# -*- 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.controllers.forks
~~~~~~~~~~~~~~~~~~~~~~~~~~~

forks controller for rhodecode

:created_on: Apr 23, 2011
:author: marcink
:copyright: (c) 2013 RhodeCode GmbH.
:license: GPLv3, see LICENSE.md for more details.
"""

import logging
import formencode
import traceback
from formencode import htmlfill

from pylons import tmpl_context as c, request, url
from pylons.controllers.util import redirect
from pylons.i18n.translation import _
from webob.exc import HTTPNotFound, HTTPInternalServerError

import kallithea.lib.helpers as h

from kallithea.lib.helpers import Page
from kallithea.lib.auth import LoginRequired, HasRepoPermissionAnyDecorator, \
    NotAnonymous, HasRepoPermissionAny, HasPermissionAnyDecorator
from kallithea.lib.base import BaseRepoController, render
from kallithea.model.db import Repository, RepoGroup, UserFollowing, User,\
    Ui
from kallithea.model.repo import RepoModel
from kallithea.model.forms import RepoForkForm
from kallithea.model.scm import ScmModel, RepoGroupList
from kallithea.lib.utils2 import safe_int
from kallithea.lib.utils import jsonify

log = logging.getLogger(__name__)


class ForksController(BaseRepoController):

    def __before__(self):
        super(ForksController, self).__before__()

    def __load_defaults(self):
        acl_groups = RepoGroupList(RepoGroup.query().all(),
                               perm_set=['group.write', 'group.admin'])
        c.repo_groups = RepoGroup.groups_choices(groups=acl_groups)
        c.repo_groups_choices = map(lambda k: unicode(k[0]), c.repo_groups)
        choices, c.landing_revs = ScmModel().get_repo_landing_revs()
        c.landing_revs_choices = choices
        c.can_update = Ui.get_by_key(Ui.HOOK_UPDATE).ui_active

    def __load_data(self, repo_name=None):
        """
        Load defaults settings for edit, and update

        :param repo_name:
        """
        self.__load_defaults()

        c.repo_info = db_repo = Repository.get_by_repo_name(repo_name)
        repo = db_repo.scm_instance

        if c.repo_info is None:
            h.not_mapped_error(repo_name)
            return redirect(url('repos'))

        c.default_user_id = User.get_default_user().user_id
        c.in_public_journal = UserFollowing.query()\
            .filter(UserFollowing.user_id == c.default_user_id)\
            .filter(UserFollowing.follows_repository == c.repo_info).scalar()

        if c.repo_info.stats:
            last_rev = c.repo_info.stats.stat_on_revision+1
        else:
            last_rev = 0
        c.stats_revision = last_rev

        c.repo_last_rev = repo.count() if repo.revisions else 0

        if last_rev == 0 or c.repo_last_rev == 0:
            c.stats_percentage = 0
        else:
            c.stats_percentage = '%.2f' % ((float((last_rev)) /
                                            c.repo_last_rev) * 100)

        defaults = RepoModel()._get_defaults(repo_name)
        # alter the description to indicate a fork
        defaults['description'] = ('fork of repository: %s \n%s'
                                   % (defaults['repo_name'],
                                      defaults['description']))
        # add suffix to fork
        defaults['repo_name'] = '%s-fork' % defaults['repo_name']

        return defaults

    @LoginRequired()
    @HasRepoPermissionAnyDecorator('repository.read', 'repository.write',
                                   'repository.admin')
    def forks(self, repo_name):
        p = safe_int(request.GET.get('page', 1), 1)
        repo_id = c.db_repo.repo_id
        d = []
        for r in Repository.get_repo_forks(repo_id):
            if not HasRepoPermissionAny(
                'repository.read', 'repository.write', 'repository.admin'
            )(r.repo_name, 'get forks check'):
                continue
            d.append(r)
        c.forks_pager = Page(d, page=p, items_per_page=20)

        c.forks_data = render('/forks/forks_data.html')

        if request.environ.get('HTTP_X_PARTIAL_XHR'):
            return c.forks_data

        return render('/forks/forks.html')

    @LoginRequired()
    @NotAnonymous()
    @HasPermissionAnyDecorator('hg.admin', 'hg.fork.repository')
    @HasRepoPermissionAnyDecorator('repository.read', 'repository.write',
                                   'repository.admin')
    def fork(self, repo_name):
        c.repo_info = Repository.get_by_repo_name(repo_name)
        if not c.repo_info:
            h.not_mapped_error(repo_name)
            return redirect(url('home'))

        defaults = self.__load_data(repo_name)

        return htmlfill.render(
            render('forks/fork.html'),
            defaults=defaults,
            encoding="UTF-8",
            force_defaults=False
        )

    @LoginRequired()
    @NotAnonymous()
    @HasPermissionAnyDecorator('hg.admin', 'hg.fork.repository')
    @HasRepoPermissionAnyDecorator('repository.read', 'repository.write',
                                   'repository.admin')
    def fork_create(self, repo_name):
        self.__load_defaults()
        c.repo_info = Repository.get_by_repo_name(repo_name)
        _form = RepoForkForm(old_data={'repo_type': c.repo_info.repo_type},
                             repo_groups=c.repo_groups_choices,
                             landing_revs=c.landing_revs_choices)()
        form_result = {}
        task_id = None
        try:
            form_result = _form.to_python(dict(request.POST))

            # an approximation that is better than nothing
            if not Ui.get_by_key(Ui.HOOK_UPDATE).ui_active:
                form_result['update_after_clone'] = False

            # create fork is done sometimes async on celery, db transaction
            # management is handled there.
            task = RepoModel().create_fork(form_result, self.authuser.user_id)
            from celery.result import BaseAsyncResult
            if isinstance(task, BaseAsyncResult):
                task_id = task.task_id
        except formencode.Invalid, errors:
            c.new_repo = errors.value['repo_name']
            return htmlfill.render(
                render('forks/fork.html'),
                defaults=errors.value,
                errors=errors.error_dict or {},
                prefix_error=False,
                encoding="UTF-8")
        except Exception:
            log.error(traceback.format_exc())
            h.flash(_('An error occurred during repository forking %s') %
                    repo_name, category='error')

        return redirect(h.url('repo_creating_home',
                              repo_name=form_result['repo_name_full'],
                              task_id=task_id))