global_functions.h

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const float Pi = 3.141593;


inline tm get_tm(int monthNbr = 0)
{
 time_t t = time(0);   // get time now
 struct tm *tm_date;
 tm_date = localtime(&t);
 tm_date->tm_year += floor(monthNbr / 12);
 monthNbr = monthNbr % 12;
 while (monthNbr > 0)
 {
   if (tm_date->tm_mon == 11)
   {
     tm_date->tm_mon = 0;
     tm_date->tm_year++;
   }
   else
   {
     tm_date->tm_mon++;
   }
   monthNbr--;
 }
 mktime(tm_date);  //normalize the result
 
 return *tm_date;
}

inline int tm2Mnbr(tm tmDate) {
  double x;
  time_t now;
  time(&now);
  x = difftime(mktime(&tmDate),now);
  x = x / SECONDS_IN_MONTH + 0.5;      //x = x / 60 / 60 / 24 / 30.4375 + 0.5;
  return (int) x;
}

/************* tm2DateStr ************/
// returns a string YYYY-MM-DD
inline string tm2DateStr(tm tmDate)
{
  return (to_string(tmDate.tm_year + 1900) + "-" + to_string(tmDate.tm_mon + 1) + "-" + to_string(tmDate.tm_mday)); }

inline void dateStr2tm(string dStr, tm * target_tm) 
{
  struct tm *xDate;
  xDate = target_tm;
  memset(xDate, 0, sizeof(struct tm));
  strptime(dStr.c_str(), "%Y-%m-%d", xDate);
}

inline int dateStr2Mnbr(string dStr) 
{
  struct tm xDate;
  dateStr2tm(dStr, &xDate);
  return tm2Mnbr(xDate);
}

inline string mNbr2dateStr(int monthNbr = 0)
{
  struct tm tm_date;
  tm_date = get_tm(monthNbr);
  return tm2DateStr(tm_date);
}

inline bool is_valid_dateStr(string theDate) {
    bool rc = true;
    struct tm tmDate;
//  if (theDate.length() != 10) rc = false;
    if (!strptime(theDate.c_str(), "%Y-%m-%d", &tmDate)) rc = false;
    return rc;
}

inline float flSum(std::map<int, float>* theMap, int N) {
  int k;
  float theSum = 0;
  for (k = 0; k <= N; k++) {theSum += (*theMap)[k];}
  return theSum;
}

void thousand_separator(float x, char* s) {
    int j , i = 0, k = 0, ix = (x >= 0 )?(int)floor(x):(int)ceil(x);
    //char s[50];
    if( ix < 0)//test if the number is negative
        {
            strcpy(s,"-");
            ix *= -1;
        }
        else s[0] = '0'; //strcpy(s,"");
        int temp = ix;
        int p = 1;
        while( temp > 0) //counting number of digits
        {
            temp /= 10;
            p *= 10;
            i++;
        }
        j = i % 3;
        p /= 10;

        while( i > 0 )//display integer number with 1000 seperator
        {
            s[k] = char ((ix/p) +'0');
            ix %= p;
            p /= 10;
            i--;
            k++;
            j--;
            if ((k % 3 == 0 && i > 0)||(j == 0 && i > 2) )
            {
                strcat(s,",");
                k = 0;
            }
        }
}

/*inline string currFormat(float x, string theCurr) {
  char s[50], s2[30];
  thousand_separator(x,s2);
  strcpy(s, s2);
  sprintf(s2,"%.02f", x - floor(x));
  strcat(s,s2);
//  sprintf(s,"%.02f", x);
  if (theCurr == "EUR") strcat(s," &#8364;");
    else strcat(s,theCurr.c_str());
  return s;
}*/
inline string currFormat(float x, string theCurr) {
  char s[50];
  sprintf(s,"%.02f", x);
  if (theCurr == "EUR") strcat(s," &#8364;");
    else strcat(s,theCurr.c_str());
  return s;
}


//using namespace std;

string curr_format(float dv, string the_curr = "")
{
//  const int width = CURR_LEN;
  const string radix = ".";
  const string thousands = ",";
  string the_sign, unit;
  if        (the_curr == "EUR") unit = " &#8364;";
    else if (the_curr == "USD") unit = " &#36;";
    else if (the_curr == "GBP") unit = " &#163;";
    else if (the_curr == "JPY") unit = " &#165;";
    else                        unit = the_curr;
  if (dv < 0)
    {
      dv = - dv;
      the_sign = " -";
    }
    else
    {
      the_sign = "";
    }
  unsigned long v = (unsigned long) ((dv * 100.0) + .5);
  string fmt,digit;
  int i = -2;
  do {
    if(i == 0) {
      fmt = radix + fmt;
    }
    if((i > 0) && (!(i % 3))) {
      fmt = thousands + fmt;
    }
    digit = (v % 10) + '0';
    fmt = digit + fmt;
    v /= 10;
  i++;
  }
  while((v) || (i < 1));
  //cout << unit << setw(width) << fmt.c_str() << endl;
  return unit + the_sign + fmt;
}


inline string date_format_tm(tm * the_tm)
{
  return to_string(the_tm->tm_year + 1900) + "-" + to_string(the_tm->tm_mon + 1) + "-" + to_string(the_tm->tm_mday);
}

inline string date_format_dateStr(string s)
{
  struct tm the_tm;
  dateStr2tm(s, &the_tm);
  return to_string(the_tm.tm_year + 1900) + "-" + to_string(the_tm.tm_mon + 1) + "-" + to_string(the_tm.tm_mday);
}

inline string round2str(float x, int nbr_digits = 0)
{
  string s = "";
  if (x < 0) s = "-" + s;
  x = abs(x);
  if (nbr_digits> 0)
  {
    s = s + to_string((int) x);
    int x_dec = round((x - (int)x) * pow(10, nbr_digits));
    s = s + "." + to_string(x_dec);
  }
  else
  {
    s = s + to_string((int)(x + 0.5));
  }
  return s;
}

inline string months2yms(int m)
{
  string s;
  int yrs = (int)(m /12);
  if (yrs >= 2)       s = to_string(yrs) + " " + t_years;
  else if (yrs >= 1)  s = to_string(yrs) + " " + t_year;
  else                s = "";
  
  m = m - yrs * 12;
  
  if ((yrs != 0) && (m > 1)) s = s + " " + t_and + " ";
  
  if (m >= 2)       s = s + to_string(m) + " " + t_months;
  else if (m >= 1)  s = s + to_string(m) + " " + t_month;
  
  if ((yrs == 0) && (m == 0)) s = "0 " + t_months;
  
  return s;
}

inline string add0(int x, int n = 1)
{
  string s = "";
  int    digits;
  for (digits = 1; digits <= n; digits++)
  {
    if (x < pow(10,digits)) s = s + "0";
  }
  s = s + to_string(x);
  return s;
}