# -*- coding: utf-8 -*-
# !/usr/bin/env python

from __future__ import absolute_import, unicode_literals

import logging
import random
import string
import time

import requests

from library.wechatpy.client import api
from library.wechatpy.client.base import BaseWeChatClient
from library.wechatpy.utils import WeChatSigner
from library.wechatbase.exceptions import WeChatException, WechatNetworkException

logger = logging.getLogger(__name__)


class WeChatClient(BaseWeChatClient):
    """
    微信 API 操作类
    通过这个类可以操作微信 API，发送主动消息、群发消息和创建自定义菜单等。
    """

    API_BASE_URL = 'https://api.weixin.qq.com/cgi-bin/'

    card = api.WeChatCard()
    customservice = api.WeChatCustomService()
    datacube = api.WeChatDataCube()
    device = api.WeChatDevice()
    group = api.WeChatGroup()
    invoice = api.WeChatInvoice()
    material = api.WeChatMaterial()
    media = api.WeChatMedia()
    menu = api.WeChatMenu()
    merchant = api.WeChatMerchant()
    message = api.WeChatMessage()
    misc = api.WeChatMisc()
    poi = api.WeChatPoi()
    qrcode = api.WeChatQRCode()
    scan = api.WeChatScan()
    semantic = api.WeChatSemantic()
    shakearound = api.WeChatShakeAround()
    tag = api.WeChatTag()
    template = api.WeChatTemplate()
    subscribe = api.WeChatNewtmpl()
    user = api.WeChatUser()
    wifi = api.WeChatWiFi()
    wxa = api.WeChatWxa()
    marketing = api.WeChatMarketing()

    def __init__(self, appid, secret, session, timeout=None, auto_retry=True):
        super(WeChatClient, self).__init__(
            appid, session, timeout, auto_retry
        )
        self.appid = appid
        self.secret = secret

    @property
    def nonce_str(self):
        char = string.ascii_letters + string.digits
        return "".join(random.choice(char) for _ in range(32))

    def jsapi_sign(self, url):
        """
        生成签名给js使用
        """
        jsapi_ticket = self.jsapi_ticket
        timestamp = str(int(time.time()))
        nonce_str = self.nonce_str

        data = [
            'noncestr={noncestr}'.format(noncestr=nonce_str),
            'jsapi_ticket={jsapi_ticket}'.format(jsapi_ticket=jsapi_ticket),
            'timestamp={timestamp}'.format(timestamp=timestamp),
            'url={url}'.format(url=url),
        ]

        signer = WeChatSigner(delimiter=b'&')
        signer.add_data(*data)

        return {
            'sign': signer.signature,
            'timestamp': timestamp,
            'noncestr': nonce_str,
            'appId': self.appid,
            'jsapi_ticket': jsapi_ticket
        }

    def refresh_jsapi_ticket(self):
        """
        获取微信 JS-SDK ticket

        :return: 返回的 JSON 数据包
        """
        jsapi_ticket_response = self.get(
            'ticket/getticket',
            params={'type': 'jsapi'}
        )

        ticket = jsapi_ticket_response['ticket']

        expires_in = int(jsapi_ticket_response['expires_in'])
        if expires_in < 600:
            expires_in = expires_in / 2
        else:
            expires_in = expires_in - 600

        self.session.set(self.jsapi_ticket_key, ticket, expires_in)

        return ticket

    def refresh_access_token(self):
        logger.info('Fetching access token for {}'.format(self.appid))

        with requests.sessions.Session() as _session:
            res = _session.get(
                url='https://api.weixin.qq.com/cgi-bin/token',
                params={
                    'grant_type': 'client_credential',
                    'appid': self.appid,
                    'secret': self.secret
                },
                timeout=self.timeout)

            try:
                res.raise_for_status()
            except requests.RequestException as reqe:
                raise WechatNetworkException(
                    errCode='HTTP{}'.format(res.status_code),
                    errMsg=reqe.message,
                    client=self,
                    request=reqe.request,
                    response=reqe.response
                )

            result = res.json()

            if 'errcode' in result and result['errcode'] != 0:
                raise WeChatException(
                    errCode=result['errcode'],
                    errMsg=result['errmsg'],
                    client=self,
                    request=res.request,
                    response=res
                )

            expires_in = 7200 - 600
            if 'expires_in' in result:
                expires_in = result['expires_in']
                if expires_in < 600:
                    expires_in = expires_in / 2
                else:
                    expires_in = expires_in - 600

            self.session.set(
                self.access_token_key,
                result['access_token'],
                expires_in
            )

            return result['access_token']


class WeChatComponentClient(WeChatClient):
    """
    开放平台代公众号调用客户端
    """

    def __init__(self, appid, component, session=None, timeout=None):
        # 未用到secret，所以这里没有
        super(WeChatComponentClient, self).__init__(appid, "", session, timeout)
        self.appid = appid
        self.component = component

    def refresh_access_token(self):
        """
        获取 access token
        详情请参考 https://open.weixin.qq.com/cgi-bin/showdocument?action=dir_list\
        &t=resource/res_list&verify=1&id=open1419318587&token=&lang=zh_CN
        :return: 返回的 JSON 数据包
        """

        result = self.component.refresh_authorizer_token(self.appid)

        expires_in = 7200 - 600
        if 'expires_in' in result:
            expires_in = result['expires_in']
            if expires_in < 600:
                expires_in = expires_in / 2
            else:
                expires_in = expires_in - 600

        self.session.set(
            self.access_token_key,
            result['authorizer_access_token'],
            expires_in
        )

        return result['authorizer_access_token']