import re
import random
import time

from common.rsa import decrypt_data
from user.user_db import FIND_USER_INFO, FIND_VERIFY_CODE


def make_id(num):
    """
    随机生成字符串
    """
    choices = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'
    salt = ''
    for i in range(num):
        salt += random.choice(choices)
    return salt


def check_mail_fmt(email):
    """
    邮箱地址格式校验
    Parameters:
        email: 邮箱
    Returns:
        result: 邮箱校验结果，正确返回True，不正确返回False
    """
    regex = "^.+\\@(\\[?)[a-zA-Z0-9\\-\\.]+\\.([a-zA-Z]{2,3}|[0-9]{1,3})(\\]?)$"
    case = (len(email) > 7) and (re.match(regex, email) is not None)
    result = True if case else False
    return result


def check_pwd_fmt(pwd):
    """
    密码强度校验
    Parameters:
        pwd: 密码（已加密）
    Returns:
        result: 密码强度校验结果，正确返回True，不正确返回False
    """

    try:
        password = decrypt_data(encrypt_msg=pwd)
    except Exception:
        return False

    regex = "^(?![A-Za-z0-9]+$)(?![a-z0-9\\W]+$)(?![A-Za-z\\W]+$)(?![A-Z0-9\\W]+$)^.{8,}$"
    case = (len(password) >= 8) and (re.match(regex, password) is not None)
    result = True if case else False
    return result


def check_registered(email):
    """
    检查邮箱是否被注册
    Parameters:
        email: 邮箱
    Returns:
        邮箱未被注册 False
        邮箱已被注册 True
    """
    return False if FIND_USER_INFO({"邮箱": email}) == [] else True


def check_verify_code(email, code):
    """
    验证码是否正确
    Parameters:
        email: 邮箱
        code: 验证码
    Returns:
        没有邮箱记录 False
        验证码不正确 False
        验证码过期 False
        验证码正确 True
    """
    record = FIND_VERIFY_CODE({"邮箱": email})
    if len(record) == 0:
        return '验证码错误'
    if record[0]['验证码'] != code:
        return '验证码错误'
    if time.time()-record[0]['验证有效期'] > 300:
        return '验证码过期'
    return True