# -*- coding: utf-8 -*-

"""common configuration utilities for cubicweb

:organization: Logilab

:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.

:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr

If cubicweb is a mercurial checkout (eg `CWDEV` is true), located in

`CW_SOFTWARE_ROOT`:

 * main cubes directory is `<CW_SOFTWARE_ROOT>/../cubes`. You can specify

   another one with `CW_INSTANCES_DIR` environment variable or simply add some

   other directories by using `CW_CUBES_PATH`.

 * cubicweb migration files are by default searched in

   `<CW_SOFTWARE_ROOT>/misc/migration` instead of

   `<install prefix>/share/cubicweb/migration/`

 * Cubicweb will start in 'user' mode (see below)

On startup, Cubicweb is using a specific *mode*. A mode corresponds to some

default setting for various resource directories. There are currently 2 main

modes : 'system', for system wide installation, and 'user', fur user local

installation (e.g. no root privileges).

'user' mode is activated automatically when cubicweb is a mercurial checkout

(e.g.  has a .hg directory). You can also force mode by using the `CW_MODE`

environment variable, to:

* use system wide installation but user specific instances and all, without root

  privileges on the system (`export CW_MODE=user`)

* use local checkout of cubicweb on system wide instances (requires root

  privileges on the system (`export CW_MODE=system`)

 Here is the default resource directories settings according to mode:

* 'system': ::

        CW_INSTANCES_DIR = /etc/cubicweb.d/

        CW_INSTANCES_DATA_DIR = /var/lib/cubicweb/instances/

        CW_RUNTIME_DIR = /var/run/cubicweb/

 * 'user': ::

        CW_INSTANCES_DIR = ~/etc/cubicweb.d/

        CW_INSTANCES_DATA_DIR = ~/etc/cubicweb.d/

        CW_RUNTIME_DIR = /tmp

.. envvar:: CW_MODE

   Resource mode: user or system

.. envvar:: CW_CUBES_PATH

   Augments the default search path for cubes

.. envvar:: CW_INSTANCES_DIR

   Directory where cubicweb instances will be found

.. envvar:: CW_INSTANCES_DATA_DIR

   Directory where cubicweb instances data will be written

.. envvar:: CW_RUNTIME_DIR

   Directory where pid files will be written

:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses

"""

__docformat__ = "restructuredtext en"

_ = unicode

import sys

import os

import logging

from smtplib import SMTP

from threading import Lock

from os.path import (exists, join, expanduser, abspath, normpath,

                     basename, isdir, dirname)

from warnings import warn

from logilab.common.decorators import cached, classproperty

from logilab.common.deprecation import deprecated

from logilab.common.logging_ext import set_log_methods, init_log

from logilab.common.configuration import (Configuration, Method,

                                          ConfigurationMixIn, merge_options)

from cubicweb import (CW_SOFTWARE_ROOT, CW_MIGRATION_MAP,

                      ConfigurationError, Binary)

from cubicweb.toolsutils import env_path, create_dir

CONFIGURATIONS = []

SMTP_LOCK = Lock()

class metaconfiguration(type):

    """metaclass to automaticaly register configuration"""

    def __new__(mcs, name, bases, classdict):

        cls = super(metaconfiguration, mcs).__new__(mcs, name, bases, classdict)

        if classdict.get('name'):

            CONFIGURATIONS.append(cls)

        return cls

def configuration_cls(name):

    """return the configuration class registered with the given name"""

    try:

        return [c for c in CONFIGURATIONS if c.name == name][0]

    except IndexError:

        raise ConfigurationError('no such config %r (check it exists with "cubicweb-ctl list")' % name)

def possible_configurations(directory):

    """return a list of installed configurations in a directory

    according to \*-ctl files

    """

    return [name for name in ('repository', 'twisted', 'all-in-one')

            if exists(join(directory, '%s.conf' % name))]

def guess_configuration(directory):

    """try to guess the configuration to use for a directory. If multiple

    configurations are found, ConfigurationError is raised

    """

    modes = possible_configurations(directory)

    if len(modes) != 1:

        raise ConfigurationError('unable to guess configuration from %r %s'

                                 % (directory, modes))

    return modes[0]

def _find_prefix(start_path=CW_SOFTWARE_ROOT):

    """Runs along the parent directories of *start_path* (default to cubicweb source directory)

    looking for one containing a 'share/cubicweb' directory.

    The first matching directory is assumed as the prefix installation of cubicweb

    Returns the matching prefix or None.

    """

    prefix = start_path

    old_prefix = None

    if not isdir(start_path):

        prefix = dirname(start_path)

    while not isdir(join(prefix, 'share', 'cubicweb')) and prefix != old_prefix:

        old_prefix = prefix

        prefix = dirname(prefix)

    if isdir(join(prefix, 'share', 'cubicweb')):

        return prefix

    return sys.prefix

# persistent options definition

PERSISTENT_OPTIONS = (

    ('encoding',

     {'type' : 'string',

      'default': 'UTF-8',

      'help': _('user interface encoding'),

      'group': 'ui', 'sitewide': True,

      }),

    ('language',

     {'type' : 'string',

      'default': 'en',

      'vocabulary': Method('available_languages'),

      'help': _('language of the user interface'),

      'group': 'ui',

      }),

    ('date-format',

     {'type' : 'string',

      'default': '%Y/%m/%d',

      'help': _('how to format date in the ui ("man strftime" for format description)'),

      'group': 'ui',

      }),

    ('datetime-format',

     {'type' : 'string',

      'default': '%Y/%m/%d %H:%M',

      'help': _('how to format date and time in the ui ("man strftime" for format description)'),

      'group': 'ui',

      }),

    ('time-format',

     {'type' : 'string',

      'default': '%H:%M',

      'help': _('how to format time in the ui ("man strftime" for format description)'),

      'group': 'ui',

      }),

    ('float-format',

     {'type' : 'string',

      'default': '%.3f',

      'help': _('how to format float numbers in the ui'),

      'group': 'ui',

      }),

    ('default-text-format',

     {'type' : 'choice',

      'choices': ('text/plain', 'text/rest', 'text/html'),

      'default': 'text/html', # use fckeditor in the web ui

      'help': _('default text format for rich text fields.'),

      'group': 'ui',

      }),

    ('short-line-size',

     {'type' : 'int',

      'default': 40,

      'help': _('maximum number of characters in short description'),

      'group': 'navigation',

      }),

    )

def register_persistent_options(options):

    global PERSISTENT_OPTIONS

    PERSISTENT_OPTIONS = merge_options(PERSISTENT_OPTIONS + options)

CFGTYPE2ETYPE_MAP = {

    'string': 'String',

    'choice': 'String',

    'yn':     'Boolean',

    'int':    'Int',

    'float' : 'Float',

    }

_forced_mode = os.environ.get('CW_MODE')

assert _forced_mode in (None, 'system', 'user')

CWDEV = exists(join(CW_SOFTWARE_ROOT, '.hg'))

try:

    _INSTALL_PREFIX = os.environ['CW_INSTALL_PREFIX']

except KeyError:

    _INSTALL_PREFIX = _find_prefix()

class CubicWebNoAppConfiguration(ConfigurationMixIn):

    """base class for cubicweb configuration without a specific instance directory

    """

    __metaclass__ = metaconfiguration

    # to set in concrete configuration

    name = None

    # log messages format (see logging module documentation for available keys)

    log_format = '%(asctime)s - (%(name)s) %(levelname)s: %(message)s'

    # nor remove appobjects based on unused interface

    cleanup_interface_sobjects = True

    # debug mode

    debugmode = False

    if (CWDEV and _forced_mode != 'system'):

        mode = 'user'

        _CUBES_DIR = join(CW_SOFTWARE_ROOT, '../cubes')

    else:

        mode = _forced_mode or 'system'

        _CUBES_DIR = join(_INSTALL_PREFIX, 'share', 'cubicweb', 'cubes')

    CUBES_DIR = env_path('CW_CUBES_DIR', _CUBES_DIR, 'cubes', checkexists=False)

    CUBES_PATH = os.environ.get('CW_CUBES_PATH', '').split(os.pathsep)

    options = (

       ('log-threshold',

         {'type' : 'string', # XXX use a dedicated type?

          'default': 'WARNING',

          'help': 'server\'s log level',

          'group': 'main', 'inputlevel': 1,

          }),

        # pyro options

        ('pyro-instance-id',

         {'type' : 'string',

          'default': Method('default_instance_id'),

          'help': 'identifier of the CubicWeb instance in the Pyro name server',

          'group': 'pyro', 'inputlevel': 1,

          }),

        ('pyro-ns-host',

         {'type' : 'string',

          'default': '',

          'help': 'Pyro name server\'s host. If not set, will be detected by a \

broadcast query. It may contains port information using <host>:<port> notation.',

          'group': 'pyro', 'inputlevel': 1,

          }),

        ('pyro-ns-group',

         {'type' : 'string',

          'default': 'cubicweb',

          'help': 'Pyro name server\'s group where the repository will be \

registered.',

          'group': 'pyro', 'inputlevel': 1,

          }),

        # common configuration options which are potentially required as soon as

        # you're using "base" application objects (ie to really server/web

        # specific)

        ('base-url',

         {'type' : 'string',

          'default': None,

          'help': 'web server root url',

          'group': 'main', 'inputlevel': 1,

          }),

        ('allow-email-login',

         {'type' : 'yn',

          'default': False,

          'help': 'allow users to login with their primary email if set',

          'group': 'main', 'inputlevel': 2,

          }),

        ('use-request-subdomain',

         {'type' : 'yn',

          'default': None,

          'help': ('if set, base-url subdomain is replaced by the request\'s '

                   'host, to help managing sites with several subdomains in a '

                   'single cubicweb instance'),

          'group': 'main', 'inputlevel': 1,

          }),

        ('mangle-emails',

         {'type' : 'yn',

          'default': False,

          'help': "don't display actual email addresses but mangle them if \

this option is set to yes",

          'group': 'email', 'inputlevel': 2,

          }),

        )

    # static and class methods used to get instance independant resources ##

    @staticmethod

    def cubicweb_version():

        """return installed cubicweb version"""

        from logilab.common.changelog import Version

        from cubicweb import __pkginfo__

        version = __pkginfo__.numversion

        assert len(version) == 3, version

        return Version(version)

    @staticmethod

    def persistent_options_configuration():

        return Configuration(options=PERSISTENT_OPTIONS)

    @classmethod

    def shared_dir(cls):

        """return the shared data directory (i.e. directory where standard

        library views and data may be found)

        """

        if CWDEV:

            return join(CW_SOFTWARE_ROOT, 'web')

        return cls.cube_dir('shared')

    @classmethod

    def i18n_lib_dir(cls):

        """return instance's i18n directory"""

        if CWDEV:

            return join(CW_SOFTWARE_ROOT, 'i18n')

        return join(cls.shared_dir(), 'i18n')

    @classmethod

    def available_cubes(cls):

        cubes = set()

        for directory in cls.cubes_search_path():

            if not os.path.exists(directory):

                cls.error('unexistant directory in cubes search path: %s'

                           % directory)

                continue

            for cube in os.listdir(directory):

                if cube in ('CVS', '.svn', 'shared', '.hg'):

                    continue

                if isdir(join(directory, cube)):

                    cubes.add(cube)

        return sorted(cubes)

    @classmethod

    def cubes_search_path(cls):

        """return the path of directories where cubes should be searched"""

        if not cls.CUBES_DIR in path and exists(cls.CUBES_DIR):

            path.append(cls.CUBES_DIR)

        return path

    @classproperty

    def extrapath(cls):

        extrapath = {}

        for cubesdir in cls.cubes_search_path():

            if cubesdir != cls.CUBES_DIR:

                extrapath[cubesdir] = 'cubes'

        return extrapath

    @classmethod

    def cube_dir(cls, cube):

        """return the cube directory for the given cube id,

        raise `ConfigurationError` if it doesn't exists

        """

        for directory in cls.cubes_search_path():

            cubedir = join(directory, cube)

            if exists(cubedir):

                return cubedir

        raise ConfigurationError('no cube %s in %s' % (cube, cls.cubes_search_path()))

    @classmethod

    def cube_migration_scripts_dir(cls, cube):

        """cube migration scripts directory"""

        return join(cls.cube_dir(cube), 'migration')

    @classmethod

    def cube_pkginfo(cls, cube):

        """return the information module for the given cube"""

        cube = CW_MIGRATION_MAP.get(cube, cube)

        try:

            parent = __import__('cubes.%s.__pkginfo__' % cube)

            return getattr(parent, cube).__pkginfo__

        except Exception, ex:

            raise ConfigurationError(

                'unable to find packaging information for cube %s (%s: %s)'

                % (cube, ex.__class__.__name__, ex))

    @classmethod

    def cube_version(cls, cube):

        """return the version of the cube located in the given directory

        """

        from logilab.common.changelog import Version

        version = cls.cube_pkginfo(cube).numversion

        assert len(version) == 3, version

        return Version(version)

    @classmethod

    def _cube_deps(cls, cube, key, oldkey):

        """return cubicweb cubes used by the given cube"""