python菜鸟学习： 7. 购物车升级版，用户、商品信息存储，修改，新增

# -*- coding: utf-8 -*-
import os

'''
用户入口：
1. 商品信息存在文件里
2. 已购商品，余额记录

商家入口
1. 可以添加商品，修改商品价格
商品信息：
commdList.txt
华为手机,8888
iphon, 2222
bike, 8888

用户信息：
userinfo.txt
LiYuZhoupan,100000
ZhangSan,8888
liSi,10000

'''

# 读取商品信息,用户信息
def readCommod(filename):
    commadList = {}
    with open(filename, "r", encoding="utf-8") as f:
        for i in f.readlines():
            # 商品名称
            name = i.split(",")[0]
            info = i.split(",")[1].replace("\n", " ")
            commadList[name] = info
    f.close()
    return commadList

# 追加商品信息,用户信息
def writeCommand(name, info, filename):
    name = name
    info = info
    if str(info).isdigit():
        with open(filename, 'a', encoding="utf-8") as f:
            f.write(name + "," + str(info) + "\n")
    else:
        print("输入错误请重新输入！")
    f.close()

# 修改商品信息
def changeCommand(name, info, filename):
    name = name
    info = info
    if str(info).isdigit():
        # 遍历原来的文件夹
        with open(filename, 'r', encoding="utf-8") as f:
            # 创建新的文件夹
            with open(filename + "tmp", "a", encoding="utf-8") as f1:
                # 将原来的文件内容添加到新的文件
                for i in f.readlines():
                    # 如果传入的name存在原来文件中，则修改传入的info信息
                    if name == i.split(",")[0]:
                        f1.write(name + "," + str(info) + "\n")
                    else:
                        f1.write(i)
            f1.close()
        f.close()
        os.remove(filename)
        os.rename(filename + "tmp", filename)

# 购物车得到用户信息
def shoppingGetusreInfo():
    # 输入用户名
    username = input("请输入用户名:\n")
    useSalary = 0
    # 查找用户信息表中是否存在该用户，如果不存在则添加
    userList = readCommod("userinfo.txt")
    if username in userList:
        print("您当前的余额为：{salary}".format(salary=userList[username]))
        useSalary = userList[username]
    else:
        salary = input("your salary:\n")
        if salary.isdigit():
            writeCommand(username, salary, "userinfo.txt")
            useSalary = salary
            print("用户-->{_username}<--添加成功,余额为-->{_salary}<--".format(_username=username, _salary=useSalary))
        else:
            print("请输入整数")
    changeCommand(username, useSalary, "userinfo.txt")
    print("用户-->{_username}<--,余额为-->{_salary}<--".format(_username=username, _salary=useSalary))
    return username, int(useSalary)

# 购物车挑选商品：
def shoppingGetCommand():
    # 设置标签
    flag = True
    # 定义所选购物品
    yourCommandList = []
    username, money = shoppingGetusreInfo()
    print("商品信息如下：".center(50, "#"))
    # 将商品信息写入到字典中
    commandDict = readCommod("commdList.txt")
    # 将字段中的商品名称以数组存储
    commandList = list(commandDict.keys())
    for i in range(len(commandList)):
        print(str(i) + "," + commandList[i] + "," + commandDict.get(commandList[i]))
    print("请选择你需要的商品：".center(50, "*"))
    while flag:
        commandNum = input("商品编号,退出请按Q:\n")
        if commandNum.isdigit() and int(commandNum) < len(commandList):
            # 如果余额足够则添加商品，并扣除余额
            if money > int(commandDict.get(commandList[int(commandNum)])):
                yourCommandList.append(commandList[int(commandNum)])
                money = money - int(commandDict.get(commandList[int(commandNum)]))
                print("您选择的物品有{yourCommandList}，余额为：{money}".format(yourCommandList=yourCommandList, money=money))
            else:
                print("您余额{money}，不足够支付：{money1}".format(money=money,
                                                         money1=int(commandDict.get(commandList[int(commandNum)]))))
        elif commandNum == "Q":
            flag = False
        else:
            print("输入错误，请重新输入！")
    # 打印最终购买的物品
    print("您选择的物品有{yourCommandList}，余额为：{money}".format(yourCommandList=yourCommandList, money=money))
    # 回填余额信息
    changeCommand(username, money, "userinfo.txt")

if __name__ == '__main__':
    flag = input("请输入1/2,其他退出：【1,商家；2，顾客】：\n")
    if flag.isdigit():
        # 商家操作
        if int(flag) == 1:
            # 修改商品信息
            # 将商品信息写入到字典中
            commandDict = readCommod("commdList.txt")
            # 将字段中的商品名称以数组存储
            commandList = list(commandDict.keys())
            for i in range(len(commandList)):
                print(str(i) + "," + commandList[i] + "," + commandDict.get(commandList[i]))
            name = input("请输入需要修改的商品名称：\n")
            price = input("请输入需要修改的商品价格：\n")
            # 如果存在商品字典中则修改商品价格
            if name in commandDict:
                changeCommand(name, price, "commdList.txt")
            # 如果不存在商品字段中则增加商品信息
            else:
                writeCommand(name, price, "commdList.txt")
        # 顾客操作
        elif int(flag) == 2:
            shoppingGetCommand()
    else:
        print("输入错误或者退出{flag}".format(flag=flag))
        exit()

# writeCommand("liyuzhoupan123", "100000", "userinfo.txt")
# print(readCommod("userinfo.txt"))
# changeCommand("liyuzhoupan", "7777", "userinfo.txt")
# shoppingGetCommand()