#!/usr/bin/env python
# -*- coding: utf-8 -*-

"""
@author: 烽火
@license: Apache Licence
@file: shopping.py
@time: 6/16/17 10:05 AM
"""

goods = [
  ("IPhone", 5800),
  ("Watch", 2000),
  ("MacBook", 12000)]

goods_cart = []

mybudget = input("請輸入您的預(yù)算:")

# 不考慮是小數(shù)的情況
while not mybudget.isdigit():
  mybudget = input("輸入有誤,請重新輸入您的預(yù)算:")
mybudget = int(mybudget);

while True:
  print("商品列表".center(50, "-"))
  print("編號".center(8, " "), "名稱".ljust(30, " "), "價格".ljust(10, " "))
  for i in enumerate(goods):
    print(str(i[0]).center(10, " "), str(i[1][0]).ljust(31, " "), str(i[1][1]).ljust(10, " "))

  user_choose = input("請輸入您的選擇:")

  if user_choose.isdigit():
    user_choose = int(user_choose)
    if user_choose >= 0 and user_choose < len(goods):
      if (mybudget - goods[user_choose][1]) >= 0:
        goods_cart.append(goods[user_choose])
        mybudget -= goods[user_choose][1]
        print("預(yù)算還有%d" % mybudget)
      else:
        print("預(yù)算不夠啦~")
    else:
      print("不存在該商品~")

  elif user_choose == 'q':
    break

  else:
    print("您的輸入有誤~")

print("預(yù)算還剩%d了" %(mybudget))
print("購物車商品信息".center(50, "-"))

for i in enumerate(goods_cart):
    print(str(i[0]).center(10, " "), str(i[1][0]).ljust(31, " "), str(i[1][1]).ljust(10, " "))