#!/usr/bin/env python 
# -- coding: utf-8 -- 
import time, random, os, sys, json
import requests, datetime
from .settings import SECRETID, SECRETKEY, PROXYPOOL_UPDATENUM, PROXYPOOL_MIN_NUM, PROXYPOOL_MIN_DURATION


SECRET_PATH = './.secret'


def _get_secret_token():
    r = requests.post(url='https://auth.kdlapi.com/api/get_secret_token', data={'secret_id': SECRETID, 'secret_key': SECRETKEY})
    if r.status_code != 200:
        raise KdlException(r.status_code, r.content.decode('utf8'))
    res = json.loads(r.content.decode('utf8'))
    code, msg = res['code'], res['msg']
    if code != 0:
        raise KdlException(code, msg)
    secret_token = res['data']['secret_token']
    expire = str(res['data']['expire'])
    _time = '%.6f' % time.time()
    return secret_token, expire, _time


def _read_secret_token():
    with open(SECRET_PATH, 'r') as f:
        token_info = f.read()
    secret_token, expire, _time, last_secret_id = token_info.split('|')
    if float(_time) + float(expire) - 3 * 60 < time.time() or SECRETID != last_secret_id:  # 还有3分钟过期或SecretId变化时更新
        secret_token, expire, _time = _get_secret_token()
        with open(SECRET_PATH, 'w') as f:
            f.write(secret_token + '|' + expire + '|' + _time + '|' + SECRETID)
    return secret_token


def get_secret_token():
    if os.path.exists(SECRET_PATH):
        secret_token = _read_secret_token()
    else:
        secret_token, expire, _time = _get_secret_token()
        with open(SECRET_PATH, 'w') as f:
            f.write(secret_token + '|' + expire + '|' + _time + '|' + SECRETID)
    return secret_token


class KdlException(Exception):
    """异常类"""


    def __init__(self, code=None, message=None):
        self.code = code
        if sys.version_info[0] < 3 and isinstance(message, unicode):
            message = message.encode("utf8")
        self.message = message
        self._hint_message = "[KdlException] code: {} message: {}".format(self.code, self.message)


    @property
    def hint_message(self):
        return self._hint_message


    @hint_message.setter
    def hint_message(self, value):
        self._hint_message = value


    def __str__(self):
        if sys.version_info[0] < 3 and isinstance(self.hint_message, unicode):
            self.hint_message = self.hint_message.encode("utf8")
        return self.hint_message


class ProxyPool:

    def __init__(self):
        self.update_num = PROXYPOOL_UPDATENUM
        self.min_num = PROXYPOOL_MIN_NUM
        self.min_duration = PROXYPOOL_MIN_DURATION
        self.signature = get_secret_token()
        self.api_url = f'https://dps.kdlapi.com/api/getdps/?secret_id={SECRETID}&signature={self.signature}&num={self.update_num}&pt=1&format=json&sep=1'
        self.proxy_list = []


    def get_one(self):
        self.ensure_min_num()
        _proxy_list = []
        while not _proxy_list:
            last_got = datetime.datetime.now() - datetime.timedelta(seconds=self.min_duration)
            _proxy_list = [p for p in self.proxy_list if p['last_got_time'] < last_got]
        _proxy = random.choice(_proxy_list)
        _proxy['last_got_time'] = datetime.datetime.now()
        return _proxy['proxy']


    def remove(self, proxy:str):
        self.proxy_list = [p for p in self.proxy_list if p['proxy'] != proxy]
        self.ensure_min_num()


    def ensure_min_num(self):
        while len(self.proxy_list) < self.min_num:
            new_proxy_list = requests.get(self.api_url).json().get('data').get('proxy_list')
            _proxy_list = [{'proxy': p, 'last_got_time': datetime.datetime(2020, 10, 1, 12, 30, 30, 100000)} for p in new_proxy_list]
            self.proxy_list.extend(_proxy_list)


if __name__ == '__main__':
    proxypool = ProxyPool()
    print(proxypool.get_one())