# -*- coding: utf-8 -*-
# _http.py
# Copyright (C) 2015 LEAP
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.

"""
twisted.web utils for bonafide.
"""
import base64
import cookielib
import urllib

from twisted.internet import defer, protocol, reactor
from twisted.internet.ssl import Certificate
from twisted.python.filepath import FilePath
from twisted.web.client import Agent, CookieAgent
from twisted.web.client import BrowserLikePolicyForHTTPS
from twisted.web.http_headers import Headers
from twisted.web.iweb import IBodyProducer
from zope.interface import implements


def cookieAgentFactory(verify_path, connectTimeout=30):
    customPolicy = BrowserLikePolicyForHTTPS(
        Certificate.loadPEM(FilePath(verify_path).getContent()))
    agent = Agent(reactor, customPolicy, connectTimeout=connectTimeout)
    cookiejar = cookielib.CookieJar()
    return CookieAgent(agent, cookiejar)


def httpRequest(agent, url, values={}, headers={}, method='POST', token=None):
    data = ''
    if values:
        data = urllib.urlencode(values)
        headers['Content-Type'] = ['application/x-www-form-urlencoded']

    if token:
        headers['Authorization'] = ['Token token="%s"' % (bytes(token))]

    def handle_response(response):
        if response.code == 204:
            d = defer.succeed('')
        else:
            class SimpleReceiver(protocol.Protocol):
                def __init__(s, d):
                    s.buf = ''
                    s.d = d

                def dataReceived(s, data):
                    s.buf += data

                def connectionLost(s, reason):
                    # TODO: test if reason is twisted.web.client.ResponseDone,
                    # if not, do an errback
                    s.d.callback(s.buf)
            d = defer.Deferred()
            response.deliverBody(SimpleReceiver(d))
        return d

    d = agent.request(method, url, Headers(headers),
                      StringProducer(data) if data else None)
    d.addCallback(handle_response)
    return d


class StringProducer(object):

    implements(IBodyProducer)

    def __init__(self, body):
        self.body = body
        self.length = len(body)

    def startProducing(self, consumer):
        consumer.write(self.body)
        return defer.succeed(None)

    def pauseProducing(self):
        pass

    def stopProducing(self):
        pass