/*   LibraryLocator.java
 *   May 10, 2003
 */
 
import java.io.*;
 
/** LibraryLocator.java determines the correct location 
 *  in which to shelve a library book. The application 
 *  continues to ask the user to enter call numbers and 
 *  displays either locations or error messages until 
 *  the user enters zero for the call number. At that 
 *  point, the application displays a message thanking 
 *  the user for using the program and a listing 
 *  of the number of call numbers that were entered 
 *  by the user that belong in the basement, the 
 *  number that belong in the archives, the number 
 *  that belong on the main floor, the number that 
 *  belong on the upper floor, and the number that 
 *  were incorrect. The program then ends. It does 
 *  not display either a location or an error 
 *  message when the zero is entered.
 */
public class LibraryLocator{
 
    /** Constructs a LibraryLocator which handles the 
    *   user interaction.
    */
    public LibraryLocator(){
        try{
            InputStreamReader isr = new InputStreamReader(System.in);
            BufferedReader br = new BufferedReader(isr);
            String lineRead = "";
            System.out.println("Enter a book call number or 0 to stop:");
            int basement = 0;
            int mainFloor = 0;
            int archives = 0;
            int upperFloor = 0;
            int errors = 0;
            while (!(lineRead = br.readLine()).equals("0")){
                String bookLocation = getBookLocation(lineRead);
                if ((bookLocation != null) && (bookLocation.length() > 0)){
                    System.out.println("The library location for book number " 
                    + lineRead + " is " + bookLocation + ".");
                    if (bookLocation.equals("Basement")){
                        basement++;
                    }else if (bookLocation.equals("Main Floor")){
                        mainFloor++;
                    }else if (bookLocation.equals("Archives")){
                        archives++;
                    }else if (bookLocation.equals("Upper Floor")){
                        upperFloor++;
                    }
                }else{
                    errors++;
                }
                System.out.println("Enter a book call number or 0 to stop:");
            }
            System.out.println("Thanks for using the libray book locator.");
            System.out.println("There were " + String.valueOf(basement) 
                + " calls for the basement.");
            System.out.println("There were " + String.valueOf(archives) 
                + " calls for the archives.");
            System.out.println("There were " + String.valueOf(mainFloor) 
                + " calls for the main floor.");
            System.out.println("There were " + String.valueOf(upperFloor) 
                + " calls for the upper floor.");
            System.out.println("There were " + String.valueOf(errors) 
                + " incorrect calls.");
           
        }catch(IOException ioe){
            System.err.println("IOException: " + ioe.getMessage());
        }
    }
    
    /** Runs the application.
     */
    public static void main(String[] args){
        new LibraryLocator();
    }
    
    /** Determines locations from call numbers:
     *  100 to 199 basement
     *  200 to 500 and over 900 main floor
     *  501 to 900 except 700 to 750 upper floor
     *  700 to 750 archives
     *  greater than 999 or less than 100 is an error
    */
    public String getBookLocation(String numberString){
        int bookNumber = toInt(numberString);
        String location = "";
        if ((bookNumber >= 100) && (bookNumber <= 999)){
            if ((bookNumber >= 100) && (bookNumber <= 199)){
                location = "Basement";
            }else if ((bookNumber >= 200) && (bookNumber <= 500)){
                location = "Main Floor";
            }else if ((bookNumber >= 501) && (bookNumber <= 699)){
                location = "Upper Floor";
            }else if ((bookNumber >= 700) && (bookNumber <= 750)){
                location = "Archives";
            }else if ((bookNumber >= 751) && (bookNumber <= 900)){
                location = "Upper Floor";
            }else if ((bookNumber >= 751) && (bookNumber <= 999)){
                location = "Main Floor";
            }   
        }else{
            System.out.println("Error Try again.");
        }
        return location;
    }
    
    /** Converts a string object to an int primitive 
     *  or returns -1 if an invalid integer string 
     * is entered.
     */
    private int toInt(String s){
        int n = -1;
        try{
            n = Integer.parseInt(s);
        }catch(NumberFormatException nfe){
            System.err.println("That was not a valid book number");
        }
        return n;
    }
}