# -*- coding: utf-8 -*-
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program.  If not, see <http://www.gnu.org/licenses/>.
"""
kallithea.model.permission
~~~~~~~~~~~~~~~~~~~~~~~~~~

permissions model for Kallithea

This file was forked by the Kallithea project in July 2014.
Original author and date, and relevant copyright and licensing information is below:
:created_on: Aug 20, 2010
:author: marcink
:copyright: (c) 2013 RhodeCode GmbH, and others.
:license: GPLv3, see LICENSE.md for more details.
"""


import logging
import traceback

from sqlalchemy.exc import DatabaseError

from kallithea.model.db import Permission, Session, User, \
    UserToPerm, UserRepoToPerm, UserRepoGroupToPerm, UserUserGroupToPerm
from kallithea.lib.utils2 import str2bool

log = logging.getLogger(__name__)


class PermissionModel(object):
    """
    Permissions model for Kallithea
    """

    def create_permissions(self):
        """
        Create permissions for whole system
        """
        for p in Permission.PERMS:
            if not Permission.get_by_key(p[0]):
                new_perm = Permission()
                new_perm.permission_name = p[0]
                Session().add(new_perm)

    def create_default_permissions(self, user, force=False):
        """
        Create missing default permissions for user. If force is set, the default
        permissions for the user are reset, otherwise only missing permissions are
        created.

        :param user:
        """
        user = User.guess_instance(user)

        def _make_perm(perm):
            new_perm = UserToPerm()
            new_perm.user = user
            new_perm.permission = Permission.get_by_key(perm)
            return new_perm

        def _get_group(perm_name):
            return '.'.join(perm_name.split('.')[:1])

        perms = UserToPerm.query().filter(UserToPerm.user == user).all()
        defined_perms_groups = map(_get_group,
                                (x.permission.permission_name for x in perms))
        log.debug('GOT ALREADY DEFINED:%s', perms)
        DEFAULT_PERMS = Permission.DEFAULT_USER_PERMISSIONS

        if force:
            for perm in perms:
                Session().delete(perm)
            Session().commit()
            defined_perms_groups = []
        # For every default permission that needs to be created, we check if
        # its group is already defined. If it's not, we create default permission.
        for perm_name in DEFAULT_PERMS:
            gr = _get_group(perm_name)
            if gr not in defined_perms_groups:
                log.debug('GR:%s not found, creating permission %s',
                          gr, perm_name)
                new_perm = _make_perm(perm_name)
                Session().add(new_perm)

    def update(self, form_result):
        perm_user = User.get_by_username(username=form_result['perm_user_name'])

        try:
            # stage 1 set anonymous access
            if perm_user.is_default_user:
                perm_user.active = str2bool(form_result['anonymous'])

            # stage 2 reset defaults and set them from form data
            def _make_new(usr, perm_name):
                log.debug('Creating new permission:%s', perm_name)
                new = UserToPerm()
                new.user = usr
                new.permission = Permission.get_by_key(perm_name)
                return new
            # clear current entries, to make this function idempotent
            # it will fix even if we define more permissions or permissions
            # are somehow missing
            u2p = UserToPerm.query() \
                .filter(UserToPerm.user == perm_user) \
                .all()
            for p in u2p:
                Session().delete(p)
            # create fresh set of permissions
            for def_perm_key in ['default_repo_perm',
                                 'default_group_perm',
                                 'default_user_group_perm',
                                 'default_repo_create',
                                 'create_on_write', # special case for create repos on write access to group
                                 #'default_repo_group_create', # not implemented yet
                                 'default_user_group_create',
                                 'default_fork',
                                 'default_register',
                                 'default_extern_activate']:
                p = _make_new(perm_user, form_result[def_perm_key])
                Session().add(p)

            # stage 3 update all default permissions for repos if checked
            if form_result['overwrite_default_repo']:
                _def_name = form_result['default_repo_perm'].split('repository.')[-1]
                _def = Permission.get_by_key('repository.' + _def_name)
                # repos
                for r2p in UserRepoToPerm.query() \
                               .filter(UserRepoToPerm.user == perm_user) \
                               .all():

                    # don't reset PRIVATE repositories
                    if not r2p.repository.private:
                        r2p.permission = _def

            if form_result['overwrite_default_group']:
                _def_name = form_result['default_group_perm'].split('group.')[-1]
                # groups
                _def = Permission.get_by_key('group.' + _def_name)
                for g2p in UserRepoGroupToPerm.query() \
                               .filter(UserRepoGroupToPerm.user == perm_user) \
                               .all():
                    g2p.permission = _def

            if form_result['overwrite_default_user_group']:
                _def_name = form_result['default_user_group_perm'].split('usergroup.')[-1]
                # groups
                _def = Permission.get_by_key('usergroup.' + _def_name)
                for g2p in UserUserGroupToPerm.query() \
                               .filter(UserUserGroupToPerm.user == perm_user) \
                               .all():
                    g2p.permission = _def

            Session().commit()
        except (DatabaseError,):
            log.error(traceback.format_exc())
            Session().rollback()
            raise