"""common web configuration for twisted/modpython instances

:organization: Logilab
:copyright: 2001-2009 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
"""
__docformat__ = "restructuredtext en"
_ = unicode

import os
from os.path import join, exists, split

from logilab.common.configuration import Method
from logilab.common.decorators import cached

from cubicweb.toolsutils import read_config
from cubicweb.cwconfig import CubicWebConfiguration, register_persistent_options, merge_options


register_persistent_options( (
    # site-wide only web ui configuration
    ('site-title',
     {'type' : 'string', 'default': 'unset title',
      'help': _('site title'),
      'sitewide': True, 'group': 'ui',
      }),
    ('main-template',
     {'type' : 'string', 'default': 'main-template',
      'help': _('id of main template used to render pages'),
      'sitewide': True, 'group': 'ui',
      }),
    # user web ui configuration
    ('fckeditor',
     {'type' : 'yn', 'default': True,
      'help': _('should html fields being edited using fckeditor (a HTML '
                'WYSIWYG editor).  You should also select text/html as default '
                'text format to actually get fckeditor.'),
      'group': 'ui',
      }),
    # navigation configuration
    ('page-size',
     {'type' : 'int', 'default': 40,
      'help': _('maximum number of objects displayed by page of results'),
      'group': 'navigation',
      }),
    ('related-limit',
     {'type' : 'int', 'default': 8,
      'help': _('maximum number of related entities to display in the primary '
                'view'),
      'group': 'navigation',
      }),
    ('combobox-limit',
     {'type' : 'int', 'default': 20,
      'help': _('maximum number of entities to display in related combo box'),
      'group': 'navigation',
      }),

    ))


class WebConfiguration(CubicWebConfiguration):
    """the WebConfiguration is a singleton object handling instance's
    configuration and preferences
    """
    cubicweb_appobject_path = CubicWebConfiguration.cubicweb_appobject_path | set(['web/views'])
    cube_appobject_path = CubicWebConfiguration.cube_appobject_path | set(['views'])

    options = merge_options(CubicWebConfiguration.options + (
        ('anonymous-user',
         {'type' : 'string',
          'default': None,
          'help': 'login of the CubicWeb user account to use for anonymous user (if you want to allow anonymous)',
          'group': 'main', 'inputlevel': 1,
          }),
        ('anonymous-password',
         {'type' : 'string',
          'default': None,
          'help': 'password of the CubicWeb user account to use for anonymous user, '
          'if anonymous-user is set',
          'group': 'main', 'inputlevel': 1,
          }),
        ('query-log-file',
         {'type' : 'string',
          'default': None,
          'help': 'web instance query log file',
          'group': 'main', 'inputlevel': 2,
          }),
        # web configuration
        ('https-url',
         {'type' : 'string',
          'default': None,
          'help': 'web server root url on https. By specifying this option your '\
          'site can be available as an http and https site. Authenticated users '\
          'will in this case be authenticated and once done navigate through the '\
          'https site. IMPORTANTE NOTE: to do this work, you should have your '\
          'apache redirection include "https" as base url path so cubicweb can '\
          'differentiate between http vs https access. For instance: \n'\
          'RewriteRule ^/demo/(.*) http://127.0.0.1:8080/https/$1 [L,P]\n'\
          'where the cubicweb web server is listening on port 8080.',
          'group': 'main', 'inputlevel': 2,
          }),
        ('auth-mode',
         {'type' : 'choice',
          'choices' : ('cookie', 'http'),
          'default': 'cookie',
          'help': 'authentication mode (cookie / http)',
          'group': 'web', 'inputlevel': 1,
          }),
        ('realm',
         {'type' : 'string',
          'default': 'cubicweb',
          'help': 'realm to use on HTTP authentication mode',
          'group': 'web', 'inputlevel': 2,
          }),
        ('http-session-time',
         {'type' : 'int',
          'default': 0,
          'help': 'duration in seconds for HTTP sessions. 0 mean no expiration. '\
          'Should be greater than RQL server\'s session-time.',
          'group': 'web', 'inputlevel': 2,
          }),
        ('cleanup-session-time',
         {'type' : 'int',
          'default': 43200,
          'help': 'duration in seconds for which unused connections should be '\
          'closed, to limit memory consumption. This is different from '\
          'http-session-time since in some cases you may have an unexpired http '\
          'session (e.g. valid session cookie) which will trigger transparent '\
          'creation of a new session. In other cases, sessions may never expire \
          and cause memory leak. Should be smaller than http-session-time, '\
          'unless it\'s 0. Default to 12 h.',
          'group': 'web', 'inputlevel': 2,
          }),
        ('cleanup-anonymous-session-time',
         {'type' : 'int',
          'default': 120,
          'help': 'Same as cleanup-session-time but specific to anonymous '\
          'sessions. Default to 2 min.',
          'group': 'web', 'inputlevel': 2,
          }),
        ('force-html-content-type',
         {'type' : 'yn',
          'default': False,
          'help': 'force text/html content type for your html pages instead of cubicweb user-agent based'\
          'deduction of an appropriate content type',
          'group': 'web', 'inputlevel': 2,
          }),
        ('embed-allowed',
         {'type' : 'regexp',
          'default': None,
          'help': 'regular expression matching URLs that may be embeded. \
leave it blank if you don\'t want the embedding feature, or set it to ".*" \
if you want to allow everything',
          'group': 'web', 'inputlevel': 1,
          }),
        ('submit-mail',
         {'type' : 'string',
          'default': None,
          'help': ('Mail used as recipient to report bug in this instance, '
                   'if you want this feature on'),
          'group': 'web', 'inputlevel': 2,
          }),

        ('language-negociation',
         {'type' : 'yn',
          'default': True,
          'help': 'use Accept-Language http header to try to set user '\
          'interface\'s language according to browser defined preferences',
          'group': 'web', 'inputlevel': 2,
          }),

        ('print-traceback',
         {'type' : 'yn',
          'default': CubicWebConfiguration.mode != 'system',
          'help': 'print the traceback on the error page when an error occured',
          'group': 'web', 'inputlevel': 2,
          }),
        ))

    def fckeditor_installed(self):
        return exists(self.ext_resources['FCKEDITOR_PATH'])

    def eproperty_definitions(self):
        for key, pdef in super(WebConfiguration, self).eproperty_definitions():
            if key == 'ui.fckeditor' and not self.fckeditor_installed():
                continue
            yield key, pdef

    # method used to connect to the repository: 'inmemory' / 'pyro'
    # Pyro repository by default
    repo_method = 'pyro'

    # don't use @cached: we want to be able to disable it while this must still
    # be cached
    def repository(self, vreg=None):
        """return the instance's repository object"""
        try:
            return self.__repo
        except AttributeError:
            from cubicweb.dbapi import get_repository
            if self.repo_method == 'inmemory':
                repo = get_repository('inmemory', vreg=vreg, config=self)
            else:
                repo = get_repository('pyro', self['pyro-instance-id'],
                                      config=self)
            self.__repo = repo
            return repo

    def vc_config(self):
        return self.repository().get_versions()

    # mapping to external resources (id -> path) (`external_resources` file) ##
    ext_resources = {
        'FAVICON':  'DATADIR/favicon.ico',
        'LOGO':     'DATADIR/logo.png',
        'RSS_LOGO': 'DATADIR/rss.png',
        'HELP':     'DATADIR/help.png',
        'CALENDAR_ICON': 'DATADIR/calendar.gif',
        'SEARCH_GO':'DATADIR/go.png',

        'FCKEDITOR_PATH':  '/usr/share/fckeditor/',

        'IE_STYLESHEETS':    ['DATADIR/cubicweb.ie.css'],
        'STYLESHEETS':       ['DATADIR/cubicweb.css'],
        'STYLESHEETS_PRINT': ['DATADIR/cubicweb.print.css'],

        'JAVASCRIPTS':       ['DATADIR/jquery.js',
                              'DATADIR/jquery.corner.js',
                              'DATADIR/jquery.json.js',
                              'DATADIR/cubicweb.compat.js',
                              'DATADIR/cubicweb.python.js',
                              'DATADIR/cubicweb.htmlhelpers.js'],
        }


    def anonymous_user(self):
        """return a login and password to use for anonymous users. None
        may be returned for both if anonymous connections are not allowed
        """
        try:
            user = self['anonymous-user']
            passwd = self['anonymous-password']
        except KeyError:
            user, passwd = None, None
        if user is not None:
            user = unicode(user)
        return user, passwd

    def has_resource(self, rid):
        """return true if an external resource is defined"""
        return bool(self.ext_resources.get(rid))

    @cached
    def locate_resource(self, rid):
        """return the directory where the given resource may be found"""
        return self._fs_locate(rid, 'data')

    @cached
    def locate_doc_file(self, fname):
        """return the directory where the given resource may be found"""
        return self._fs_locate(fname, 'wdoc')

    def _fs_locate(self, rid, rdirectory):
        """return the directory where the given resource may be found"""
        path = [self.apphome] + self.cubes_path() + [join(self.shared_dir())]
        for directory in path:
            if exists(join(directory, rdirectory, rid)):
                return join(directory, rdirectory)

    def locate_all_files(self, rid, rdirectory='wdoc'):
        """return all files corresponding to the given resource"""
        path = [self.apphome] + self.cubes_path() + [join(self.shared_dir())]
        for directory in path:
            fpath = join(directory, rdirectory, rid)
            if exists(fpath):
                yield join(fpath)

    def load_configuration(self):
        """load instance's configuration files"""
        super(WebConfiguration, self).load_configuration()
        # load external resources definition
        self._build_ext_resources()
        self._init_base_url()

    def _init_base_url(self):
        # normalize base url(s)
        baseurl = self['base-url']
        if baseurl and baseurl[-1] != '/':
            baseurl += '/'
            self.global_set_option('base-url', baseurl)
        httpsurl = self['https-url']
        if httpsurl and httpsurl[-1] != '/':
            httpsurl += '/'
            self.global_set_option('https-url', httpsurl)

    def _build_ext_resources(self):
        libresourcesfile = join(self.shared_dir(), 'data', 'external_resources')
        self.ext_resources.update(read_config(libresourcesfile))
        for path in reversed([self.apphome] + self.cubes_path()):
            resourcesfile = join(path, 'data', 'external_resources')
            if exists(resourcesfile):
                self.debug('loading %s', resourcesfile)
                self.ext_resources.update(read_config(resourcesfile))
        resourcesfile = join(self.apphome, 'external_resources')
        if exists(resourcesfile):
            self.debug('loading %s', resourcesfile)
            self.ext_resources.update(read_config(resourcesfile))
        for resource in ('STYLESHEETS', 'STYLESHEETS_PRINT',
                         'IE_STYLESHEETS', 'JAVASCRIPTS'):
            val = self.ext_resources[resource]
            if isinstance(val, str):
                files = [w.strip() for w in val.split(',') if w.strip()]
                self.ext_resources[resource] = files


    # static files handling ###################################################

    @property
    def static_directory(self):
        return join(self.appdatahome, 'static')

    def static_file_exists(self, rpath):
        return exists(join(self.static_directory, rpath))

    def static_file_open(self, rpath, mode='wb'):
        staticdir = self.static_directory
        rdir, filename = split(rpath)
        if rdir:
            staticdir = join(staticdir, rdir)
            os.makedirs(staticdir)
        return file(join(staticdir, filename), mode)

    def static_file_add(self, rpath, data):
        stream = self.static_file_open(rpath)
        stream.write(data)
        stream.close()

    def static_file_del(self, rpath):
        if self.static_file_exists(rpath):
            os.remove(join(self.static_directory, rpath))