#!/usr/bin/python

#Author : Satishkumar masilamani, University of texas @Arlington

#Date : 25-Feb-2014

#Description : This program was written for Zappos Software Engineering Colleger Intern Position

# In order to facilitate better gift-giving on the Zappos website, the Software Engineering team

# would like to test a simple application that allows a user to submit two inputs: N (desired # of products)

# and X (desired dollar amount). The application should take both inputs and leverage the

# Zappos API (http://developer.zappos.com/docs/api-documentation) to create a list of Zappos products

# whose combined values match as closely as possible to X dollars.

from urllib import urlopen

from json import loads as jsonloads

DesiredDollarAmount = 0 #Stores the total amount planned to spend

DesiredNoOfProducts = 0 #Stores the total number of products planned to buy

PriceOfEachProduct = [0] #Stores the price of each product to use while searching

SplitAmountEqually = "" #Indicates whether the price has to be equally distributed

Remainder = 0 #If the money is equally distributen then we need to add the remainder to one of the product

Amount = 0 #Stores the amount of each product to be assigned too

LoopRun = True #indicates when the loop has to be terminated

PartialAmount = 0 #strores the amount the user inputs for each product

PartialTotalAmount = 0 #stores the sum of the amount the user inputs

Count =0 #Counter to check the number of times the loop was run

MinimumMoneyForOtherProducts = 0 #Assumed to spare atleast 10$ for the remaing products each

#ReturnedItems = [] #Stores the list of items

SelectedItemsAttribute = [] #Stores the product ID of each product that has been selected

FinalItemsSelected = [] #Stores all the details of the products that has been selected

TotalEstimatedCost = 0.00 #Stores the total cost of the products that is selected through this app

ApiKey = "&key=52ddafbe3ee659bad97fcce7c53592916a6bfd73" #Stores the Api Key used to retrieve the data from zappos

#def SelectAnItem(SearchingProductPrice,SelectedItemsAttribute):

#This function returns of the items which fits for the price range provided

#the result is already sorted based on the product popularity

#We limit the result to 10 products, by default it returns only 10 products but

#still the value has been provided to make sure the same

def SelectAnItem(SearchingProductPrice):

PriceOfEachProduct[Count+1] += 1

print " We will suggest you with the products in your range. "

print " Please Enter the Amount(Integer) that you would like to spend on shopping and the number of gifts you are looking to buy"

while True:

#get the user desire input

DesiredDollarAmount = input("\nPlease enter the amount you would like to spend : ")

DesiredNoOfProducts = input("Please enter the number of items you want to purchase : ")

#check if the inputs are valid, if yes then exit the while loop

if (DesiredDollarAmount > 0 and DesiredNoOfProducts >0 and DesiredNoOfProducts < 10):

break

else: #if the values are not valid check for the appropriate error message

#since the limit of retrieving data is for only 10 products, we have limited the number of products

#not to be more than 10.

if DesiredNoOfProducts >10:

print "\nThe number of products cannot be more than 10, please enter a value lesser than 10"

else:

print "\nPlease enter the Amount and Products greater than zero"

#if the user wish to split the amount equally with all the products or not

SplitAmountEqually = raw_input("Do you want to split the Amount equally into all the gifts (Y/N) : ")

#if user wants to distribute equally

if (SplitAmountEqually == "Y"):

#run the for loop based on the number of products to be selected.

for x in xrange(DesiredNoOfProducts):

#for the first product add the remainder of the modulo

if (x == 0):

Remainder = (DesiredDollarAmount % DesiredNoOfProducts)

Amount = ((DesiredDollarAmount - Remainder) / DesiredNoOfProducts) + Remainder

#for other products just assign the value.

else:

Amount = ((DesiredDollarAmount - Remainder) / DesiredNoOfProducts)

PriceOfEachProduct.append(Amount)

#if the user wish to assign different values for different products then ask the user.

else:

#run the for loop based on the number of products

for x in xrange(DesiredNoOfProducts):

#variable used to check if the value entered by the user is valid

LoopRun = True

#calculate the minimum amount required for other products and minus this with the total value

MinimumMoneyForOtherProducts = ((DesiredNoOfProducts-x-1) * 10)

while LoopRun:

PartialAmount = input("\nPlease enter the Amount to be spent on product " + `(x+1)` + ' : ')

PartialTotalAmount = sum(PriceOfEachProduct)

#if the amount entered by the user is more than the amount that could be allocated then throw a message and asg again for the user input

if (((PartialAmount + PartialTotalAmount) > (DesiredDollarAmount - MinimumMoneyForOtherProducts)) or (PartialAmount <=0)):

print "Please enter the amount greater than zero and lesser than or equal to " + `(DesiredDollarAmount - sum(PriceOfEachProduct) - MinimumMoneyForOtherProducts)`

else:

LoopRun = False

PriceOfEachProduct.append(PartialAmount)

while True:

Count+=1

#call to select the item based on the current product price

SelectAnItem(PriceOfEachProduct[Count])

#if the number of products to be selected equals the count then break the loop

if (Count == DesiredNoOfProducts) :

break

#print FinalItemsSelected

Count = 1

#print the details of the products that was selected.

for item in FinalItemsSelected:

print `Count` + ". Product Name : " + item['brandName'] + "(ID : " + item['productId'] + ")"

print " Product URL : " + item['productUrl']

print " Brand Name : " + item['brandName']

print " Price : " + item['price'] + " Original Price : " + item['originalPrice']

print " Discount : " + item['percentOff']

#strip only the price for the item[price] value, this will be in the format $99.99

price = item['price'][1:]

#calculate the total estimate

TotalEstimatedCost += float(price)

Count+=1

print "Total Estimated cost is : $" +`TotalEstimatedCost`

print "Budget : $" + `DesiredDollarAmount` + " Total Number of products : " + `DesiredNoOfProducts`