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

    Files controller for RhodeCode
    
    :created_on: Apr 21, 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; 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.
import tempfile
import logging
import rhodecode.lib.helpers as h

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.scm import ScmModel

from vcs.exceptions import RepositoryError, ChangesetError, ChangesetDoesNotExistError
from vcs.nodes import FileNode
from vcs.utils import diffs as differ

log = logging.getLogger(__name__)

class FilesController(BaseController):

    @LoginRequired()
    @HasRepoPermissionAnyDecorator('repository.read', 'repository.write',
                                   'repository.admin')
    def __before__(self):
        super(FilesController, self).__before__()
        c.cut_off_limit = self.cut_off_limit

    def index(self, repo_name, revision, f_path):
        hg_model = ScmModel()
        c.repo = hg_model.get_repo(c.repo_name)

        try:
            #reditect to given revision from form
            post_revision = request.POST.get('at_rev', None)
            if post_revision:
                post_revision = c.repo.get_changeset(post_revision).raw_id
                redirect(url('files_home', repo_name=c.repo_name,
                             revision=post_revision, f_path=f_path))

            c.branch = request.GET.get('branch', None)

            c.f_path = f_path

            c.changeset = c.repo.get_changeset(revision)
            cur_rev = c.changeset.revision

            #prev link
            try:
                prev_rev = c.repo.get_changeset(cur_rev).prev(c.branch).raw_id
                c.url_prev = url('files_home', repo_name=c.repo_name,
                             revision=prev_rev, f_path=f_path)
                if c.branch:
                    c.url_prev += '?branch=%s' % c.branch
            except ChangesetDoesNotExistError:
                c.url_prev = '#'

            #next link
            try:
                next_rev = c.repo.get_changeset(cur_rev).next(c.branch).raw_id
                c.url_next = url('files_home', repo_name=c.repo_name,
                         revision=next_rev, f_path=f_path)
                if c.branch:
                    c.url_next += '?branch=%s' % c.branch
            except ChangesetDoesNotExistError:
                c.url_next = '#'

            #files
            try:
                c.files_list = c.changeset.get_node(f_path)
                c.file_history = self._get_history(c.repo, c.files_list, f_path)
            except RepositoryError, e:
                h.flash(str(e), category='warning')
                redirect(h.url('files_home', repo_name=repo_name, revision=revision))

        except RepositoryError, e:
            h.flash(str(e), category='warning')
            redirect(h.url('files_home', repo_name=repo_name, revision='tip'))



        return render('files/files.html')

    def rawfile(self, repo_name, revision, f_path):
        hg_model = ScmModel()
        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 = ScmModel()
        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 = ScmModel()
        c.repo = hg_model.get_repo(c.repo_name)

        try:
            c.cs = c.repo.get_changeset(revision)
            c.file = c.cs.get_node(f_path)
        except RepositoryError, e:
            h.flash(str(e), category='warning')
            redirect(h.url('files_home', repo_name=repo_name, revision=revision))

        c.file_history = self._get_history(c.repo, c.file, f_path)

        c.f_path = f_path

        return render('files/files_annotate.html')

    def archivefile(self, repo_name, fname):
        info = fname.split('.')
        revision, fileformat = info[0], '.' + '.'.join(info[1:])
        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

        repo = ScmModel().get_repo(repo_name)

        try:
            repo.get_changeset(revision)
        except ChangesetDoesNotExistError:
            return _('Unknown revision %s') % revision

        archive = tempfile.TemporaryFile()
        localrepo = repo.repo
        fname = '%s-%s%s' % (repo_name, revision, fileformat)
        archival.archive(localrepo, 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)

        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

        return read_in_chunks(archive)

    def diff(self, repo_name, f_path):
        hg_model = ScmModel()
        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':
            response.content_type = 'text/plain'
            return diff.raw_diff()

        elif c.action == 'diff':
            if node1.size > self.cut_off_limit or node2.size > self.cut_off_limit:
                c.cur_diff = _('Diff is to big to display')
            else:
                c.cur_diff = diff.as_html()
        else:
            #default option
            if node1.size > self.cut_off_limit or node2.size > self.cut_off_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 = []

        changesets_group = ([], _("Changesets"))
        branches_group = ([], _("Branches"))
        tags_group = ([], _("Tags"))

        for chs in changesets:
            n_desc = 'r%s:%s' % (chs.revision, chs.short_id)
            changesets_group[0].append((chs.raw_id, n_desc,))

        hist_l.append(changesets_group)

        for name, chs in c.repository_branches.items():
            #chs = chs.split(':')[-1]
            branches_group[0].append((chs, name),)
        hist_l.append(branches_group)

        for name, chs in c.repository_tags.items():
            #chs = chs.split(':')[-1]
            tags_group[0].append((chs, name),)
        hist_l.append(tags_group)

        return hist_l