# copyright 2003-2010 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.
#
# logilab-common 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/>.
import os
import sys

try:
    import win32serviceutil
    import win32service
except ImportError:
    print 'Win32 extensions for Python are likely not installed.'
    sys.exit(3)


from cubicweb.etwist.server import (CubicWebRootResource, reactor, server,
                                    parsePOSTData, channel)

import logging
from logging import getLogger, handlers
from cubicweb import set_log_methods
from cubicweb.cwconfig import CubicWebConfiguration as cwcfg

def _check_env(env):
    env_vars = ('CW_INSTANCES_DIR', 'CW_INSTANCES_DATA_DIR', 'CW_RUNTIME_DIR')
    for var in env_vars:
        if var not in env:
            raise Exception('The environment variables %s must be set.' % \
                            ', '.join(env_vars))            
    if not env.get('USERNAME'):
        env['USERNAME'] = 'cubicweb'

class CWService(object, win32serviceutil.ServiceFramework):
    _svc_name_ = None
    _svc_display_name_ = None
    instance = None

    def __init__(self, *args, **kwargs):
        win32serviceutil.ServiceFramework.__init__(self, *args, **kwargs)
        cwcfg.load_cwctl_plugins()
        logger = getLogger('cubicweb')
        set_log_methods(CubicWebRootResource, logger)
        server.parsePOSTData = parsePOSTData

    def SvcStop(self):
        self.ReportServiceStatus(win32service.SERVICE_STOP_PENDING)
        logger = getLogger('cubicweb.twisted')
        logger.info('stopping %s service' % self.instance)
        reactor.stop()
        self.ReportServiceStatus(win32service.SERVICE_STOP_PENDING)

    def SvcDoRun(self):
        self.ReportServiceStatus(win32service.SERVICE_START_PENDING)
        logger = getLogger('cubicweb.twisted')
        handler = handlers.NTEventLogHandler('cubicweb')
        handler.setLevel(logging.INFO)
        logger.addHandler(handler)
        logger.info('starting %s service' % self.instance)
        try:
            _check_env(os.environ)
            # create the site
            config = cwcfg.config_for(self.instance)
            root_resource = CubicWebRootResource(config, False)
            website = server.Site(root_resource)
            # serve it via standard HTTP on port set in the configuration
            port = config['port'] or 8080
            logger.info('listening on port %s' % port)
            reactor.listenTCP(port, channel.HTTPFactory(website))
            root_resource.init_publisher()
            root_resource.start_service()
            logger.info('instance started on %s', root_resource.base_url)
            self.ReportServiceStatus(win32service.SERVICE_RUNNING)
            reactor.run()
        except Exception, e:
            logger.error('service %s stopped (cause: %s)' % (self.instance, e))
            logger.exception('what happened ...')
        self.ReportServiceStatus(win32service.SERVICE_STOPPED)