import structure.*;
import com.mw.io.*;
import java.io.*;

// This program prepares files for the registration project, lab 10  

public class Student implements Comparable {
  public int student_id;
  public int student_class;
  public int student_numDesired;
  public int student_numChoices;
  public Vector student_choices;    // first, second, and third choices for up to 4 courses

  public Student(int id, int cl) {
     student_id = id;
     student_class = cl;
     student_choices = new Vector();
     student_numDesired = 0;        // number of courses on the first line of the card
     student_numChoices = 0;        // total number of courses provided on the card
  }
  public boolean lessThan (Comparable other) {
    if (student_id < ((Student)other).student_id)
       return true;
    else return false;
  }
  public boolean equals (Student other) {
    if (student_id == other.student_id)
       return true;
    else return false;
  }
}

public class Dept implements Comparable {
  public int dept_num;
  public String dept_name;

  public Dept(int num, String name) {
     dept_num=num;
     dept_name=name;
  }
  public boolean lessThan (Comparable other) {
    if (dept_num < ((Dept)other).dept_num)
       return true;
    else return false;
  }
  public boolean equals (Dept other) {
    if (dept_num == other.dept_num)
       return true;
    else return false;
  }
}

public class RegFiles
{
   
    public static String translate(int num, Vector depts) {
       int i;
       String n = "";
       for (i=0; i<depts.size(); i++)
           if (((Dept)depts.elementAt(i)).dept_num == num)
              n = ((Dept)depts.elementAt(i)).dept_name;
       return n;
    }

    public static void main(String args[])
    {
    Vector students = new Vector();
    Vector depts = new Vector();
    String line_in;
    String regline_out;
    int i;
    Integer j;
    Integer k;
 	
// load the student vector
    try {
        InputStream rg_student = new FileInputStream("rg_student");
      	ReadStream r = new ReadStream(rg_student);
 
	line_in = new String (r.readLine());
	// for each line of input
	i=0;
	while ( !r.eof() )
	{   if (i<30) System.out.println(line_in);
	    j = new Integer(line_in.substring(0,5));
	    k = new Integer(line_in.substring(5,7));
        students.addElement (new Student(j.intValue(), k.intValue()));
		line_in = r.readLine();
		i++;
	}
	r.close();
	} catch (IOException e) {
	   System.err.println(e);
	   return;
	}
	System.out.println("Student vector loaded");
	
// load the department vector
	try {
        InputStream rg_department = new FileInputStream("rg_department");
      	ReadStream r = new ReadStream(rg_department);
 
	line_in = r.readLine();
	// for each line of input
	i=0;
	while ( !r.eof() )
	{   if (i<30) System.out.println(line_in);
	    j = new Integer(line_in.substring(0,3));
        depts.addElement (new Dept(j.intValue(), line_in.substring(4,9)));
		line_in = r.readLine();
		i++;
	}
	r.close();
	} catch (IOException e) {
	   System.err.println(e);
	   return;
	}
	System.out.println("Department vector loaded");
	
// update the student vector with choices
	try {
        InputStream rg_course_tree = new FileInputStream("rg_course_tree");
      	ReadStream r = new ReadStream(rg_course_tree);
        String a_choice;
	line_in = r.readLine();
	int current_student_id = 1;
	Student current_student = (Student)students.elementAt (current_student_id-1);
	// for each line of input
	while ( !r.eof() )
	{
        if (!(line_in.substring(0,4).equals("    ")) && 
            !(line_in.substring(6,7).equals("L"))) {
           int h = (new Integer(line_in.substring(0,3))).intValue();  // dept number
           a_choice = translate(h, depts) + " " + line_in.substring(3,7);   // department name + course number
           int f = (new Integer(line_in.substring(19,20))).intValue(); // first line or alternate course
           Integer this_id = new Integer(line_in.substring(12,17));
           int t = this_id.intValue();                       // student id for this record
           if (current_student.student_id != t) {            // we have a different student
              students.setElementAt (current_student, current_student_id-1);
              current_student_id = t;                        // go for it                       
              current_student = (Student)students.elementAt (current_student_id-1);
           }
           String ss = new String(a_choice);
           (current_student.student_choices).addElement(ss);
           if (f == 1) 
              current_student.student_numDesired++;
           current_student.student_numChoices++;
        }
		line_in = r.readLine();
	}
	students.setElementAt(current_student, current_student_id-1);
	r.close();
	} catch (IOException e) {
	   System.err.println(e);
	   return;
	}

// write out the student vector
	try {
	    String s;
        FileOutputStream reg_cards = new FileOutputStream ("reg_cards");
        PrintStream pw = new PrintStream(reg_cards);
        for (i=0; i<students.size(); i++) {
         if (((Student)students.elementAt(i)).student_numDesired > 0) {
           s = ((Student)students.elementAt(i)).student_id + " " +
                            ((Student)students.elementAt(i)).student_class + " " +
                            ((Student)students.elementAt(i)).student_numDesired + " " + 
                            ((Student)students.elementAt(i)).student_numChoices + " ";
           if (i<30) System.out.print(s);
           pw.print(s);
           for (int jj=0; jj<((Student)students.elementAt(i)).student_choices.size(); jj++) {
              s = (((Student)students.elementAt(i)).student_choices).elementAt(jj) + " ";
           if (i<30)   System.out.print(s);
              pw.print(s);
           }
           if (i<30) System.out.println();
           pw.println();
         }
        }
        pw.close();
	} catch (IOException e) {
	   System.err.println(e);
	   return;
	}
}
}