# coding=utf-8
import hashlib
import inspect
import time
from collections import OrderedDict
from urlparse import urljoin

import typing
import requests
import logging
import simplejson as json
from simplejson import JSONDecodeError

from library.jdopen.client.api.base import BaseJdOpenAPI
from library.jdopen.constants import JdOpenResultCode
from library.jdopen.exceptions import JdOpenException


if typing.TYPE_CHECKING:
    from requests import Response


logger = logging.getLogger(__name__)


class JdOpenBaseClient(object):

    API_BASE_URL = ""

    def __new__(cls, *args, **kwargs):
        self = super(JdOpenBaseClient, cls).__new__(cls)
        apis = inspect.getmembers(self, lambda x: inspect.isclass(x) and issubclass(x, BaseJdOpenAPI))

        for apiName, apiClient in apis:
            setattr(self, apiName, apiClient(self))

        return self

    def __init__(self, accessKey, secretKey, timeout=None, auto_retry=True):
        self._accessKey = accessKey
        self._secretKey = secretKey
        self._timeout = timeout
        self._auto_retry = auto_retry

    @staticmethod
    def _decode_result(res):    # type:(Response) -> typing.Optional[dict, str]
        """
        解析request返回的结果
        """
        try:
            result = json.loads(res.content.decode('utf-8', 'ignore'), strict=False)
        except (TypeError, ValueError, JSONDecodeError):
            logger.debug(u'错误的解析结构', exc_info=True)
            return res
        return result

    def calc_token(self, timestamp, path=None, body=None):
        data = OrderedDict()
        data["secretKey"] = self._secretKey
        data["timestamp"] = timestamp

        if path:
            data["path"] = path

        if body is not None:
            if isinstance(body, dict):
                data["body"] = json.dumps(body, separators=(",", ":"))
            else:
                data["body"] = body

        s = '&'.join([u'{}={}'.format(k, v) for k, v in data.items()])
        s = s.encode('utf-8')
        token = hashlib.sha1(s).hexdigest().upper()
        return token

    def _request(self, method, path, **kwargs):
        # 修补url
        logger.info("[{} send request], method = {}, path = {}, data = {}".format(self.__class__.__name__, method, path, kwargs))
        urlBase = kwargs.pop("urlBase", self.API_BASE_URL)
        url = urljoin(urlBase, path)

        # 修补data数据
        if isinstance(kwargs.get("data", ""), dict):
            data = kwargs.pop("data")
            kwargs['data'] = json.dumps(data, separators=(',', ':'))

        # 修补请求头
        timestamp = kwargs.pop("timestamp", str(int(time.time())))
        headers = {
            "Content-Type": "application/json",
            "accessKey": self._accessKey,
            "timestamp": timestamp,
            "token": self.calc_token(timestamp, path, body=kwargs.get("data", None))
        }
        kwargs.setdefault("params", {})
        kwargs.setdefault("timeout", self._timeout)
        callback = kwargs.pop("callback", None)

        with requests.sessions.Session() as _session:
            res = _session.request(
                method=method,
                url=url,
                headers=headers,
                **kwargs
            )
            try:
                res.raise_for_status()
            except requests.RequestException as rre:
                logger.info("[{} send request] error! status code = {}, error = {}".format(self.__class__.__name__, res.status_code, rre))
                raise JdOpenException(
                    errCode='HTTP{}'.format(res.status_code),
                    errMsg=rre.message,
                    client=self,
                    request=rre.request,
                    response=rre.response
                )

        return self._handle_result(
            res, method, url, callback, **kwargs
        )

    def _handle_result(self, res, method, url, callback, **kwargs):
        """
        主要用户重试
        """
        result = self._decode_result(res)

        logger.info("[{} handle_result] result = {}".format(self.__class__.__name__, result))

        if "result" not in result:
            return result

        # 正常请求
        if result["result"] == JdOpenResultCode.SUCCESS:
            return callback(result) if callback else result

        # 异常请求
        error = result["error"]

        raise JdOpenException(
            errCode=error.get("errorCode", ''),
            errMsg=error.get("errorMsg", ''),
            client=self,
            request=res.request,
            response=res
        )

    def get(self, url, **kwargs):
        return self._request("get", url, **kwargs)

    def post(self, url, **kwargs):
        return self._request("post", url, **kwargs)