# Copyright (c) 2010 Google Inc. All rights reserved.
# Copyright (c) 2009 Apple Inc. All rights reserved.
#
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# modification, are permitted provided that the following conditions are
# met:
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#     * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
#     * Redistributions in binary form must reproduce the above
# copyright notice, this list of conditions and the following disclaimer
# in the documentation and/or other materials provided with the
# distribution.
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# contributors may be used to endorse or promote products derived from
# this software without specific prior written permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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import logging
import os
import sys

from webkitpy.common.checkout import Checkout
from webkitpy.common.checkout.scm.detection import SCMDetector
from webkitpy.common.memoized import memoized
from webkitpy.common.system.systemhost import SystemHost
from webkitpy.common.watchlist.watchlistparser import WatchListParser
from webkitpy.port.factory import PortFactory


_log = logging.getLogger(__name__)


class Host(SystemHost):
    def __init__(self):
        SystemHost.__init__(self)
        self._checkout = None

        # FIXME: Unfortunately Port objects are currently the central-dispatch objects of the NRWT world.
        # In order to instantiate a port correctly, we have to pass it at least an executive, user, scm, and filesystem
        # so for now we just pass along the whole Host object.
        # FIXME: PortFactory doesn't belong on this Host object if Port is going to have a Host (circular dependency).
        self.port_factory = PortFactory(self)

        self._engage_awesome_locale_hacks()

    @property
    @memoized
    def bugs(self):
        from webkitpy.common.net import bugzilla
        return bugzilla.Bugzilla()

    @property
    @memoized
    def buildbot(self):
        from webkitpy.common.net import buildbot
        return buildbot.BuildBot()

    @property
    @memoized
    def web(self):
        from webkitpy.common.net import web
        return web.Web()

    # We call this from the Host constructor, as it's one of the
    # earliest calls made for all webkitpy-based programs.
    def _engage_awesome_locale_hacks(self):
        # To make life easier on our non-english users, we override
        # the locale environment variables inside webkitpy.
        # If we don't do this, programs like SVN will output localized
        # messages and svn.py will fail to parse them.
        # FIXME: We should do these overrides *only* for the subprocesses we know need them!
        # This hack only works in unix environments.
        os.environ['LANGUAGE'] = 'en'
        os.environ['LANG'] = 'en_US.UTF-8'
        os.environ['LC_MESSAGES'] = 'en_US.UTF-8'
        os.environ['LC_ALL'] = 'en_US.UTF-8'

    def initialize_scm(self, patch_directories=None):
        detector = SCMDetector(self.filesystem, self.executive)
        self._checkout = Checkout(detector.default_scm(patch_directories))

    def scm(self):
        return self._checkout._scm

    def checkout(self):
        return self._checkout

    @memoized
    def watch_list(self):
        config_path = self.filesystem.dirname(self.filesystem.path_to_module('webkitpy.common.config'))
        watch_list_full_path = self.filesystem.join(config_path, 'watchlist')
        if not self.filesystem.exists(watch_list_full_path):
            raise Exception('Watch list file (%s) not found.' % watch_list_full_path)

        watch_list_contents = self.filesystem.read_text_file(watch_list_full_path)
        return WatchListParser().parse(watch_list_contents)