lab07 decomp

import java.io.FileNotFoundException;
import java.io.PrintStream;
import java.util.Comparator;
import java.util.Scanner;
import javax.swing.JOptionPane;

public class Driver07
{
  public Driver07() {}

  public static void main(String[] args)
  {
    Salesperson[] array = input("data.txt");
    menu(array);
    System.exit(0);
  }

  public static Salesperson[] input(String filename) {
    Scanner infile = null;
    try {
      infile = new Scanner(new java.io.File(filename));
    }
    catch (FileNotFoundException e)
    {
      JOptionPane.showMessageDialog(null, "The file could not be found.");
      System.exit(0);
    }

    int numitems = infile.nextInt();
    Salesperson[] array = new Salesperson[numitems];
    for (int k = 0; k < numitems; k++)
    {
      String x = infile.next();
      int y = infile.nextInt();
      int z = infile.nextInt();
      array[k] = new Salesperson(x, y, z);
    }
    infile.close();
    return array;
  }

  public static void menu(Salesperson[] array) {
    int choice = 0;
    while (choice != 7)
    {
      String message = "";
      message = message + "\n1. List Alphabetically.";
      message = message + "\n2. List by Cars Sold.";
      message = message + "\n3. List by Trucks Sold.";
      message = message + "\n4. List by Total Sales.";
      message = message + "\n5. Add Sales.";
      message = message + "\n6. Save data to file.";
      message = message + "\n7. Quit.";
      choice = Integer.parseInt(JOptionPane.showInputDialog(message));
      switch (choice) {
      case 1:
        display(array, new ByName());
        break;
      case 2:  display(array, new ByCars());
        break;
      case 3:  display(array, new ByTrucks());
        break;
      case 4:  display(array, new ByTotalSales());
        break;
      case 5:  add(array);
        break;
      case 6:  save(array);
        break;
      case 7:
        for (int k = 0; k < 25; k++)
          System.out.println();
        System.out.println("Bye-bye!");
        break;
      default:  System.out.println("Not a valid selection.");
      }

      System.out.println();
    }

    System.exit(0);
  }

  public static void save(Salesperson[] array) {
    PrintStream outfile = null;
    try {
      outfile = new PrintStream(new java.io.FileOutputStream("data.txt"));
    }
    catch (FileNotFoundException e)
    {
      JOptionPane.showMessageDialog(null, "The file could not be created.");
    }

    outfile.println(array.length);
    for (int k = 0; k < array.length; k++)
    {
      outfile.println(array[k].getName() + "\n" + array[k].getCars() + "\n" + array[k].getTrucks());
    }



    outfile.close();

    for (int k = 0; k < 25; k++)
      System.out.println();
    System.out.println("Saved.");
  }

  public static void add(Salesperson[] array)
  {
    int pos;
    do
    {
      String name = JOptionPane.showInputDialog("What salesperson?");
      pos = search(array, name);
    } while (pos == -1);
    String type;
    do {
      type = JOptionPane.showInputDialog("Cars or trucks?");
      type = type.toLowerCase();
    } while ((!type.equals("cars")) && (!type.equals("trucks")));
    int amount;
    do {
      amount = Integer.parseInt(JOptionPane.showInputDialog("How many " + type + "?"));

    }
    while (amount <= 0);
    if (type.equals("cars")) {
      array[pos].setCars(array[pos].getCars() + amount);
    } else {
      array[pos].setTrucks(array[pos].getTrucks() + amount);
    }
    for (int k = 0; k < 25; k++)
      System.out.println();
    System.out.println("Sales added.");
  }

  public static int search(Salesperson[] array, String name) {
    for (int k = 0; k < array.length; k++)
      if (name.equals(array[k].getName()))
        return k;
    return -1;
  }

  public static void display(Salesperson[] array, Comparator c) {
    sort(array, c);
    for (int k = 0; k < 25; k++)
      System.out.println();
    System.out.println("Name\tCars\tTrucks\tTotal");
    System.out.println("-----------------------------");
    for (int k = 0; k < array.length; k++) {
      System.out.println(array[k].getName() + "\t" + array[k].getCars() + "\t" + array[k].getTrucks() + "\t" + (array[k].getCars() + array[k].getTrucks()));
    }
  }

  public static void sort(Object[] array, Comparator c)
  {
    for (int k = 0; k < array.length; k++)
    {
      int minPos = findMin(array, array.length - k, c);
      swap(array, minPos, array.length - k - 1);
    }
  }

  private static int findMin(Object[] array, int upper, Comparator c) {
    int minPos = 0;
    for (int j = 1; j < upper; j++)
      if (c.compare(array[j], array[minPos]) < 0)
        minPos = j;
    return minPos;
  }

  private static void swap(Object[] array, int a, int b) {
    Object temp = array[a];
    array[a] = array[b];
    array[b] = temp;
  }
}