/*
 * MrsFields.java
 *
 * Created on April 24, 2002, 11:43 PM
 */
import javax.swing.*;
/**
 *
 * @author  mike
 * @version 
 */
public class MrsFields {

    private int inventory = 0;
    
    private int numSold = 0;
    
    private double profitMargin = .50;
    
    /** 
     * Creates default new MrsFields 
     */
    public MrsFields() {
    }

    /** 
     * Creates new MrsFields - with non defaults
     */
    // left for students to do !!
    }
        
    /**
     * report current inventory
     */
    public int getCurrInv() {
        return inventory;
    }
    
    /**
     * report number sold so far
     */
    public int getSold() {
        return numSold;
    }
    
    /**
     * report starting inventory
     */
    public int getStart() {
        int start = inventory + numSold;
        return start;
    }
    
    /**
     * report amount of profit per cookie
     */
    public double getMargin() {
        return profitMargin;
    }
    
    /**
     * report total profit for the day
     */
    public double getTotalProfit() {
        double profit = profitMargin * numSold;
        return profit;
    }
    
    /**
     * Change current inventory levels 
     * Probably should not be allowed to be called directly
     * Checks to ensure don't take inventory negative
     */
    private void setCurrInv(int num) {
        // don't allow negative inventory
        if (num >= 0) {
            inventory = num;
        }
        else {
            JOptionPane.showMessageDialog(null,"Inventory remains unchanged after attempt to set to negative");
        }
    }
    
    /**
     * Change number sold
     * Probably should not be allowed to be called directly
     * Checks to ensure don't take num sold negative
     */
    private void setSold(int num) {
        // don't allow negative number sold
        if (num >= 0) {
            numSold = num;
        }
        else {
            JOptionPane.showMessageDialog(null,"Number sold remains unchanged after attempt to set to negative");
        }
    }
    
    /**
     * Change profit margin 
     * Checks to ensure don't take margin negative
     */
    public void setMargin(double amt) {
        // don't allow negative profit margin
        if (amt >= 0) {
            profitMargin = amt;
        }
        else {
            JOptionPane.showMessageDialog(null,"Profit margin remains unchanged after attempt to set to negative");
        }
    }
    
    /**
     * Sell given number of cookies - reflecting in instance variables
     * First ensure that that many are available
     */
    public boolean sell(int num) {
        // don't allow negative sale
        if (num <= 0) {
            JOptionPane.showMessageDialog(null,"No Cookies sold due to attempt to sell negative number of cookies");
            return false; // couldn't sell
        }
        // dont allow selling more than we have
        else if (num > inventory) {
            JOptionPane.showMessageDialog(null,"No Cookies sold due to attempt to sell more cookies than are available");
            return false; // couldn't sell
        }
        else {
            // sell them
            inventory = inventory - num;
            numSold = numSold + num;
            return true;
        }
            
    }
    
    public static void main(String args[]) {
        MrsFields myStore = new MrsFields();
        System.out.println(myStore.getCurrInv());
        int x;
        System.exit(0);
    }
    
}