# copyright 2003-2012 LOGILAB S.A. (Paris, FRANCE), all rights reserved.

# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr

#

# This file is part of CubicWeb.

#

# CubicWeb is free software: you can redistribute it and/or modify it under the

# terms of the GNU Lesser General Public License as published by the Free

# Software Foundation, either version 2.1 of the License, or (at your option)

# any later version.

#

# CubicWeb 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 Lesser General Public License for more

# details.

#

# You should have received a copy of the GNU Lesser General Public License along

# with CubicWeb.  If not, see <http://www.gnu.org/licenses/>.

"""WSGI request handler for cubicweb"""

__docformat__ = "restructuredtext en"

from itertools import chain, repeat, izip

from cubicweb import AuthenticationError

from cubicweb.web import DirectResponse

from cubicweb.web.application import CubicWebPublisher

from cubicweb.wsgi.request import CubicWebWsgiRequest

# See http://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html

STATUS_CODE_TEXT = {

    100: 'CONTINUE',

    101: 'SWITCHING PROTOCOLS',

    200: 'OK',

    201: 'CREATED',

    202: 'ACCEPTED',

    203: 'NON-AUTHORITATIVE INFORMATION',

    204: 'NO CONTENT',

    205: 'RESET CONTENT',

    206: 'PARTIAL CONTENT',

    300: 'MULTIPLE CHOICES',

    301: 'MOVED PERMANENTLY',

    302: 'FOUND',

    303: 'SEE OTHER',

    304: 'NOT MODIFIED',

    305: 'USE PROXY',

    306: 'RESERVED',

    307: 'TEMPORARY REDIRECT',

    400: 'BAD REQUEST',

    401: 'UNAUTHORIZED',

    402: 'PAYMENT REQUIRED',

    403: 'FORBIDDEN',

    404: 'NOT FOUND',

    405: 'METHOD NOT ALLOWED',

    406: 'NOT ACCEPTABLE',

    407: 'PROXY AUTHENTICATION REQUIRED',

    408: 'REQUEST TIMEOUT',

    409: 'CONFLICT',

    410: 'GONE',

    411: 'LENGTH REQUIRED',

    412: 'PRECONDITION FAILED',

    413: 'REQUEST ENTITY TOO LARGE',

    414: 'REQUEST-URI TOO LONG',

    415: 'UNSUPPORTED MEDIA TYPE',

    416: 'REQUESTED RANGE NOT SATISFIABLE',

    417: 'EXPECTATION FAILED',

    500: 'INTERNAL SERVER ERROR',

    501: 'NOT IMPLEMENTED',

    502: 'BAD GATEWAY',

    503: 'SERVICE UNAVAILABLE',

    504: 'GATEWAY TIMEOUT',

    505: 'HTTP VERSION NOT SUPPORTED',

}

class WSGIResponse(object):

    """encapsulates the wsgi response parameters

    (code, headers and body if there is one)

    """

    def __init__(self, code, req, body=None):

        text = STATUS_CODE_TEXT.get(code, 'UNKNOWN STATUS CODE')

        self.status =  '%s %s' % (code, text)

        self.headers = list(chain(*[izip(repeat(k), v)

                                    for k, v in req.headers_out.getAllRawHeaders()]))

        self.headers = [(str(k), str(v)) for k, v in self.headers]

        if body:

            self.body = [body]

        else:

            self.body = []

    def __iter__(self):

        return iter(self.body)

class CubicWebWSGIApplication(object):

    """This is the wsgi application which will be called by the

    wsgi server with the WSGI ``environ`` and ``start_response``

    parameters.

    XXX: missing looping tasks and proper repository shutdown when

    the application is stopped.

    NOTE: no pyro

    """

    def __init__(self, config, vreg=None):

        self.appli = CubicWebPublisher(config, vreg=vreg)

        self.config = config

        self.base_url = self.config['base-url']

        self.https_url = self.config['https-url']

        self.url_rewriter = self.appli.vreg['components'].select_or_none('urlrewriter')

    def _render(self, req):

        """this function performs the actual rendering

        """

        if self.base_url is None:

            self.base_url = self.config._base_url = req.base_url()

        try:

            path = req.path

            result = self.appli.handle_request(req, path)

        except DirectResponse as ex:

            return ex.response

        return WSGIResponse(req.status_out, req, result)

    def __call__(self, environ, start_response):

        """WSGI protocol entry point"""

        req = CubicWebWsgiRequest(environ, self.appli.vreg)

        response = self._render(req)

        start_response(response.status, response.headers)

        return response.body

    # these are overridden by set_log_methods below

    # only defining here to prevent pylint from complaining

    info = warning = error = critical = exception = debug = lambda msg,*a,**kw: None

from logging import getLogger

from cubicweb import set_log_methods

set_log_methods(CubicWebWSGIApplication, getLogger('cubicweb.wsgi'))