

	char addr[53];
	uint32_t state1[8];

	while(throughput-- and !found)
	{
		memcpy (state1, state, 32);
		// calculate hash of block with nonce
		HashNextBlock (state1, b + 320);
		// apply last block
		TransformBlock (state1, lastW);
		// get final hash
		for (int j = 8; j--;)
			hash[j] = htobe32(state1[j]);
		ByteStreamToBase32 ((uint8_t*)hash, 32, addr, len);
		// std::cout << addr << std::endl;

		// bool result = options.reg ? !NotThat(addr, &options.regex) : !NotThat(addr,prefix);

		if( ( options.reg ? !NotThat(addr, options.regex) : !NotThat(addr,prefix) ) )
		// if(result)
		{
			ByteStreamToBase32 ((uint8_t*)hash, 32, addr, 52);
			std::cout << "Address found " << addr << " in " << id_thread << std::endl;
			found=true;
			FoundNonce=*nonce;
			// free(hash);
			// free(b);
			return true;
		}


		(*nonce)++;
		hashescounter++;
		if (found)
		{
			// free(hash);
			// free(b);
			break;
		}
	} // while
	return true;
}

void usage(void){
	const constexpr char * help="vain [text-pattern|regex-pattern] [options]\n"
	"-h --help, help menu\n"
	"-r --reg,  regexp instead just text pattern (e.g. '(one|two).*')\n"
	"--threads -t, (default count of system)\n"
	"--signature -s, (signature type)\n"
	"-o --output output file (default private.dat)\n"
	"--usage usage\n"
	// "--prefix -p\n"
	"";
	puts(help);
}

void parsing(int argc, char ** args){
	int option_index;
	static struct option long_options[]={
		{"help",no_argument,0,'h'},
		{"reg", no_argument,0,'r'},
		{"threads", required_argument, 0, 't'},
		{"signature", required_argument,0,'s'},
		{"output", required_argument,0,'o'},
		{"usage", no_argument,0,0},
		{0,0,0,0}
	};

	int c;
	while( (c=getopt_long(argc,args, "hrt:s:o:", long_options, &option_index))!=-1){
		switch(c){
			case 0:
				if ( std::string(long_options[option_index].name) == std::string("usage") ){
					usage();
					exit(1);
				}
			case 'h':
				usage();
				exit(0);
				break;
			case 'r':
				options.reg=true;
				break;
			case 't':
				options.threads=atoi(optarg);
				break;
			case 's':
				options.signature = NameToSigType(std::string(optarg));
				break;
			case 'o':
				options.outputpath=optarg;
				break;
			case '?':
				std::cerr << "Undefined argument" << std::endl;
			default:
				std::cerr << args[0] << " --usage / --help" << std::endl;
				exit(1);
				break;
		}
	}
}

int main (int argc, char * argv[])
{
	if ( argc < 2 )
	{
		usage();
		return 0;
	}
	parsing( argc > 2 ? argc-1 : argc, argc > 2 ? argv+1 : argv);
	//
	if(!options.reg && !check_prefix( argv[1] ))
	{
		std::cout << "Invalid pattern." << std::endl;
		usage();
		return 1;
	}else{
		options.regex=std::regex(argv[1]);
//		int ret = regcomp( &options.regex, argv[1], REG_EXTENDED );
//		if( ret != 0 ){
//			std::cerr << "Can't create regexp pattern from " << argv[1] << std::endl;
//			return 1;
//		}
	}

	i2p::crypto::InitCrypto (false, true, true, false);
	options.signature = i2p::data::SIGNING_KEY_TYPE_EDDSA_SHA512_ED25519;
///////////////
//For while
	if(options.signature != i2p::data::SIGNING_KEY_TYPE_EDDSA_SHA512_ED25519)
	{
		std::cout << "For a while only ED25519-SHA512" << std::endl;
		return 0;
	}
///////////////

/////////////////////////////////////////////////////////////////////////////////////////////////////////////////////
	auto keys = i2p::data::PrivateKeys::CreateRandomKeys (options.signature);
	switch(options.signature)
	{
		case i2p::data::SIGNING_KEY_TYPE_DSA_SHA1:
		case i2p::data::SIGNING_KEY_TYPE_ECDSA_SHA512_P521:
		case i2p::data::SIGNING_KEY_TYPE_RSA_SHA256_2048:
		case i2p::data::SIGNING_KEY_TYPE_RSA_SHA384_3072:
		case i2p::data::SIGNING_KEY_TYPE_RSA_SHA512_4096:
		case i2p::data::SIGNING_KEY_TYPE_GOSTR3410_TC26_A_512_GOSTR3411_512:
		std::cout << "Sorry, i don't can generate address for this signature type" << std::endl;
		return 0;
		break;
	}

//TODO: for other types.
	switch(options.signature)
	{
		case i2p::data::SIGNING_KEY_TYPE_ECDSA_SHA256_P256:
		break;
		case i2p::data::SIGNING_KEY_TYPE_ECDSA_SHA384_P384:
		break;
		case i2p::data::SIGNING_KEY_TYPE_ECDSA_SHA512_P521:
		break;
		case i2p::data::SIGNING_KEY_TYPE_RSA_SHA256_2048:
		break;
		case i2p::data::SIGNING_KEY_TYPE_RSA_SHA384_3072:
		break;
		case i2p::data::SIGNING_KEY_TYPE_RSA_SHA512_4096:
		break;
		case i2p::data::SIGNING_KEY_TYPE_EDDSA_SHA512_ED25519:
			MutateByte=320;
		break;
		case i2p::data::SIGNING_KEY_TYPE_GOSTR3410_CRYPTO_PRO_A_GOSTR3411_256:
		break;
	}

	KeyBuf = new uint8_t[keys.GetFullLen()];
	keys.ToBuffer (KeyBuf, keys.GetFullLen ());

	if(options.threads <= 0)
	{
#if defined(WIN32)
		SYSTEM_INFO siSysInfo;
		GetSystemInfo(&siSysInfo);
		options.threads = siSysInfo.dwNumberOfProcessors;
#elif defined(_SC_NPROCESSORS_CONF)
		options.threads = sysconf(_SC_NPROCESSORS_CONF);
#elif defined(HW_NCPU)
		int req[] = { CTL_HW, HW_NCPU };
		size_t len = sizeof(options.threads);
		v = sysctl(req, 2, &options.threads, &len, NULL, 0);
#else
		options.threads = 1;
#endif
	}

	std::cout << "Start vanity generator in " << options.threads << " threads" << std::endl;

	unsigned short attempts = 0;
	while(!found)
	{ // while
		{ // stack(for destructors(vector/thread))

			std::vector<std::thread> threads(options.threads);
			unsigned long long thoughtput = 0x4F4B5A37;

			for ( unsigned int j = options.threads;j--;)
			{
				threads[j] = std::thread(thread_find,KeyBuf,argv[1],j,thoughtput);
				thoughtput+=1000;
			} // for

			for(unsigned int j = 0; j < (unsigned int)options.threads;j++)
				threads[j].join();

			if(FoundNonce == 0)
			{
				RAND_bytes( KeyBuf+MutateByte , 90 );
				std::cout << "Attempts #" << ++attempts << std::endl;
			}

		} // stack
	} // while

	memcpy (KeyBuf + MutateByte, &FoundNonce, 4);
	std::cout << "Hashes: " << hashescounter << std::endl;

	if(options.outputpath.size() == 0) options.outputpath="private.dat";

	std::ofstream f (options.outputpath, std::ofstream::binary | std::ofstream::out);
	if (f)
	{
		f.write ((char *)KeyBuf, keys.GetFullLen ());
		delete [] KeyBuf;
	}
	else
		std::cout << "Can't create file " << options.outputpath << std::endl;

	i2p::crypto::TerminateCrypto ();

	return 0;
}