#!/usr/bin/env python
# encoding: utf-8
# files controller for pylons
# Copyright (C) 2009-2010 Marcin Kuzminski <marcin@python-works.com>

# 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; version 2
# of the License or (at your opinion) any later version of the license.
# 
# 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, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
# MA  02110-1301, USA.
"""
Created on April 21, 2010
files controller for pylons
@author: marcink
"""
from mercurial import archival
from pylons import request, response, session, tmpl_context as c, url
from pylons.i18n.translation import _
from pylons.controllers.util import redirect
from rhodecode.lib.auth import LoginRequired, HasRepoPermissionAnyDecorator
from rhodecode.lib.base import BaseController, render
from rhodecode.lib.utils import EmptyChangeset
from rhodecode.model.hg import HgModel
from vcs.exceptions import RepositoryError, ChangesetError
from vcs.nodes import FileNode
from vcs.utils import diffs as differ
import logging
import rhodecode.lib.helpers as h
import tempfile

log = logging.getLogger(__name__)

class FilesController(BaseController):

    @LoginRequired()
    @HasRepoPermissionAnyDecorator('repository.read', 'repository.write',
                                   'repository.admin')
    def __before__(self):
        super(FilesController, self).__before__()
        c.file_size_limit = 250 * 1024 #limit of file size to display

    def index(self, repo_name, revision, f_path):
        hg_model = HgModel()
        c.repo = repo = hg_model.get_repo(c.repo_name)
        revision = request.POST.get('at_rev', None) or revision

        def get_next_rev(cur):
            max_rev = len(c.repo.revisions) - 1
            r = cur + 1
            if r > max_rev:
                r = max_rev
            return r

        def get_prev_rev(cur):
            r = cur - 1
            return r

        c.f_path = f_path


        try:
            cur_rev = repo.get_changeset(revision).revision
            prev_rev = repo.get_changeset(get_prev_rev(cur_rev)).raw_id
            next_rev = repo.get_changeset(get_next_rev(cur_rev)).raw_id

            c.url_prev = url('files_home', repo_name=c.repo_name,
                             revision=prev_rev, f_path=f_path)
            c.url_next = url('files_home', repo_name=c.repo_name,
                             revision=next_rev, f_path=f_path)

            c.changeset = repo.get_changeset(revision)

            c.cur_rev = c.changeset.raw_id
            c.rev_nr = c.changeset.revision
            c.files_list = c.changeset.get_node(f_path)
            c.file_history = self._get_history(repo, c.files_list, f_path)

        except (RepositoryError, ChangesetError):
            c.files_list = None

        return render('files/files.html')

    def rawfile(self, repo_name, revision, f_path):
        hg_model = HgModel()
        c.repo = hg_model.get_repo(c.repo_name)
        file_node = c.repo.get_changeset(revision).get_node(f_path)
        response.content_type = file_node.mimetype
        response.content_disposition = 'attachment; filename=%s' \
                                                    % f_path.split('/')[-1]
        return file_node.content

    def raw(self, repo_name, revision, f_path):
        hg_model = HgModel()
        c.repo = hg_model.get_repo(c.repo_name)
        file_node = c.repo.get_changeset(revision).get_node(f_path)
        response.content_type = 'text/plain'

        return file_node.content

    def annotate(self, repo_name, revision, f_path):
        hg_model = HgModel()
        c.repo = hg_model.get_repo(c.repo_name)
        cs = c.repo.get_changeset(revision)
        c.file = cs.get_node(f_path)
        c.file_msg = cs.get_file_message(f_path)
        c.cur_rev = cs.raw_id
        c.rev_nr = cs.revision
        c.f_path = f_path

        return render('files/files_annotate.html')

    def archivefile(self, repo_name, revision, fileformat):
        archive_specs = {
          '.tar.bz2': ('application/x-tar', 'tbz2'),
          '.tar.gz': ('application/x-tar', 'tgz'),
          '.zip': ('application/zip', 'zip'),
        }
        if not archive_specs.has_key(fileformat):
            return 'Unknown archive type %s' % fileformat

        def read_in_chunks(file_object, chunk_size=1024 * 40):
            """Lazy function (generator) to read a file piece by piece.
            Default chunk size: 40k."""
            while True:
                data = file_object.read(chunk_size)
                if not data:
                    break
                yield data

        archive = tempfile.TemporaryFile()
        repo = HgModel().get_repo(repo_name).repo
        fname = '%s-%s%s' % (repo_name, revision, fileformat)
        archival.archive(repo, archive, revision, archive_specs[fileformat][1],
                         prefix='%s-%s' % (repo_name, revision))
        response.content_type = archive_specs[fileformat][0]
        response.content_disposition = 'attachment; filename=%s' % fname
        archive.seek(0)
        return read_in_chunks(archive)

    def diff(self, repo_name, f_path):
        hg_model = HgModel()
        diff1 = request.GET.get('diff1')
        diff2 = request.GET.get('diff2')
        c.action = request.GET.get('diff')
        c.no_changes = diff1 == diff2
        c.f_path = f_path
        c.repo = hg_model.get_repo(c.repo_name)

        try:
            if diff1 not in ['', None, 'None', '0' * 12, '0' * 40]:
                c.changeset_1 = c.repo.get_changeset(diff1)
                node1 = c.changeset_1.get_node(f_path)
            else:
                c.changeset_1 = EmptyChangeset()
                node1 = FileNode('.', '', changeset=c.changeset_1)

            if diff2 not in ['', None, 'None', '0' * 12, '0' * 40]:
                c.changeset_2 = c.repo.get_changeset(diff2)
                node2 = c.changeset_2.get_node(f_path)
            else:
                c.changeset_2 = EmptyChangeset()
                node2 = FileNode('.', '', changeset=c.changeset_2)
        except RepositoryError:
            return redirect(url('files_home',
                                repo_name=c.repo_name, f_path=f_path))

        f_udiff = differ.get_udiff(node1, node2)
        diff = differ.DiffProcessor(f_udiff)

        if c.action == 'download':
            diff_name = '%s_vs_%s.diff' % (diff1, diff2)
            response.content_type = 'text/plain'
            response.content_disposition = 'attachment; filename=%s' \
                                                    % diff_name
            return diff.raw_diff()

        elif c.action == 'raw':
            c.cur_diff = '<pre class="raw">%s</pre>' % h.escape(diff.raw_diff())
        elif c.action == 'diff':
            if node1.size > c.file_size_limit or node2.size > c.file_size_limit:
                c.cur_diff = _('Diff is to big to display')
            else:
                c.cur_diff = diff.as_html()
        else:
            #default option
            if node1.size > c.file_size_limit or node2.size > c.file_size_limit:
                c.cur_diff = _('Diff is to big to display')
            else:
                c.cur_diff = diff.as_html()

        if not c.cur_diff: c.no_changes = True
        return render('files/file_diff.html')

    def _get_history(self, repo, node, f_path):
        from vcs.nodes import NodeKind
        if not node.kind is NodeKind.FILE:
            return []
        changesets = node.history
        hist_l = []
        for chs in changesets:
            n_desc = 'r%s:%s' % (chs.revision, chs.short_id)
            hist_l.append((chs.raw_id, n_desc,))
        return hist_l