# along with this program.  If not, see <http://www.gnu.org/licenses/>.

"""

kallithea.model.pull_request

~~~~~~~~~~~~~~~~~~~~~~~~~~~~

pull request model for Kallithea

This file was forked by the Kallithea project in July 2014.

Original author and date, and relevant copyright and licensing information is below:

:created_on: Jun 6, 2012

:author: marcink

:copyright: (c) 2013 RhodeCode GmbH, and others.

:license: GPLv3, see LICENSE.md for more details.

"""

import datetime

import logging

import re

from tg import request

from tg.i18n import ugettext as _

from kallithea.lib import helpers as h

from kallithea.lib.utils2 import ascii_bytes, extract_mentioned_users

from kallithea.model.db import ChangesetStatus, PullRequest, PullRequestReviewer, User

from kallithea.model.meta import Session

from kallithea.model.notification import NotificationModel

log = logging.getLogger(__name__)

def _assert_valid_reviewers(seq):

    """Sanity check: elements are actual User objects, and not the default user."""

    assert not any(user.is_default_user for user in seq)

class PullRequestModel(object):

    def add_reviewers(self, user, pr, reviewers, mention_recipients=None):

        """Add reviewer and send notification to them.

        """

        reviewers = set(reviewers)

        _assert_valid_reviewers(reviewers)

        if mention_recipients is not None:

            mention_recipients = set(mention_recipients) - reviewers

            _assert_valid_reviewers(mention_recipients)

        for reviewer in reviewers:

            prr = PullRequestReviewer(reviewer, pr)

            Session().add(prr)

        # notification to reviewers

        pr_url = pr.url(canonical=True)

        threading = ['%s-pr-%s@%s' % (pr.other_repo.repo_name,

                                      pr.pull_request_id,

                                      h.canonical_hostname())]

        subject = h.link_to(

            _('%(user)s wants you to review pull request %(pr_nice_id)s: %(pr_title)s') %

                {'user': user.username,

                 'pr_title': pr.title,

                 'pr_nice_id': pr.nice_id()},

            pr_url)

        body = pr.description

        _org_ref_type, org_ref_name, _org_rev = pr.org_ref.split(':')

        _other_ref_type, other_ref_name, _other_rev = pr.other_ref.split(':')

        revision_data = [(x.raw_id, x.message)

                         for x in map(pr.org_repo.get_changeset, pr.revisions)]

        email_kwargs = {

            'pr_title': pr.title,

            'pr_title_short': h.shorter(pr.title, 50),

            'pr_user_created': user.full_name_and_username,

            'pr_repo_url': h.canonical_url('summary_home', repo_name=pr.other_repo.repo_name),

            'pr_url': pr_url,

            'pr_revisions': revision_data,

            'repo_name': pr.other_repo.repo_name,

            'org_repo_name': pr.org_repo.repo_name,

            'pr_nice_id': pr.nice_id(),

            'pr_target_repo': h.canonical_url('summary_home',

                               repo_name=pr.other_repo.repo_name),

            'pr_target_branch': other_ref_name,

            'pr_source_repo': h.canonical_url('summary_home',

                               repo_name=pr.org_repo.repo_name),

            'pr_source_branch': org_ref_name,

            'pr_owner': pr.owner,

            'pr_owner_username': pr.owner.username,

            'pr_username': user.username,

            'threading': threading,

            'is_mention': False,

            }

        if reviewers:

            NotificationModel().create(created_by=user, subject=subject, body=body,

                                       recipients=reviewers,

                                       type_=NotificationModel.TYPE_PULL_REQUEST,

                                       email_kwargs=email_kwargs)

        if mention_recipients:

            email_kwargs['is_mention'] = True

            subject = _('[Mention]') + ' ' + subject

            # FIXME: this subject is wrong and unused!

            NotificationModel().create(created_by=user, subject=subject, body=body,

                                       recipients=mention_recipients,

                                       type_=NotificationModel.TYPE_PULL_REQUEST,

                                       email_kwargs=email_kwargs)

    def mention_from_description(self, user, pr, old_description=''):

        mention_recipients = (extract_mentioned_users(pr.description) -

                              extract_mentioned_users(old_description))

        log.debug("Mentioning %s", mention_recipients)

        self.add_reviewers(user, pr, set(), mention_recipients)

    def remove_reviewers(self, user, pull_request, reviewers):

        """Remove specified users from being reviewers of the PR."""

        if not reviewers:

            return # avoid SQLAlchemy warning about empty sequence for IN-predicate

        PullRequestReviewer.query() \

            .filter_by(pull_request=pull_request) \

            .filter(PullRequestReviewer.user_id.in_(r.user_id for r in reviewers)) \

            .delete(synchronize_session='fetch') # the default of 'evaluate' is not available

    def delete(self, pull_request):

        pull_request = PullRequest.guess_instance(pull_request)

        Session().delete(pull_request)

        if pull_request.org_repo.scm_instance.alias == 'git':

            # remove a ref under refs/pull/ so that commits can be garbage-collected

            try:

                del pull_request.org_repo.scm_instance._repo[b"refs/pull/%d/head" % pull_request.pull_request_id]

            except KeyError:

                pass

    def close_pull_request(self, pull_request):

        pull_request = PullRequest.guess_instance(pull_request)

        pull_request.status = PullRequest.STATUS_CLOSED

        pull_request.updated_on = datetime.datetime.now()

class CreatePullRequestAction(object):

    class ValidationError(Exception):

        pass

    class Empty(ValidationError):

        pass

    class AmbiguousAncestor(ValidationError):

        pass

    class Unauthorized(ValidationError):

        pass

    @staticmethod