// Lecture 4 
// CS U213 Fall 2008
// bookstore-methods1.java
/*
;; A Book is (make-book String String Num Symbol)
;; There are three kinds of books: fiction, nonfiction, textbook
;; represented by symbols 'F 'N 'T
(define-struct book (title author price kind))

;; Examples of books
(define oms (make-book "Old Man and the Sea" "EH" 10 'F))
(define eos (make-book "Elements of Style" "EBW" 20 'N))
(define htdp (make-book "HtDP" "MF" 60 'T))
*/

/*
 +---------------+
 | Book          |
 +---------------+
 | String title  |
 | String author |
 | int price     |
 | char kind     |
 +---------------+  
*/

// to represent a book in a bookstore
class Book{
  String title;
  String author;
  int price;
  char kind;
  
  Book(String title, String author, int price, char kind){
    this.title = title;
    this.author = author;
    this.price = price;
    this.kind = kind;    
  }

/* TEMPLATE:
    ... this.title ...              -- String
    ... this.author ...             -- String
    ... this.price ...              -- int
    ... this.kind ...               -- char
  
    ... this.writtenBy(String) ...  -- boolean
    ... this.salePrice() ...        -- int
    ... this.sameAuthor(Book) ... -- boolean
*/

  // was this book written by the given author?
  boolean writtenBy(String author){
    return this.author.equals(author);
  }
  
/*  
 the sale price of the book depends on the daily discounts
 these may differ depending on the kind of book
 suppose today we have the following discounts:
 there is 30% discount on fiction books
 there is 20% discount on nonfiction books
 textbooks sell at full price
*/
  
  // compute the discounted sale price for this book
  int salePrice(){    
    if (this.kind == 'F'){
        return this.price - 3 * (this.price / 10);
    } else {if (this.kind == 'N'){
        return this.price - 2 * (this.price / 10);
    } else {
        return this.price;
    }}
  }
  
  // was this book written by the same author as the given book?
  boolean sameAuthor(Book that){
    return this.author.equals(that.author);
  }
}

class Examples{
  Examples(){}
  
  Book oms = new Book("Old Man and the Sea", "EH", 10, 'F');
  Book eos = new Book("Elements of Style", "EBW", 20, 'N');
  Book htdp = new Book("HtDP", "MF", 60, 'T');
  Book ll = new Book("LL", "MF", 20, 'N');

  
  // test the method writtenBy in the class Book
  boolean testWrittenBy =
    (check this.oms.writtenBy("EH") expect true) &&
    (check this.eos.writtenBy("EH") expect false) &&
    (check this.htdp.writtenBy("MF") expect true);
  
  // test the method salePrice in the class Book
  boolean testSalePrice =
    (check this.oms.salePrice() expect 7) &&
    (check this.eos.salePrice() expect 16) &&
    (check this.htdp.salePrice() expect 60);

  
  // test the method sameAuthor in the class Book
  boolean testSameAuthor =
    (check this.oms.sameAuthor(this.eos) expect false) &&
    (check this.eos.sameAuthor(this.ll) expect false) &&
    (check this.htdp.sameAuthor(this.ll) expect true);
}