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

    users model for RhodeCode

    :created_on: Apr 9, 2010
    :author: marcink
    :copyright: (C) 2010-2012 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 logging
import traceback
import itertools
from pylons import url
from pylons.i18n.translation import _

from sqlalchemy.exc import DatabaseError
from sqlalchemy.orm import joinedload

from rhodecode.lib.utils2 import safe_unicode, generate_api_key
from rhodecode.lib.caching_query import FromCache
from rhodecode.model import BaseModel
from rhodecode.model.db import User, UserRepoToPerm, Repository, Permission, \
    UserToPerm, UsersGroupRepoToPerm, UsersGroupToPerm, UsersGroupMember, \
    Notification, RepoGroup, UserRepoGroupToPerm, UsersGroupRepoGroupToPerm, \
    UserEmailMap
from rhodecode.lib.exceptions import DefaultUserException, \
    UserOwnsReposException


log = logging.getLogger(__name__)

PERM_WEIGHTS = Permission.PERM_WEIGHTS


class UserModel(BaseModel):
    cls = User

    def get(self, user_id, cache=False):
        user = self.sa.query(User)
        if cache:
            user = user.options(FromCache("sql_cache_short",
                                          "get_user_%s" % user_id))
        return user.get(user_id)

    def get_user(self, user):
        return self._get_user(user)

    def get_by_username(self, username, cache=False, case_insensitive=False):

        if case_insensitive:
            user = self.sa.query(User).filter(User.username.ilike(username))
        else:
            user = self.sa.query(User)\
                .filter(User.username == username)
        if cache:
            user = user.options(FromCache("sql_cache_short",
                                          "get_user_%s" % username))
        return user.scalar()

    def get_by_email(self, email, cache=False, case_insensitive=False):
        return User.get_by_email(email, case_insensitive, cache)

    def get_by_api_key(self, api_key, cache=False):
        return User.get_by_api_key(api_key, cache)

    def create(self, form_data):
        from rhodecode.lib.auth import get_crypt_password
        try:
            new_user = User()
            for k, v in form_data.items():
                if k == 'password':
                    v = get_crypt_password(v)
                if k == 'firstname':
                    k = 'name'
                setattr(new_user, k, v)

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

    def create_or_update(self, username, password, email, firstname='',
                         lastname='', active=True, admin=False, ldap_dn=None):
        """
        Creates a new instance if not found, or updates current one

        :param username:
        :param password:
        :param email:
        :param active:
        :param firstname:
        :param lastname:
        :param active:
        :param admin:
        :param ldap_dn:
        """

        from rhodecode.lib.auth import get_crypt_password

        log.debug('Checking for %s account in RhodeCode database' % username)
        user = User.get_by_username(username, case_insensitive=True)
        if user is None:
            log.debug('creating new user %s' % username)
            new_user = User()
            edit = False
        else:
            log.debug('updating user %s' % username)
            new_user = user
            edit = True

        try:
            new_user.username = username
            new_user.admin = admin
            # set password only if creating an user or password is changed
            if edit is False or user.password != password:
                new_user.password = get_crypt_password(password)
                new_user.api_key = generate_api_key(username)
            new_user.email = email
            new_user.active = active
            new_user.ldap_dn = safe_unicode(ldap_dn) if ldap_dn else None
            new_user.name = firstname
            new_user.lastname = lastname
            self.sa.add(new_user)
            return new_user
        except (DatabaseError,):
            log.error(traceback.format_exc())
            raise

    def create_for_container_auth(self, username, attrs):
        """
        Creates the given user if it's not already in the database

        :param username:
        :param attrs:
        """
        if self.get_by_username(username, case_insensitive=True) is None:

            # autogenerate email for container account without one
            generate_email = lambda usr: '%s@container_auth.account' % usr

            try:
                new_user = User()
                new_user.username = username
                new_user.password = None
                new_user.api_key = generate_api_key(username)
                new_user.email = attrs['email']
                new_user.active = attrs.get('active', True)
                new_user.name = attrs['name'] or generate_email(username)
                new_user.lastname = attrs['lastname']

                self.sa.add(new_user)
                return new_user
            except (DatabaseError,):
                log.error(traceback.format_exc())
                self.sa.rollback()
                raise
        log.debug('User %s already exists. Skipping creation of account'
                  ' for container auth.', username)
        return None

    def create_ldap(self, username, password, user_dn, attrs):
        """
        Checks if user is in database, if not creates this user marked
        as ldap user

        :param username:
        :param password:
        :param user_dn:
        :param attrs:
        """
        from rhodecode.lib.auth import get_crypt_password
        log.debug('Checking for such ldap account in RhodeCode database')
        if self.get_by_username(username, case_insensitive=True) is None:

            # autogenerate email for ldap account without one
            generate_email = lambda usr: '%s@ldap.account' % usr

            try:
                new_user = User()
                username = username.lower()
                # add ldap account always lowercase
                new_user.username = username
                new_user.password = get_crypt_password(password)
                new_user.api_key = generate_api_key(username)
                new_user.email = attrs['email'] or generate_email(username)
                new_user.active = attrs.get('active', True)
                new_user.ldap_dn = safe_unicode(user_dn)
                new_user.name = attrs['name']
                new_user.lastname = attrs['lastname']

                self.sa.add(new_user)
                return new_user
            except (DatabaseError,):
                log.error(traceback.format_exc())
                self.sa.rollback()
                raise
        log.debug('this %s user exists skipping creation of ldap account',
                  username)
        return None

    def create_registration(self, form_data):
        from rhodecode.model.notification import NotificationModel

        try:
            form_data['admin'] = False
            new_user = self.create(form_data)

            self.sa.add(new_user)
            self.sa.flush()

            # notification to admins
            subject = _('new user registration')
            body = ('New user registration\n'
                    '---------------------\n'
                    '- Username: %s\n'
                    '- Full Name: %s\n'
                    '- Email: %s\n')
            body = body % (new_user.username, new_user.full_name,
                           new_user.email)
            edit_url = url('edit_user', id=new_user.user_id, qualified=True)
            kw = {'registered_user_url': edit_url}
            NotificationModel().create(created_by=new_user, subject=subject,
                                       body=body, recipients=None,
                                       type_=Notification.TYPE_REGISTRATION,
                                       email_kwargs=kw)

        except:
            log.error(traceback.format_exc())
            raise

    def update(self, user_id, form_data):
        from rhodecode.lib.auth import get_crypt_password
        try:
            user = self.get(user_id, cache=False)
            if user.username == 'default':
                raise DefaultUserException(
                                _("You can't Edit this user since it's"
                                  " crucial for entire application"))

            for k, v in form_data.items():
                if k == 'new_password' and v:
                    user.password = get_crypt_password(v)
                    user.api_key = generate_api_key(user.username)
                else:
                    if k == 'firstname':
                        k = 'name'
                    setattr(user, k, v)
            self.sa.add(user)
        except:
            log.error(traceback.format_exc())
            raise

    def update_user(self, user, **kwargs):
        from rhodecode.lib.auth import get_crypt_password
        try:
            user = self._get_user(user)
            if user.username == 'default':
                raise DefaultUserException(
                    _("You can't Edit this user since it's"
                      " crucial for entire application")
                )

            for k, v in kwargs.items():
                if k == 'password' and v:
                    v = get_crypt_password(v)
                    user.api_key = generate_api_key(user.username)

                setattr(user, k, v)
            self.sa.add(user)
            return user
        except:
            log.error(traceback.format_exc())
            raise

    def update_my_account(self, user_id, form_data):
        from rhodecode.lib.auth import get_crypt_password
        try:
            user = self.get(user_id, cache=False)
            if user.username == 'default':
                raise DefaultUserException(
                    _("You can't Edit this user since it's"
                      " crucial for entire application")
                )
            for k, v in form_data.items():
                if k == 'new_password' and v:
                    user.password = get_crypt_password(v)
                    user.api_key = generate_api_key(user.username)
                else:
                    if k == 'firstname':
                        k = 'name'
                    if k not in ['admin', 'active']:
                        setattr(user, k, v)

            self.sa.add(user)
        except:
            log.error(traceback.format_exc())
            raise

    def delete(self, user):
        user = self._get_user(user)

        try:
            if user.username == 'default':
                raise DefaultUserException(
                    _(u"You can't remove this user since it's"
                      " crucial for entire application")
                )
            if user.repositories:
                repos = [x.repo_name for x in user.repositories]
                raise UserOwnsReposException(
                    _(u'user "%s" still owns %s repositories and cannot be '
                      'removed. Switch owners or remove those repositories. %s')
                    % (user.username, len(repos), ', '.join(repos))
                )
            self.sa.delete(user)
        except:
            log.error(traceback.format_exc())
            raise

    def reset_password_link(self, data):
        from rhodecode.lib.celerylib import tasks, run_task
        run_task(tasks.send_password_link, data['email'])

    def reset_password(self, data):
        from rhodecode.lib.celerylib import tasks, run_task
        run_task(tasks.reset_user_password, data['email'])

    def fill_data(self, auth_user, user_id=None, api_key=None):
        """
        Fetches auth_user by user_id,or api_key if present.
        Fills auth_user attributes with those taken from database.
        Additionally set's is_authenitated if lookup fails
        present in database

        :param auth_user: instance of user to set attributes
        :param user_id: user id to fetch by
        :param api_key: api key to fetch by
        """
        if user_id is None and api_key is None:
            raise Exception('You need to pass user_id or api_key')

        try:
            if api_key:
                dbuser = self.get_by_api_key(api_key)
            else:
                dbuser = self.get(user_id)

            if dbuser is not None and dbuser.active:
                log.debug('filling %s data' % dbuser)
                for k, v in dbuser.get_dict().items():
                    setattr(auth_user, k, v)
            else:
                return False

        except:
            log.error(traceback.format_exc())
            auth_user.is_authenticated = False
            return False

        return True

    def fill_perms(self, user):
        """
        Fills user permission attribute with permissions taken from database
        works for permissions given for repositories, and for permissions that
        are granted to groups

        :param user: user instance to fill his perms
        """
        RK = 'repositories'
        GK = 'repositories_groups'
        GLOBAL = 'global'
        user.permissions[RK] = {}
        user.permissions[GK] = {}
        user.permissions[GLOBAL] = set()

        #======================================================================
        # fetch default permissions
        #======================================================================
        default_user = User.get_by_username('default', cache=True)
        default_user_id = default_user.user_id

        default_repo_perms = Permission.get_default_perms(default_user_id)
        default_repo_groups_perms = Permission.get_default_group_perms(default_user_id)

        if user.is_admin:
            #==================================================================
            # admin user have all default rights for repositories
            # and groups set to admin
            #==================================================================
            user.permissions[GLOBAL].add('hg.admin')

            # repositories
            for perm in default_repo_perms:
                r_k = perm.UserRepoToPerm.repository.repo_name
                p = 'repository.admin'
                user.permissions[RK][r_k] = p

            # repositories groups
            for perm in default_repo_groups_perms:
                rg_k = perm.UserRepoGroupToPerm.group.group_name
                p = 'group.admin'
                user.permissions[GK][rg_k] = p
            return user

        #==================================================================
        # SET DEFAULTS GLOBAL, REPOS, REPOS GROUPS
        #==================================================================
        uid = user.user_id

        # default global permissions taken fron the default user
        default_global_perms = self.sa.query(UserToPerm)\
            .filter(UserToPerm.user_id == default_user_id)

        for perm in default_global_perms:
            user.permissions[GLOBAL].add(perm.permission.permission_name)

        # defaults for repositories, taken from default user
        for perm in default_repo_perms:
            r_k = perm.UserRepoToPerm.repository.repo_name
            if perm.Repository.private and not (perm.Repository.user_id == uid):
                # disable defaults for private repos,
                p = 'repository.none'
            elif perm.Repository.user_id == uid:
                # set admin if owner
                p = 'repository.admin'
            else:
                p = perm.Permission.permission_name

            user.permissions[RK][r_k] = p

        # defaults for repositories groups taken from default user permission
        # on given group
        for perm in default_repo_groups_perms:
            rg_k = perm.UserRepoGroupToPerm.group.group_name
            p = perm.Permission.permission_name
            user.permissions[GK][rg_k] = p

        #======================================================================
        # !! OVERRIDE GLOBALS !! with user permissions if any found
        #======================================================================
        # those can be configured from groups or users explicitly
        _configurable = set(['hg.fork.none', 'hg.fork.repository',
                             'hg.create.none', 'hg.create.repository'])

        # USER GROUPS comes first
        # users group global permissions
        user_perms_from_users_groups = self.sa.query(UsersGroupToPerm)\
            .options(joinedload(UsersGroupToPerm.permission))\
            .join((UsersGroupMember, UsersGroupToPerm.users_group_id ==
                   UsersGroupMember.users_group_id))\
            .filter(UsersGroupMember.user_id == uid)\
            .order_by(UsersGroupToPerm.users_group_id)\
            .all()
        #need to group here by groups since user can be in more than one group
        _grouped = [[x, list(y)] for x, y in
                    itertools.groupby(user_perms_from_users_groups,
                                      lambda x:x.users_group)]
        for gr, perms in _grouped:
            # since user can be in multiple groups iterate over them and
            # select the lowest permissions first (more explicit)
            ##TODO: do this^^
            if not gr.inherit_default_permissions:
                # NEED TO IGNORE all configurable permissions and
                # replace them with explicitly set
                user.permissions[GLOBAL] = user.permissions[GLOBAL]\
                                                .difference(_configurable)
            for perm in perms:
                user.permissions[GLOBAL].add(perm.permission.permission_name)

        # user specific global permissions
        user_perms = self.sa.query(UserToPerm)\
                .options(joinedload(UserToPerm.permission))\
                .filter(UserToPerm.user_id == uid).all()

        if not user.inherit_default_permissions:
            # NEED TO IGNORE all configurable permissions and
            # replace them with explicitly set
            user.permissions[GLOBAL] = user.permissions[GLOBAL]\
                                            .difference(_configurable)

            for perm in user_perms:
                user.permissions[GLOBAL].add(perm.permission.permission_name)

        #======================================================================
        # !! REPO PERMISSIONS !!
        #======================================================================
        #======================================================================
        # check if user is part of user groups for this repository and
        # fill in (or NOT replace with higher `or 1` permissions
        #======================================================================
        # users group for repositories permissions
        user_repo_perms_from_users_groups = \
         self.sa.query(UsersGroupRepoToPerm, Permission, Repository,)\
            .join((Repository, UsersGroupRepoToPerm.repository_id ==
                   Repository.repo_id))\
            .join((Permission, UsersGroupRepoToPerm.permission_id ==
                   Permission.permission_id))\
            .join((UsersGroupMember, UsersGroupRepoToPerm.users_group_id ==
                   UsersGroupMember.users_group_id))\
            .filter(UsersGroupMember.user_id == uid)\
            .all()

        for perm in user_repo_perms_from_users_groups:
            r_k = perm.UsersGroupRepoToPerm.repository.repo_name
            p = perm.Permission.permission_name
            cur_perm = user.permissions[RK][r_k]
            # overwrite permission only if it's greater than permission
            # given from other sources
            if PERM_WEIGHTS[p] > PERM_WEIGHTS[cur_perm] or 1:  # disable check
                user.permissions[RK][r_k] = p

        # user explicit permissions for repositories
        user_repo_perms = \
         self.sa.query(UserRepoToPerm, Permission, Repository)\
            .join((Repository, UserRepoToPerm.repository_id ==
                   Repository.repo_id))\
            .join((Permission, UserRepoToPerm.permission_id ==
                   Permission.permission_id))\
            .filter(UserRepoToPerm.user_id == uid)\
            .all()

        for perm in user_repo_perms:
            # set admin if owner
            r_k = perm.UserRepoToPerm.repository.repo_name
            if perm.Repository.user_id == uid:
                p = 'repository.admin'
            else:
                p = perm.Permission.permission_name
            user.permissions[RK][r_k] = p

        # REPO GROUP
        #==================================================================
        # get access for this user for repos group and override defaults
        #==================================================================

        # user explicit permissions for repository
        user_repo_groups_perms = \
         self.sa.query(UserRepoGroupToPerm, Permission, RepoGroup)\
         .join((RepoGroup, UserRepoGroupToPerm.group_id == RepoGroup.group_id))\
         .join((Permission, UserRepoGroupToPerm.permission_id == Permission.permission_id))\
         .filter(UserRepoGroupToPerm.user_id == uid)\
         .all()

        for perm in user_repo_groups_perms:
            rg_k = perm.UserRepoGroupToPerm.group.group_name
            p = perm.Permission.permission_name
            cur_perm = user.permissions[GK][rg_k]
            if PERM_WEIGHTS[p] > PERM_WEIGHTS[cur_perm]:
                user.permissions[GK][rg_k] = p

        # REPO GROUP + USER GROUP
        #==================================================================
        # check if user is part of user groups for this repo group and
        # fill in (or replace with higher) permissions
        #==================================================================

        # users group for repositories permissions
        user_repo_group_perms_from_users_groups = \
         self.sa.query(UsersGroupRepoGroupToPerm, Permission, RepoGroup)\
         .join((RepoGroup, UsersGroupRepoGroupToPerm.group_id == RepoGroup.group_id))\
         .join((Permission, UsersGroupRepoGroupToPerm.permission_id == Permission.permission_id))\
         .join((UsersGroupMember, UsersGroupRepoGroupToPerm.users_group_id == UsersGroupMember.users_group_id))\
         .filter(UsersGroupMember.user_id == uid)\
         .all()

        for perm in user_repo_group_perms_from_users_groups:
            g_k = perm.UsersGroupRepoGroupToPerm.group.group_name
            p = perm.Permission.permission_name
            cur_perm = user.permissions[GK][g_k]
            # overwrite permission only if it's greater than permission
            # given from other sources
            if PERM_WEIGHTS[p] > PERM_WEIGHTS[cur_perm]:
                user.permissions[GK][g_k] = p

        return user

    def has_perm(self, user, perm):
        perm = self._get_perm(perm)
        user = self._get_user(user)

        return UserToPerm.query().filter(UserToPerm.user == user)\
            .filter(UserToPerm.permission == perm).scalar() is not None

    def grant_perm(self, user, perm):
        """
        Grant user global permissions

        :param user:
        :param perm:
        """
        user = self._get_user(user)
        perm = self._get_perm(perm)
        # if this permission is already granted skip it
        _perm = UserToPerm.query()\
            .filter(UserToPerm.user == user)\
            .filter(UserToPerm.permission == perm)\
            .scalar()
        if _perm:
            return
        new = UserToPerm()
        new.user = user
        new.permission = perm
        self.sa.add(new)

    def revoke_perm(self, user, perm):
        """
        Revoke users global permissions

        :param user:
        :param perm:
        """
        user = self._get_user(user)
        perm = self._get_perm(perm)

        obj = UserToPerm.query()\
                .filter(UserToPerm.user == user)\
                .filter(UserToPerm.permission == perm)\
                .scalar()
        if obj:
            self.sa.delete(obj)

    def add_extra_email(self, user, email):
        """
        Adds email address to UserEmailMap

        :param user:
        :param email:
        """
        from rhodecode.model import forms
        form = forms.UserExtraEmailForm()()
        data = form.to_python(dict(email=email))
        user = self._get_user(user)

        obj = UserEmailMap()
        obj.user = user
        obj.email = data['email']
        self.sa.add(obj)
        return obj

    def delete_extra_email(self, user, email_id):
        """
        Removes email address from UserEmailMap

        :param user:
        :param email_id:
        """
        user = self._get_user(user)
        obj = UserEmailMap.query().get(email_id)
        if obj:
            self.sa.delete(obj)