#include <ctype.h>
#include <stdlib.h>
#include <stdio.h>

#define __DATE_CPP
#include <date.h>

#include <extcdecl.h>
#include <strings.h>
#include <utility.h>

#define DAYBIAS					36525L
#define NULLDATE				-99999L

TDate	nodate, botime, eotime(31,12,2050);
HIDDEN TDate	__tmp_date;

TDate::TDate(const TDate &d) : _val(d._val) {}


TDate::TDate(long l) : _val(l)

 {
	if (_val == TODAY)
	{
		char s[10];
		cgetdata(&_val, s);
	}
}


TDate::TDate(const char* s)

{
	_val = NULLDATE;
	if (!isdate(s)) return;

	if (strlen(s) == 10)
	{
		int day = atoi(s),
		month = atoi(&s[3]),
		year = atoi(&s[6]);
		long  off = 0L;

		if (year > 1000)
		{
			if (year < 1951) off -= DAYBIAS;
			if (year < 1851) off -= DAYBIAS;
			if (year < 1751) off -= DAYBIAS;
                        year %= 100; // modify
		}
		_val = makedata(day, month, year) + off;
	}
	else _val = cpackdata((char*)s);
}


TDate::TDate(int day, int month, int year)

{
	if (day == TODAY)
	{
		char s[10];
		cgetdata(&_val, s);
	}
	else
		if ((day == 0) || (month == 0) || (year == 0)) _val = NULLDATE;
		else
		{
			long  off = 0L;

			if (year > 1000)
			{
				if (year < 1951) off -= DAYBIAS;
				if (year < 1851) off -= DAYBIAS;
				if (year < 1751) off -= DAYBIAS;
			        year %= 100; // modify
			}
			_val = makedata(day, month, year) + off;
			if (!ok()) _val = NULLDATE;
		}
}


TDate::operator const char*() const
{
	return string(4);
}


TDate& TDate::operator =(const char* s)
{
	return *this = TDate(s);
}


void TDate::print_on(ostream& out) const
{ out << string(); }


void TDate::read_from(istream& in)
{
	in >> __tmp_string;
	if (isdate(__tmp_string)) _val = cpackdata(__tmp_string);
	else _val = NULLDATE;
}


char* TDate::string(int yeardgts, char sep) const

{
	if (!ok()) return "";
	long wv = _val;
//	int cnt = int(wv / DAYBIAS - (wv < 0 ? 1 : 0));
        int cnt = wv >= DAYBIAS ? 2000 : 1900;
	// int cnt = 0;
	// bool over2000 = wv >= DAYBIAS;
        
	while (wv < 0)
        {
	        cnt -= 100;
 		wv += DAYBIAS;
	}
	ceditdata(wv, __tmp_string);
	if (strcmp(__tmp_string, "  -  -  ") == 0) return "";
	if (sep != '-')
		for (char* s = __tmp_string; *s; s++)
			if (*s == '-') *s = sep;
	if (yeardgts > 2)
	{
		char s[8];
		// int year = ::year(wv) - cnt * 100;
		// if (year > 2000 && !over2000) year -= 100;
//		int year = 1900 + cnt * 100 + atoi(__tmp_string + 6);
		int year = cnt + atoi(__tmp_string + 6);

		if (yeardgts == 3) sprintf(s, "%03d", year % 1000);
		else sprintf(s, "%04d", year);
		__tmp_string[6] = '\0';
		strcat(__tmp_string, s);
	}
	return __tmp_string;
}


int TDate::day() const

{
	return ::day(_val);
}


int TDate::month() const

{
	return ::month(_val);
}


int TDate::year() const

{
	return ::year(_val);
}


void TDate::addmonth(int nmonth)

{
	_val = ::addmonth(_val, nmonth);
}


void TDate::addyear(int nyear)

{
	_val =  ::addyear(_val, nyear);
}


bool TDate::isdate(const char* s)
{
	if (!*s) return FALSE;
	if (strlen(s) == 10)
	{
		int day = atoi(s),
		month = atoi(&s[3]),
		year = atoi(&s[6]);
		if (day < 1 || day > 31 ||
				month < 1 || month > 12 ||
				year < 1700 || year > 2100)
			return FALSE;

		char s1[16];
		sprintf(s1, "%02d-%02d-%02d", day, month, year%100);
		return (bool)cverdata(s1);
	}

	return (bool)cverdata((char*)s);
}


bool TDate::ok() const
{
	return _val <= 2 * DAYBIAS && _val >= -2 * DAYBIAS;
}


TDate& operator +(const TDate& a, long nday)

{
	__tmp_date = long(a) + nday;
	return __tmp_date;
}


TDate& operator +(const long nday, const TDate& b)

{
	__tmp_date = long(b) + nday;
	return __tmp_date;
}


TDate& operator -(const TDate& a, long nday)

{
	__tmp_date = long(a)- nday;
	return __tmp_date;
}


void swap(TDate& a, TDate& b)

{
	__tmp_date = b;
	b = a;
	a = __tmp_date;
}


const TDate& fnc_min(const TDate& a, const TDate& b)

{
	if (a < b) return a;
	else return b;
}


const TDate& fnc_max(const TDate& a, const TDate& b)

{
	if (a > b) return a;
	else return b;
}


// Converte un numero da 1 a 12 nel corrispondente mese
const char* itom(byte m)
{
	const char* nomi[12] =
	{
		"Gennaio", "Febbraio", "Marzo", "Aprile", "Maggio", "Giugno",
		"Luglio", "Agosto", "Settembre", "Ottobre", "Novembre", "Dicembre"
	};

	return nomi[(m-1) % 12];
}

const char* itow(byte d)
{
	const char* nomi[7] =
	{ "Lunedi", "Martedi", "Mercoledi",	"Giovedi", "Venerdi",
		"Sabato", "Domenica" };
	return nomi[(d-1) % 7];
}