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

import json

import requests


class BankAPI(object):
    def _get(self, **kwargs):
        return self._request(
            method = 'get',
            **kwargs
        )

    def _decode_result(self, res):
        try:
            result = json.loads(res.content.decode('utf-8', 'ignore'), strict = False)
        except (TypeError, ValueError):
            return res

        return result

    def _handle_result(self, res):
        if not isinstance(res, dict):
            result = self._decode_result(res)
        else:
            result = res

        return result

    def _request(self, method, url, **kwargs):
        headers = {'Content-Type': 'application/json;charset=utf-8'}

        if isinstance(kwargs.get('data', ''), dict):
            body = json.dumps(kwargs['data'], ensure_ascii = False)
            body = body.encode('utf-8')
            kwargs['data'] = body

        kwargs['timeout'] = kwargs.get('timeout', 5)

        with requests.sessions.Session() as session:
            res = session.request(
                url = url,
                method = method,
                headers = headers,
                **kwargs
            )

            res.raise_for_status()

            return self._handle_result(res)

    def get_bank_card_info(self, card_no):
        url = 'https://ccdcapi.alipay.com/validateAndCacheCardInfo.json?_input_charset=utf-8&cardNo={}&cardBinCheck=true'.format(
            card_no)

        result = self._request('get', url, timeout = 5)

        # logger.debug(str(result))

        if result['stat'] != 'ok' or result['key'] != card_no:
            return None

        if result['validated']:
            return {
                'bankAbbrevCode': result['bank'],
                'cardType': result['cardType']
            }
        else:
            return None