# -*- coding: utf-8 -*-
"""
    rhodecode.controllers.changelog
    ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

    changelog controller for rhodecode
    
    :created_on: Apr 21, 2010
    :author: marcink
    :copyright: (C) 2009-2010 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

try:
    import json
except ImportError:
    #python 2.5 compatibility
    import simplejson as json

from mercurial.graphmod import colored, CHANGESET, revisions as graph_rev
from pylons import request, session, tmpl_context as c

from rhodecode.lib.auth import LoginRequired, HasRepoPermissionAnyDecorator
from rhodecode.lib.base import BaseController, render
from rhodecode.model.scm import ScmModel

from webhelpers.paginate import Page

log = logging.getLogger(__name__)

class ChangelogController(BaseController):

    @LoginRequired()
    @HasRepoPermissionAnyDecorator('repository.read', 'repository.write',
                                   'repository.admin')
    def __before__(self):
        super(ChangelogController, self).__before__()

    def index(self):
        limit = 100
        default = 20
        if request.params.get('size'):
            try:
                int_size = int(request.params.get('size'))
            except ValueError:
                int_size = default
            int_size = int_size if int_size <= limit else limit
            c.size = int_size
            session['changelog_size'] = c.size
            session.save()
        else:
            c.size = int(session.get('changelog_size', default))

        changesets = ScmModel().get_repo(c.repo_name)

        p = int(request.params.get('page', 1))
        c.total_cs = len(changesets)
        c.pagination = Page(changesets, page=p, item_count=c.total_cs,
                            items_per_page=c.size)

        self._graph(changesets, c.size, p)

        return render('changelog/changelog.html')


    def _graph(self, repo, size, p):
        revcount = size
        if not repo.revisions or repo.alias == 'git':
            c.jsdata = json.dumps([])
            return

        max_rev = repo.revisions[-1]

        offset = 1 if p == 1 else  ((p - 1) * revcount + 1)

        rev_start = repo.revisions[(-1 * offset)]

        revcount = min(max_rev, revcount)
        rev_end = max(0, rev_start - revcount)
        dag = graph_rev(repo.repo, rev_start, rev_end)

        c.dag = tree = list(colored(dag))
        data = []
        for (id, type, ctx, vtx, edges) in tree:
            if type != CHANGESET:
                continue
            data.append(('', vtx, edges))

        c.jsdata = json.dumps(data)