import os

from warnings import warn

import wsgicors

from cubicweb.cwconfig import CubicWebConfiguration as cwcfg

from pyramid.config import Configurator

from pyramid.settings import asbool, aslist

try:

    from configparser import SafeConfigParser

except ImportError:

    from ConfigParser import SafeConfigParser

def make_cubicweb_application(cwconfig, settings=None):

    """

    Create a pyramid-based CubicWeb instance from a cubicweb configuration.

    It is initialy meant to be used by the 'pyramid' command of cubicweb-ctl.

    :param cwconfig: A CubicWeb configuration

    :returns: A Pyramid config object

    """

    settings_filenames = [os.path.join(cwconfig.apphome, 'pyramid.ini')]

    settings = dict(settings) if settings else {}

    if cwconfig.debugmode:

        settings_filenames.insert(

            0, os.path.join(cwconfig.apphome, 'pyramid-debug.ini'))

        settings.update({

            'pyramid.debug_authorization': True,

            'pyramid.debug_notfound': True,

            'pyramid.debug_routematch': True,

        })

    for fname in settings_filenames:

        if os.path.exists(fname):

            cp = SafeConfigParser()

            cp.read(fname)

            settings.update(cp.items('main'))

            break

    config = Configurator(settings=settings)

    if cwconfig.debugmode:

        try:

            config.include('pyramid_debugtoolbar')

        except ImportError:

            warn('pyramid_debugtoolbar package not available, install it to '

                 'get UI debug features', RuntimeWarning)

    config.registry['cubicweb.config'] = cwconfig

    config.registry['cubicweb.repository'] = repo = cwconfig.repository()

    config.registry['cubicweb.registry'] = repo.vreg

    if asbool(config.registry.settings.get('cubicweb.defaults', True)):

        config.include('pyramid_cubicweb.defaults')

    for name in aslist(config.registry.settings.get('cubicweb.includes', [])):

        config.include(name)

    config.include('pyramid_cubicweb.tools')

    config.include('pyramid_cubicweb.core')

    if asbool(config.registry.settings.get('cubicweb.bwcompat', True)):

        config.include('pyramid_cubicweb.bwcompat')

    return config

def wsgi_application_from_cwconfig(

        cwconfig,

        profile=False, profile_output=None, profile_dump_every=None):

    """ Build a WSGI application from a cubicweb configuration

    :param cwconfig: A CubicWeb configuration

    :param profile: Enable profiling. See :ref:`profiling`.

    :param profile_output: Profiling output filename. See :ref:`profiling`.

    :param profile_dump_every: Profiling number of requests before dumping the

                               stats. See :ref:`profiling`.

    :returns: A fully operationnal WSGI application

    """

    config = make_cubicweb_application(cwconfig)

    profile = profile or asbool(config.registry.settings.get(

        'cubicweb.profile.enable', False))

    if profile:

        config.add_route('profile_ping', '_profile/ping')

        config.add_route('profile_cnx', '_profile/cnx')

        config.scan('pyramid_cubicweb.profile')

    app = config.make_wsgi_app()

    # This replaces completely web/cors.py, which is not used by

    # pyramid_cubicweb anymore

    app = wsgicors.CORS(

        app,

        origin=' '.join(cwconfig['access-control-allow-origin']),

        headers=', '.join(cwconfig['access-control-allow-headers']),

        methods=', '.join(cwconfig['access-control-allow-methods']),

        credentials='true')

    if profile:

        from pyramid_cubicweb.profile import wsgi_profile

        filename = profile_output or config.registry.settings.get(

            'cubicweb.profile.output', 'program.prof')

        dump_every = profile_dump_every or config.registry.settings.get(

            'cubicweb.profile.dump_every', 100)

        app = wsgi_profile(app, filename=filename, dump_every=dump_every)

    return app

def wsgi_application(instance_name=None, debug=None):

    """ Build a WSGI application from a cubicweb instance name

    :param instance_name: Name of the cubicweb instance (optional). If not

                          provided, :envvar:`CW_INSTANCE` must exists.

    :param debug: Enable/disable the debug mode. If defined to True or False,

                  overrides :envvar:`CW_DEBUG`.

    The following environment variables are used if they exist:

    .. envvar:: CW_INSTANCE

        A CubicWeb instance name.

    .. envvar:: CW_DEBUG

        If defined, the debugmode is enabled.

    The function can be used as an entry-point for third-party wsgi containers.

    Below is a sample uswgi configuration file:

    .. code-block:: ini

        [uwsgi]

        http = 127.0.1.1:8080

        env = CW_INSTANCE=myinstance

        env = CW_DEBUG=1

        module = pyramid_cubicweb:wsgi_application()

        virtualenv = /home/user/.virtualenvs/myvirtualenv

        processes = 1

        threads = 8

        stats = 127.0.0.1:9191

        plugins = http,python

    """

    if instance_name is None:

        instance_name = os.environ.get('CW_INSTANCE')

    if debug is None:

        debug = 'CW_DEBUG' in os.environ

    cwconfig = cwcfg.config_for(instance_name, debugmode=debug)

    return wsgi_application_from_cwconfig(cwconfig)