import json
import time
import hashlib


class Library():
    def __init__(self):
        self.loginStats = 0
        self.loginUser = None
        self.password = None
        self.now = time.strftime('%F %X')

    def hashPass(self,password):
        t = hashlib.sha256(password.encode('utf-8'))
        return t.hexdigest()

    def write_json(self, name, dict):
        with open(name, 'w') as f:
            json.dump(dict, f, indent='\t', ensure_ascii=False)

    def read_json(self, name):
        with open(name, 'r') as f:
            data = json.load(f)
        return data

    def regUser(self, u):
        self.write_json('./data.json', u)
        self.write_json(f'./{self.loginUser}', {'regTime': self.now,'book':{}})

    def login(self):
        data = self.read_json('data.json')
        if self.loginUser in data['user']:
            if data['user'][self.loginUser] == self.hashPass(self.password):
                return True

    def borrowBook(self, bookName):
        data = self.read_json('data.json')
        my_data = self.read_json(self.loginUser)
        if bookName in data['book']:
            del data['book'][bookName]
            my_data['book'][bookName] = self.now
            self.write_json('data.json', data)
            self.write_json(self.loginUser, my_data)
            return True

    def backBook(self, bookName):
        my_data = self.read_json(self.loginUser)
        data = self.read_json('data.json')
        if bookName in my_data['book']:
            del my_data['book'][bookName]
            data['book'][bookName] = self.now
            self.write_json('data.json', data)
            self.write_json(self.loginUser, my_data)
            return True

    def pushBook(self, books):
        if books:
            s = {}.fromkeys(books, self.now)
            data = self.read_json('data.json')
            data['book'].update(s)
            self.write_json('data.json', data)

    def main(self):
        try:
            while True:
                num = input('''(1) 注册\n(2) 登录\n(3) 借书\n(4) 还书\n(5) 上架\n(6) 注销\n(0) 退出\n请输入编号：''')
                if num == '2':
                    if self.loginStats==1: print('用户已登录');continue
                    self.loginUser, self.password = input('请输入账号：'), input('请输入密码：')
                    s = self.login()
                    if not s:
                        print('密码错误')
                    else:
                        print('登录成功')
                        self.loginStats = 1
                elif num == '1':
                    if self.loginStats==1: print('用户已登录');continue
                    data = self.read_json('data.json')
                    self.loginUser, self.password, password = input('请输入账号：'), input('请输入密码：'), input('请在此输入密码：')
                    if self.loginUser in data['user']: print('用户已存在')
                    else: data['user'][self.loginUser] = self.hashPass(self.password);self.regUser(data);print('创建成功');self.loginStats = 1
                elif num == '3':
                    if self.loginStats==0: print('用户未登录');continue
                    print('书籍列表：')
                    for k,v in self.read_json('data.json')['book'].items():
                        print(f'名称:{k}',f'时间:{v}',sep='\t\t')
                    bn = input('请输入书籍名称:')
                    if self.borrowBook(bn): print('借书成功')
                    else: print('输入错误，请检查')
                elif num == '4':
                    if self.loginStats==0: print('用户未登录');continue
                    if not self.read_json(self.loginUser)['book']:
                        print('没有借阅任何书籍')
                        continue
                    print('我的书架：')
                    for k,v in self.read_json(self.loginUser)['book'].items():
                        print(f'名称:{k}',f'时间:{v}',sep='\t\t')
                    bn = input('请输入书籍名称:')
                    if self.backBook(bn): print('还书成功')
                    else: print('输入错误，请检查')
                elif num == '5':
                    if self.loginUser!='admin001': print('管理员用户请自行初始化');continue
                    data = self.read_json('data.json')
                    blist = input('请输入书籍名称(多本书，请使用“,”隔开 ):').split(',')
                    data['book'].update({}.fromkeys(blist,self.now))
                    self.write_json('data.json',data)
                    print('上架成功')
                elif num == '6':
                    if self.loginStats==0: print('用户未登录');continue
                    print(f'{self.loginUser}已注销');self.loginUser = None
                elif num == '0':break
                else: print('输入错误，请重新输入')
        except StopIteration as e:
            print(e)
        finally:
            print('欢迎下次光临')


if __name__ == '__main__':
    t = Library()
    t.main()
    # 管理员用户上架图书
    # t = Library()
    # t.loginUser = 'admin001'
    # t.main()