"""provide utilies for web (live) unit testing"""

import socket

import logging

from os.path import join, dirname, exists

from StringIO import StringIO

#from twisted.application import service, strports

# from twisted.internet import reactor, task

from twisted.web2 import channel

from twisted.web2 import server

from twisted.web2 import static

from twisted.internet import reactor

from twisted.internet.error import CannotListenError

from logilab.common.testlib import TestCase

import cubicweb.web

from cubicweb.dbapi import in_memory_cnx

from cubicweb.etwist.server import CubicWebRootResource

from cubicweb.devtools import LivetestConfiguration, init_test_database

def get_starturl(port=7777, login=None, passwd=None):

    if login:

        return 'http://%s:%s/view?login=%s&password=%s' % (socket.gethostname(), port, login, passwd)

    else:

        return 'http://%s:%s/' % (socket.gethostname(), port)

class LivetestResource(CubicWebRootResource):

    """redefines main resource to search for data files in several directories"""

    def locateChild(self, request, segments):

        """Indicate which resource to use to process down the URL's path"""

        if len(segments) and segments[0] == 'data':

            # Anything in data/ is treated as static files

            dirlist = [self.data_dir, join(dirname(cubicweb.web.__file__), 'data')]

            for alternative in dirlist:

                filepath = join(alternative, *segments[1:]) 

                if exists(filepath):

                    self.info('publish static file: %s', '/'.join(segments))

                    return static.File(filepath), ()

        # Otherwise we use this single resource

        return self, ()

def make_site(cube, options=None):

    from cubicweb.etwist import twconfig # trigger configuration registration

    sourcefile = options.sourcefile

    config = LivetestConfiguration(cube, sourcefile,

                                   pyro_name=options.pyro_name,

                                   log_threshold=logging.DEBUG)

    source = config.sources()['system']

    init_test_database(driver=source['db-driver'], config=config)

    # if '-n' in sys.argv: # debug mode

    cubicweb = LivetestResource(config, debug=True)

    toplevel = cubicweb

    website = server.Site(toplevel)

    cube_dir = config.cube_dir(cube)

    for port in xrange(7777, 7798):

        try:

            reactor.listenTCP(port, channel.HTTPFactory(website))

            saveconf(cube_dir, port, source['db-user'], source['db-password'])

            break

        except CannotListenError, exc:

            print "port %s already in use, I will try another one" % port

    else:

        raise

    cubicweb.base_url = get_starturl(port=port)

    print "you can go here : %s" % cubicweb.base_url

def runserver():

    reactor.run()

def saveconf(templhome, port, user, passwd):

    import pickle

    conffile = file(join(templhome, 'test', 'livetest.conf'), 'w')

    pickle.dump((port, user, passwd, get_starturl(port, user, passwd)),

                conffile)

    conffile.close()

def loadconf(filename='livetest.conf'):

    import pickle

    return pickle.load(file(filename))

def execute_scenario(filename, **kwargs):

    """based on twill.parse.execute_file, but inserts cubicweb extensions"""

    from twill.parse import _execute_script

    stream = StringIO('extend_with cubicweb.devtools.cubicwebtwill\n' + file(filename).read())

    kwargs['source'] = filename

    _execute_script(stream, **kwargs)

def hijack_twill_output(new_output):

    from twill import commands as twc

    from twill import browser as twb

    twc.OUT = new_output

    twb.OUT = new_output

class LiveTestCase(TestCase):

    sourcefile = None

    cube = ''

    def setUp(self):

        assert self.cube, "You must specify a cube in your testcase"

        # twill can be quite verbose ...

        self.twill_output = StringIO()

        hijack_twill_output(self.twill_output)

        # build a config, and get a connection

        self.config = LivetestConfiguration(self.cube, self.sourcefile)

        _, user, passwd, _ = loadconf()

        self.repo, self.cnx = in_memory_cnx(self.config, user, passwd)

        self.setup_db(self.cnx)

    def tearDown(self):

        self.teardown_db(self.cnx)

    def setup_db(self, cnx):

        """override setup_db() to setup your environment"""

    def teardown_db(self, cnx):

        """override teardown_db() to clean up your environment"""

    def get_loggedurl(self):

        port, user, passwd, logged_url = loadconf()

        return logged_url

    def get_anonurl(self):

        port, _, _, _ = loadconf()

        return 'http://%s:%s/view?login=anon&password=anon' % (

            socket.gethostname(), port)

    # convenience

    execute_scenario = staticmethod(execute_scenario)

if __name__ == '__main__':

    runserver()