// $Id: main.cpp,v 1.2 2004/07/06 12:07:00 loreti Exp $

#define MONDAY_IS_0             // REQUIRED! (snip4.cpp relies on that)

// Yes, I know; it is a very very bad policy the inclusion of a source
// file.  But consider that these files were born as stand-alone
// examples, and not as part of a single program.

#include "snip0.cpp"
#include "snip1.cpp"
#include "snip2.cpp"
#include "snip3.cpp"
#include "snip4.cpp"
#include "snip5.cpp"
#include "snip6.cpp"

void g2j();
void j2g();
void g2f();
void f2g();
void g2w();

using namespace std;

static const char * mNames [] = {
  "???",
  "Jan", "Feb", "Mar", "Apr", "May", "Jun",
  "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};

static const char * wNames [] = {
  "Monday", "Tuesday", "Wednesday", "Thursday",
  "Friday", "Saturday", "Sunday"
};

int main() {
  while (true) {
    istringstream iss;
    string s;
    int i;

    cout << "0: Gregorian -> Julian\n";
    cout << "1: Julian -> Gregorian\n";
    cout << "2: Gregorian -> French\n";
    cout << "3: French -> Gregorian\n";
    cout << "4: Gregorian -> Week #\n";
    cout << "5: Exit\n? ";

    if (!getline(cin, s)) break;
    iss.str(s);
    iss >> i;
    switch (i) {
      case 0: g2j(); break;
      case 1: j2g(); break;
      case 2: g2f(); break;
      case 3: f2g(); break;
      case 4: g2w(); break;
      case 5: return 0;
      default: cerr << "Invalid input\n"; break;
    }
  }

  cout << '\n';
  return 0;
}

void g2j() {
  int day, month, year;
  long julian;

  while (true) {
    istringstream iss;
    string s;

    cout << "Day, month, year (or EOF to exit) ? ";
    if (!getline(cin, s)) break;
    iss.str(s);
    iss >> day  >> month >> year;
    try {
      julian = greg2jul(day, month, year);
      cout << day << '-' << mNames[month] << '-'
           << year << " is JD " << julian << endl;
    } catch (const exception & e) {
      cerr << "*** EXCEPTION: " << e.what() << endl;
    }
  }
  cin.clear();
}

void j2g() {
  int day, month, year;
  long julian;

  while (true) {
    istringstream iss;
    string s;

    cout << "Julian day (or EOF to exit) ? ";
    if (!getline(cin, s)) break;
    iss.str(s);
    iss >> julian;
    try {
      jul2greg(julian, day, month, year);
      cout << "JD " << julian << " is " << day << '-'
           << mNames[month] << '-' << year << endl;
    } catch (const exception & e) {
      cerr << "*** EXCEPTION: " << e.what() << endl;
    }
  }
  cin.clear();
}

void g2f() {
  int day, month, year, fDay, fMonth, fYear;
  long julian;

  while (true) {
    istringstream iss;
    string s;

    cout << "Day, month, year (or EOF to exit) ? ";
    if (!getline(cin, s)) break;
    iss.str(s);
    iss >> day  >> month >> year;
    try {
      julian = greg2jul(day, month, year);
      jul2french(julian, fDay, fMonth, fYear);
      cout << day << '-' << mNames[month] << '-'
           << year << " is ";
      if (fMonth == 13) cout << sansCulNames[fDay];
      else              cout << fDay << ' '
                             << frenchMonthsNames[fMonth];
      cout << " an " << roman(fYear) << endl;
    } catch (const exception & e) {
      cerr << "*** EXCEPTION: " << e.what() << endl;
    }
  }
  cin.clear();
}

void f2g()
{
  int day, month, year, fDay, fMonth, fYear;
  long julian;

  while (true) {
    istringstream iss;
    string s;

    cout << "Day, month, year (or EOF to exit) ? ";
    if (!getline(cin, s)) break;
    iss.str(s);
    iss >> fDay  >> fMonth >> fYear;
    try {
      julian = french2jul(fDay, fMonth, fYear);
      jul2greg(julian, day, month, year);
      if (fMonth == 13) cout << sansCulNames[fDay];
      else              cout << fDay << ' '
                             << frenchMonthsNames[fMonth];
      cout << " an " << roman(fYear) << " is " << day << '-'
           << mNames[month] << '-' << year << endl;
    } catch (const exception & e) {
      cerr << "*** EXCEPTION: " << e.what() << endl;
    }
  }
  cin.clear();
}

void g2w()
{
  int day, month, year, wDay;
  long wNum;

  while (true) {
    istringstream iss;
    string s;

    cout << "Day, month, year (or EOF to exit) ? ";
    if (!getline(cin, s)) break;
    iss.str(s);
    iss >> day  >> month >> year;
    try {
      wDay = weekDay(day, month, year);
      wNum = week(day, month, year);
      cout << "- " << day << '-' << mNames[month] << '-' << year
           << " is a " << wNames[wDay] << ", and in the ISO week "
           << wNum/100 << '-' << wNum%100 << endl;
    } catch (const exception & e) {
      cerr << "*** EXCEPTION: " << e.what() << endl;
    }
  }
  cin.clear();
}