import json
import os
import time
import random

import requests
from werkzeug.security import generate_password_hash, check_password_hash

from user.user_db import INSERT_DATA, FIND_DATA, UPSERT_DATA, DELETE_DATA
from user.user_utils import check_mail_fmt, check_pwd_fmt, create_token, decrypt_data


def create_user_impl(email, name, pwd, role):
    """
    创建新用户流程
    Parameters:
        email str 邮箱
        name str 姓名
        pwd str 密码
        role str 角色
    Returns:
        执行成功 bool True
        执行失败 str 异常信息
    """
    def check_params():
        """
        参数检查
        """
        roles = ['admin', 'developer', 'analysts', 'manager', 'guest']
        if role not in roles:
            return "用户角色异常"

        if not check_mail_fmt(email):
            return "邮箱格式错误"

        if not check_pwd_fmt(pwd):
            return "密码格式错误"

        if len(FIND_DATA("用户", "用户信息", {"email": email})) > 0:
            return "邮箱已被注册"

        return True

    def gen_new_uid():
        """
        生成新的用户ID，如果该ID存在，则重新生成
        Returns:
            生成的用户ID
        """

        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 gen_id():
            """
            生成新ID，
            检查新ID是否存在，如果存在则继续生成新ID
            若新ID可使用，返回新ID
            """
            new_id = make_id(8)
            case = FIND_DATA("用户", "用户信息", {"企业ID": new_id}) is []
            while case:
                new_id = make_id(8)
            return new_id

        return gen_id()

    def start_impl():
        """
        执行流程
        """
        check_param_result = check_params()
        if check_param_result is not True:
            return check_param_result

        user = dict()
        user['UID'] = gen_new_uid()
        user['email'] = email
        user['name'] = name
        user['pwd'] = generate_password_hash(decrypt_data(encrypt_msg=pwd))
        user['status'] = 'normal'
        user['role'] = role
        user['create_time'] = time.strftime("%Y-%m-%d %H:%M:%S", time.localtime())

        INSERT_DATA("用户", "用户信息", user)

        return True

    return start_impl()


def login_impl(email, pwd, vcode):
    user_info = FIND_DATA('用户', '用户信息', {"email": email})

    def check_email():
        if user_info is []:
            return "不存在该邮箱"
        if not check_mail_fmt(email):
            return "邮箱格式错误"
        return True

    def check_vcode():
        records = FIND_DATA("用户", "验证记录", {"email": email})

        if len(records) == 0:
            return "无验证信息"

        if records[0]['vcode'] != vcode:
            return "验证码错误"

        if time.time() - records[0]['timestamp'] > 300:
            return "验证码过期"

        DELETE_DATA("用户", "验证记录", {"email": email})

        return True

    def check_pwd():
        hash_pwd = user_info[0]['pwd']
        try:
            if not check_password_hash(hash_pwd, decrypt_data(encrypt_msg=pwd)):
                return "密码错误"
        except Exception:
            return "密码错误"
        return True

    def make_menus():
        role = user_info[0]['role']
        duty = user_info[0]['duty']

        with open(os.path.abspath(os.path.dirname(__file__)+'/static/menus.json'), "r", encoding='utf-8') as f:
            duties = json.load(f)

        if role == 'member':
            return duties[role][duty]
        else:
            return duties[role]

    def make_session_id():
        choices = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789'
        session_id = ''
        for i in range(4):
            session_id += random.choice(choices)
        UPSERT_DATA("用户", "token记录", {"UID": user_info[0]['UID']}, {"session_id": session_id})
        return session_id

    def make_result_data():
        res_data = dict()
        res_data['token'] = create_token(make_session_id())
        res_data['menus'] = make_menus()
        return res_data

    def start_impl():
        result = check_email()
        if result is not True:
            return result

        result = check_pwd()
        if result is not True:
            return result

        result = check_vcode()
        if result is not True:
            return result

        return make_result_data()

    return start_impl()


def send_vcode_to_user_impl(email):

    def check_param():
        if not check_mail_fmt(email):
            return "邮箱格式错误"
        return True

    def gen_vcode():
        choices = '0123456789'
        salt = ''
        for i in range(6):
            salt += random.choice(choices)
        return salt

    def send_email():
        email_api = 'http://116.63.130.34:30001'
        vcode = gen_vcode()
        timestamp = round(time.time())
        headers = {"Content-Type": "application/json;charset=UTF-8"}
        data = {"title": "【远东资信】{}".format("登录验证码"),
                "sender": 'fecribd@fecr.com.cn',
                "recipients": [email],
                "msg_body": "您{}的验证码为 【{}】，5分钟内有效。".format("登录", vcode)}
        requests.post(url=email_api + '/send_mail', headers=headers, data=json.dumps(data))
        UPSERT_DATA('用户', '验证记录', {"email": email}, {"vcode": vcode, "timestamp": timestamp})
        return True

    def start_impl():
        res = check_param()
        if res is not True:
            return res

        res = send_email()
        if res is not True:
            return res

        return True

    return start_impl()


def list_user_impl():
    """
    用户信息列表
    """
    # TODO


def disable_user_impl():
    """
    禁用用户
    """
    # TODO


def delete_user_impl():
    """
    删除用户
    """
    # TODO


def manage_role_of_user_impl():
    """
    管理用户角色
    """
    # TODO