# -*- 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.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 logging

import datetime

from pylons.i18n.translation import _

from kallithea.model.meta import Session

from kallithea.lib import helpers as h

from kallithea.model import BaseModel

from kallithea.model.db import PullRequest, PullRequestReviewers, Notification,\

    ChangesetStatus, User

from kallithea.model.notification import NotificationModel

from kallithea.lib.utils2 import extract_mentioned_users, safe_unicode

log = logging.getLogger(__name__)

class PullRequestModel(BaseModel):

    cls = PullRequest

    def __get_pull_request(self, pull_request):

        return self._get_instance(PullRequest, pull_request)

    def get_pullrequest_cnt_for_user(self, user):

        return PullRequest.query()\

                                .join(PullRequestReviewers)\

                                .filter(PullRequestReviewers.user_id == user)\

                                .filter(PullRequest.status != PullRequest.STATUS_CLOSED)\

                                .count()

    def get_all(self, repo_name, from_=False, closed=False):

        """Get all PRs for repo.

        Default is all PRs to the repo, PRs from the repo if from_.

        Closed PRs are only included if closed is true."""

        repo = self._get_repo(repo_name)

        q = PullRequest.query()

        if from_:

            q = q.filter(PullRequest.org_repo == repo)

        else:

            q = q.filter(PullRequest.other_repo == repo)

        if not closed:

            q = q.filter(PullRequest.status != PullRequest.STATUS_CLOSED)

        return q.order_by(PullRequest.created_on.desc()).all()

    def create(self, created_by, org_repo, org_ref, other_repo, other_ref,

               revisions, reviewers, title, description=None):

        from kallithea.model.changeset_status import ChangesetStatusModel

        created_by_user = self._get_user(created_by)

        org_repo = self._get_repo(org_repo)

        other_repo = self._get_repo(other_repo)

        new = PullRequest()

        new.org_repo = org_repo

        new.org_ref = org_ref

        new.other_repo = other_repo

        new.other_ref = other_ref

        new.revisions = revisions

        new.title = title

        new.description = description

        new.author = created_by_user

        Session().add(new)

        Session().flush()

        #reset state to under-review

        from kallithea.model.comment import ChangesetCommentsModel

        comment = ChangesetCommentsModel().create(

            repo=org_repo,

            user=new.author,

            pull_request=new,

            send_email=False

        )

        ChangesetStatusModel().set_status(

            org_repo,

            ChangesetStatus.STATUS_UNDER_REVIEW,

            new.author,

            comment,

            pull_request=new

        )

        mention_recipients = set(User.get_by_username(username, case_insensitive=True)

                                 for username in extract_mentioned_users(new.description))

        self.__add_reviewers(new, reviewers, mention_recipients)

        return new

    def __add_reviewers(self, pr, reviewers, mention_recipients=None):

        #members

        for member in set(reviewers):

            _usr = self._get_user(member)

            reviewer = PullRequestReviewers(_usr, pr)

            Session().add(reviewer)

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

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

        #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 = safe_unicode(

            h.link_to(

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

                {'user': pr.author.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(':')

        email_kwargs = {

            'pr_title': pr.title,

            'pr_user_created': h.person(pr.author),

            '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,

            'pr_nice_id': pr.nice_id(),

            'ref': org_ref_name,

            'pr_username': pr.author.username,

            'threading': threading,

            'is_mention': False,

            }

        if reviewers:

            NotificationModel().create(created_by=pr.author, subject=subject, body=body,

                                       recipients=reviewers,

                                       type_=Notification.TYPE_PULL_REQUEST,

                                       email_kwargs=email_kwargs)

        if mention_recipients:

            mention_recipients.discard(None)

            mention_recipients.difference_update(reviewers)

        if mention_recipients:

            email_kwargs['is_mention'] = True

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

            NotificationModel().create(created_by=pr.author, subject=subject, body=body,

                                       recipients=mention_recipients,

                                       type_=Notification.TYPE_PULL_REQUEST,

                                       email_kwargs=email_kwargs)

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

        mention_recipients = set(User.get_by_username(username, case_insensitive=True)

                                 for username in extract_mentioned_users(pr.description))

        mention_recipients.difference_update(User.get_by_username(username, case_insensitive=True)

                                             for username in extract_mentioned_users(old_description))

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

        self.__add_reviewers(pr, [], mention_recipients)

    def update_reviewers(self, pull_request, reviewers_ids):

        reviewers_ids = set(reviewers_ids)

        pull_request = self.__get_pull_request(pull_request)

        current_reviewers = PullRequestReviewers.query()\

                            .filter(PullRequestReviewers.pull_request==

                                   pull_request)\

                            .all()

        current_reviewers_ids = set([x.user.user_id for x in current_reviewers])

        to_add = reviewers_ids.difference(current_reviewers_ids)

        to_remove = current_reviewers_ids.difference(reviewers_ids)