import json

import httpx

from . import consts as c, utils, exceptions


class Client(object):

    def __init__(self, api_key, api_secret_key, passphrase, use_server_time=False, flag='1'):

        self.API_KEY = api_key
        self.API_SECRET_KEY = api_secret_key
        self.PASSPHRASE = passphrase
        self.use_server_time = use_server_time
        self.flag = flag
        self.client = httpx.Client(base_url='https://www.okex.com', http2=True)

    def _request(self, method, request_path, params):
        if method == c.GET:
            request_path = request_path + utils.parse_params_to_str(params)
        timestamp = utils.get_timestamp()
        if self.use_server_time:
            timestamp = self._get_timestamp()
        body = json.dumps(params) if method == c.POST else ""
        sign = utils.sign(utils.pre_hash(timestamp, method, request_path, str(body)), self.API_SECRET_KEY)
        header = utils.get_header(self.API_KEY, sign, timestamp, self.PASSPHRASE, self.flag)
        response = None
        if method == c.GET:
            response = self.client.get(request_path, headers=header)
        elif method == c.POST:
            response = self.client.post(request_path, data=body, headers=header)
        if not str(response.status_code).startswith('2'):
            raise exceptions.OkexAPIException(response)
        return response.json()

    def _request_without_params(self, method, request_path):
        return self._request(method, request_path, {})

    def _request_with_params(self, method, request_path, params):
        return self._request(method, request_path, params)

    def _get_timestamp(self):
        request_path = c.API_URL + c.SERVER_TIMESTAMP_URL
        response = self.client.get(request_path)
        if response.status_code == 200:
            return response.json()['ts']
        else:
            return ""