/*
    EmployeeControlBreakReportR.java
    CIS 111
    Dave Klick
    2013-11-23
    
    Reads in R/A file data, creates Employee objects,
    stores them in an ArrayList, and then sorts and displays
    the data in a control break report.
*/
import java.util.ArrayList;
import java.util.Collections;

// CIS111App requires a class to represent a R/A record
// This class represents a fixed-length record on disk
class Employee implements Comparable<Employee> {
    String name = "12345678901234567890";
    String dept = "12345";
    double rate;

    // Default constructor for Employee objects
    // Used for: new Employee()
    public Employee() { }
    
    // Constructor for Employee objects
    // Used for: new Employee(String, String, double)
    public Employee(String nm, String dp, double rt) {
        name = nm;
        dept = dp;
        rate = rt;
    }

    // Implementation of Comparable interface
    // This is required for built-in sort in Collections
    public int compareTo(Employee e) {
        int n = dept.compareToIgnoreCase(e.dept);
        if (n == 0) n = name.compareToIgnoreCase(e.name);
        return n;
    }
}
    
public class EmployeeControlBreakReportR extends CIS111App {
    public static void main(String[] args) {
        // An example Employee object is needed for CIS111App R/A
        Employee rec = new Employee();
        // This opens the file for both R/A input and output
        RandomFile<Employee> file = new RandomFile<Employee>("emp.jmg", rec);
        // Get number of records already in file
        // Note: record numbering starts at 1
        int numrecs = (int) (file.numberOfRecords());
        
        // Create an ArrayList to hold Employee objects
        ArrayList<Employee> list = new ArrayList<Employee>();

        // Read records into the ArrayList
        for (int recnum=1; recnum<=numrecs; recnum++) {
            list.add((Employee) file.get(recnum));
        }
        file.close();
        
        // sort records
        Collections.sort(list);
        
        // do control break report - average rate per department
        String prevDept = "!!!!!";
        double deptRate = 0.0;
        int deptCount = 0;
        double totalRate = 0.0;
        int totalCount = 0;
        
        // display headings
        println("Name        Dept       Rate");
        println("----------  ------  -------");

        for (Employee emp : list) {
            // control break - show average for department
            if (!prevDept.equalsIgnoreCase(emp.dept) && totalCount>0) {
                printf("Department Average: %7.2f\n\n", deptRate / deptCount);
                totalRate += deptRate;
                deptCount = 0;
                deptRate = 0.0;
            }
            
            // display detail for each record
            printf("%-10s  %-6s  %7.2f\n", trim$(emp.name), trim$(emp.dept), emp.rate);

            // update totals
            prevDept = emp.dept;
            deptCount++;
            deptRate += emp.rate;
            totalCount++;
        }
        
        // control break - show average for last department
        printf("Department Average: %7.2f\n\n", deptRate / deptCount);
        totalRate += deptRate;

        // show average for all records
        printf("Company Average:    %7.2f\n\n", totalRate / totalCount);
    }
}