import functools

from flask import request
from itsdangerous import TimedJSONWebSignatureSerializer as Serializer, SignatureExpired, BadSignature

from common.db import find_data

TOKEN_KEY = "P0eHym@&CbaLzWkq"


def api_secret(func):
    """
    校验接口请求密钥
    """
    secret = "EZgo9ykxrYuBMYnYmmKIh"  # 接口密钥

    @functools.wraps(func)
    def internal(*args, **kwargs):
        try:
            token = request.headers.get('secret')
            if token != secret:
                return {"info": "接口密钥错误"}, 401
        except Exception:
            return {"info": "请求异常"}, 401
        return func(*args, **kwargs)
    return internal


def api_verification_code(func):
    """
    检查验证码
    """
    v_client = "tfse_admin"  # 校验数据库服务
    v_database = "用户"  # 校验数据库名称
    v_collection = "验证记录"  # 校验数据表名称

    @functools.wraps(func)
    def internal(*args, **kwargs):

        try:
            email = request.json['email']
            vcode = request.json['vcode']
            res = find_data(v_client, v_database, v_collection, {"email": email})

            if len(res) == 0:
                return {"info": "验证码错误"}, 401

            if res[0]['vcode'] == vcode:
                pass
            else:
                return {"info": "验证码错误"}, 401

        except Exception:
            return {"info": "请求异常"}, 401

        return func(*args, **kwargs)
    return internal


def verify_token(func):
    """
    校验token
    Returns:
        返回token被解析后的值
    """
    @functools.wraps(func)
    def internal(*args, **kwargs):
        try:
            s = Serializer(TOKEN_KEY)
            token = s.loads(request.headers.get('token'))
        except TypeError:
            return {"info": "参数错误"}, 401
        except KeyError:
            return {"info": "参数错误"}, 401
        except BadSignature:
            return {"info": "token错误"}, 401
        except SignatureExpired:
            return {"info": "token过期"}, 401
        return func(*args, **kwargs, token=token)
    return internal


def create_token(param):
    """
    创建token
    Parameters:
        param: 传入参数，用于创建token
    Returns:
        token: 用户访问令牌
    """
    token_expiration = 14400

    s = Serializer(TOKEN_KEY, expires_in=token_expiration)
    token = '' + s.dumps(param).decode('ascii')
    return token