/*
  * This program is free software: you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation, either version 3 of the License, or
  * any later version.
  *
  * This program is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
  * GNU General Public License for more details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program.  If not, see <http://www.gnu.org/licenses/>.
  *
  * Additional permission under GNU GPL version 3 section 7
  *
  * If you modify this Program, or any covered work, by linking or combining
  * it with OpenSSL (or a modified version of that library), containing parts
  * covered by the terms of OpenSSL License and SSLeay License, the licensors
  * of this Program grant you additional permission to convey the resulting work.
  *
  */

#include "jconf.hpp"
#include "params.hpp"

#include "xmrstak/misc/console.hpp"
#include "xmrstak/misc/jext.hpp"
#include "xmrstak/misc/console.hpp"
#include "xmrstak/misc/utility.hpp"

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <math.h>
#include <vector>
#include <numeric>
#include <algorithm>

#ifdef _WIN32
#define strcasecmp _stricmp
#include <intrin.h>
#else
#include <cpuid.h>
#endif


using namespace rapidjson;

/*
 * This enum needs to match index in oConfigValues, otherwise we will get a runtime error
 */
enum configEnum {
	aPoolList, bTlsSecureAlgo, sCurrency, iCallTimeout, iNetRetry, iGiveUpLimit, iVerboseLevel, bPrintMotd, iAutohashTime, 
	bFlushStdout, bDaemonMode, sOutputFile, iHttpdPort, sHttpLogin, sHttpPass, bPreferIpv4, bAesOverride, sUseSlowMem 
};

struct configVal {
	configEnum iName;
	const char* sName;
	Type iType;
};

// Same order as in configEnum, as per comment above
// kNullType means any type
configVal oConfigValues[] = {
	{ aPoolList, "pool_list", kArrayType },
	{ bTlsSecureAlgo, "tls_secure_algo", kTrueType },
	{ sCurrency, "currency", kStringType },
	{ iCallTimeout, "call_timeout", kNumberType },
	{ iNetRetry, "retry_time", kNumberType },
	{ iGiveUpLimit, "giveup_limit", kNumberType },
	{ iVerboseLevel, "verbose_level", kNumberType },
	{ bPrintMotd, "print_motd", kTrueType },
	{ iAutohashTime, "h_print_time", kNumberType },
	{ bFlushStdout, "flush_stdout", kTrueType},
	{ bDaemonMode, "daemon_mode", kTrueType },
	{ sOutputFile, "output_file", kStringType },
	{ iHttpdPort, "httpd_port", kNumberType },
	{ sHttpLogin, "http_login", kStringType },
	{ sHttpPass, "http_pass", kStringType },
	{ bPreferIpv4, "prefer_ipv4", kTrueType },
	{ bAesOverride, "aes_override", kNullType },
	{ sUseSlowMem, "use_slow_memory", kStringType }
};

constexpr size_t iConfigCnt = (sizeof(oConfigValues)/sizeof(oConfigValues[0]));

inline bool checkType(Type have, Type want)
{
	if(want == have)
		return true;
	else if(want == kNullType)
		return true;
	else if(want == kTrueType && have == kFalseType)
		return true;
	else if(want == kFalseType && have == kTrueType)
		return true;
	else
		return false;
}

struct jconf::opaque_private
{
	Document jsonDoc;
	const Value* configValues[iConfigCnt]; //Compile time constant

	opaque_private()
	{
	}
};

jconf::jconf()
{
	prv = new opaque_private();
}

uint64_t jconf::GetPoolCount()
{
	if(prv->configValues[aPoolList]->IsArray())
		return prv->configValues[aPoolList]->Size();
	else
		return 0;
}

bool jconf::GetPoolConfig(size_t id, pool_cfg& cfg)
{
	if(id >= GetPoolCount())
		return false;

	typedef const Value* cval;
	cval jaddr, jlogin, jpasswd, jnicehash, jtls, jtlsfp, jwt;
	const Value& oThdConf = prv->configValues[aPoolList]->GetArray()[id];

	/* We already checked presence and types */
	jaddr = GetObjectMember(oThdConf, "pool_address");
	jlogin = GetObjectMember(oThdConf, "wallet_address");
	jpasswd = GetObjectMember(oThdConf, "pool_password");
	jnicehash = GetObjectMember(oThdConf, "use_nicehash");
	jtls = GetObjectMember(oThdConf, "use_tls");
	jtlsfp = GetObjectMember(oThdConf, "tls_fingerprint");
	jwt = GetObjectMember(oThdConf, "pool_weight");

	cfg.sPoolAddr = jaddr->GetString();
	cfg.sWalletAddr = jlogin->GetString();
	cfg.sPasswd = jpasswd->GetString();
	cfg.nicehash = jnicehash->GetBool();
	cfg.tls = jtls->GetBool();
	cfg.tls_fingerprint = jtlsfp->GetString();
	cfg.raw_weight = jwt->GetUint64();
	
	size_t dlt = wt_max - wt_min;
	if(dlt != 0)
	{
		/* Normalise weights between 0 and 9.9 */
		cfg.weight = double(cfg.raw_weight - wt_min) * 9.9;
		cfg.weight /= dlt;
	}
	else /* Special case - user selected same weights for everything */
		cfg.weight = 0.0;
}

bool jconf::TlsSecureAlgos()
{
	return prv->configValues[bTlsSecureAlgo]->GetBool();
}

const std::string jconf::GetCurrency()
{
	auto& currency = xmrstak::params::inst().currency;
	if(currency.empty())
		currency = prv->configValues[sCurrency]->GetString();
	if(
#ifndef CONF_NO_MONERO
			// if monero is disabled at compile time, enable error message if selected currency is `monero`
			!xmrstak::strcmp_i(currency, "monero")
#else
			true
#endif
			&&
#ifndef CONF_NO_AEON
			// if aeon is disabled at compile time, enable error message if selected currency is `aeon`
			!xmrstak::strcmp_i(currency, "aeon")
#else
			true
#endif
	)
	{
		printer::inst()->print_msg(L0, "ERROR: Wrong currency selected - '%s'.", currency.c_str());
		win_exit();
	}
	return currency;
}

bool jconf::IsCurrencyMonero()
{
	if(xmrstak::strcmp_i(GetCurrency(), "monero"))
	{
		return true;
	}
	else
	{
		return false;
	}
}

bool jconf::PreferIpv4()
{
	return prv->configValues[bPreferIpv4]->GetBool();
}

uint64_t jconf::GetCallTimeout()
{
	return prv->configValues[iCallTimeout]->GetUint64();
}

uint64_t jconf::GetNetRetry()
{
	return prv->configValues[iNetRetry]->GetUint64();
}

uint64_t jconf::GetGiveUpLimit()
{
	return prv->configValues[iGiveUpLimit]->GetUint64();
}

uint64_t jconf::GetVerboseLevel()
{
	return prv->configValues[iVerboseLevel]->GetUint64();
}

bool jconf::PrintMotd()
{
	return prv->configValues[bPrintMotd]->GetBool();
}

uint64_t jconf::GetAutohashTime()
{
	return prv->configValues[iAutohashTime]->GetUint64();
}

uint16_t jconf::GetHttpdPort()
{
	return prv->configValues[iHttpdPort]->GetUint();
}

const char* jconf::GetHttpUsername()
{
	return prv->configValues[sHttpLogin]->GetString();
}

const char* jconf::GetHttpPassword()
{
	return prv->configValues[sHttpPass]->GetString();
}

bool jconf::DaemonMode()
{
	return prv->configValues[bDaemonMode]->GetBool();
}

const char* jconf::GetOutputFile()
{
	return prv->configValues[sOutputFile]->GetString();
}

void jconf::cpuid(uint32_t eax, int32_t ecx, int32_t val[4])
{
	memset(val, 0, sizeof(int32_t)*4);

#ifdef _WIN32
	__cpuidex(val, eax, ecx);
#else
	__cpuid_count(eax, ecx, val[0], val[1], val[2], val[3]);
#endif
}

bool jconf::check_cpu_features()
{
	constexpr int AESNI_BIT = 1 << 25;
	constexpr int SSE2_BIT = 1 << 26;
	int32_t cpu_info[4];
	bool bHaveSse2;

	cpuid(1, 0, cpu_info);

	bHaveAes = (cpu_info[2] & AESNI_BIT) != 0;
	bHaveSse2 = (cpu_info[3] & SSE2_BIT) != 0;

	return bHaveSse2;
}

jconf::slow_mem_cfg jconf::GetSlowMemSetting()
{
	const char* opt = prv->configValues[sUseSlowMem]->GetString();

	if(strcasecmp(opt, "always") == 0)
		return always_use;
	else if(strcasecmp(opt, "no_mlck") == 0)
		return no_mlck;
	else if(strcasecmp(opt, "warn") == 0)
		return print_warning;
	else if(strcasecmp(opt, "never") == 0)
		return never_use;
	else
		return unknown_value;
}

bool jconf::parse_config(const char* sFilename)
{
	FILE * pFile;
	char * buffer;
	size_t flen;

	if(!check_cpu_features())
	{
		printer::inst()->print_msg(L0, "CPU support of SSE2 is required.");
		return false;
	}

	pFile = fopen(sFilename, "rb");
	if (pFile == NULL)
	{
		printer::inst()->print_msg(L0, "Failed to open config file %s.", sFilename);
		return false;
	}

	fseek(pFile,0,SEEK_END);
	flen = ftell(pFile);
	rewind(pFile);

	if(flen >= 64*1024)
	{
		fclose(pFile);
		printer::inst()->print_msg(L0, "Oversized config file - %s.", sFilename);
		return false;
	}

	if(flen <= 16)
	{
		fclose(pFile);
		printer::inst()->print_msg(L0, "File is empty or too short - %s.", sFilename);
		return false;
	}

	buffer = (char*)malloc(flen + 3);
	if(fread(buffer+1, flen, 1, pFile) != 1)
	{
		free(buffer);
		fclose(pFile);
		printer::inst()->print_msg(L0, "Read error while reading %s.", sFilename);
		return false;
	}
	fclose(pFile);

	//Replace Unicode BOM with spaces - we always use UTF-8
	unsigned char* ubuffer = (unsigned char*)buffer;
	if(ubuffer[1] == 0xEF && ubuffer[2] == 0xBB && ubuffer[3] == 0xBF)
	{
		buffer[1] = ' ';
		buffer[2] = ' ';
		buffer[3] = ' ';
	}

	buffer[0] = '{';
	buffer[flen] = '}';
	buffer[flen + 1] = '\0';

	prv->jsonDoc.Parse<kParseCommentsFlag|kParseTrailingCommasFlag>(buffer, flen+2);
	free(buffer);

	if(prv->jsonDoc.HasParseError())
	{
		printer::inst()->print_msg(L0, "JSON config parse error(offset %llu): %s",
			int_port(prv->jsonDoc.GetErrorOffset()), GetParseError_En(prv->jsonDoc.GetParseError()));
		return false;
	}


	if(!prv->jsonDoc.IsObject())
	{ //This should never happen as we created the root ourselves
		printer::inst()->print_msg(L0, "Invalid config file. No root?\n");
		return false;
	}

	for(size_t i = 0; i < iConfigCnt; i++)
	{
		if(oConfigValues[i].iName != i)
		{
			printer::inst()->print_msg(L0, "Code error. oConfigValues are not in order.");
			return false;
		}

		prv->configValues[i] = GetObjectMember(prv->jsonDoc, oConfigValues[i].sName);

		if(prv->configValues[i] == nullptr)
		{
			printer::inst()->print_msg(L0, "Invalid config file. Missing value \"%s\".", oConfigValues[i].sName);
			return false;
		}

		if(!checkType(prv->configValues[i]->GetType(), oConfigValues[i].iType))
		{
			printer::inst()->print_msg(L0, "Invalid config file. Value \"%s\" has unexpected type.", oConfigValues[i].sName);
			return false;
		}
	}

	size_t pool_cnt = prv->configValues[aPoolList]->Size();
	if(pool_cnt == 0)
	{
		printer::inst()->print_msg(L0, "Invalid config file. pool_list must not be empty.");
		return false;
	}
	
	std::vector<size_t> pool_weights;
	pool_weights.reserve(pool_cnt);
	
	const char* aPoolValues[] = { "pool_address", "wallet_address", "pool_password", "use_nicehash", "use_tls", "tls_fingerprint", "pool_weight" };
	Type poolValTypes[] = { kStringType, kStringType, kStringType, kTrueType, kTrueType, kStringType, kNumberType };
	
	constexpr size_t pvcnt = sizeof(aPoolValues)/sizeof(aPoolValues[0]);
	for(uint32_t i=0; i < pool_cnt; i++)
	{
		const Value& oThdConf = prv->configValues[aPoolList]->GetArray()[i];
		
		if(!oThdConf.IsObject())
		{
			printer::inst()->print_msg(L0, "Invalid config file. pool_list must contain objects.");
			return false;
		}

		for(uint32_t j=0; j < pvcnt; j++)
		{
			const Value* v;
			if((v = GetObjectMember(oThdConf, aPoolValues[j])) == nullptr)
			{
				printer::inst()->print_msg(L0, "Invalid config file. Pool %u does not have the value %s.", i, aPoolValues[j]);
				return false;
			}

			if(!checkType(v->GetType(), poolValTypes[j]))
			{
				printer::inst()->print_msg(L0, "Invalid config file. Value %s for pool %u has unexpected type.", aPoolValues[j], i);
				return false;
			}
		}

		const Value* jwt = GetObjectMember(oThdConf, "pool_weight");
		size_t wt;
		if(!jwt->IsUint64() || (wt = jwt->GetUint64()) == 0)
		{
			printer::inst()->print_msg(L0, "Invalid pool list for pool %u. Pool weight needs to be an integer larger than zero.", i);
			return false;
		}

		pool_weights.emplace_back(wt);
	}

	wt_max = *std::max_element(pool_weights.begin(), pool_weights.end());
	wt_min = *std::min_element(pool_weights.begin(), pool_weights.end());

	if(!prv->configValues[iCallTimeout]->IsUint64() ||
		!prv->configValues[iNetRetry]->IsUint64() ||
		!prv->configValues[iGiveUpLimit]->IsUint64())
	{
		printer::inst()->print_msg(L0,
			"Invalid config file. call_timeout, retry_time and giveup_limit need to be positive integers.");
		return false;
	}

	if(prv->configValues[iCallTimeout]->GetUint64() < 2 || prv->configValues[iNetRetry]->GetUint64() < 2)
	{
		printer::inst()->print_msg(L0,
			"Invalid config file. call_timeout and retry_time need to be larger than 1 second.");
		return false;
	}

	if(!prv->configValues[iVerboseLevel]->IsUint64() || !prv->configValues[iAutohashTime]->IsUint64())
	{
		printer::inst()->print_msg(L0,
			"Invalid config file. verbose_level and h_print_time need to be positive integers.");
		return false;
	}

	if(!prv->configValues[iHttpdPort]->IsUint() || prv->configValues[iHttpdPort]->GetUint() > 0xFFFF)
	{
		printer::inst()->print_msg(L0,
			"Invalid config file. httpd_port has to be in the range 0 to 65535.");
		return false;
	}

	if(prv->configValues[bAesOverride]->IsBool())
		bHaveAes = prv->configValues[bAesOverride]->GetBool();

	if(!bHaveAes)
		printer::inst()->print_msg(L0, "Your CPU doesn't support hardware AES. Don't expect high hashrates.");

	printer::inst()->set_verbose_level(prv->configValues[iVerboseLevel]->GetUint64());

	if(GetSlowMemSetting() == unknown_value)
	{
		printer::inst()->print_msg(L0,
			"Invalid config file. use_slow_memory must be \"always\", \"no_mlck\", \"warn\" or \"never\"");
		return false;
	}

#ifdef _WIN32
	if(GetSlowMemSetting() == no_mlck)
	{
		printer::inst()->print_msg(L0, "On Windows large pages need mlock. Please use another option.");
		return false;
	}
#endif // _WIN32

	if (prv->configValues[bFlushStdout]->IsBool())
	{
		bool bflush = prv->configValues[bFlushStdout]->GetBool();
		printer::inst()->set_flush_stdout(bflush);
		if (bflush)
		{
			printer::inst()->print_msg(L0, "Flush stdout forced.");
		}
	}

	return true;
}