import java.util.*;

public class StudentRecord
{
    private String ID;
    private String firstName;
    private String lastName;
    private String address;
    private GregorianCalendar timeModified;
    
    // Constructor with one parameter
    public StudentRecord(String studentID)
    {
        ID = studentID;
        firstName = "unknown";
        lastName = "unknown";
        address = "unknown";
        timeModified = new GregorianCalendar();
    }
    
    // Constructor with five parameters
    public StudentRecord(String studentID,
        String studentFirstName,
        String studentLastName,
        String studentAddress,
        GregorianCalendar studentTimeModified)
    {
        ID = studentID;
        firstName = studentFirstName;
        lastName = studentLastName;
        address = studentAddress;
        timeModified = studentTimeModified;
    }

    // mutator methods (that set specific fields)
    public void setAddress(String newAddress)
    {
        address = newAddress;
        timeModified = new GregorianCalendar();      
    }
    public void setFirstName(String newFirstName)
    {
        firstName = newFirstName;
        timeModified = new GregorianCalendar();      
    }
    public void setLastName(String newLastName)
    {
        lastName = newLastName;
        timeModified = new GregorianCalendar();      
    }
    public void setAddress()
    {
        address = "unknown";
        timeModified = new GregorianCalendar();      
    }
    public void setFirstName()
    {
        firstName = "unknown";
        timeModified = new GregorianCalendar();      
    }
    public void setLastName()
    {
        lastName = "unknown";
        timeModified = new GregorianCalendar();      
    }
    public void setID(String newID)
    {
        ID = newID;
        timeModified = new GregorianCalendar();      
    }
    public void setTimeModified(GregorianCalendar newTimeModified)
    {
        timeModified = newTimeModified;      
    }
    
    // Accessor methods
    public String getAddress()
    {
        return address;      
    }
    public String getFirstName()
    {
        return firstName;    
    }
    public String getLastName()
    {
        return lastName;  
    }
    public String getID()
    {
        return ID;   
    }
    public GregorianCalendar getTimeModified()
    {
        return timeModified;     
    }
    
    public void synchronize(StudentRecord otherRecord)
    {
        if (ID.equals(otherRecord.ID))
        {
            int compResult;
            
            if (timeModified.before(otherRecord.getTimeModified()))
               compResult = -1;
            else if (timeModified.after(otherRecord.getTimeModified()))
               compResult = 1;
            else compResult = 0;
 
//             // If we want to implement our comparison directly
//             if (timeModified.get(Calendar.YEAR) < otherRecord.timeModified.get(Calendar.YEAR))
//                compResult = -1;
//             else if (timeModified.get(Calendar.YEAR) > otherRecord.timeModified.get(Calendar.YEAR))
//                compResult = 1;
//             else if (timeModified.get(Calendar.MONTH) < otherRecord.timeModified.get(Calendar.MONTH))
//                compResult = -1;
//             else if (timeModified.get(Calendar.MONTH) > otherRecord.timeModified.get(Calendar.MONTH))
//                compResult = 1;
//             else if (timeModified.get(Calendar.DAY_OF_MONTH) < otherRecord.timeModified.get(Calendar.DAY_OF_MONTH))
//                compResult = -1;
//             else if (timeModified.get(Calendar.DAY_OF_MONTH) > otherRecord.timeModified.get(Calendar.DAY_OF_MONTH))
//                compResult = 1;
//             else compResult = 0;
            
            if (compResult < 0)
            {
                firstName = otherRecord.getFirstName();
                lastName = otherRecord.getLastName();
                address = otherRecord.getAddress();
                timeModified = otherRecord.getTimeModified();
            }
            else if (compResult > 0)
            {
                otherRecord.setFirstName(firstName);
                otherRecord.setLastName(lastName);
                otherRecord.setAddress(address);
                otherRecord.setTimeModified(timeModified);
            }
        }
    }
        
    public String toString(){
        return "Student ID number: " + ID +  "\n" +
               "Student Name: " + firstName + " " + lastName + "\n" +
               "Student Address: " + address + "\n" +
               "Last time modified: " + (timeModified.get(Calendar.MONTH)+1) + "/" +
                timeModified.get(Calendar.DAY_OF_MONTH) + "/" +  
                timeModified.get(Calendar.YEAR);
    }
}