// This file contains excerpts from the textbook Concrete
// Abstractions: An Introduction to Computer Science Using Scheme, by
// Max Hailperin, Barbara Kaiser, and Karl Knight, Copyright (c) 1998
// by the authors. Full text is available for free at
// http://www.gustavus.edu/+max/concrete-abstractions.html

public class CompuDuds {

  public static void displayPrice(int totalCents){
    int dollars = totalCents / 100;
    int remainingCents = totalCents % 100;
    System.out.print("$");
    System.out.print(dollars);
    if(remainingCents < 10){
      System.out.print(".0");
    } else {
      System.out.print(".");
    }
    System.out.print(remainingCents);
  }

  public static void main(String[] commandLineArgs){
    ItemList itemList = new ItemList();
    while(true){ // infinite loop terminated by program exiting
      System.out.println();
      System.out.println("What would you like to do?");
      System.out.println(" 1) Exit this program.");
      System.out.println(" 2) Add an item to your selections.");
      System.out.println(" 3) List the items you have selected.");
      System.out.println
        (" 4) See the total price of the items you selected.");
      int option;
      if(itemList.empty()){
        option = inputIntegerInRange(1, 4);
      } else {
        System.out.println(" 5) Delete one of your selections.");
        System.out.println
          (" 6) Revise specifics of a selected item.");
        option = inputIntegerInRange(1, 6);
      }
      if(option == 1){
        System.exit(0);
      } else if(option == 2){
        Item item = inputItem();
        itemList.add(item);
        item.inputSpecifics();
      } else if(option == 3){
        itemList.display();
      } else if(option == 4){
        displayPrice(itemList.totalPrice());
        System.out.println();
      } else if(option == 5){
        itemList.delete(itemList.choose());
      } else if(option == 6){
        itemList.choose().reviseSpecifics();
      }
    }
  }

  private static Item inputItem(){
    System.out.println("What would you like?");
    System.out.println(" 1) Chinos");
    System.out.println(" 2) Oxford shirt");
    if(inputIntegerInRange(1, 2) == 1){
      return new Chinos();
    } else{
      return new OxfordShirt();
    }
  }

  private static java.io.BufferedReader reader =
   new java.io.BufferedReader
    (new java.io.InputStreamReader(System.in));

  public static int inputIntegerInRange(int min, int max){
    System.out.print("(enter ");
    System.out.print(min);
    System.out.print("-");
    System.out.print(max);
    System.out.println(")");
    String inputAsString = null;
    try{
      inputAsString = reader.readLine();
    } catch(java.io.IOException e){
      System.err.print("Problem reading input: ");
      System.err.println(e);
      System.exit(1);
    }
    if(inputAsString == null){ // this means end of file on input
      System.exit(0);  // handle as a normal program termination
    }
    int inputAsInt;
    try{
      inputAsInt = Integer.parseInt(inputAsString);
    } catch(NumberFormatException e){
      System.err.println("input must be an integer and wasn't");
      return inputIntegerInRange(min, max);
    }
    if(inputAsInt < min || inputAsInt > max){
      System.err.println("input out of range");
      return inputIntegerInRange(min, max);
    } else{
      return inputAsInt;
    }
  }

  public static String inputSelection(String[] choices){
    for(int number = 1; number <= choices.length; number = number + 1){
      System.out.print(" ");
      System.out.print(number);
      System.out.print(") ");
      System.out.println(choices[number - 1]);
    }
    return choices[inputIntegerInRange(1, choices.length) - 1];
  }
}