import java.util.ArrayList;
import java.util.Scanner;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.net.URL;
import java.net.MalformedURLException;
import java.io.InputStream;
import java.net.Socket;

class Student
{
    private void checkValidity( )
    {
        if( pantherID.length( ) != 7 )
            throw new IllegalArgumentException( "PantherID is 7 digits!" );

        if( gpa < 0 )
            throw new IllegalArgumentException( "GPA out of bounds" );

        gpa = Math.min( gpa, 4.0 );

        checkMajor( major );

    }

    public Student( String p, String ln, String fn, String m, double g )
    {
        pantherID = p;
        lastName = ln;
        firstName = fn;
        major = m;
        gpa = g;

        checkValidity( );
    }

    /**
     * 
     * @param studentInfo: in format ID, LN, FN, MAJOR, GPA
     */
    public Student( String studentInfo )
    {
        Scanner sc = new Scanner( studentInfo );
        pantherID = sc.next( );
        lastName = sc.next( );
        firstName = sc.next( );
        major = sc.next( );
        gpa = sc.nextDouble( );

        checkValidity( );
    }

    public String getName( )
    {
        return firstName + " " + lastName;
    }

    public String getPantherID( )
    {
        return pantherID;
    }

    public double getGPA( )
    {
        return gpa;
    }

    public String getMajor( )
    {
        return major;
    }

    public void changeMajor( String newMajor )
    {
        checkMajor( newMajor );
        major = newMajor;
    }

    public boolean equals( Object other )
    {
        if( other instanceof Student == false )
            return false;

        Student rhs = (Student) other;

        return pantherID.equals( rhs.pantherID );
    }

    public String toString( )
    {
        return getName( ) + " " + "(" + pantherID + ")"
                  + " majoring in " + major + " with " + gpa + " gpa";
    }

    private String pantherID;
    private String lastName;
    private String firstName;
    private String major;
    private double gpa;

    private void checkMajor( String proposedMajor )
    {
        for( String m : validMajors )
            if( m.equals( proposedMajor ) )
                return;   // found a major

        throw new IllegalArgumentException( "Invalid major " + proposedMajor );
    }

    public static final String [ ] validMajors = { "CS", "IT", "MIS" };
}

class Day04
{
    public static void main( String [ ] args )
    {
        /*
         * THIS PART WAS TESTING STUDENT WITH A FEW DIRECTLY CONSTRUCTED
         */
        /*
        Student s1 = new Student( "1234567", "Doe", "Jane", "IT", 4.65 );
        Student s2 = new Student( "1234556", "Doe", "John", "CS", 3.41 );
        Student s3 = new Student( "1234556", "Doe", "John", "CS", 3.41 );

        System.out.println( "s1: " + s1 );
        System.out.println( "s2: " + s2 );
        System.out.println( "s3: " + s3 );

        System.out.println( s3.equals( s2 ) );

        s3.changeMajor( "BIO" );
        ArrayList<Student> arr = new ArrayList<Student>( );
        arr.add( s1 );
        arr.add( s2 );

        System.out.println( arr.contains( s3 ) );
         * */


        /**
         * This part was reading from a file looking for
         * CS majors
         */
        /*
        String fileName = "day04.txt";

        File f = new File( fileName );

        try
        {
            Scanner sc = new Scanner( f );
            ArrayList<Student> arr = new ArrayList<Student>( );

            while( sc.hasNextLine( ) )
                arr.add( new Student( sc.nextLine( ) ) );

            System.out.println( arr );

            System.out.println( "CS Majors only: " );
            for( Student s : arr )
                if( s.getMajor( ).equals( "CS" ) )
                    System.out.println( s );
        }
        catch( IOException e )
        {
            System.out.println( "I/O error in file " + fileName );
        }
         */

        try
        {
            /*
            URL u = new URL( "http://www.cnn.com/" );
            InputStream is = u.openStream( );
            Scanner sc = new Scanner( is );

            while( sc.hasNextLine( ) )
                System.out.println( sc.nextLine( ) );
             * */

            Socket s = new Socket( "hpdrc.cs.fiu.edu", 13 );
            InputStream is = s.getInputStream( );
            Scanner sc = new Scanner( is );

            while( sc.hasNextLine( ) )
                System.out.println( sc.nextLine( ) );
        }
        catch( IOException e )
        {
            System.out.println( "Bad URL" );
        }


    }

}