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#       to you under the Apache License, Version 2.0 (the
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#       with the License.  You may obtain a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
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#       specific language governing permissions and limitations
#       under the License.

from __future__ import unicode_literals
from __future__ import absolute_import
import os
import logging

import six
import tg
from paste.script import command
from paste.deploy import appconfig
from paste.deploy.converters import asbool
from tg.support.registry import Registry
from tg.wsgiapp import RequestLocals

import activitystream
import ming
from allura.config.environment import load_environment
from allura.lib.decorators import task
from allura.lib import helpers as h

log = None


@task
def run_command(command, args):
    """Run paster command asynchronously"""
    mod, cls = command.rsplit('.', 1)
    mod = __import__(mod, fromlist=[str(cls)])
    command = getattr(mod, cls)
    command = command(command.__name__)
    arg_list = h.shlex_split(args or '')
    try:
        command.parser.parse_args(arg_list)
    except SystemExit:
        raise Exception("Error parsing args: '%s'" % args)
    return command.run(arg_list)


class EmptyClass(object):
    pass


class MetaParserDocstring(type):
    @property
    def __doc__(cls):
        return cls.parser.format_help()


class Command(six.with_metaclass(MetaParserDocstring, command.Command)):
    min_args = 1
    max_args = 1
    usage = '[<ini file>]'
    group_name = 'Allura'

    @classmethod
    def post(cls, *args, **kw):
        cmd = '%s.%s' % (cls.__module__, cls.__name__)
        return run_command.post(cmd, *args, **kw)

    @ming.utils.LazyProperty
    def registry(self):
        return Registry()

    @ming.utils.LazyProperty
    def globals(self):
        import allura.lib.app_globals
        return allura.lib.app_globals.Globals()

    @ming.utils.LazyProperty
    def config(self):
        import tg
        return tg.config

    def basic_setup(self):
        global log, M
        if self.args[0]:
            # Probably being called from the command line - load the config
            # file
            self.config = conf = appconfig('config:%s' %
                                           self.args[0], relative_to=os.getcwd())
            # ... logging does not understand section#subsection syntax
            logging_config = self.args[0].split('#')[0]
            logging.config.fileConfig(
                logging_config, disable_existing_loggers=False)
            log = logging.getLogger('allura.command')
            log.info('Initialize command with config %r', self.args[0])
            load_environment(conf.global_conf, conf.local_conf)
            self.setup_globals()
            from allura import model
            M = model
            ming.configure(**conf)
            if asbool(conf.get('activitystream.recording.enabled', False)):
                activitystream.configure(**h.convert_bools(conf, prefix='activitystream.'))
            tg.tmpl_context.user = M.User.anonymous()
        else:
            # Probably being called from another script (websetup, perhaps?)
            log = logging.getLogger('allura.command')
            conf = tg.config
        self.tools = list(tg.app_globals.entry_points['tool'].values())
        for ep in h.iter_entry_points('allura.command_init'):
            log.info('Running command_init for %s', ep.name)
            ep.load()(conf)
        log.info('Loaded tools')

    def setup_globals(self):
        import allura.lib.app_globals
        self.registry.prepare()
        self.registry.register(allura.credentials, allura.lib.security.Credentials())
        # turbogears has its own special magic wired up for its globals, can't use a regular Registry
        tgl = RequestLocals()
        tgl.tmpl_context = EmptyClass()
        tgl.app_globals = self.globals
        tg.request_local.context._push_object(tgl)

    def teardown_globals(self):
        self.registry.cleanup()