#include<iostream>
#include<fstream>
#include<sstream>
#include<string>
#include <date.h>
using namespace std;

struct Contact{
    string name;
    string address;
    string HomeNumber;
    string WorkNumber;
    string MobileNumber;
    string email;
    string dobYear;
    string dobMonth;
    string dobDay;
    int age
};

const int MAX = 101;
Contact listContact[MAX];
int ContactCounter;

int checkEmail (Contact c)
{
    c.email.find("@");
    if (c.email.find("@")>c.email.length())
        return 0;
    else return 1;
}

Contact newContact()
{
    Contact c;
    do {
        cout << endl << "Enter name : ";
    getline (cin, c.name);
    if (c.name == "")
        cout << "Invalid Name." << endl;
    else cout << endl;
    } while(c.name == "");
    
    do {
        cout << endl << "Enter address : ";
    getline (cin, c.address );
    if (c.address == "")
        cout << "Invalid Address." << endl;
    else cout << endl;
    } while (c.address == "");
    
    do {
        cout << endl << "Enter home number : ";
    getline (cin, c.HomeNumber );
    if (c.HomeNumber == "")
        cout << "Invalid Number." << endl;
    else cout << endl;
    } while (c.HomeNumber == "");
    
    do {
        cout << endl << "Enter work number : ";
    getline (cin, c.WorkNumber );
    if (c.WorkNumber == "")
        cout << "Invalid Number." << endl;
    else cout << endl;
    } while (c.WorkNumber == "");
    
    do {
        cout << endl << "Enter mobile number : ";
    getline (cin, c.MobileNumber );
    if (c.MobileNumber == "")
        cout << "Invalid Number." << endl;
    else cout << endl;
    } while(c.MobileNumber == "");
    
    do {
        cout << endl << "Enter email : ";
    getline (cin, c.email );
    if (checkEmail (c)==0)
        cout << "Invalid Email Address." << endl;
    else cout << endl;
    } while (checkEmail (c) ==0);
    
    do {
        cout << endl << "Enter year of birth(4 digits) : ";
    getline (cin, c.dobYear );
    } while (c.dobYear == "");
    
    do {
        cout << endl << "Enter month of birth(2 digits) : ";
    getline (cin, c.dobMonth);
    if (c.name == "")
        cout << "Invalid name." << endl;
    else cout << endl;
    } while(c.dobMonth == "");
    
    do {
        cout << endl << "Enter day of birth(2 digits) : ";
    getline (cin, c.dobDay);
    } while (c.dobDay == "");

    int numdobDay;
    stringstream dobDaystream(c.dobDay);
    dobDaystream >> numdobDay;
    
    int numdobMonth;
    stringstream dobMonthstream(c.dobMonth);
    dobMonthstream >> numdobMonth;

    int numdobYear;
    stringstream dobYearstream(c.dobYear);
    dobYearstream >> numdobYear;


    date today;
    cout << today;
    cout << endl << "The year is " << today.year();
    cout << endl << "The month is " << today.month();
    cout << endl << "The day is " << today.day();
    
    
    c.age = today.year - numdobYear;
    if (numdobMonth > today.month)
    --c.age;
    else if (numdobMonth == today.month && numdobDay > today.day )
    --c.age;
    else if (numdobMonth == today.month && numdobDay == today.day )
    cout << "^_^ Happy Birthday To You ";

    return c;
}

void writeContacts(Contact &c, ofstream &os)
{
    os << c.name << endl
        << c.address << endl
        << c.HomeNumber << endl
        << c.WorkNumber << endl
        << c.MobileNumber << endl
        << c.email << endl
        << c.dobYear << endl
        << c.dobMonth << endl
        << c.dobDay << endl;
}

void readContacts(Contact &c, ifstream &is)
{
    getline(is, c.name);
    getline(is, c.address);
    getline(is, c.HomeNumber);
    getline(is, c.WorkNumber);
    getline(is, c.MobileNumber);
    getline(is, c.email);
    getline(is, c.dobYear);
    getline(is, c.dobMonth);
    getline(is, c.dobDay);
}

void addContact()
{
    cout << endl << "Input new contact data: " << endl;
    int ContactCounter = 0;
    listContact[ContactCounter] = newContact();
    ContactCounter++;
}

void display(Contact &c, ifstream &is)
{
    cout << endl << "Contact Data:" << endl
        << "Name          - " << c.name << endl
        << "Address       - " << c.address << endl
        << "Home Number   - " << c.HomeNumber << endl
        << "Work Number   - " << c.WorkNumber << endl
        << "Mobile Number - " << c.MobileNumber << endl
        << "Email         - " << c.email << endl
        << "Date of Birth - " << c.dobDay <<"/"<< c.dobMonth <<"/"<< c.dobYear << endl;
}

void displayContact(Contact c)
{
        cout << endl
        << "Name          - " << c.name << endl
        << "Address       - " << c.address << endl
        << "Home Number   - " << c.HomeNumber << endl
        << "Work Number   - " << c.WorkNumber << endl
        << "Mobile Number - " << c.MobileNumber << endl
        << "Email         - " << c.email << endl
        << "Date of Birth - " << c.dobDay <<"/"<< c.dobMonth <<"/"<< c.dobYear << endl;
}

void readFile()
{
   try{
      ifstream inFile("C:\\Temp\\Contacts.dat", ios::in);
      inFile >> ContactCounter;
      inFile.ignore();
      for(int i=0; i<ContactCounter; i++)
       display(listContact[i], inFile);
      inFile.close();
   }
   catch(exception e) {
      cout << endl << "<-|Error|->" << endl << "Could not read file." << endl;
   }
}

void writeFile()
{
    try{
        ofstream outFile("C:\\Temp\\Contacts.dat", ios::out);
        outFile << ContactCounter << endl;
        for(int i=0; i<ContactCounter; i++)
            writeContacts(listContact[i], outFile);
        outFile.close();
    }
    catch(exception e) {
      cout << endl << "<-|Error|->" << endl << "Could not read file." << endl;
    }
}

void doMenu()
{
      int choice;
      int ContactNumber;
      do{
          cout << "Enter your selection." << endl;
         cout << "1. Load Contacts List" << endl;
         cout << "2. Save Contacts List" << endl;
         cout << "3. Add a Contact" << endl;
         cout << "4. Display Contact(s) Details" << endl;
         cout << "5. Quit" << endl;
         cin >> choice;
         cin.ignore();
         switch(choice)
         {
         case 1: readFile();
             break;
         case 2: writeFile();
             break;
         case 3: newContact();
             break;
         /*case 4: cout << "Enter the number of the contact : " << endl;
             cin << ContactNumber;
             for (int i; i < MAX; i++)
                displayContact (ContactNumber)
                 else cout << "Contact Not Found." <<endl;*/
         }
      } while(choice != 5);
}

int main ()
{
    readFile();
    doMenu();
    writeFile();
}

#ifndef _DATE_TYPE
#define _DATE_TYPE
#include<ctime>
#include<iostream>
using namespace std;

class date{
private:
    int _day, _month, _year;
public:
    date(int d, int m, int y){
        _day = d;
        _month = m;
        _year = y;
    }
    int day(){return _day;}
    int month(){return _month;}
    int year(){return _year;}
    date(){
        time_t theTime;
        tm localTime;
        time(&theTime);
        localtime_s(&localTime, &theTime);
        _day = localTime.tm_mday;
        _month = localTime.tm_mon;
        _year = localTime.tm_year+1900;
    }
    friend ostream& operator<<(ostream& os, const date &d){
        return os << d._day << '/' << d._month << '/' << d._year;
    }
};
#endif

case 4: cout << "Enter the number of the contact : " << endl;
  cin >> ContactNumber;
  if(ContactCounter > ContactNumber >= 0) {
    displayContact(listContact[ContactNumber]);
  } else {
    cout << "Contact Not Found." <<endl;
  }