class Date

/* Write a class that has three unsigned members representing a year, month,
 * and day. Write a constructor that takes a string representing a date. Your
 * constructor should handle a variety of date formats, such as January 1,
 * 1990. 1/1/1900. Jan 1, 1900, and so on.
 */
#include <iostream>
#include <vector>
#include <sstream>
#include <string>
using std::cin; using std::cout; using std::endl; using std::vector;
using std::string; using std::istringstream; using std::ostream;

class Date {
friend void mdy(const string &str, Date &obj);
friend void mmdy(const string &str, Date &obj);
friend void slashmdy(const string &str, Date &obj);
public:
    Date() : year(0), month(0), day(0) {}
    Date(const string &str);
    void printdata(ostream &os) { cout << "Month: " << month << "\n"
                    << "Day: " << day << "\n"
                    << "Year: " << year << endl;}
private:
    unsigned year, month, day;
    vector<const string> monthabbr = {"Jan", "Feb", "Mar", "Apr", "May",
            "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
    vector<const string> month = {"January", "February", "March", "April",
            "May", "June", "July", "August", "September",
            "October", "November", "December"};
};

int main(void)
{
    /*cout << "Creating first: ";
    Date first;
    cout << endl;*/
    cout << "Creating second: ";
    Date second("Jan 1, 1900");
    second.printdata(cout);
    cout << "Creating third: ";
    Date third("5/12/1900");
    third.printdata(cout);
    /*
    cout << "Creating fourth: ";
    Date fourth("1/1,/1900");*/
    cout << endl;
    //first.printdata(cout);
    //second.printdata(cout);
    return 0;
}
// Jan 31, 2014
void mdy(const string &str, Date &obj)
{

}

// January 2, 2018
void mmdy(const string &str, Date &obj)
{

}
// 1/1/1900 | m/d/y
// 11/31/1900
void slashmdy(const string &str, Date &obj)
{
    unsigned pos = 0;
    obj.month = 0, obj.day = 0, obj.year = 0;
    string::const_iterator current;
    // Create three istringstreams and convert it to int
    for (string::const_iterator beg = str.begin();
        beg != str.end();
        ++beg, ++pos) {
        // get month
        if (*beg == '/' && pos > 0 && pos < 3) {
            string  strmonth(str.begin(), beg);
            istringstream convert(strmonth);
            current = beg;
            if (!(convert >> obj.month))
                obj.month = 0;
        }
        // get day and year
        if (*beg == '/' && pos > 2 && pos < 6) {
            string strday(current + 1, beg);
            istringstream convert(strday);
            current = beg;
            if (!(convert >> obj.day))
                obj.day = 0;
            string stryear(current + 1, str.end());
            istringstream convertyr(stryear);
            if (!(convertyr >> obj.year))
                obj.year = 0;
        }
    }
    // now check if date is correctly, no need to check the year
    if (!(obj.month >= 1 && obj.month <= 12))
        obj.month = 0;
    if (!(obj.day >= 1 && obj.day <= 31))
        obj.day = 0;
}

/* Types of initialization:
   1: "January 1, 1990" // call mmdy()
   2: "1/1/1900" // call slashmdy
   3: "Jan 1, 1900"*/ // call mdy()
   /* Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec */
Date::Date (const string &str)
{
    unsigned slash = 0, comma = 0;
    for (string::const_iterator beg = str.begin();
        beg != str.end();
        ++beg) {
        switch (*beg) {
            case '/': ++slash; break;
            case ',': ++comma; break;
            default: break;
        }
    }

    if (slash == 2 && !comma) { //-- seems ok
        slashmdy(str, *this);
    } else if (comma == 1 && !slash) {
        cout << "One comma!" << endl;
        unsigned count = 0;
        for (string::const_iterator beg = str.begin();
            beg != str.end();
            ++beg, ++count)
            if (*beg == ' ')
                break;
            if (count == 3)
                cout << "mdy();" << endl; //mdy(str, *this);
            else
                cout << "mmdy();"<< endl;//mmdy(str, *this);
    } else {
        // "default" initialize, didn't want use delegated constructors
        month = 0, day = 0, year = 0;
    }
}