# -*- 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.db_1_3_0
~~~~~~~~~~~~~~~~~~~~~~~~

Database Models for Kallithea <=1.3.X

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: Apr 08, 2010
:author: marcink
:copyright: (c) 2013 RhodeCode GmbH, and others.
:license: GPLv3, see LICENSE.md for more details.

"""


import os
import logging
import datetime
import traceback
from collections import defaultdict

from sqlalchemy import *
from sqlalchemy.ext.hybrid import hybrid_property
from sqlalchemy.orm import relationship, joinedload, class_mapper, validates
from beaker.cache import cache_region, region_invalidate

from kallithea.lib.vcs import get_backend
from kallithea.lib.vcs.utils.helpers import get_scm
from kallithea.lib.vcs.exceptions import VCSError
from kallithea.lib.vcs.utils.lazy import LazyProperty

from kallithea.lib.utils2 import str2bool, safe_str, get_changeset_safe, \
    safe_unicode
from kallithea.lib.compat import json
from kallithea.lib.caching_query import FromCache

from kallithea.model.meta import Base, Session
import hashlib

from kallithea import DB_PREFIX

log = logging.getLogger(__name__)

#==============================================================================
# BASE CLASSES
#==============================================================================

_hash_key = lambda k: hashlib.md5(safe_str(k)).hexdigest()


class ModelSerializer(json.JSONEncoder):
    """
    Simple Serializer for JSON,

    usage::

        to make object customized for serialization implement a __json__
        method that will return a dict for serialization into json

    example::

        class Task(object):

            def __init__(self, name, value):
                self.name = name
                self.value = value

            def __json__(self):
                return dict(name=self.name,
                            value=self.value)

    """

    def default(self, obj):

        if hasattr(obj, '__json__'):
            return obj.__json__()
        else:
            return json.JSONEncoder.default(self, obj)


class BaseModel(object):
    """
    Base Model for all classess
    """

    @classmethod
    def _get_keys(cls):
        """return column names for this model """
        return class_mapper(cls).c.keys()

    def get_dict(self):
        """
        return dict with keys and values corresponding
        to this model data """

        d = {}
        for k in self._get_keys():
            d[k] = getattr(self, k)

        # also use __json__() if present to get additional fields
        for k, val in getattr(self, '__json__', lambda: {})().iteritems():
            d[k] = val
        return d

    def get_appstruct(self):
        """return list with keys and values tupples corresponding
        to this model data """

        l = []
        for k in self._get_keys():
            l.append((k, getattr(self, k),))
        return l

    def populate_obj(self, populate_dict):
        """populate model with data from given populate_dict"""

        for k in self._get_keys():
            if k in populate_dict:
                setattr(self, k, populate_dict[k])

    @classmethod
    def query(cls):
        return Session.query(cls)

    @classmethod
    def get(cls, id_):
        if id_:
            return cls.query().get(id_)

    @classmethod
    def getAll(cls):
        return cls.query().all()

    @classmethod
    def delete(cls, id_):
        obj = cls.query().get(id_)
        Session.delete(obj)

    def __repr__(self):
        if hasattr(self, '__unicode__'):
            # python repr needs to return str
            return safe_str(self.__unicode__())
        return '<DB:%s>' % (self.__class__.__name__)

class Setting(Base, BaseModel):
    __tablename__ = DB_PREFIX + 'settings'
    __table_args__ = (
        UniqueConstraint('app_settings_name'),
        {'extend_existing': True, 'mysql_engine':'InnoDB',
         'mysql_charset': 'utf8'}
    )
    app_settings_id = Column("app_settings_id", Integer(), nullable=False, unique=True, default=None, primary_key=True)
    app_settings_name = Column("app_settings_name", String(length=255, convert_unicode=False, assert_unicode=None), nullable=True, unique=None, default=None)
    _app_settings_value = Column("app_settings_value", String(length=255, convert_unicode=False, assert_unicode=None), nullable=True, unique=None, default=None)

    def __init__(self, k='', v=''):
        self.app_settings_name = k
        self.app_settings_value = v

    @validates('_app_settings_value')
    def validate_settings_value(self, key, val):
        assert type(val) == unicode
        return val

    @hybrid_property
    def app_settings_value(self):
        v = self._app_settings_value
        if self.app_settings_name == 'ldap_active':
            v = str2bool(v)
        return v

    @app_settings_value.setter
    def app_settings_value(self, val):
        """
        Setter that will always make sure we use unicode in app_settings_value

        :param val:
        """
        self._app_settings_value = safe_unicode(val)

    def __unicode__(self):
        return u"<%s('%s:%s')>" % (
            self.__class__.__name__,
            self.app_settings_name, self.app_settings_value
        )

    @classmethod
    def get_by_name(cls, ldap_key):
        return cls.query()\
            .filter(cls.app_settings_name == ldap_key).scalar()

    @classmethod
    def get_app_settings(cls, cache=False):

        ret = cls.query()

        if cache:
            ret = ret.options(FromCache("sql_cache_short", "get_hg_settings"))

        if not ret:
            raise Exception('Could not get application settings !')
        settings = {}
        for each in ret:
            settings[each.app_settings_name] = \
                each.app_settings_value

        return settings

    @classmethod
    def get_ldap_settings(cls, cache=False):
        ret = cls.query()\
                .filter(cls.app_settings_name.startswith('ldap_')).all()
        fd = {}
        for row in ret:
            fd.update({row.app_settings_name:row.app_settings_value})

        return fd


class Ui(Base, BaseModel):
    __tablename__ = DB_PREFIX + 'ui'
    __table_args__ = (
        UniqueConstraint('ui_key'),
        {'extend_existing': True, 'mysql_engine':'InnoDB',
         'mysql_charset': 'utf8'}
    )

    HOOK_UPDATE = 'changegroup.update'
    HOOK_REPO_SIZE = 'changegroup.repo_size'
    HOOK_PUSH = 'pretxnchangegroup.push_logger'
    HOOK_PULL = 'preoutgoing.pull_logger'

    ui_id = Column("ui_id", Integer(), nullable=False, unique=True, default=None, primary_key=True)
    ui_section = Column("ui_section", String(length=255, convert_unicode=False, assert_unicode=None), nullable=True, unique=None, default=None)
    ui_key = Column("ui_key", String(length=255, convert_unicode=False, assert_unicode=None), nullable=True, unique=None, default=None)
    ui_value = Column("ui_value", String(length=255, convert_unicode=False, assert_unicode=None), nullable=True, unique=None, default=None)
    ui_active = Column("ui_active", Boolean(), nullable=True, unique=None, default=True)

    @classmethod
    def get_by_key(cls, key):
        return cls.query().filter(cls.ui_key == key)

    @classmethod
    def get_builtin_hooks(cls):
        q = cls.query()
        q = q.filter(cls.ui_key.in_([cls.HOOK_UPDATE,
                                    cls.HOOK_REPO_SIZE,
                                    cls.HOOK_PUSH, cls.HOOK_PULL]))
        return q.all()

    @classmethod
    def get_custom_hooks(cls):
        q = cls.query()
        q = q.filter(~cls.ui_key.in_([cls.HOOK_UPDATE,
                                    cls.HOOK_REPO_SIZE,
                                    cls.HOOK_PUSH, cls.HOOK_PULL]))
        q = q.filter(cls.ui_section == 'hooks')
        return q.all()

    @classmethod
    def create_or_update_hook(cls, key, val):
        new_ui = cls.get_by_key(key).scalar() or cls()
        new_ui.ui_section = 'hooks'
        new_ui.ui_active = True
        new_ui.ui_key = key
        new_ui.ui_value = val

        Session.add(new_ui)


class User(Base, BaseModel):
    __tablename__ = 'users'
    __table_args__ = (
        UniqueConstraint('username'), UniqueConstraint('email'),
        {'extend_existing': True, 'mysql_engine':'InnoDB',
         'mysql_charset': 'utf8'}
    )
    user_id = Column("user_id", Integer(), nullable=False, unique=True, default=None, primary_key=True)
    username = Column("username", String(length=255, convert_unicode=False, assert_unicode=None), nullable=True, unique=None, default=None)
    password = Column("password", String(length=255, convert_unicode=False, assert_unicode=None), nullable=True, unique=None, default=None)
    active = Column("active", Boolean(), nullable=True, unique=None, default=None)
    admin = Column("admin", Boolean(), nullable=True, unique=None, default=False)
    name = Column("name", String(length=255, convert_unicode=False, assert_unicode=None), nullable=True, unique=None, default=None)
    lastname = Column("lastname", String(length=255, convert_unicode=False, assert_unicode=None), nullable=True, unique=None, default=None)
    _email = Column("email", String(length=255, convert_unicode=False, assert_unicode=None), nullable=True, unique=None, default=None)
    last_login = Column("last_login", DateTime(timezone=False), nullable=True, unique=None, default=None)
    ldap_dn = Column("ldap_dn", String(length=255, convert_unicode=False, assert_unicode=None), nullable=True, unique=None, default=None)
    api_key = Column("api_key", String(length=255, convert_unicode=False, assert_unicode=None), nullable=True, unique=None, default=None)

    user_log = relationship('UserLog', cascade='all')
    user_perms = relationship('UserToPerm', primaryjoin="User.user_id==UserToPerm.user_id", cascade='all')

    repositories = relationship('Repository')
    user_followers = relationship('UserFollowing', primaryjoin='UserFollowing.follows_user_id==User.user_id', cascade='all')
    repo_to_perm = relationship('UserRepoToPerm', primaryjoin='UserRepoToPerm.user_id==User.user_id', cascade='all')
    repo_group_to_perm = relationship('UserRepoGroupToPerm', primaryjoin='UserRepoGroupToPerm.user_id==User.user_id', cascade='all')

    group_member = relationship('UserGroupMember', cascade='all')

    notifications = relationship('UserNotification', cascade='all')
    # notifications assigned to this user
    user_created_notifications = relationship('Notification', cascade='all')
    # comments created by this user
    user_comments = relationship('ChangesetComment', cascade='all')

    @hybrid_property
    def email(self):
        return self._email

    @email.setter
    def email(self, val):
        self._email = val.lower() if val else None

    @property
    def full_name(self):
        return '%s %s' % (self.name, self.lastname)

    @property
    def full_name_or_username(self):
        return ('%s %s' % (self.name, self.lastname)
                if (self.name and self.lastname) else self.username)

    @property
    def full_contact(self):
        return '%s %s <%s>' % (self.name, self.lastname, self.email)

    @property
    def short_contact(self):
        return '%s %s' % (self.name, self.lastname)

    @property
    def is_admin(self):
        return self.admin

    def __unicode__(self):
        return u"<%s('id:%s:%s')>" % (self.__class__.__name__,
                                     self.user_id, self.username)

    @classmethod
    def get_by_username(cls, username, case_insensitive=False, cache=False):
        if case_insensitive:
            q = cls.query().filter(cls.username.ilike(username))
        else:
            q = cls.query().filter(cls.username == username)

        if cache:
            q = q.options(FromCache(
                            "sql_cache_short",
                            "get_user_%s" % _hash_key(username)
                          )
            )
        return q.scalar()

    @classmethod
    def get_by_api_key(cls, api_key, cache=False):
        q = cls.query().filter(cls.api_key == api_key)

        if cache:
            q = q.options(FromCache("sql_cache_short",
                                    "get_api_key_%s" % api_key))
        return q.scalar()

    @classmethod
    def get_by_email(cls, email, case_insensitive=False, cache=False):
        if case_insensitive:
            q = cls.query().filter(cls.email.ilike(email))
        else:
            q = cls.query().filter(cls.email == email)

        if cache:
            q = q.options(FromCache("sql_cache_short",
                                    "get_api_key_%s" % email))
        return q.scalar()

    def update_lastlogin(self):
        """Update user lastlogin"""
        self.last_login = datetime.datetime.now()
        Session.add(self)
        log.debug('updated user %s lastlogin' % self.username)

    def __json__(self):
        return dict(
            user_id=self.user_id,
            first_name=self.name,
            last_name=self.lastname,
            email=self.email,
            full_name=self.full_name,
            full_name_or_username=self.full_name_or_username,
            short_contact=self.short_contact,
            full_contact=self.full_contact
        )


class UserLog(Base, BaseModel):
    __tablename__ = 'user_logs'
    __table_args__ = (
        {'extend_existing': True, 'mysql_engine':'InnoDB',
         'mysql_charset': 'utf8'},
    )
    user_log_id = Column("user_log_id", Integer(), nullable=False, unique=True, default=None, primary_key=True)
    user_id = Column("user_id", Integer(), ForeignKey('users.user_id'), nullable=False, unique=None, default=None)
    repository_id = Column("repository_id", Integer(), ForeignKey('repositories.repo_id'), nullable=True)
    repository_name = Column("repository_name", String(length=255, convert_unicode=False, assert_unicode=None), nullable=True, unique=None, default=None)
    user_ip = Column("user_ip", String(length=255, convert_unicode=False, assert_unicode=None), nullable=True, unique=None, default=None)
    action = Column("action", UnicodeText(length=1200000, convert_unicode=False, assert_unicode=None), nullable=True, unique=None, default=None)
    action_date = Column("action_date", DateTime(timezone=False), nullable=True, unique=None, default=None)

    @property
    def action_as_day(self):
        return datetime.date(*self.action_date.timetuple()[:3])

    user = relationship('User')
    repository = relationship('Repository', cascade='')


class UserGroup(Base, BaseModel):
    __tablename__ = 'users_groups'
    __table_args__ = (
        {'extend_existing': True, 'mysql_engine':'InnoDB',
         'mysql_charset': 'utf8'},
    )

    users_group_id = Column("users_group_id", Integer(), nullable=False, unique=True, default=None, primary_key=True)
    users_group_name = Column("users_group_name", String(length=255, convert_unicode=False, assert_unicode=None), nullable=False, unique=True, default=None)
    users_group_active = Column("users_group_active", Boolean(), nullable=True, unique=None, default=None)

    members = relationship('UserGroupMember', cascade="all, delete, delete-orphan", lazy="joined")
    users_group_to_perm = relationship('UserGroupToPerm', cascade='all')
    users_group_repo_to_perm = relationship('UserGroupRepoToPerm', cascade='all')

    def __unicode__(self):
        return u'<userGroup(%s)>' % (self.users_group_name)

    @classmethod
    def get_by_group_name(cls, group_name, cache=False,
                          case_insensitive=False):
        if case_insensitive:
            q = cls.query().filter(cls.users_group_name.ilike(group_name))
        else:
            q = cls.query().filter(cls.users_group_name == group_name)
        if cache:
            q = q.options(FromCache(
                            "sql_cache_short",
                            "get_user_%s" % _hash_key(group_name)
                          )
            )
        return q.scalar()

    @classmethod
    def get(cls, users_group_id, cache=False):
        users_group = cls.query()
        if cache:
            users_group = users_group.options(FromCache("sql_cache_short",
                                    "get_users_group_%s" % users_group_id))
        return users_group.get(users_group_id)


class UserGroupMember(Base, BaseModel):
    __tablename__ = 'users_groups_members'
    __table_args__ = (
        {'extend_existing': True, 'mysql_engine':'InnoDB',
         'mysql_charset': 'utf8'},
    )

    users_group_member_id = Column("users_group_member_id", Integer(), nullable=False, unique=True, default=None, primary_key=True)
    users_group_id = Column("users_group_id", Integer(), ForeignKey('users_groups.users_group_id'), nullable=False, unique=None, default=None)
    user_id = Column("user_id", Integer(), ForeignKey('users.user_id'), nullable=False, unique=None, default=None)

    user = relationship('User', lazy='joined')
    users_group = relationship('UserGroup')

    def __init__(self, gr_id='', u_id=''):
        self.users_group_id = gr_id
        self.user_id = u_id


class Repository(Base, BaseModel):
    __tablename__ = 'repositories'
    __table_args__ = (
        UniqueConstraint('repo_name'),
        {'extend_existing': True, 'mysql_engine':'InnoDB',
         'mysql_charset': 'utf8'},
    )

    repo_id = Column("repo_id", Integer(), nullable=False, unique=True, default=None, primary_key=True)
    repo_name = Column("repo_name", String(length=255, convert_unicode=False, assert_unicode=None), nullable=False, unique=True, default=None)
    clone_uri = Column("clone_uri", String(length=255, convert_unicode=False, assert_unicode=None), nullable=True, unique=False, default=None)
    repo_type = Column("repo_type", String(length=255, convert_unicode=False, assert_unicode=None), nullable=False, unique=False, default='hg')
    user_id = Column("user_id", Integer(), ForeignKey('users.user_id'), nullable=False, unique=False, default=None)
    private = Column("private", Boolean(), nullable=True, unique=None, default=None)
    enable_statistics = Column("statistics", Boolean(), nullable=True, unique=None, default=True)
    enable_downloads = Column("downloads", Boolean(), nullable=True, unique=None, default=True)
    description = Column("description", String(length=10000, convert_unicode=False, assert_unicode=None), nullable=True, unique=None, default=None)
    created_on = Column('created_on', DateTime(timezone=False), nullable=True, unique=None, default=datetime.datetime.now)

    fork_id = Column("fork_id", Integer(), ForeignKey('repositories.repo_id'), nullable=True, unique=False, default=None)
    group_id = Column("group_id", Integer(), ForeignKey('groups.group_id'), nullable=True, unique=False, default=None)

    user = relationship('User')
    fork = relationship('Repository', remote_side=repo_id)
    group = relationship('RepoGroup')
    repo_to_perm = relationship('UserRepoToPerm', cascade='all', order_by='UserRepoToPerm.repo_to_perm_id')
    users_group_to_perm = relationship('UserGroupRepoToPerm', cascade='all')
    stats = relationship('Statistics', cascade='all', uselist=False)

    followers = relationship('UserFollowing', primaryjoin='UserFollowing.follows_repo_id==Repository.repo_id', cascade='all')

    logs = relationship('UserLog')

    def __unicode__(self):
        return u"<%s('%s:%s')>" % (self.__class__.__name__,self.repo_id,
                                   self.repo_name)

    @classmethod
    def url_sep(cls):
        return '/'

    @classmethod
    def get_by_repo_name(cls, repo_name):
        q = Session.query(cls).filter(cls.repo_name == repo_name)
        q = q.options(joinedload(Repository.fork))\
                .options(joinedload(Repository.user))\
                .options(joinedload(Repository.group))
        return q.scalar()

    @classmethod
    def get_repo_forks(cls, repo_id):
        return cls.query().filter(Repository.fork_id == repo_id)

    @classmethod
    def base_path(cls):
        """
        Returns base path when all repos are stored

        :param cls:
        """
        q = Session.query(Ui)\
            .filter(Ui.ui_key == cls.url_sep())
        q = q.options(FromCache("sql_cache_short", "repository_repo_path"))
        return q.one().ui_value

    @property
    def just_name(self):
        return self.repo_name.split(Repository.url_sep())[-1]

    @property
    def groups_with_parents(self):
        groups = []
        if self.group is None:
            return groups

        cur_gr = self.group
        groups.insert(0, cur_gr)
        while 1:
            gr = getattr(cur_gr, 'parent_group', None)
            cur_gr = cur_gr.parent_group
            if gr is None:
                break
            groups.insert(0, gr)

        return groups

    @property
    def groups_and_repo(self):
        return self.groups_with_parents, self.just_name

    @LazyProperty
    def repo_path(self):
        """
        Returns base full path for that repository means where it actually
        exists on a filesystem
        """
        q = Session.query(Ui).filter(Ui.ui_key ==
                                              Repository.url_sep())
        q = q.options(FromCache("sql_cache_short", "repository_repo_path"))
        return q.one().ui_value

    @property
    def repo_full_path(self):
        p = [self.repo_path]
        # we need to split the name by / since this is how we store the
        # names in the database, but that eventually needs to be converted
        # into a valid system path
        p += self.repo_name.split(Repository.url_sep())
        return os.path.join(*p)

    def get_new_name(self, repo_name):
        """
        returns new full repository name based on assigned group and new new

        :param group_name:
        """
        path_prefix = self.group.full_path_splitted if self.group else []
        return Repository.url_sep().join(path_prefix + [repo_name])

    @property
    def _ui(self):
        """
        Creates an db based ui object for this repository
        """
        from mercurial import ui
        from mercurial import config
        baseui = ui.ui()

        #clean the baseui object
        baseui._ocfg = config.config()
        baseui._ucfg = config.config()
        baseui._tcfg = config.config()

        ret = Ui.query()\
            .options(FromCache("sql_cache_short", "repository_repo_ui")).all()

        hg_ui = ret
        for ui_ in hg_ui:
            if ui_.ui_active:
                log.debug('settings ui from db: [%s] %s=%s', ui_.ui_section,
                          ui_.ui_key, ui_.ui_value)
                baseui.setconfig(ui_.ui_section, ui_.ui_key, ui_.ui_value)

        return baseui

    @classmethod
    def is_valid(cls, repo_name):
        """
        returns True if given repo name is a valid filesystem repository

        :param cls:
        :param repo_name:
        """
        from kallithea.lib.utils import is_valid_repo

        return is_valid_repo(repo_name, cls.base_path())

    #==========================================================================
    # SCM PROPERTIES
    #==========================================================================

    def get_changeset(self, rev):
        return get_changeset_safe(self.scm_instance, rev)

    @property
    def tip(self):
        return self.get_changeset('tip')

    @property
    def author(self):
        return self.tip.author

    @property
    def last_change(self):
        return self.scm_instance.last_change

    def comments(self, revisions=None):
        """
        Returns comments for this repository grouped by revisions

        :param revisions: filter query by revisions only
        """
        cmts = ChangesetComment.query()\
            .filter(ChangesetComment.repo == self)
        if revisions:
            cmts = cmts.filter(ChangesetComment.revision.in_(revisions))
        grouped = defaultdict(list)
        for cmt in cmts.all():
            grouped[cmt.revision].append(cmt)
        return grouped

    #==========================================================================
    # SCM CACHE INSTANCE
    #==========================================================================

    @property
    def invalidate(self):
        return CacheInvalidation.invalidate(self.repo_name)

    def set_invalidate(self):
        """
        set a cache for invalidation for this instance
        """
        CacheInvalidation.set_invalidate(self.repo_name)

    @LazyProperty
    def scm_instance(self):
        return self.__get_instance()

    @property
    def scm_instance_cached(self):
        @cache_region('long_term')
        def _c(repo_name):
            return self.__get_instance()
        rn = self.repo_name
        log.debug('Getting cached instance of repo')
        inv = self.invalidate
        if inv is not None:
            region_invalidate(_c, None, rn)
            # update our cache
            CacheInvalidation.set_valid(inv.cache_key)
        return _c(rn)

    def __get_instance(self):
        repo_full_path = self.repo_full_path
        try:
            alias = get_scm(repo_full_path)[0]
            log.debug('Creating instance of %s repository' % alias)
            backend = get_backend(alias)
        except VCSError:
            log.error(traceback.format_exc())
            log.error('Perhaps this repository is in db and not in '
                      'filesystem run rescan repositories with '
                      '"destroy old data " option from admin panel')
            return

        if alias == 'hg':

            repo = backend(safe_str(repo_full_path), create=False,
                           baseui=self._ui)
            # skip hidden web repository
            if repo._get_hidden():
                return
        else:
            repo = backend(repo_full_path, create=False)

        return repo


class RepoGroup(Base, BaseModel):
    __tablename__ = 'groups'
    __table_args__ = (
        UniqueConstraint('group_name', 'group_parent_id'),
        CheckConstraint('group_id != group_parent_id'),
        {'extend_existing': True, 'mysql_engine':'InnoDB',
         'mysql_charset': 'utf8'},
    )
    __mapper_args__ = {'order_by': 'group_name'}

    group_id = Column("group_id", Integer(), nullable=False, unique=True, default=None, primary_key=True)
    group_name = Column("group_name", String(length=255, convert_unicode=False, assert_unicode=None), nullable=False, unique=True, default=None)
    group_parent_id = Column("group_parent_id", Integer(), ForeignKey('groups.group_id'), nullable=True, unique=None, default=None)
    group_description = Column("group_description", String(length=10000, convert_unicode=False, assert_unicode=None), nullable=True, unique=None, default=None)

    repo_group_to_perm = relationship('UserRepoGroupToPerm', cascade='all', order_by='UserRepoGroupToPerm.group_to_perm_id')
    users_group_to_perm = relationship('UserGroupRepoGroupToPerm', cascade='all')

    parent_group = relationship('RepoGroup', remote_side=group_id)

    def __init__(self, group_name='', parent_group=None):
        self.group_name = group_name
        self.parent_group = parent_group

    def __unicode__(self):
        return u"<%s('%s:%s')>" % (self.__class__.__name__, self.group_id,
                                  self.group_name)

    @classmethod
    def groups_choices(cls):
        from webhelpers.html import literal as _literal
        repo_groups = [('', '')]
        sep = ' &raquo; '
        _name = lambda k: _literal(sep.join(k))

        repo_groups.extend([(x.group_id, _name(x.full_path_splitted))
                              for x in cls.query().all()])

        repo_groups = sorted(repo_groups, key=lambda t: t[1].split(sep)[0])
        return repo_groups

    @classmethod
    def url_sep(cls):
        return '/'

    @classmethod
    def get_by_group_name(cls, group_name, cache=False, case_insensitive=False):
        if case_insensitive:
            gr = cls.query()\
                .filter(cls.group_name.ilike(group_name))
        else:
            gr = cls.query()\
                .filter(cls.group_name == group_name)
        if cache:
            gr = gr.options(FromCache(
                            "sql_cache_short",
                            "get_group_%s" % _hash_key(group_name)
                            )
            )
        return gr.scalar()

    @property
    def parents(self):
        parents_recursion_limit = 5
        groups = []
        if self.parent_group is None:
            return groups
        cur_gr = self.parent_group
        groups.insert(0, cur_gr)
        cnt = 0
        while 1:
            cnt += 1
            gr = getattr(cur_gr, 'parent_group', None)
            cur_gr = cur_gr.parent_group
            if gr is None:
                break
            if cnt == parents_recursion_limit:
                # this will prevent accidental infinit loops
                log.error('group nested more than %s' %
                          parents_recursion_limit)
                break

            groups.insert(0, gr)
        return groups

    @property
    def children(self):
        return RepoGroup.query().filter(RepoGroup.parent_group == self)

    @property
    def name(self):
        return self.group_name.split(RepoGroup.url_sep())[-1]

    @property
    def full_path(self):
        return self.group_name

    @property
    def full_path_splitted(self):
        return self.group_name.split(RepoGroup.url_sep())

    @property
    def repositories(self):
        return Repository.query()\
                .filter(Repository.group == self)\
                .order_by(Repository.repo_name)

    @property
    def repositories_recursive_count(self):
        cnt = self.repositories.count()

        def children_count(group):
            cnt = 0
            for child in group.children:
                cnt += child.repositories.count()
                cnt += children_count(child)
            return cnt

        return cnt + children_count(self)

    def get_new_name(self, group_name):
        """
        returns new full group name based on parent and new name

        :param group_name:
        """
        path_prefix = (self.parent_group.full_path_splitted if
                       self.parent_group else [])
        return RepoGroup.url_sep().join(path_prefix + [group_name])


class Permission(Base, BaseModel):
    __tablename__ = 'permissions'
    __table_args__ = (
        {'extend_existing': True, 'mysql_engine':'InnoDB',
         'mysql_charset': 'utf8'},
    )
    permission_id = Column("permission_id", Integer(), nullable=False, unique=True, default=None, primary_key=True)
    permission_name = Column("permission_name", String(length=255, convert_unicode=False, assert_unicode=None), nullable=True, unique=None, default=None)
    permission_longname = Column("permission_longname", String(length=255, convert_unicode=False, assert_unicode=None), nullable=True, unique=None, default=None)

    def __unicode__(self):
        return u"<%s('%s:%s')>" % (
            self.__class__.__name__, self.permission_id, self.permission_name
        )

    @classmethod
    def get_by_key(cls, key):
        return cls.query().filter(cls.permission_name == key).scalar()

    @classmethod
    def get_default_perms(cls, default_user_id):
        q = Session.query(UserRepoToPerm, Repository, cls)\
         .join((Repository, UserRepoToPerm.repository_id == Repository.repo_id))\
         .join((cls, UserRepoToPerm.permission_id == cls.permission_id))\
         .filter(UserRepoToPerm.user_id == default_user_id)

        return q.all()

    @classmethod
    def get_default_group_perms(cls, default_user_id):
        q = Session.query(UserRepoGroupToPerm, RepoGroup, cls)\
         .join((RepoGroup, UserRepoGroupToPerm.group_id == RepoGroup.group_id))\
         .join((cls, UserRepoGroupToPerm.permission_id == cls.permission_id))\
         .filter(UserRepoGroupToPerm.user_id == default_user_id)

        return q.all()


class UserRepoToPerm(Base, BaseModel):
    __tablename__ = 'repo_to_perm'
    __table_args__ = (
        UniqueConstraint('user_id', 'repository_id', 'permission_id'),
        {'extend_existing': True, 'mysql_engine':'InnoDB',
         'mysql_charset': 'utf8'}
    )
    repo_to_perm_id = Column("repo_to_perm_id", Integer(), nullable=False, unique=True, default=None, primary_key=True)
    user_id = Column("user_id", Integer(), ForeignKey('users.user_id'), nullable=False, unique=None, default=None)
    permission_id = Column("permission_id", Integer(), ForeignKey('permissions.permission_id'), nullable=False, unique=None, default=None)
    repository_id = Column("repository_id", Integer(), ForeignKey('repositories.repo_id'), nullable=False, unique=None, default=None)

    user = relationship('User')
    repository = relationship('Repository')
    permission = relationship('Permission')

    @classmethod
    def create(cls, user, repository, permission):
        n = cls()
        n.user = user
        n.repository = repository
        n.permission = permission
        Session.add(n)
        return n

    def __unicode__(self):
        return u'<user:%s => %s >' % (self.user, self.repository)


class UserToPerm(Base, BaseModel):
    __tablename__ = 'user_to_perm'
    __table_args__ = (
        UniqueConstraint('user_id', 'permission_id'),
        {'extend_existing': True, 'mysql_engine':'InnoDB',
         'mysql_charset': 'utf8'}
    )
    user_to_perm_id = Column("user_to_perm_id", Integer(), nullable=False, unique=True, default=None, primary_key=True)
    user_id = Column("user_id", Integer(), ForeignKey('users.user_id'), nullable=False, unique=None, default=None)
    permission_id = Column("permission_id", Integer(), ForeignKey('permissions.permission_id'), nullable=False, unique=None, default=None)

    user = relationship('User')
    permission = relationship('Permission', lazy='joined')


class UserGroupRepoToPerm(Base, BaseModel):
    __tablename__ = 'users_group_repo_to_perm'
    __table_args__ = (
        UniqueConstraint('repository_id', 'users_group_id', 'permission_id'),
        {'extend_existing': True, 'mysql_engine':'InnoDB',
         'mysql_charset': 'utf8'}
    )
    users_group_to_perm_id = Column("users_group_to_perm_id", Integer(), nullable=False, unique=True, default=None, primary_key=True)
    users_group_id = Column("users_group_id", Integer(), ForeignKey('users_groups.users_group_id'), nullable=False, unique=None, default=None)
    permission_id = Column("permission_id", Integer(), ForeignKey('permissions.permission_id'), nullable=False, unique=None, default=None)
    repository_id = Column("repository_id", Integer(), ForeignKey('repositories.repo_id'), nullable=False, unique=None, default=None)

    users_group = relationship('UserGroup')
    permission = relationship('Permission')
    repository = relationship('Repository')

    @classmethod
    def create(cls, users_group, repository, permission):
        n = cls()
        n.users_group = users_group
        n.repository = repository
        n.permission = permission
        Session.add(n)
        return n

    def __unicode__(self):
        return u'<userGroup:%s => %s >' % (self.users_group, self.repository)


class UserGroupToPerm(Base, BaseModel):
    __tablename__ = 'users_group_to_perm'
    __table_args__ = (
        UniqueConstraint('users_group_id', 'permission_id',),
        {'extend_existing': True, 'mysql_engine':'InnoDB',
         'mysql_charset': 'utf8'}
    )
    users_group_to_perm_id = Column("users_group_to_perm_id", Integer(), nullable=False, unique=True, default=None, primary_key=True)
    users_group_id = Column("users_group_id", Integer(), ForeignKey('users_groups.users_group_id'), nullable=False, unique=None, default=None)
    permission_id = Column("permission_id", Integer(), ForeignKey('permissions.permission_id'), nullable=False, unique=None, default=None)

    users_group = relationship('UserGroup')
    permission = relationship('Permission')


class UserRepoGroupToPerm(Base, BaseModel):
    __tablename__ = 'user_repo_group_to_perm'
    __table_args__ = (
        UniqueConstraint('user_id', 'group_id', 'permission_id'),
        {'extend_existing': True, 'mysql_engine':'InnoDB',
         'mysql_charset': 'utf8'}
    )

    group_to_perm_id = Column("group_to_perm_id", Integer(), nullable=False, unique=True, default=None, primary_key=True)
    user_id = Column("user_id", Integer(), ForeignKey('users.user_id'), nullable=False, unique=None, default=None)
    group_id = Column("group_id", Integer(), ForeignKey('groups.group_id'), nullable=False, unique=None, default=None)
    permission_id = Column("permission_id", Integer(), ForeignKey('permissions.permission_id'), nullable=False, unique=None, default=None)

    user = relationship('User')
    group = relationship('RepoGroup')
    permission = relationship('Permission')


class UserGroupRepoGroupToPerm(Base, BaseModel):
    __tablename__ = 'users_group_repo_group_to_perm'
    __table_args__ = (
        UniqueConstraint('users_group_id', 'group_id'),
        {'extend_existing': True, 'mysql_engine':'InnoDB',
         'mysql_charset': 'utf8'}
    )

    users_group_repo_group_to_perm_id = Column("users_group_repo_group_to_perm_id", Integer(), nullable=False, unique=True, default=None, primary_key=True)
    users_group_id = Column("users_group_id", Integer(), ForeignKey('users_groups.users_group_id'), nullable=False, unique=None, default=None)
    group_id = Column("group_id", Integer(), ForeignKey('groups.group_id'), nullable=False, unique=None, default=None)
    permission_id = Column("permission_id", Integer(), ForeignKey('permissions.permission_id'), nullable=False, unique=None, default=None)

    users_group = relationship('UserGroup')
    permission = relationship('Permission')
    group = relationship('RepoGroup')


class Statistics(Base, BaseModel):
    __tablename__ = 'statistics'
    __table_args__ = (
         UniqueConstraint('repository_id'),
         {'extend_existing': True, 'mysql_engine':'InnoDB',
          'mysql_charset': 'utf8'}
    )
    stat_id = Column("stat_id", Integer(), nullable=False, unique=True, default=None, primary_key=True)
    repository_id = Column("repository_id", Integer(), ForeignKey('repositories.repo_id'), nullable=False, unique=True, default=None)
    stat_on_revision = Column("stat_on_revision", Integer(), nullable=False)
    commit_activity = Column("commit_activity", LargeBinary(1000000), nullable=False)#JSON data
    commit_activity_combined = Column("commit_activity_combined", LargeBinary(), nullable=False)#JSON data
    languages = Column("languages", LargeBinary(1000000), nullable=False)#JSON data

    repository = relationship('Repository', single_parent=True)


class UserFollowing(Base, BaseModel):
    __tablename__ = 'user_followings'
    __table_args__ = (
        UniqueConstraint('user_id', 'follows_repository_id'),
        UniqueConstraint('user_id', 'follows_user_id'),
        {'extend_existing': True, 'mysql_engine':'InnoDB',
         'mysql_charset': 'utf8'}
    )

    user_following_id = Column("user_following_id", Integer(), nullable=False, unique=True, default=None, primary_key=True)
    user_id = Column("user_id", Integer(), ForeignKey('users.user_id'), nullable=False, unique=None, default=None)
    follows_repo_id = Column("follows_repository_id", Integer(), ForeignKey('repositories.repo_id'), nullable=True, unique=None, default=None)
    follows_user_id = Column("follows_user_id", Integer(), ForeignKey('users.user_id'), nullable=True, unique=None, default=None)
    follows_from = Column('follows_from', DateTime(timezone=False), nullable=True, unique=None, default=datetime.datetime.now)

    user = relationship('User', primaryjoin='User.user_id==UserFollowing.user_id')

    follows_user = relationship('User', primaryjoin='User.user_id==UserFollowing.follows_user_id')
    follows_repository = relationship('Repository', order_by='Repository.repo_name')

    @classmethod
    def get_repo_followers(cls, repo_id):
        return cls.query().filter(cls.follows_repo_id == repo_id)


class CacheInvalidation(Base, BaseModel):
    __tablename__ = 'cache_invalidation'
    __table_args__ = (
        UniqueConstraint('cache_key'),
        {'extend_existing': True, 'mysql_engine':'InnoDB',
         'mysql_charset': 'utf8'},
    )
    cache_id = Column("cache_id", Integer(), nullable=False, unique=True, default=None, primary_key=True)
    cache_key = Column("cache_key", String(length=255, convert_unicode=False, assert_unicode=None), nullable=True, unique=None, default=None)
    cache_args = Column("cache_args", String(length=255, convert_unicode=False, assert_unicode=None), nullable=True, unique=None, default=None)
    cache_active = Column("cache_active", Boolean(), nullable=True, unique=None, default=False)

    def __init__(self, cache_key, cache_args=''):
        self.cache_key = cache_key
        self.cache_args = cache_args
        self.cache_active = False

    def __unicode__(self):
        return u"<%s('%s:%s')>" % (self.__class__.__name__,
                                  self.cache_id, self.cache_key)
    @classmethod
    def clear_cache(cls):
        cls.query().delete()

    @classmethod
    def _get_key(cls, key):
        """
        Wrapper for generating a key, together with a prefix

        :param key:
        """
        import kallithea
        prefix = ''
        iid = kallithea.CONFIG.get('instance_id')
        if iid:
            prefix = iid
        return "%s%s" % (prefix, key), prefix, key.rstrip('_README')

    @classmethod
    def get_by_key(cls, key):
        return cls.query().filter(cls.cache_key == key).scalar()

    @classmethod
    def _get_or_create_key(cls, key, prefix, org_key):
        inv_obj = Session.query(cls).filter(cls.cache_key == key).scalar()
        if not inv_obj:
            try:
                inv_obj = CacheInvalidation(key, org_key)
                Session.add(inv_obj)
                Session.commit()
            except Exception:
                log.error(traceback.format_exc())
                Session.rollback()
        return inv_obj

    @classmethod
    def invalidate(cls, key):
        """
        Returns Invalidation object if this given key should be invalidated
        None otherwise. `cache_active = False` means that this cache
        state is not valid and needs to be invalidated

        :param key:
        """

        key, _prefix, _org_key = cls._get_key(key)
        inv = cls._get_or_create_key(key, _prefix, _org_key)

        if inv and inv.cache_active is False:
            return inv

    @classmethod
    def set_invalidate(cls, key):
        """
        Mark this Cache key for invalidation

        :param key:
        """

        key, _prefix, _org_key = cls._get_key(key)
        inv_objs = Session.query(cls).filter(cls.cache_args == _org_key).all()
        log.debug('marking %s key[s] %s for invalidation' % (len(inv_objs),
                                                             _org_key))
        try:
            for inv_obj in inv_objs:
                if inv_obj:
                    inv_obj.cache_active = False

                Session.add(inv_obj)
            Session.commit()
        except Exception:
            log.error(traceback.format_exc())
            Session.rollback()

    @classmethod
    def set_valid(cls, key):
        """
        Mark this cache key as active and currently cached

        :param key:
        """
        inv_obj = cls.get_by_key(key)
        inv_obj.cache_active = True
        Session.add(inv_obj)
        Session.commit()


class ChangesetComment(Base, BaseModel):
    __tablename__ = 'changeset_comments'
    __table_args__ = (
        {'extend_existing': True, 'mysql_engine':'InnoDB',
         'mysql_charset': 'utf8'},
    )
    comment_id = Column('comment_id', Integer(), nullable=False, primary_key=True)
    repo_id = Column('repo_id', Integer(), ForeignKey('repositories.repo_id'), nullable=False)
    revision = Column('revision', String(40), nullable=False)
    line_no = Column('line_no', Unicode(10), nullable=True)
    f_path = Column('f_path', Unicode(1000), nullable=True)
    user_id = Column('user_id', Integer(), ForeignKey('users.user_id'), nullable=False)
    text = Column('text', Unicode(25000), nullable=False)
    modified_at = Column('modified_at', DateTime(), nullable=False, default=datetime.datetime.now)

    author = relationship('User', lazy='joined')
    repo = relationship('Repository')

    @classmethod
    def get_users(cls, revision):
        """
        Returns user associated with this changesetComment. ie those
        who actually commented

        :param cls:
        :param revision:
        """
        return Session.query(User)\
                .filter(cls.revision == revision)\
                .join(ChangesetComment.author).all()


class Notification(Base, BaseModel):
    __tablename__ = 'notifications'
    __table_args__ = (
        {'extend_existing': True, 'mysql_engine':'InnoDB',
         'mysql_charset': 'utf8'},
    )

    TYPE_CHANGESET_COMMENT = u'cs_comment'
    TYPE_MESSAGE = u'message'
    TYPE_MENTION = u'mention'
    TYPE_REGISTRATION = u'registration'

    notification_id = Column('notification_id', Integer(), nullable=False, primary_key=True)
    subject = Column('subject', Unicode(512), nullable=True)
    body = Column('body', Unicode(50000), nullable=True)
    created_by = Column("created_by", Integer(), ForeignKey('users.user_id'), nullable=True)
    created_on = Column('created_on', DateTime(timezone=False), nullable=False, default=datetime.datetime.now)
    type_ = Column('type', Unicode(256))

    created_by_user = relationship('User')
    notifications_to_users = relationship('UserNotification', lazy='joined',
                                          cascade="all, delete, delete-orphan")

    @property
    def recipients(self):
        return [x.user for x in UserNotification.query()\
                .filter(UserNotification.notification == self).all()]

    @classmethod
    def create(cls, created_by, subject, body, recipients, type_=None):
        if type_ is None:
            type_ = Notification.TYPE_MESSAGE

        notification = cls()
        notification.created_by_user = created_by
        notification.subject = subject
        notification.body = body
        notification.type_ = type_
        notification.created_on = datetime.datetime.now()

        for u in recipients:
            assoc = UserNotification()
            assoc.notification = notification
            u.notifications.append(assoc)
        Session.add(notification)
        return notification

    @property
    def description(self):
        from kallithea.model.notification import NotificationModel
        return NotificationModel().make_description(self)


class UserNotification(Base, BaseModel):
    __tablename__ = 'user_to_notification'
    __table_args__ = (
        UniqueConstraint('user_id', 'notification_id'),
        {'extend_existing': True, 'mysql_engine':'InnoDB',
         'mysql_charset': 'utf8'}
    )
    user_id = Column('user_id', Integer(), ForeignKey('users.user_id'), primary_key=True)
    notification_id = Column("notification_id", Integer(), ForeignKey('notifications.notification_id'), primary_key=True)
    read = Column('read', Boolean, default=False)
    sent_on = Column('sent_on', DateTime(timezone=False), nullable=True, unique=None)

    user = relationship('User', lazy="joined")
    notification = relationship('Notification', lazy="joined",
                                order_by=lambda: Notification.created_on.desc(),)

    def mark_as_read(self):
        self.read = True
        Session.add(self)


class DbMigrateVersion(Base, BaseModel):
    __tablename__ = 'db_migrate_version'
    __table_args__ = (
        {'extend_existing': True, 'mysql_engine':'InnoDB',
         'mysql_charset': 'utf8'},
    )
    repository_id = Column('repository_id', String(250), primary_key=True)
    repository_path = Column('repository_path', Text)
    version = Column('version', Integer)

## this is migration from 1_4_0, but now it's here to overcome a problem of
## attaching a FK to this from 1_3_0 !


class PullRequest(Base, BaseModel):
    __tablename__ = 'pull_requests'
    __table_args__ = (
        {'extend_existing': True, 'mysql_engine': 'InnoDB',
         'mysql_charset': 'utf8'},
    )

    STATUS_NEW = u'new'
    STATUS_OPEN = u'open'
    STATUS_CLOSED = u'closed'

    pull_request_id = Column('pull_request_id', Integer(), nullable=False, primary_key=True)
    title = Column('title', Unicode(256), nullable=True)
    description = Column('description', UnicodeText(10240), nullable=True)
    status = Column('status', Unicode(256), nullable=False, default=STATUS_NEW)
    created_on = Column('created_on', DateTime(timezone=False), nullable=False, default=datetime.datetime.now)
    updated_on = Column('updated_on', DateTime(timezone=False), nullable=False, default=datetime.datetime.now)
    user_id = Column("user_id", Integer(), ForeignKey('users.user_id'), nullable=False, unique=None)
    _revisions = Column('revisions', UnicodeText(20500))  # 500 revisions max
    org_repo_id = Column('org_repo_id', Integer(), ForeignKey('repositories.repo_id'), nullable=False)
    org_ref = Column('org_ref', Unicode(256), nullable=False)
    other_repo_id = Column('other_repo_id', Integer(), ForeignKey('repositories.repo_id'), nullable=False)
    other_ref = Column('other_ref', Unicode(256), nullable=False)
