/** ***************************************Seller*************************************************** */
class Seller implements Comparable<Seller> {
    private int id;
    private ArrayList<Product> products;
    private Intermediary intermediary;// 

    private Seller(int id) {
    this.id = id;
    init();
    }

    private Seller(int id, ArrayList<Product> products,
        Intermediary intermediary) {
    this.id = id;
    this.products = products;
    this.intermediary = intermediary;
    init();
    }

    private void init() {
    if (products == null)
        products = new ArrayList<Product>();
    if (intermediary == null)
        intermediary = Intermediary.createIntermediary(0);
    }

    public static Seller createSeller(int id) {
    return new Seller(id);
    }

    public static Seller createSeller(int id, ArrayList<Product> products,
        Intermediary intermediary) {
    return new Seller(id, products, intermediary);
    }

    boolean add(Product product) {// new arrivals
    return products.add(product);
    }

    boolean remove(Product product) {// take out of
    return products.remove(product);
    }

    public Product getProduct(int id) {// display product
    for (int i = 0; i < products.size(); i++) {
        if (products.get(i).getId() == id)
        return products.get(i);
    }
    return null;
    }

    public void displayProductInStore() {// display product
    for (int i = 0; i < products.size(); i++) {
        System.out.println(products.get(i));
    }
    }

    public int compareTo(Seller seller) {
    int temp = id > seller.id ? 1 : (id == seller.id ? 0 : -1);
    return temp;
    }

    public Intermediary getIntermediary() {
    return intermediary;
    }

    public void setIntermediary(Intermediary intermediary) {
    this.intermediary = intermediary;
    }

    public int getId() {
    return id;
    }

    public void setId(int id) {
    this.id = id;
    }

    public ArrayList<Product> getProducts() {
    return products;
    }

    public void setProducts(ArrayList<Product> products) {
    this.products = products;
    }

    public String toString() {
    return getClass().getSimpleName() + id;
    }

}

/** ***************************************Buyer*************************************************** */

class Buyer implements Comparable<Buyer> {
    private int id;
    private ArrayList<Product> products;
    private Seller seller;//
    private Intermediary intermediary;//

    private Buyer(int id) {
    this.id = id;
    init();
    }

    private Buyer(int id, ArrayList<Product> products, Seller seller,
        Intermediary intermediary) {
    super();
    this.id = id;
    this.products = products;
    this.seller = seller;
    this.intermediary = intermediary;
    init();
    }

    private void init() {
    if (products == null)
        products = new ArrayList<Product>();
    if (seller == null)
        seller = Seller.createSeller(0);
    if (intermediary == null)
        intermediary = Intermediary.createIntermediary(0);
    }

    public static Buyer createBuyer(int id) {
    return new Buyer(id);
    }

    public static Buyer createBuyer(int id, ArrayList<Product> products,
        Seller seller, Intermediary intermediary) {
    return new Buyer(id, products, seller, intermediary);
    }

    public void add(int id, String name, String descreption) {// add
    products.add(Product.createProduct(id, name, descreption));
    }

    public void add(Product product) {// add seller's product to shoppincar
    if (product != null)
        products.add(product);
    else
        throw new UnsupportedOperationException();
    }

    public boolean remove(int id) {// remove product from shopping car
    for (int i = 0; i < products.size(); i++) {
        if (products.get(i).getId() == id) {
        products.remove(id);
        return true;
        }
    }
    return false;
    }

    boolean remove(Product product) {// remove product from shopping car
    return products.remove(product);
    }

    public Product getProduct(int id) {
    for (Product product : products) {
        if (product.getId() == id)
        return product;
    }
    return null;
    }

    public void displayProductInShoppingCar() {// display products in`shopping
    // car
    for (Product product : products) {
        System.out.println(product);
    }
    }

    public void displayProductFromSeller() {
    seller.displayProductInStore();
    }

    public void displaySellerFromIntermediary() {
    intermediary.displaySeller();
    }

    public void buy(Product product) {// buy thing
    intermediary.trade(seller, this, product);
    }

    public int compareTo(Buyer buyer) {
    int temp = id > buyer.id ? 1 : (id == buyer.id ? 0 : -1);
    return temp;
    }

    public int getId() {
    return id;
    }

    public void setId(int id) {
    this.id = id;
    }

    public Seller getSeller() {
    return seller;
    }

    public void setSeller(Seller seller) {
    this.seller = seller;
    }

    public Intermediary getIntermediary() {
    return intermediary;
    }

    public void setIntermediary(Intermediary intermediary) {
    this.intermediary = intermediary;
    }

    public ArrayList<Product> getProducts() {
    return products;
    }

    public void setProducts(ArrayList<Product> products) {
    this.products = products;
    }

    public String toString() {
    return getClass().getSimpleName() + id;
    }
}

/** ***************************************Product*************************************************** */
class Product {
    private final int id;// 每件商品ID是唯一的
    private String name;
    private String description;

    private Product(int id) {
    super();
    this.id = id;
    init();
    }

    private Product(int id, String name, String description) {
    super();
    this.id = id;
    this.name = name;
    this.description = description;
    init();
    }

    private void init() {
    if (name == null)
        name = "name" + id;
    if (description == null)
        description = "description" + id;
    }

    public static Product createProduct(int id) {
    return new Product(id);
    }

    public static Product createProduct(int id, String name, String description) {
    return new Product(id, name, description);
    }

    public int getId() {
    return id;
    }

    public String getName() {
    return name;
    }

    public void setName(String name) {
    this.name = name;
    }

    public String getDescription() {
    return description;
    }

    public void setDescription(String description) {
    this.description = description;
    }

    public String toString() {
    return getClass().getSimpleName() + id;
    }
}