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

    changeset controller for pylons showoing changes beetween
    revisions

    :created_on: Apr 25, 2010
    :author: marcink
    :copyright: (C) 2009-2011 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

from pylons import tmpl_context as c, url, request, response
from pylons.i18n.translation import _
from pylons.controllers.util import redirect
from pylons.decorators import jsonify

import rhodecode.lib.helpers as h
from rhodecode.lib.auth import LoginRequired, HasRepoPermissionAnyDecorator
from rhodecode.lib.base import BaseRepoController, render
from rhodecode.lib.utils import EmptyChangeset
from rhodecode.lib.compat import OrderedDict
from rhodecode.model.db import ChangesetComment
from rhodecode.model.comment import ChangesetCommentsModel

from vcs.exceptions import RepositoryError, ChangesetError, \
    ChangesetDoesNotExistError
from vcs.nodes import FileNode
from vcs.utils import diffs as differ
from webob.exc import HTTPForbidden

log = logging.getLogger(__name__)


class ChangesetController(BaseRepoController):

    @LoginRequired()
    @HasRepoPermissionAnyDecorator('repository.read', 'repository.write',
                                   'repository.admin')
    def __before__(self):
        super(ChangesetController, self).__before__()
        c.affected_files_cut_off = 60

    def index(self, revision):

        def wrap_to_table(str):

            return '''<table class="code-difftable">
                        <tr class="line">
                        <td class="lineno new"></td>
                        <td class="code"><pre>%s</pre></td>
                        </tr>
                      </table>''' % str

        #get ranges of revisions if preset
        rev_range = revision.split('...')[:2]

        try:
            if len(rev_range) == 2:
                rev_start = rev_range[0]
                rev_end = rev_range[1]
                rev_ranges = c.rhodecode_repo.get_changesets(start=rev_start,
                                                            end=rev_end)
            else:
                rev_ranges = [c.rhodecode_repo.get_changeset(revision)]

            c.cs_ranges = list(rev_ranges)
            if not c.cs_ranges:
                raise RepositoryError('Changeset range returned empty result')

        except (RepositoryError, ChangesetDoesNotExistError, Exception), e:
            log.error(traceback.format_exc())
            h.flash(str(e), category='warning')
            return redirect(url('home'))

        c.changes = OrderedDict()
        c.sum_added = 0
        c.sum_removed = 0
        c.lines_added = 0
        c.lines_deleted = 0
        c.cut_off = False  # defines if cut off limit is reached

        c.comments = []
        c.inline_comments = []
        c.inline_cnt = 0
        # Iterate over ranges (default changeset view is always one changeset)
        for changeset in c.cs_ranges:
            c.comments.extend(ChangesetCommentsModel()\
                              .get_comments(c.rhodecode_db_repo.repo_id,
                                            changeset.raw_id))
            inlines = ChangesetCommentsModel()\
                        .get_inline_comments(c.rhodecode_db_repo.repo_id,
                                             changeset.raw_id)
            c.inline_comments.extend(inlines)
            c.changes[changeset.raw_id] = []
            try:
                changeset_parent = changeset.parents[0]
            except IndexError:
                changeset_parent = None

            #==================================================================
            # ADDED FILES
            #==================================================================
            for node in changeset.added:

                filenode_old = FileNode(node.path, '', EmptyChangeset())
                if filenode_old.is_binary or node.is_binary:
                    diff = wrap_to_table(_('binary file'))
                    st = (0, 0)
                else:
                    # in this case node.size is good parameter since those are
                    # added nodes and their size defines how many changes were
                    # made
                    c.sum_added += node.size
                    if c.sum_added < self.cut_off_limit:
                        f_gitdiff = differ.get_gitdiff(filenode_old, node)
                        d = differ.DiffProcessor(f_gitdiff, format='gitdiff')

                        st = d.stat()
                        diff = d.as_html()

                    else:
                        diff = wrap_to_table(_('Changeset is to big and '
                                               'was cut off, see raw '
                                               'changeset instead'))
                        c.cut_off = True
                        break

                cs1 = None
                cs2 = node.last_changeset.raw_id
                c.lines_added += st[0]
                c.lines_deleted += st[1]
                c.changes[changeset.raw_id].append(('added', node, diff,
                                                    cs1, cs2, st))

            #==================================================================
            # CHANGED FILES
            #==================================================================
            if not c.cut_off:
                for node in changeset.changed:
                    try:
                        filenode_old = changeset_parent.get_node(node.path)
                    except ChangesetError:
                        log.warning('Unable to fetch parent node for diff')
                        filenode_old = FileNode(node.path, '',
                                                EmptyChangeset())

                    if filenode_old.is_binary or node.is_binary:
                        diff = wrap_to_table(_('binary file'))
                        st = (0, 0)
                    else:

                        if c.sum_removed < self.cut_off_limit:
                            f_gitdiff = differ.get_gitdiff(filenode_old, node)
                            d = differ.DiffProcessor(f_gitdiff,
                                                     format='gitdiff')
                            st = d.stat()
                            if (st[0] + st[1]) * 256 > self.cut_off_limit:
                                diff = wrap_to_table(_('Diff is to big '
                                                       'and was cut off, see '
                                                       'raw diff instead'))
                            else:
                                diff = d.as_html()

                            if diff:
                                c.sum_removed += len(diff)
                        else:
                            diff = wrap_to_table(_('Changeset is to big and '
                                                   'was cut off, see raw '
                                                   'changeset instead'))
                            c.cut_off = True
                            break

                    cs1 = filenode_old.last_changeset.raw_id
                    cs2 = node.last_changeset.raw_id
                    c.lines_added += st[0]
                    c.lines_deleted += st[1]
                    c.changes[changeset.raw_id].append(('changed', node, diff,
                                                        cs1, cs2, st))

            #==================================================================
            # REMOVED FILES
            #==================================================================
            if not c.cut_off:
                for node in changeset.removed:
                    c.changes[changeset.raw_id].append(('removed', node, None,
                                                        None, None, (0, 0)))

        # count inline comments
        for path, lines in c.inline_comments:
            for comments in lines.values():
                c.inline_cnt += len(comments)

        if len(c.cs_ranges) == 1:
            c.changeset = c.cs_ranges[0]
            c.changes = c.changes[c.changeset.raw_id]

            return render('changeset/changeset.html')
        else:
            return render('changeset/changeset_range.html')

    def raw_changeset(self, revision):

        method = request.GET.get('diff', 'show')
        try:
            c.scm_type = c.rhodecode_repo.alias
            c.changeset = c.rhodecode_repo.get_changeset(revision)
        except RepositoryError:
            log.error(traceback.format_exc())
            return redirect(url('home'))
        else:
            try:
                c.changeset_parent = c.changeset.parents[0]
            except IndexError:
                c.changeset_parent = None
            c.changes = []

            for node in c.changeset.added:
                filenode_old = FileNode(node.path, '')
                if filenode_old.is_binary or node.is_binary:
                    diff = _('binary file') + '\n'
                else:
                    f_gitdiff = differ.get_gitdiff(filenode_old, node)
                    diff = differ.DiffProcessor(f_gitdiff,
                                                format='gitdiff').raw_diff()

                cs1 = None
                cs2 = node.last_changeset.raw_id
                c.changes.append(('added', node, diff, cs1, cs2))

            for node in c.changeset.changed:
                filenode_old = c.changeset_parent.get_node(node.path)
                if filenode_old.is_binary or node.is_binary:
                    diff = _('binary file')
                else:
                    f_gitdiff = differ.get_gitdiff(filenode_old, node)
                    diff = differ.DiffProcessor(f_gitdiff,
                                                format='gitdiff').raw_diff()

                cs1 = filenode_old.last_changeset.raw_id
                cs2 = node.last_changeset.raw_id
                c.changes.append(('changed', node, diff, cs1, cs2))

        response.content_type = 'text/plain'

        if method == 'download':
            response.content_disposition = 'attachment; filename=%s.patch' \
                                            % revision

        c.parent_tmpl = ''.join(['# Parent  %s\n' % x.raw_id for x in
                                                 c.changeset.parents])

        c.diffs = ''
        for x in c.changes:
            c.diffs += x[2]

        return render('changeset/raw_changeset.html')

    def comment(self, repo_name, revision):
        ChangesetCommentsModel().create(text=request.POST.get('text'),
                                        repo_id=c.rhodecode_db_repo.repo_id,
                                        user_id=c.rhodecode_user.user_id,
                                        revision=revision,
                                        f_path=request.POST.get('f_path'),
                                        line_no=request.POST.get('line'))

        return redirect(h.url('changeset_home', repo_name=repo_name,
                              revision=revision))

    @jsonify
    def delete_comment(self, comment_id):
        co = ChangesetComment.get(comment_id)
        owner = lambda : co.author.user_id == c.rhodecode_user.user_id
        if h.HasPermissionAny('hg.admin', 'repository.admin')() or owner:
            ccmodel = ChangesetCommentsModel()
            ccmodel.delete(comment_id=comment_id)
            return True
        else:
            raise HTTPForbidden()