// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2012 The Bitcoin developers
// Distributed under the MIT/X11 software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_UTIL_H
#define BITCOIN_UTIL_H


#include "uint256.h"

#ifndef WIN32
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#endif

#include <map>
#include <vector>
#include <string>

#ifndef Q_MOC_RUN
#include <boost/thread.hpp>
#include <boost/filesystem.hpp>
#include <boost/filesystem/path.hpp>
#include <boost/date_time/gregorian/gregorian_types.hpp>
#include <boost/date_time/posix_time/posix_time_types.hpp>
#endif

#include <stdarg.h>

#if defined(__USE_MINGW_ANSI_STDIO)
#undef __USE_MINGW_ANSI_STDIO // This constant forces MinGW to conduct stupid behavior
#endif
#include <inttypes.h>

#include "netbase.h" // for AddTimeData

static const int32_t nOneHour = 60 * 60;
static const int32_t nOneDay = 24 * 60 * 60;

static const int64_t COIN = 1000000;
static const int64_t CENT = 10000;

#define BEGIN(a)            ((char*)&(a))
#define END(a)              ((char*)&((&(a))[1]))
#define UBEGIN(a)           ((unsigned char*)&(a))
#define UEND(a)             ((unsigned char*)&((&(a))[1]))
#define ARRAYLEN(array)     (sizeof(array)/sizeof((array)[0]))

#define UVOIDBEGIN(a)        ((void*)&(a))
#define CVOIDBEGIN(a)        ((const void*)&(a))
#define UINTBEGIN(a)        ((uint32_t*)&(a))
#define CUINTBEGIN(a)        ((const uint32_t*)&(a))

#ifndef THROW_WITH_STACKTRACE
#define THROW_WITH_STACKTRACE(exception)  \
{                                         \
    LogStackTrace();                      \
    throw (exception);                    \
}
void LogStackTrace();
#endif

#if defined(_MSC_VER) || defined(__MSVCRT__)
 /* Silence compiler warnings on Windows 
     related to MinGWs inttypes.h */
 #undef PRIu64
 #undef PRId64
 #undef PRIx64

 #define PRIu64 "I64u"
 #define PRId64 "I64d"
 #define PRIx64 "I64x"

#endif

/* Format characters for (s)size_t and ptrdiff_t */
#if defined(_MSC_VER) || defined(__MSVCRT__)
  /* (s)size_t and ptrdiff_t have the same size specifier in MSVC:
     http://msdn.microsoft.com/en-us/library/tcxf1dw6%28v=vs.100%29.aspx
   */
  #define PRIszx    "Ix"
  #define PRIszu    "Iu"
  #define PRIszd    "Id"
  #define PRIpdx    "Ix"
  #define PRIpdu    "Iu"
  #define PRIpdd    "Id"
#else /* C99 standard */
  #define PRIszx    "zx"
  #define PRIszu    "zu"
  #define PRIszd    "zd"
  #define PRIpdx    "tx"
  #define PRIpdu    "tu"
  #define PRIpdd    "td"
#endif

// This is needed because the foreach macro can't get over the comma in pair<t1, t2>
#define PAIRTYPE(t1, t2)    std::pair<t1, t2>

// Align by increasing pointer, must have extra space at end of buffer
template <size_t nBytes, typename T>
T* alignup(T* p)
{
    union
    {
        T* ptr;
        size_t n;
    } u;
    u.ptr = p;
    u.n = (u.n + (nBytes-1)) & ~(nBytes-1);
    return u.ptr;
}

#ifdef WIN32
#define MSG_NOSIGNAL        0
#define MSG_DONTWAIT        0

#ifndef S_IRUSR
#define S_IRUSR             0400
#define S_IWUSR             0200
#endif
#else
#define MAX_PATH            1024
inline void Sleep(int64_t n)
{
    /*Boost has a year 2038 problem— if the request sleep time is past epoch+2^31 seconds the sleep returns instantly.
      So we clamp our sleeps here to 10 years and hope that boost is fixed by 2028.*/
    boost::thread::sleep(boost::get_system_time() + boost::posix_time::milliseconds(n>315576000000LL?315576000000LL:n));
}
#endif

/* This GNU C extension enables the compiler to check the format string against the parameters provided.
 * X is the number of the "format string" parameter, and Y is the number of the first variadic parameter.
 * Parameters count from 1.
 */
#ifdef __GNUC__
#define ATTR_WARN_PRINTF(X,Y) __attribute__((format(printf,X,Y)))
#else
#define ATTR_WARN_PRINTF(X,Y)
#endif








extern std::map<std::string, std::string> mapArgs;
extern std::map<std::string, std::vector<std::string> > mapMultiArgs;
extern bool fDebug;
extern bool fDebugNet;
extern bool fPrintToConsole;
extern bool fPrintToDebugger;
extern bool fRequestShutdown;
extern bool fShutdown;
extern bool fDaemon;
extern bool fServer;
extern bool fCommandLine;
extern std::string strMiscWarning;
extern bool fTestNet;
extern bool fNoListen;
extern bool fLogTimestamps;
extern bool fReopenDebugLog;

void RandAddSeed();
void RandAddSeedPerfmon();
int ATTR_WARN_PRINTF(1,2) OutputDebugStringF(const char* pszFormat, ...);

/*
  Rationale for the real_strprintf / strprintf construction:
    It is not allowed to use va_start with a pass-by-reference argument.
    (C++ standard, 18.7, paragraph 3). Use a dummy argument to work around this, and use a
    macro to keep similar semantics.
*/

/** Overload strprintf for char*, so that GCC format type warnings can be given */
std::string ATTR_WARN_PRINTF(1,3) real_strprintf(const char *format, int dummy, ...);
/** Overload strprintf for std::string, to be able to use it with _ (translation).
 * This will not support GCC format type warnings (-Wformat) so be careful.
 */
std::string real_strprintf(const std::string &format, int dummy, ...);
#define strprintf(format, ...) real_strprintf(format, 0, __VA_ARGS__)
std::string vstrprintf(const char *format, va_list ap);

bool ATTR_WARN_PRINTF(1,2) error(const char *format, ...);

/* Redefine printf so that it directs output to debug.log
 *
 * Do this *after* defining the other printf-like functions, because otherwise the
 * __attribute__((format(printf,X,Y))) gets expanded to __attribute__((format(OutputDebugStringF,X,Y)))
 * which confuses gcc.
 */
#define printf OutputDebugStringF

void LogException(std::exception* pex, const char* pszThread);
void PrintException(std::exception* pex, const char* pszThread);
void PrintExceptionContinue(std::exception* pex, const char* pszThread);
void ParseString(const std::string& str, char c, std::vector<std::string>& v);
std::string FormatMoney(int64_t n, bool fPlus=false);
bool ParseMoney(const std::string& str, int64_t& nRet);
bool ParseMoney(const char* pszIn, int64_t& nRet);
std::vector<unsigned char> ParseHex(const char* psz);
std::vector<unsigned char> ParseHex(const std::string& str);
bool IsHex(const std::string& str);
std::vector<unsigned char> DecodeBase64(const char* p, bool* pfInvalid = NULL);
std::string DecodeBase64(const std::string& str);
std::string EncodeBase64(const unsigned char* pch, size_t len);
std::string EncodeBase64(const std::string& str);
std::vector<unsigned char> DecodeBase32(const char* p, bool* pfInvalid = NULL);
std::string DecodeBase32(const std::string& str);
std::string EncodeBase32(const unsigned char* pch, size_t len);
std::string EncodeBase32(const std::string& str);
std::string EncodeDumpTime(int64_t nTime);
int64_t DecodeDumpTime(const std::string& s);
std::string EncodeDumpString(const std::string &str);
std::string DecodeDumpString(const std::string &str);
void ParseParameters(int argc, const char*const argv[]);
bool WildcardMatch(const char* psz, const char* mask);
bool WildcardMatch(const std::string& str, const std::string& mask);
void FileCommit(FILE *fileout);
int GetFilesize(FILE* file);
bool RenameOver(boost::filesystem::path src, boost::filesystem::path dest);
boost::filesystem::path GetDefaultDataDir();
const boost::filesystem::path &GetDataDir(bool fNetSpecific = true);
boost::filesystem::path GetConfigFile();
boost::filesystem::path GetPidFile();
#ifndef WIN32
void CreatePidFile(const boost::filesystem::path &path, pid_t pid);
#endif
void ReadConfigFile(std::map<std::string, std::string>& mapSettingsRet, std::map<std::string, std::vector<std::string> >& mapMultiSettingsRet);
#ifdef WIN32
boost::filesystem::path GetSpecialFolderPath(int nFolder, bool fCreate = true);
#endif
void ShrinkDebugFile();
int GetRandInt(int nMax);
uint64_t GetRand(uint64_t nMax);
uint256 GetRandHash();
int64_t GetTime();
void SetMockTime(int64_t nMockTimeIn);
int64_t GetAdjustedTime();
int64_t GetTimeOffset();
int64_t GetNodesOffset();
std::string FormatFullVersion();
std::string FormatSubVersion(const std::string& name, int nClientVersion, const std::vector<std::string>& comments);
void AddTimeData(const CNetAddr& ip, int64_t nTime);
void runCommand(std::string strCommand);









inline std::string i64tostr(int64_t n)
{
    return strprintf("%" PRId64, n);
}

inline std::string itostr(int n)
{
    return strprintf("%d", n);
}

inline int64_t atoi64(const char* psz)
{
#ifdef _MSC_VER
    return _atoi64(psz);
#else
    return strtoll(psz, NULL, 10);
#endif
}

inline int64_t atoi64(const std::string& str)
{
#ifdef _MSC_VER
    return _atoi64(str.c_str());
#else
    return strtoll(str.c_str(), NULL, 10);
#endif
}

inline int32_t strtol(const char* psz)
{
    return strtol(psz, NULL, 10);
}

inline int32_t strtol(const std::string& str)
{
    return strtol(str.c_str(), NULL, 10);
}

inline uint32_t strtoul(const char* psz)
{
    return strtoul(psz, NULL, 10);
}

inline uint32_t strtoul(const std::string& str)
{
    return strtoul(str.c_str(), NULL, 10);
}

inline int atoi(const std::string& str)
{
    return atoi(str.c_str());
}

inline int roundint(double d)
{
    return (int)(d > 0 ? d + 0.5 : d - 0.5);
}

inline int64_t roundint64(double d)
{
    return (int64_t)(d > 0 ? d + 0.5 : d - 0.5);
}

inline int64_t abs64(int64_t n)
{
    return (n >= 0 ? n : -n);
}

inline std::string leftTrim(std::string src, char chr)
{
    std::string::size_type pos = src.find_first_not_of(chr, 0);

    if(pos > 0)
        src.erase(0, pos);

    return src;
}

template<typename T>
std::string HexStr(const T itbegin, const T itend, bool fSpaces=false)
{
    std::string rv;
    static const char hexmap[16] = { '0', '1', '2', '3', '4', '5', '6', '7',
                                     '8', '9', 'a', 'b', 'c', 'd', 'e', 'f' };
    rv.reserve((itend-itbegin)*3);
    for(T it = itbegin; it < itend; ++it)
    {
        unsigned char val = (unsigned char)(*it);
        if(fSpaces && it != itbegin)
            rv.push_back(' ');
        rv.push_back(hexmap[val>>4]);
        rv.push_back(hexmap[val&15]);
    }

    return rv;
}

inline std::string HexStr(const std::vector<unsigned char>& vch, bool fSpaces=false)
{
    return HexStr(vch.begin(), vch.end(), fSpaces);
}

template<typename T>
void PrintHex(const T pbegin, const T pend, const char* pszFormat="%s", bool fSpaces=true)
{
    printf(pszFormat, HexStr(pbegin, pend, fSpaces).c_str());
}

inline void PrintHex(const std::vector<unsigned char>& vch, const char* pszFormat="%s", bool fSpaces=true)
{
    printf(pszFormat, HexStr(vch, fSpaces).c_str());
}

inline int64_t GetPerformanceCounter()
{
    int64_t nCounter = 0;
#ifdef WIN32
    QueryPerformanceCounter((LARGE_INTEGER*)&nCounter);
#else
    timeval t;
    gettimeofday(&t, NULL);
    nCounter = (int64_t) t.tv_sec * 1000000 + t.tv_usec;
#endif
    return nCounter;
}

inline int64_t GetTimeMillis()
{
    return (boost::posix_time::microsec_clock::universal_time() -
            boost::posix_time::ptime(boost::gregorian::date(1970,1,1))).total_milliseconds();
}

std::string DateTimeStrFormat(const char* pszFormat, int64_t nTime);

static const std::string strTimestampFormat = "%Y-%m-%d %H:%M:%S UTC";
inline std::string DateTimeStrFormat(int64_t nTime)
{
    return DateTimeStrFormat(strTimestampFormat.c_str(), nTime);
}


template<typename T>
void skipspaces(T& it)
{
    while (isspace(*it))
        ++it;
}

inline bool IsSwitchChar(char c)
{
#ifdef WIN32
    return c == '-' || c == '/';
#else
    return c == '-';
#endif
}

/**
 * Return string argument or default value
 *
 * @param strArg Argument to get (e.g. "-foo")
 * @param default (e.g. "1")
 * @return command-line argument or default value
 */
std::string GetArg(const std::string& strArg, const std::string& strDefault);

/**
 * Return 64-bit integer argument or default value
 *
 * @param strArg Argument to get (e.g. "-foo")
 * @param default (e.g. 1)
 * @return command-line argument (0 if invalid number) or default value
 */
int64_t GetArg(const std::string& strArg, int64_t nDefault);

/**
 * Return 32-bit integer argument or default value
 *
 * @param strArg Argument to get (e.g. "-foo")
 * @param default (e.g. 1)
 * @return command-line argument (0 if invalid number) or default value
 */
int32_t GetArgInt(const std::string& strArg, int32_t nDefault);

/**
 * Return 32-bit unsigned integer argument or default value
 *
 * @param strArg Argument to get (e.g. "-foo")
 * @param default (e.g. 1)
 * @return command-line argument (0 if invalid number) or default value
 */
uint32_t GetArgUInt(const std::string& strArg, uint32_t nDefault);

/**
 * Return boolean argument or default value
 *
 * @param strArg Argument to get (e.g. "-foo")
 * @param default (true or false)
 * @return command-line argument or default value
 */
bool GetBoolArg(const std::string& strArg, bool fDefault=false);

/**
 * Set an argument if it doesn't already have a value
 *
 * @param strArg Argument to set (e.g. "-foo")
 * @param strValue Value (e.g. "1")
 * @return true if argument gets set, false if it already had a value
 */
bool SoftSetArg(const std::string& strArg, const std::string& strValue);

/**
 * Set a boolean argument if it doesn't already have a value
 *
 * @param strArg Argument to set (e.g. "-foo")
 * @param fValue Value (e.g. false)
 * @return true if argument gets set, false if it already had a value
 */
bool SoftSetBoolArg(const std::string& strArg, bool fValue);

/**
 * Timing-attack-resistant comparison.
 * Takes time proportional to length
 * of first argument.
 */
template <typename T>
bool TimingResistantEqual(const T& a, const T& b)
{
    if (b.size() == 0) return a.size() == 0;
    size_t accumulator = a.size() ^ b.size();
    for (size_t i = 0; i < a.size(); i++)
        accumulator |= a[i] ^ b[i%b.size()];
    return accumulator == 0;
}

/** Median filter over a stream of values.
 * Returns the median of the last N numbers
 */
template <typename T> class CMedianFilter
{
private:
    std::vector<T> vValues;
    std::vector<T> vSorted;
    unsigned int nSize;
public:
    CMedianFilter(unsigned int size, T initial_value):
        nSize(size)
    {
        vValues.reserve(size);
        vValues.push_back(initial_value);
        vSorted = vValues;
    }

    void input(T value)
    {
        if(vValues.size() == nSize)
        {
            vValues.erase(vValues.begin());
        }
        vValues.push_back(value);

        vSorted.resize(vValues.size());
        std::copy(vValues.begin(), vValues.end(), vSorted.begin());
        std::sort(vSorted.begin(), vSorted.end());
    }

    T median() const
    {
        int size = vSorted.size();
        assert(size>0);
        if(size & 1) // Odd number of elements
        {
            return vSorted[size/2];
        }
        else // Even number of elements
        {
            return (vSorted[size/2-1] + vSorted[size/2]) / 2;
        }
    }

    int size() const
    {
        return static_cast<int>(vValues.size());
    }

    std::vector<T> sorted () const
    {
        return vSorted;
    }
};

bool NewThread(void(*pfn)(void*), void* parg);

#ifdef WIN32
inline void SetThreadPriority(int nPriority)
{
    SetThreadPriority(GetCurrentThread(), nPriority);
}
#else

#define THREAD_PRIORITY_LOWEST          PRIO_MAX
#define THREAD_PRIORITY_BELOW_NORMAL    2
#define THREAD_PRIORITY_NORMAL          0
#define THREAD_PRIORITY_ABOVE_NORMAL    0

inline void SetThreadPriority(int nPriority)
{
    // It's unclear if it's even possible to change thread priorities on Linux,
    // but we really and truly need it for the generation threads.
#ifdef PRIO_THREAD
    setpriority(PRIO_THREAD, 0, nPriority);
#else
    setpriority(PRIO_PROCESS, 0, nPriority);
#endif
}

inline void ExitThread(size_t nExitCode)
{
    pthread_exit((void*)nExitCode);
}
#endif

void RenameThread(const char* name);

inline uint32_t ByteReverse(uint32_t value)
{
    value = ((value & 0xFF00FF00) >> 8) | ((value & 0x00FF00FF) << 8);
    return (value<<16) | (value>>16);
}

#endif