/*
    2nd of 3 examples to demonstrate better method design
    Section 6.7 in the textbook
    This program is a VERY simple "accounting" program which simply
      prompts the user for "accout" information and stores the data
      in an array
    The goal is not to be useful, but to show good/bad method design
    This example uses better methods, and is easier to read/maintain.
*/

import java.util.*;

public class goodMethod {
    private Scanner easy;        // global easyin object
    private record[] database;      // global database array
    private int numRecords;         // global number of records variable

    /* Main method, only creates a new object and starts the program */
    public static void main(String[] args) {
        goodMethod gm = new goodMethod();
        gm.run();
    }

    /* This is the class' only public method.  This is where the work starts.
       The user is prompted to enter accounts, either by name or account number
       until they enter a number other than 1 or 2, then the program quits. */
    public void run() {
        /* assign and initialize the globals */
        easy = new Scanner(System.in);
        database = new record[100];
        numRecords = 0;

        int choice;     // holds answer to the first question

        for(;;) {   // infinite loop
            choice = promptInt("Will the record be by name or account number? [1,2]");

            /* The user has three options 1 is by name, 2 is by number, any other number
               means quit.  Entering something other than an integer will make the program
               crash */
            switch(choice) {
                case 1:
                    /* Now, each task has its own method */
                    getByName();
                    numRecords++;
                    break;
                case 2:
                    getByAcct();
                    numRecords++;
                    break;
                default:
                    System.out.println("Quitting.");
                    System.exit(1);
            }

            System.out.println("Entered "+numRecords+" records.");
        }
    }

    /* The following methods each create one new record, one by name, one by account */
    private void getByName() {
        String input;
        int dollars;
        record tempRec;

        input = promptString("Enter the name.");
        easy.nextLine();
        dollars = promptInt("Enter the dollar amount.");
        tempRec = new record();
        tempRec.name = input;
        tempRec.value = dollars;
        database[numRecords] = tempRec;
    }
    private void getByAcct() {
        int account;
        int dollars;
        record tempRec;

        account = promptInt("Enter the account number.");
        dollars = promptInt("Enter the dollar amount.");
        tempRec = new record();
        tempRec.account = account;
        tempRec.value = dollars;
        database[numRecords] = tempRec;
    }

    /* The following methods each prompt the user for something
       The text of the question is passed as a parameter, and they return
         the result of the query.
       These are used all over the rest of the program.  By having them be
         separate methods, changes to the way the program prompts the user
         are much easier to implement.  */
    private int promptInt(String text) {
        int num;
        System.out.println(text);
        System.out.print("> ");
        num = easy.nextInt();
        return num;
    }
    private String promptString(String text) {
        String str;
        System.out.println(text);
        System.out.print("> ");
        str = easy.nextLine();
        return str;
    }

    /* this private class is simply a container for the account variables */
    private class record {
        public String name;
        public int account;
        public int value;
    }
}