/*
Hubert Zhang - CPS 171
c17121
Last Modified 3/31/2020
*/
#include <iostream>
#include <iomanip>
#include <fstream>
#include <string>
#include <cmath>

using namespace std;

bool Leap_Year(int year);
void Get_Date(ifstream& fin, ofstream& fout, int& month, int& day, int& year, bool& valid, bool& leap);
string Print_Month(int month);
int Convert_to_Julian(int month, int day, bool& leap);
int Time_Elapsed(int year1, int year2, int julian1, int julian2);

int main()
{
	ifstream fin;
	ofstream fout;
	fin.open("mp4in.txt");
	fout.open("mp4out.txt");

	int month1 = 0, day1 = 0, year1 = 0, month2 = 0, day2 = 0, year2 = 0, time = 0,
		julian1 = 0, julian2 = 0, temp_year, temp_month, temp_day;
	bool valid1 = true, leap1 = true, valid2 = true, leap2 = true;

	Get_Date(fin, fout, month1, day1, year1, valid1, leap1);
	Get_Date(fin, fout, month2, day2, year2, valid2, leap2);
	while (fin)
	{
		if (year1 > year2)
		{
			temp_year = year1;
			year1 = year2;
			year2 = temp_year;
			temp_month = month1;
			month1 = month2;
			month2 = temp_month;
			temp_day = day1;
			day1 = day2;
			day2 = temp_day;
		}
		else if (month1 == month2)
		{
			if (day1 > day2)
			{
				temp_day = day1;
				day1 = day2;
				day2 = temp_day;
			}
		}

		fout << month1 << " " << day1 << " " << year1 << endl;
		fout << month2 << " " << day2 << " " << year2 << endl;

		julian1 = Convert_to_Julian(month1, day1, leap1);
		julian2 = Convert_to_Julian(month2, day2, leap2);
		time = Time_Elapsed(year1, year2, julian1, julian2);

		if (time == 1)
		{
			fout << "There is " << time << " day between " << Print_Month(month1) << " " << day1 << ", "
				 << year1 << " and " << Print_Month(month2) << " " << day2 << ", " << year2 << endl;
		}
		else
		{
			fout << "There is " << time << " days between " << Print_Month(month1) << " " << day1 << ", "
				 << year1 << " and " << Print_Month(month2) << " " << day2 << ", " << year2 << endl;
		}
		Get_Date(fin, fout, month1, day1, year1, valid1, leap1);
		Get_Date(fin, fout, month2, day2, year2, valid2, leap2);
	}
}

bool Leap_Year(int year)
{
	bool leap;
	if (year % 4 == 0)
	{
		leap = true;
		if (year % 100 == 0)
		{
			if (year % 400 != 0)
			{
				leap = false;
			}
		}
	}
	else
	{
		leap = false;
	}
	return leap;
}

void Get_Date(ifstream& fin, ofstream& fout, int& month, int& day, int& year, bool& valid, bool& leap)
{
	fin >> month >> day >> year;
	leap = Leap_Year(year);

	if (year < 1582)
	{
		fout << "Error. Invalid Year. ";
		valid = false;
	}

	if (month < 1 || month > 12)
	{
		fout << "Error. Invalid Month. ";
		valid = false;
	}

	switch (month)
	{
	case 1:
	if (day < 1 || day > 31)
	{
		fout << "Error. Invalid Day. ";
		valid = false;
	}
		  break;
	case 2:
	if (leap)
	{
		if (day < 1 || day > 29)
		{
			fout << "Error. Invalid Day. ";
			valid = false;
		}
	}
	else if (day < 1 || day > 28)
	{
		fout << "Error. Invalid Day. ";
		valid = false;
	}
		  break;
	case 3:
	if (day < 1 || day > 31)
	{
		fout << "Error. Invalid Day. ";
		valid = false;
	}
		  break;
	case 4:
	if (day < 1 || day > 30)
	{
		fout << "Error. Invalid Day. ";
		valid = false;
	}
		  break;
	case 5:
	if (day < 1 || day > 31)
	{
		fout << "Error. Invalid Day. ";
		valid = false;
	}
		  break;
	case 6:
		if (day < 1 || day > 30)
	{
		fout << "Error. Invalid Day. ";
		valid = false;
	}
		  break;
	case 7:
	if (day < 1 || day > 31)
	{
		fout << "Error. Invalid Day. ";
		valid = false;
	}
		  break;
	case 8:
	if (day < 1 || day > 31)
	{
		fout << "Error. Invalid Day. ";
		valid = false;
	}
		  break;
	case 9:
	if (day < 1 || day > 30)
	{
		fout << "Error. Invalid Day. ";
		valid = false;
	}
		  break;
	case 10:
	if (day < 1 || day > 31)
	{
		fout << "Error. Invalid Day. ";
		valid = false;
	}
		   break;
	case 11:
	if (day < 1 || day > 30)
	{
		fout << "Error. Invalid Day. ";
		valid = false;
	}
		   break;
	case 12:
	if (day < 1 || day > 31)
	{
		fout << "Error. Invalid Day. ";
		valid = false;
	}
		   break;
	}
}

string Print_Month(int month)
{
	switch (month)
	{
	case 1: return "January";
		break;
	case 2: return "Feburary";
		break;
	case 3: return "March";
		break;
	case 4: return "April";
		break;
	case 5: return "May";
		break;
	case 6: return "June";
		break;
	case 7: return "July";
		break;
	case 8: return "August";
		break;
	case 9: return "September";
		break;
	case 10: return "October";
		break;
	case 11: return "November";
		break;
	case 12: return "December";
		break;
	}
	return "";
}

int Convert_to_Julian(int month, int day, bool& leap)
{
	int counter = 0;
	month--;
	switch (month)
	{
	case 11: counter += 30;
	case 10: counter += 31;
	case 9: counter += 30;
	case 8: counter += 31;
	case 7: counter += 31;
	case 6: counter += 30;
	case 5: counter += 31;
	case 4: counter += 30;
	case 3: counter += 31;
	case 2:
	if (leap)
	{
		counter += 29;
	}
	else
	{
		counter += 28;
	}
	case 1:
		counter += 31;
		break;
	}
	counter += day;
	return counter;
}

int Time_Elapsed(int year1, int year2, int julian1, int julian2)
{
	int num_days = 0, temp = 0;

	if (year1 == year2)
	{
		num_days = abs(julian1 - julian2);
	}
	else
	{
		for (year1; year1 < year2; year1++)
		{
			bool leap = Leap_Year(year1);
			if (leap)
			{
				num_days += 366;
			}
			else
			{
				num_days += 365;
			}
		}
		num_days = num_days - julian1 + julian2;
	}
	return num_days;
}