from __future__ import print_function
import time
import Pyro4
from shoppingcart import ShoppingCart

class Shop(object):
    inventory= {
        "paper"     : 1.25,
        "bread"     : 1.50,
        "meat"      : 5.99,
        "milk"      : 0.80,
        "fruit"     : 2.65,
        "chocolate" : 3.99,
        "pasta"     : 0.50,
        "sauce"     : 1.20,
        "vegetables": 1.40,
        "cookies"   : 1.99,
        "pizza"     : 3.60,
        "shampoo"   : 2.22,
        "whiskey"   : 24.99
        }

    customersInStore={}

    def enter(self, name):
        print("Customer %s enters the store." % name)
        print("Customer takes a shopping cart.")
        # create a cart and return it as a pyro object to the client
        cart=ShoppingCart()
        self.customersInStore[name]=cart
        self._pyroDaemon.register(cart)   # make cart a pyro object
        return cart
    def customers(self):
        return list(self.customersInStore.keys())
    def goods(self):
        return self.inventory
    def payByName(self, name):
        print("Customer %s goes to the counter to pay." % name)
        cart=self.customersInStore[name]
        return self.payCart(cart, name)
    def payCart(self,cart,name=None):
        receipt=[]
        if name:
            receipt.append("Receipt for %s." % name)
        receipt.append("Receipt Date: "+time.asctime())
        total=0.0
        for item in cart.getContents():
            price=self.inventory[item]
            total+=price
            receipt.append("%13s  %.2f" % (item,price))
        receipt.append("")
        receipt.append("%13s  %.2f" % ("total:",total))
        cart.empty()
        return "\n".join(receipt)
    def leave(self, name):
        print("Customer %s leaves." % name)
        cart=self.customersInStore[name]
        print("  their shopping cart contains: %s" % cart.getContents())
        if cart.getContents():
            print("  it is not empty, they are trying to shoplift!")
            raise Exception("attempt to steal a full cart prevented")
        # delete the cart and unregister it with pyro
        del self.customersInStore[name]
        self._pyroDaemon.unregister(cart)


######## main program

daemon=Pyro4.Daemon()
shop=Shop()
uri=daemon.register(shop)
ns=Pyro4.locateNS()
ns.register("example.shop", uri)
print("Shop Server is ready.")
daemon.requestLoop()