import datetime
import time
from random import Random
import base64
import pytz
import requests
import OpenSSL.crypto as ct
from base64 import encodebytes
from azoauth.config import ALEXA_EVENT_API, CLIENT_CONFIG, LOGGER
from model.models import iotdeviceInfoModel, UidRtspModel, AlexaAuthModel


# 复用性且公用较高封装代码在这
class CommonService:
    # 生成随机数
    @staticmethod
    def encrypt_data(randomlength=8, number=False):
        str = ''
        if number == False:
            characterSet = 'AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsT' \
                           'tUuVvWwXxYyZz0123456789'
        else:
            characterSet = '0123456789'

        length = len(characterSet) - 1

        random = Random()
        for index in range(randomlength):
            str += characterSet[random.randint(0, length)]
        return str

    # 加密
    # @staticmethod
    def encrypt_pwd(self, userPwd):
        for i in range(1, 4):
            if i == 1:
                userPwd = self.RandomStr(3, False)+userPwd+self.RandomStr(3, False)
                userPwd = base64.b64encode(str(userPwd).encode("utf-8")).decode('utf8')
            if i == 2:
                userPwd = self.RandomStr(2, False)+str(userPwd)+self.RandomStr(2, False)
                userPwd = base64.b64encode(str(userPwd).encode("utf-8")).decode('utf8')
            if i == 3:
                userPwd = self.RandomStr(1, False)+str(userPwd)+self.RandomStr(1, False)
                userPwd = base64.b64encode(str(userPwd).encode("utf-8")).decode('utf8')
        return userPwd

    # 解密
    @staticmethod
    def decode_pwd(password):
        for i in range(1, 4):
            if i == 1:
                # 第一次先解密
                password = base64.b64decode(password)
                password = password.decode('utf-8')
                # 截去第一位，最后一位
                password = password[1:-1]
            if i == 2:
                # 第2次先解密
                password = base64.b64decode(password)
                password = password.decode('utf-8')
                # 去前2位，后2位
                password = password[2:-2]
            if i == 3:
                # 第3次先解密
                password = base64.b64decode(password)
                password = password.decode('utf-8')
                # 去前3位，后3位
                password = password[3:-3]
        return password

    # 生成随机字符串
    @staticmethod
    def RandomStr(randomlength=8, number=False):
        str = ''
        if number == False:
            characterSet = 'AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsT' \
                           'tUuVvWwXxYyZz0123456789'
        else:
            characterSet = '0123456789'

        length = len(characterSet) - 1

        random = Random()
        for index in range(randomlength):
            str += characterSet[random.randint(0, length)]

        return str

    @staticmethod
    def query_serial_with_uid(uid):
        # 根据uid查询序列号,存在则返回序列号,否则返uid
        uid_qs = UidRtspModel.objects.filter(uid=uid).values('serial_number')
        if uid_qs.exists():
            serial_number = uid_qs[0]['serial_number']
            if serial_number:
                return serial_number
        return uid

    @staticmethod
    def req_publish_mqtt_msg(identification_code, topic_name, msg, qos=1):
        """
        通用发布MQTT消息函数
        @param identification_code: 标识码
        @param topic_name: 主题名
        @param msg: 消息内容
        @param qos: mqtt qos等级
        @return: boolean
        """
        if not all([identification_code, topic_name]):
            return False

        if identification_code.endswith('11L'):
            thing_name = 'LC_' + identification_code
        else:
            thing_name = 'Ansjer_Device_' + identification_code

        try:
            # 获取数据组织将要请求的url
            iot = iotdeviceInfoModel.objects.filter(
                thing_name=thing_name).values(
                'endpoint', 'token_iot_number')
            if not iot.exists():
                return False
            endpoint = iot[0]['endpoint']
            Token = iot[0]['token_iot_number']

            # api doc: https://docs.aws.amazon.com/zh_cn/iot/latest/developerguide/http.html
            # url: https://IoT_data_endpoint/topics/url_encoded_topic_name?qos=1
            # post请求url发布MQTT消息
            url = 'https://{}/topics/{}?qos={}'.format(endpoint, topic_name, qos)
            authorizer_name = 'Ansjer_Iot_Auth'
            signature = CommonService.rsa_sign(Token)  # Token签名
            headers = {
                'x-amz-customauthorizer-name': authorizer_name,
                'Token': Token,
                'x-amz-customauthorizer-signature': signature}
            r = requests.post(url=url, headers=headers, json=msg, timeout=2)
            if r.status_code == 200:
                res = r.json()
                if res['message'] == 'OK':
                    return True
                return False
            else:
                return False
        except Exception as e:
            return False

    @staticmethod
    def rsa_sign(Token):
        # 私钥签名Token
        if not Token:
            return ''
        private_key_file = '''-----BEGIN RSA PRIVATE KEY-----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-----END RSA PRIVATE KEY-----'''
        # 使用密钥文件方式
        # private_key_file_path = os.path.join(BASE_DIR, 'static/iotCore/private.pem')#.replace('\\', '/')
        # private_key_file = open(private_key_file_path, 'r')
        private_key = ct.load_privatekey(ct.FILETYPE_PEM, private_key_file)
        signature = ct.sign(private_key, Token.encode('utf8'), 'sha256')
        signature = encodebytes(signature).decode('utf8').replace('\n', '')
        # print('signature:', signature)
        return signature

    @staticmethod
    def timestamp_to_iso8601(timestamp):
        # 将十位时间戳（秒）转换为UTC时区的datetime对象
        utc_dt = datetime.datetime.fromtimestamp(timestamp, pytz.UTC)
        # 格式化为YYYY-MM-DDThh:mm:ssZ格式
        return utc_dt.strftime("%Y-%m-%dT%H:%M:%SZ")

    @classmethod
    def get_access_token(cls, user_id):
        auth_qs = AlexaAuthModel.objects.filter(userID=user_id).values(
            'expiresTime', 'refresh_token', 'access_token', 'alexa_region', 'skill_name')
        if not auth_qs.exists():
            return False

        expires_time = auth_qs[0]['expiresTime']
        alexa_region = auth_qs[0]['alexa_region']

        now_time = int(time.time())
        if now_time < expires_time:
            access_token = auth_qs[0]['access_token']
        else:
            if alexa_region not in ALEXA_EVENT_API.keys():
                return False

            skill_name = auth_qs[0]['skill_name']
            refresh_token = auth_qs[0]['refresh_token']
            res = cls.get_refresh_token(refresh_token, skill_name)
            if 'error' not in res:
                auth_qs.update(
                    access_token=res['access_token'],
                    refresh_token=res['refresh_token'],
                    expiresTime=now_time + 3000,
                    updTime=now_time,
                )
                access_token = res['access_token']
            else:
                return False
        return access_token

    @staticmethod
    def get_refresh_token(refresh_token, skill_name):
        # 请求更新token
        if skill_name not in CLIENT_CONFIG.keys():
            return {'error': 'error skill_name'}

        payload = {
            'grant_type': 'refresh_token',
            'refresh_token': refresh_token,
            'client_id': CLIENT_CONFIG[skill_name]['client_id'],
            'client_secret': CLIENT_CONFIG[skill_name]['client_secret'],
        }
        auth_request_url = 'https://api.amazon.com/auth/o2/token'
        headers = {
            'content-type': "application/x-www-form-urlencoded",
            'cache-control': "no-cache"
        }
        try:
            res = requests.post(auth_request_url, data=payload, headers=headers, timeout=5)
            res.raise_for_status()
            request_json = res.json()
            return request_json
        except requests.exceptions.RequestException as e:
            return {'error': str(e)}