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

from modoboa.lib import parameters, events
from django.utils.translation import ugettext as _, ugettext_lazy
from django.db.utils import DatabaseError
from models import Extension

parameters.register_admin("AUTHENTICATION_TYPE", type="list", deflt="local",
                          values=[('local', ugettext_lazy("Local")),
                                  ('ldap', "LDAP")],
                          help=ugettext_lazy("The backend used for authentication"))
parameters.register_admin("CREATE_DIRECTORIES", type="list_yesno", deflt="yes",
			  help=ugettext_lazy("Modoboa will handle mailbox creation on filesystem"))
parameters.register_admin("STORAGE_PATH", type="string", deflt="/var/vmail",
                          help=ugettext_lazy("Path to the root directory where messages are stored"))
parameters.register_admin("VIRTUAL_UID", type="string", deflt="vmail",
                          help=ugettext_lazy("UID of the virtual user which owns domains/mailboxes/messages on the filesystem"))
parameters.register_admin("VIRTUAL_GID", type="string", deflt="vmail",
                          help=ugettext_lazy("GID of the virtual user which owns domains/mailboxes/messages on the filesystem"))
parameters.register_admin("MAILBOX_TYPE", type="list", deflt="maildir",
                          values=[("maildir", "maildir"), ("mbox", "mbox")],
                          help=ugettext_lazy("Mailboxes storage format"))
parameters.register_admin("MAILDIR_ROOT", type="string", deflt=".maildir",
                          help=ugettext_lazy("Sub-directory (inside the mailbox) where messages are stored when using the maildir format"))
parameters.register_admin(
    "PASSWORD_SCHEME", type="list", deflt="crypt",
    values=[("crypt", "crypt"), ("md5", "md5"), ("sha256", "sha256"), ("clear", "clear")],
    help=ugettext_lazy("Scheme used to crypt mailbox passwords")
    )
parameters.register_admin("ITEMS_PER_PAGE", type="int", deflt=30,
                          help=ugettext_lazy("Number of displayed items per page"))

def enabled_applications():
    """Return the list of currently enabled extensions

    Quick fix for #184:

    Just catch the DatabaseError exception raised when runnning the
    first ``syncdb`` command.

    :return: a list
    """
    result = [("admin", "admin"), ("userprefs", "userprefs")]
    try:
        exts = Extension.objects.filter(enabled=True)
        result += [(ext.name, ext.name) for ext in exts]
    except DatabaseError:
        pass
    return sorted(result, key=lambda e: e[0])

parameters.register_admin("DEFAULT_TOP_REDIRECTION", type="list", deflt="admin",
                          app="general",
                          values=enabled_applications(),
                          help=ugettext_lazy("The default redirection used when no application is specified"))

@events.observe("ExtDisabled")
def unset_default_topredirection(extension):
    """
    Simple callback to change the default redirection if the
    corresponding extension is being disabled.
    """
    topredirection = parameters.get_admin("DEFAULT_TOP_REDIRECTION", app="general")
    if topredirection == extension.name:
        parameters.save_admin("DEFAULT_TOP_REDIRECTION", "userprefs", app="general")

@events.observe("ExtDisabled", "ExtEnabled")
def update_available_applications(extension):
    """Simple callback to update the list of available applications

    Must be called each time an extension is disabled/enabled.
    """
    parameters.update_admin("DEFAULT_TOP_REDIRECTION", app="general",
                            values=enabled_applications())