商城系統:包含使用者註冊/使用者登陸/商品瀏覽/我的購物車功能.

"""
import os
import json
from datetime import datetime

USER_STATUS = False
USER_COUNT = {}
SHOPPING_CAR = {}


def decorate(arg):

    def inner():
        if not USER_STATUS:
            print('請先登陸後再檢視!')
            return
        arg()
        return

    return inner


def register():
    while 1:
        username = input('註冊使用者名稱:')
        with open('8login.txt', 'r', encoding='utf-8') as f:
            register1 = True
            for line in f:
                if line.split('----')[0].strip() == username:
                    register1 = False
                    print('帳戶已存在!')
                    break
            if not register1:
                break
        pwd = input('密碼:')
        sj = datetime.now().strftime('%Y-%m-%d %H:%M:%S')
        msg = '----'.join([username, pwd, sj, '0'])
        with open('8login.txt', 'a', encoding='utf-8') as f:
            f.write(msg + '\n')
        print('註冊成功!')
        return


def login():
    while 1:
        username = input('使用者名稱:')
        with open('8login.txt', 'r', encoding='utf-8') as f:
            status = False
            for line in f:
                if line.split('----')[0] == username:
                    if line.split('----')[-1].strip() == '3':
                        print('帳戶已鎖定!')
                        return
                    status = True
                    break

            if not status:
                print('使用者不存在!')
                return
        pwd = input('密碼:')
        with open('8login.txt', 'r', encoding='utf-8') as f:
            for line in f:
                if line.split('----')[0] == username and line.split('----')[1] == pwd:
                    USER_COUNT[username] = 0
                    print('登陸成功')
                    global USER_STATUS
                    USER_STATUS = username
                    return
        if USER_COUNT.get(username) == None:
            USER_COUNT[username] = 0
        if USER_COUNT[username] < 3:
            USER_COUNT[username] += 1
            if not USER_COUNT[username] < 3:
                with open('8login.txt', 'r', encoding='utf-8') as f1, \
                        open('8login(改).txt', 'w', encoding='utf-8') as f2:
                    for line in f1:
                        if line.split('----')[0] == username:
                            new_line = line.replace('0', '3')
                            f2.write(new_line)
                        else:
                            f2.write(line)
                os.remove('8login.txt')
                os.rename('8login(改).txt', '8login.txt')
                print('輸入錯誤超過3次,鎖定賬號!')
                return
            print('登入失敗請重試!')


@decorate
def goods():
    f = open('8商品列表', 'r', encoding='utf-8')
    a = f.read()
    lst = a.split('\n')
    max_page, end = divmod(len(lst), 3)  # 最大頁,最後一頁條數(總條數,每頁條數)
    if end > 0:
        max_page += 1
    x, y, z = 0, 3, 1
    while 1:
        if y > len(lst):
            y = len(lst)
        for i in range(x, y):
            print(lst[i])
        print('當前第%s頁,共%s頁.' % (z, max_page))
        user = input('請輸入序號加入到購物車,Y/y進入下一頁,N/n退出:')
        if user.upper() == 'N':
            return '已退出'
        elif user.upper() == 'Y':
            x += 3
            y += 3
            z += 1
            if y == len(lst) + 3:
                x, y, z = 0, 3, 1
            continue
        elif user.isdigit():
            pand = False
            f = open('8商品列表', 'r', encoding='utf-8')
            for line in f:
                cut = line.split('|')
                if user == cut[0]:
                    pand = True
                    if SHOPPING_CAR.get(cut[1]) == None:
                        SHOPPING_CAR[cut[1]] = 0
                    break
            if not pand:
                print('輸入錯誤!')
                continue
            while 1:
                count = input('請選擇數量:')
                if not count.isdigit():
                    print('請輸入阿拉伯數字!')
                    continue
                SHOPPING_CAR[cut[1]] += int(count)
                date = datetime.now().strftime('%Y-%m-%d-%H-%M')
                global USER_STATUS
                dir_path = os.path.exists('shopping_car\\%s' % USER_STATUS)
                if not dir_path:
                    os.mkdir('shopping_car\\%s' % USER_STATUS)
                with open("shopping_car\\%s\\%s.txt" % (USER_STATUS, date), 'w', encoding='utf-8') as f:
                    up = json.dumps(SHOPPING_CAR, ensure_ascii=False)
                    f.write(up)
                    break

            print('已新增進購物車!')
            print(SHOPPING_CAR)

        else:
            print('輸入有誤!')


@decorate
def shopping_car():
    if not os.path.exists('shopping_car\\%s' % USER_STATUS):
        print('您的購物車是空的,快去購買吧!')
        return
    content = os.walk('shopping_car\\%s' % USER_STATUS)
    for a, b, c in content:
        for x in c:
            print(x)
            f = open('shopping_car\\%s\\%s' % (USER_STATUS, x), 'r', encoding='utf-8')
            for line in f:
                a = json.loads(line)
                for item in a:
                    f = open('8商品列表', 'r', encoding='utf-8')
                    ls = f.read().split('\n')
                    for lm in ls:
                        if lm.split('|')[1] == item:
                            price = lm.split('|')[2]
                    print('    %s|%s|%s個' % (item,price , a[item]))

    return


def main():
    '''
    主頁面
    :return:
    '''
    dic = {'1': register, '2': login, '3': goods, '4': shopping_car}
    while 1:
        print('''*****歡迎來到沙河商城!*****
1.註冊帳戶
2.登陸帳戶
3.瀏覽商品
4.檢視購物車''')
        a = input('請選擇(N/n退出):')
        if a.upper() == 'N':
            return
        if dic.get(a) == None:
            print('輸入有誤!')
            continue
        dic.get(a)()


main()
"""