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package in.shop2020.serving.controllers;
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import java.util.Map;
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import java.util.StringTokenizer;
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import in.shop2020.model.v1.user.ShoppingCartException;
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import in.shop2020.model.v1.user.UserContextService;
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import in.shop2020.serving.controllers.BaseController;
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import in.shop2020.thrift.clients.UserContextServiceClient;
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import org.apache.log4j.Logger;
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import org.apache.struts2.convention.annotation.Result;
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import org.apache.struts2.interceptor.ParameterAware;
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import org.apache.thrift.TException;
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@Result(name="redirect", type="redirectAction",
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   		params = {"actionName" , "cart"})
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public class CartController extends BaseController implements ParameterAware{
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	private static final long serialVersionUID = 1L;
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	private static Logger log = Logger.getLogger(Class.class);
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	Map<String, String[]> reqparams = null;
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	private String errorMsg = "";
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	public CartController(){
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		super();
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	}
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	 // GET /cart
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	 public String index() {
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    	try {
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			UserContextService.Client userClient = (new UserContextServiceClient()).getClient();
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			if(!userClient.validateCart(userinfo.getCartId()))
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				errorMsg = "Your cart has been updated.";
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		} catch (Exception e) {
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			// This exception can be ignored for showing the cart. Not so
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			// innocent when this occurs at the time of checkout or when the
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			// user is proceeding to pay.
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			e.printStackTrace();
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		}
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		htmlSnippets.put("CART_HEADER", pageLoader.getCartHeaderHtml());
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		htmlSnippets.put("CART_DETAILS", pageLoader.getCartDetailsHtml(userinfo.getUserId(), userinfo.getCartId(), errorMsg));
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    	return "index";
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	 }
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	// POST /entity
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	public String create() {
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		log.info("CartController.create");
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		printParams();
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		long userId = userinfo.getUserId();
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		long cartId = userinfo.getCartId();
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		log.info("item id is " + this.reqparams.get("productid"));
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		String itemIds = "";
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		if (this.reqparams.get("productid") != null) {
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			itemIds = this.reqparams.get("productid")[0];
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		}else{
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			return "failure";
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		}
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		StringTokenizer tokenizer = new StringTokenizer(itemIds, "_");
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		while (tokenizer.hasMoreTokens()) {
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			long itemId = Long.parseLong(tokenizer.nextToken());
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			try {
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				UserContextServiceClient userServiceClient = new UserContextServiceClient();
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				UserContextService.Client userClient = userServiceClient.getClient();
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				if (cartId == 0){
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					cartId = userClient.createCart(userId);
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				}
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				userClient.addItemToCart(cartId, itemId, 1);
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				userinfo.setCartId(cartId);
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				int totalItems = userClient.getCart(cartId).getLinesSize();
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				userinfo.setTotalItems(totalItems);
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			} catch (TException e) {
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				e.printStackTrace();
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			} catch (Exception e) {
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				e.printStackTrace();
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			}
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		}
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		return "success";
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	}
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		// DELETE /entity
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		public String destroy() {
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	    	log.info("CartController.destroy");
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	    	printParams();
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	    	log.info("item id is " + this.request.getParameter("productid"));
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			String itemIdString = this.request.getParameter("productid");
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			long itemId = Long.parseLong(itemIdString);
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			if(userinfo.getCartId() == -1){
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				log.info("Cart does not exist. Nothing to delete.");
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			}else{
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				if(deleteItemFromCart(userinfo.getCartId(), itemId, userinfo.getUserId(), userinfo.isSessionId())){
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					userinfo.setTotalItems(getNumberOfItemsInCart(userinfo.getCartId()));
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					return "redirect";
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				}
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			}
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			return "redirect";
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		}
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		// DELETE /entity
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		public String update() {
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	    	log.info("CartController.update");
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	    	printParams();
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	    	log.info("item id is " + this.request.getParameter("productid"));
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	    	log.info("item id is " + this.request.getParameter("quantity"));
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			String itemIdString = this.request.getParameter("productid");
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			String quantityString = this.request.getParameter("quantity");
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			long itemId = Long.parseLong(itemIdString);
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			long quantity = Long.parseLong(quantityString);
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			if(quantity <= 0){
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				log.info("Not valid item quantity. Unable to change item quantity.");
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			}else{
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				if(updateItemQuantityInCart(userinfo.getCartId(), itemId, quantity)){
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					return "redirect";
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				}
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			}
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			addActionError("Unable to update the quantity");
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			return "redirect";
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		}
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    public void printParams(){
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    	for(String param : reqparams.keySet()) {
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    		log.info("param name is " + param);
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    		log.info("param first is " + reqparams.get(param)[0]);
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    	}
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    	log.info(this.reqparams);
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    }
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	private boolean updateItemQuantityInCart(long cartId, long itemId, long quantity){
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		try {
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			UserContextServiceClient userContextServiceClient = new UserContextServiceClient();
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			in.shop2020.model.v1.user.UserContextService.Client userClient = userContextServiceClient.getClient();
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			userClient.changeQuantity(cartId, itemId, quantity);
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			return true;
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		} catch (ShoppingCartException e) {
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			e.printStackTrace();
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		} catch (TException e) {
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			e.printStackTrace();
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		} catch (Exception e) {
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			e.printStackTrace();
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		}
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		return false;
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	}
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	private boolean deleteItemFromCart(long cartId, long catalogItemId, long userId, boolean isSessionId){
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		try {
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			UserContextServiceClient userContextServiceClient = new UserContextServiceClient();
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			in.shop2020.model.v1.user.UserContextService.Client userClient = userContextServiceClient.getClient();
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			userClient.deleteItemFromCart(cartId, catalogItemId);
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			return true;
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		} catch (ShoppingCartException e) {
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			e.printStackTrace();
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		} catch (TException e) {
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			e.printStackTrace();
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		} catch (Exception e) {
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			e.printStackTrace();
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		}
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		return false;
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	}
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	private int getNumberOfItemsInCart(long cartId) {
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		int numberOfItems = 0;
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		UserContextServiceClient userContextServiceClient = null;
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		try {
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			userContextServiceClient = new UserContextServiceClient();
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			in.shop2020.model.v1.user.UserContextService.Client userClient = userContextServiceClient.getClient();
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			numberOfItems = userClient.getCart(cartId).getLinesSize();
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		} catch (ShoppingCartException e) {
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			e.printStackTrace();
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		} catch (TException e) {
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			e.printStackTrace();
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		} catch (Exception e) {
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			e.printStackTrace();
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		}
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		return numberOfItems;
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	}
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	public String getCartHeaderSnippet(){
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		return htmlSnippets.get("CART_HEADER");
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	}
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	public String getCartDetailsSnippet(){
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		return htmlSnippets.get("CART_DETAILS");
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	}
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	public long getNumberOfItems(){
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		return userinfo.getTotalItems();
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	}
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	@Override
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	public void setParameters(Map<String, String[]> parameters) {
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		this.reqparams = parameters;
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	}
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}