Internet-Technologien/src/main/java/de/hsel/itech/jsf/CartBean.java

package de.hsel.itech.jsf;

import de.hsel.itech.db.Database;
import de.hsel.itech.db.pojo.*;
import lombok.Setter;
import org.jetbrains.annotations.NotNull;

import javax.faces.annotation.ManagedProperty;
import javax.faces.application.FacesMessage;
import javax.faces.bean.ManagedBean;
import javax.faces.bean.SessionScoped;
import javax.faces.context.FacesContext;
import javax.faces.event.PhaseId;
import javax.faces.event.ValueChangeEvent;
import java.sql.Date;
import java.util.ArrayList;
import java.util.List;

@ManagedBean
@SessionScoped
public class CartBean {

    @Setter
    @ManagedProperty("#{userBean.user}")
    private User user;

    public User getUser() {
        FacesContext context = FacesContext.getCurrentInstance();
        return (User) context.getApplication().evaluateExpressionGet(context, "#{userBean.user}", User.class);
    }

    public Payment getPayment () {
        FacesContext context = FacesContext.getCurrentInstance();
        return (Payment) context.getApplication().evaluateExpressionGet(context, "#{paymentBean.selected}", Payment.class);
    }

    public Address getAddress() {
        FacesContext context = FacesContext.getCurrentInstance();
        return (Address) context.getApplication().evaluateExpressionGet(context, "#{addressBean.selected}", Address.class);
    }

    @Setter
    private List<ShoppingCartItem> items;

    public String add(Book book) {
        if (getUser() != null && getUser().getId() != 0) {
            for (ShoppingCartItem item : getItems()) {
                if (item.getArticle().getId() == book.getId()) {
                    if(item.getCount() >= 127) {
                        items = getFreshItems();
                        FacesContext.getCurrentInstance().addMessage("count:count", new FacesMessage("Es können maximal 127 eines Artikels auf einmal gekauft werden."));
                        return "cart.jsf";
                    }
                    Database.getInstance().shoppingCart().delete(item);
                    item.setCount(item.getCount() + 1);
                    Database.getInstance().shoppingCart().insert(item);
                    items = getFreshItems();
                    return "cart.jsf";
                }
            }
            Database.getInstance().shoppingCart().insert(new ShoppingCartItem(getUser(), book, 1));
        }
        items = getFreshItems();
        return "cart.jsf";
    }

    public String remove(ShoppingCartItem item) {
        if (getUser() != null) {
            Database.getInstance().shoppingCart().delete(item);
            items = getFreshItems();
        }
        return "cart.jsf";
    }

    public List<ShoppingCartItem> getItems() {
        if(items == null)
            items = getFreshItems();
        return items;
    }

    private List<ShoppingCartItem> getFreshItems() {
        Database db = Database.getInstance();
        if (getUser() != null) {
            items = db.shoppingCart().get(getUser());
        } else {
            items = new ArrayList<>();
        }
        return items;
    }

    public void change(@NotNull ValueChangeEvent event) {
        if (event.getPhaseId() != PhaseId.INVOKE_APPLICATION) {
            event.setPhaseId(PhaseId.INVOKE_APPLICATION);
            event.queue();
            return;
        }

        for(ShoppingCartItem item : getItems()) {
            Database.getInstance().shoppingCart().updateItem(item);
        }
    }

    public String buy() {
        ArrayList<OrderItem> orderList = new ArrayList<>();
        for (ShoppingCartItem item : getFreshItems()) {
            orderList.add(new OrderItem(item.getArticle(), item.getCount()));
        }
        Database.getInstance().order().insert(new Order(getUser(), orderList, new Date(System.currentTimeMillis()), sum(), getPayment(), getAddress()));
        for (ShoppingCartItem item : getFreshItems()) {
            Database.getInstance().shoppingCart().delete(item);
        }
        items = getFreshItems();
        return "thanks.jsf";
    }

    public int getItemCount() {
        int count = 0;
        for(ShoppingCartItem item : getItems()) {
         count += item.getCount();
        }
        return count;
    }

    public long sum() {
        int sum = 0;
        for (ShoppingCartItem item : getItems()) {
            sum += item.getCount() * item.getArticle().getPrice();
        }
        return sum;
    }

    public String getSum() {
        long sum = sum();
        String res = "";
        res += sum / 100;
        res += ",";
        if (sum % 100 < 10) {
            res += "0";
        }
        res += sum % 100;
        return res;
    }

}