package ajax.biz;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

public class ShoppingCart {
	private Map cartMap = null;	//保存Product的Map

	/**
	 * 購物車構(gòu)造函數(shù)
	 */
	public ShoppingCart() {
		cartMap = new HashMap();
	}

	/**
	 * 檢查是否購物車內(nèi)已存在該產(chǎn)品
	 */
	public boolean existProduct(String productId) {
		Iterator hmKey = cartMap.keySet().iterator();
		while (hmKey.hasNext()) {
			String hmId = (String) hmKey.next();
			if (hmId.equals(productId)) {
				return true;
			}
		}
		return false;
	}

	/**
	 * 取得存放產(chǎn)品的cartMap
	 */
	public Map getCartMap() {
		return cartMap;
	}

	/**
	 * 取得購物車內(nèi)產(chǎn)品總數(shù)量
	 */
	public int getProductsNum() {
		int productNum = 0;
		Iterator hmEntry = cartMap.values().iterator();
		while (hmEntry.hasNext()) {
			productNum += ((Product) hmEntry.next()).getProductsNum();
		}
		return productNum;
	}

	/**
	 * 添加產(chǎn)品進(jìn)購物車
	 */
	public boolean addProduct(String productId) {
		if (existProduct(productId)) {// 產(chǎn)品已存在則增加數(shù)量
			Product product = (Product) cartMap.get(productId);
			product.setProductsNum(product.getProductsNum() + 1);
			return true;
		} else {// 否則新加入該產(chǎn)品
			Product product = new Product(productId);
			if (product.getProductId() == null) {
				return false;
			} else {
				cartMap.put(productId, product);
				return true;
			}
		}
	}

	/**
	 * 刪除購物車內(nèi)產(chǎn)品
	 */
	public void delProduct(String productId) {
		cartMap.remove(productId);
	}

	/**
	 * 取得購物車內(nèi)產(chǎn)品總計(jì)金額
	 */
	public double getTotalPrice() {
		double totalPrice = 0;
		Iterator hmEntry = cartMap.values().iterator();
		while (hmEntry.hasNext()) {
			Product product = (Product) hmEntry.next();
			totalPrice += product.getProductsNum() * product.getProductPrice();
		}
		return totalPrice;
	}

	/**
	 * 清空購物車
	 */
	public void clearProduct() {
		cartMap.clear();
	}

}