# -*- coding: utf-8 -*-
"""
    rhodecode.model.db
    ~~~~~~~~~~~~~~~~~~

    Database Models for RhodeCode

    :created_on: Apr 08, 2010
    :author: marcink
    :copyright: (C) 2009-2011 Marcin Kuzminski <marcin@python-works.com>
    :license: GPLv3, see COPYING for more details.
"""
# 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/>.

import os
import logging
import datetime
import traceback
from datetime import date

from sqlalchemy import *
from sqlalchemy.exc import DatabaseError
from sqlalchemy.ext.hybrid import hybrid_property
from sqlalchemy.orm import relationship, backref, joinedload, class_mapper, \
    validates
from sqlalchemy.orm.interfaces import MapperExtension
from beaker.cache import cache_region, region_invalidate

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

from rhodecode.lib import str2bool, safe_str, get_changeset_safe, \
    generate_api_key, safe_unicode
from rhodecode.lib.exceptions import UsersGroupsAssignedException
from rhodecode.lib.compat import json

from rhodecode.model.meta import Base, Session
from rhodecode.model.caching_query import FromCache


log = logging.getLogger( __name__ )

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

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 )
        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_ ):
        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 )
        Session.commit()


class RhodeCodeSettings( Base, BaseModel ):
    __tablename__ = 'rhodecode_settings'
    __table_args__ = ( UniqueConstraint( 'app_settings_name' ), {'extend_existing':True} )
    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 v == '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 __repr__( self ):
        return "<%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['rhodecode_' + 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 RhodeCodeUi( Base, BaseModel ):
    __tablename__ = 'rhodecode_ui'
    __table_args__ = ( UniqueConstraint( 'ui_key' ), {'extend_existing':True} )

    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 )
        Session.commit()


class User( Base, BaseModel ):
    __tablename__ = 'users'
    __table_args__ = ( UniqueConstraint( 'username' ), UniqueConstraint( 'email' ), {'extend_existing':True} )
    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( 'RepoToPerm', primaryjoin = 'RepoToPerm.user_id==User.user_id', cascade = 'all' )

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

    @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 __repr__( self ):
        try:
            return "<%s('id:%s:%s')>" % ( self.__class__.__name__,
                                             self.user_id, self.username )
        except:
            return self.__class__.__name__

    @classmethod
    def get_by_username( cls, username, case_insensitive = False ):
        if case_insensitive:
            return Session.query( cls ).filter( cls.username.ilike( username ) ).scalar()
        else:
            return Session.query( cls ).filter( cls.username == username ).scalar()

    @classmethod
    def get_by_api_key( cls, api_key ):
        return cls.query().filter( cls.api_key == api_key ).one()

    def update_lastlogin( self ):
        """Update user lastlogin"""

        self.last_login = datetime.datetime.now()
        Session.add( self )
        Session.commit()
        log.debug( 'updated user %s lastlogin', self.username )

    @classmethod
    def create( cls, form_data ):
        from rhodecode.lib.auth import get_crypt_password

        try:
            new_user = cls()
            for k, v in form_data.items():
                if k == 'password':
                    v = get_crypt_password( v )
                setattr( new_user, k, v )

            new_user.api_key = generate_api_key( form_data['username'] )
            Session.add( new_user )
            Session.commit()
            return new_user
        except:
            log.error( traceback.format_exc() )
            Session.rollback()
            raise

class UserLog( Base, BaseModel ):
    __tablename__ = 'user_logs'
    __table_args__ = {'extend_existing':True}
    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 = False, unique = None, default = None )
    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 date( *self.action_date.timetuple()[:3] )

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


class UsersGroup( Base, BaseModel ):
    __tablename__ = 'users_groups'
    __table_args__ = {'extend_existing':True}

    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( 'UsersGroupMember', cascade = "all, delete, delete-orphan", lazy = "joined" )

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

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

    @classmethod
    def create( cls, form_data ):
        try:
            new_users_group = cls()
            for k, v in form_data.items():
                setattr( new_users_group, k, v )

            Session.add( new_users_group )
            Session.commit()
            return new_users_group
        except:
            log.error( traceback.format_exc() )
            Session.rollback()
            raise

    @classmethod
    def update( cls, users_group_id, form_data ):

        try:
            users_group = cls.get( users_group_id, cache = False )

            for k, v in form_data.items():
                if k == 'users_group_members':
                    users_group.members = []
                    Session.flush()
                    members_list = []
                    if v:
                        for u_id in set( list( v ) ):
                            member = UsersGroupMember( users_group_id, u_id )
                            members_list.append( member )
                    setattr( users_group, 'members', members_list )
                setattr( users_group, k, v )

            Session.add( users_group )
            Session.commit()
        except:
            log.error( traceback.format_exc() )
            Session.rollback()
            raise

    @classmethod
    def delete( cls, users_group_id ):
        try:

            # check if this group is not assigned to repo
            assigned_groups = UsersGroupRepoToPerm.query()\
                .filter( UsersGroupRepoToPerm.users_group_id ==
                        users_group_id ).all()

            if assigned_groups:
                raise UsersGroupsAssignedException( 'Group assigned to %s' %
                                                   assigned_groups )

            users_group = cls.get( users_group_id, cache = False )
            Session.delete( users_group )
            Session.commit()
        except:
            log.error( traceback.format_exc() )
            Session.rollback()
            raise

class UsersGroupMember( Base, BaseModel ):
    __tablename__ = 'users_groups_members'
    __table_args__ = {'extend_existing':True}

    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( 'UsersGroup' )

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

    @staticmethod
    def add_user_to_group( group, user ):
        ugm = UsersGroupMember()
        ugm.users_group = group
        ugm.user = user
        Session.add( ugm )
        Session.commit()
        return ugm

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

    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( 'Group' )
    repo_to_perm = relationship( 'RepoToPerm', cascade = 'all', order_by = 'RepoToPerm.repo_to_perm_id' )
    users_group_to_perm = relationship( 'UsersGroupRepoToPerm', 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', cascade = 'all' )

    def __repr__( self ):
        return "<%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.one()

    @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( RhodeCodeUi ).filter( RhodeCodeUi.ui_key ==
                                              cls.url_sep() )
        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( RhodeCodeUi ).filter( RhodeCodeUi.ui_key ==
                                              Repository.url_sep() )
        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 = RhodeCodeUi.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 rhodecode.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

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

    @property
    def invalidate( self ):
        """
        Returns Invalidation object if this repo should be invalidated
        None otherwise. `cache_active = False` means that this cache
        state is not valid and needs to be invalidated
        """
        return CacheInvalidation.query()\
            .filter( CacheInvalidation.cache_key == self.repo_name )\
            .filter( CacheInvalidation.cache_active == False )\
            .scalar()

    def set_invalidate( self ):
        """
        set a cache for invalidation for this instance
        """
        inv = CacheInvalidation.query()\
            .filter( CacheInvalidation.cache_key == self.repo_name )\
            .scalar()

        if inv is None:
            inv = CacheInvalidation( self.repo_name )
        inv.cache_active = True
        Session.add( inv )
        Session.commit()

    @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()

        # TODO: remove this trick when beaker 1.6 is released
        # and have fixed this issue with not supporting unicode keys
        rn = safe_str( self.repo_name )

        inv = self.invalidate
        if inv is not None:
            region_invalidate( _c, None, rn )
            # update our cache
            inv.cache_active = True
            Session.add( inv )
            Session.commit()

        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 Group( Base, BaseModel ):
    __tablename__ = 'groups'
    __table_args__ = ( UniqueConstraint( 'group_name', 'group_parent_id' ),
                      CheckConstraint( 'group_id != group_parent_id' ), {'extend_existing':True}, )
    __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 )

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


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

    def __repr__( self ):
        return "<%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" % 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 Group.query().filter( Group.parent_group == self )

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

    @property
    def full_path( self ):
        return Group.url_sep().join( [g.group_name for g in self.parents] +
                        [self.group_name] )

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

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

    @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 Group.url_sep().join( path_prefix + [group_name] )


class Permission( Base, BaseModel ):
    __tablename__ = 'permissions'
    __table_args__ = {'extend_existing':True}
    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 __repr__( self ):
        return "<%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()

class RepoToPerm( Base, BaseModel ):
    __tablename__ = 'repo_to_perm'
    __table_args__ = ( UniqueConstraint( 'user_id', 'repository_id' ), {'extend_existing':True} )
    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' )
    permission = relationship( 'Permission' )
    repository = relationship( 'Repository' )

class UserToPerm( Base, BaseModel ):
    __tablename__ = 'user_to_perm'
    __table_args__ = ( UniqueConstraint( 'user_id', 'permission_id' ), {'extend_existing':True} )
    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' )

    @classmethod
    def has_perm( cls, user_id, perm ):
        if not isinstance( perm, Permission ):
            raise Exception( 'perm needs to be an instance of Permission class' )

        return cls.query().filter( cls.user_id == user_id )\
            .filter( cls.permission == perm ).scalar() is not None

    @classmethod
    def grant_perm( cls, user_id, perm ):
        if not isinstance( perm, Permission ):
            raise Exception( 'perm needs to be an instance of Permission class' )

        new = cls()
        new.user_id = user_id
        new.permission = perm
        try:
            Session.add( new )
            Session.commit()
        except:
            Session.rollback()


    @classmethod
    def revoke_perm( cls, user_id, perm ):
        if not isinstance( perm, Permission ):
            raise Exception( 'perm needs to be an instance of Permission class' )

        try:
            cls.query().filter( cls.user_id == user_id )\
                .filter( cls.permission == perm ).delete()
            Session.commit()
        except:
            Session.rollback()

class UsersGroupRepoToPerm( Base, BaseModel ):
    __tablename__ = 'users_group_repo_to_perm'
    __table_args__ = ( UniqueConstraint( 'repository_id', 'users_group_id', 'permission_id' ), {'extend_existing':True} )
    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( 'UsersGroup' )
    permission = relationship( 'Permission' )
    repository = relationship( 'Repository' )

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

class UsersGroupToPerm( Base, BaseModel ):
    __tablename__ = 'users_group_to_perm'
    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( 'UsersGroup' )
    permission = relationship( 'Permission' )


    @classmethod
    def has_perm( cls, users_group_id, perm ):
        if not isinstance( perm, Permission ):
            raise Exception( 'perm needs to be an instance of Permission class' )

        return cls.query().filter( cls.users_group_id ==
                                         users_group_id )\
                                         .filter( cls.permission == perm )\
                                         .scalar() is not None

    @classmethod
    def grant_perm( cls, users_group_id, perm ):
        if not isinstance( perm, Permission ):
            raise Exception( 'perm needs to be an instance of Permission class' )

        new = cls()
        new.users_group_id = users_group_id
        new.permission = perm
        try:
            Session.add( new )
            Session.commit()
        except:
            Session.rollback()


    @classmethod
    def revoke_perm( cls, users_group_id, perm ):
        if not isinstance( perm, Permission ):
            raise Exception( 'perm needs to be an instance of Permission class' )

        try:
            cls.query().filter( cls.users_group_id == users_group_id )\
                .filter( cls.permission == perm ).delete()
            Session.commit()
        except:
            Session.rollback()


class GroupToPerm( Base, BaseModel ):
    __tablename__ = 'group_to_perm'
    __table_args__ = ( UniqueConstraint( 'group_id', 'permission_id' ), {'extend_existing':True} )

    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 )
    permission_id = Column( "permission_id", Integer(), ForeignKey( 'permissions.permission_id' ), nullable = False, unique = None, default = None )
    group_id = Column( "group_id", Integer(), ForeignKey( 'groups.group_id' ), nullable = False, unique = None, default = None )

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

class Statistics( Base, BaseModel ):
    __tablename__ = 'statistics'
    __table_args__ = ( UniqueConstraint( 'repository_id' ), {'extend_existing':True} )
    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} )

    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} )
    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 __repr__( self ):
        return "<%s('%s:%s')>" % ( self.__class__.__name__,
                                  self.cache_id, self.cache_key )

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