# Copyright (C) 2005-2009 Aaron Bentley and Panometrics, Inc.
#                         Ben Finney <benf@cybersource.com.au>
#                         Gianluca Montecchi <gian@grys.it>
#                         Marien Zwart <marienz@gentoo.org>
#                         W. Trevor King <wking@drexel.edu>
#
# 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 2 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, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.

"""
Bazaar (bzr) backend.
"""

import os
import os.path
import re
import shutil

import libbe
import base

if libbe.TESTING == True:
    import doctest
    import sys
    import unittest


def new():
    return Bzr()

class Bzr(base.VCS):
    name = 'bzr'
    client = 'bzr'

    def __init__(self, *args, **kwargs):
        base.VCS.__init__(self, *args, **kwargs)
        self.versioned = True

    def _vcs_version(self):
        status,output,error = self._u_invoke_client('--version')
        return output        

    def _vcs_get_user_id(self):
        status,output,error = self._u_invoke_client('whoami')
        return output.rstrip('\n')

    def _vcs_detect(self, path):
        if self._u_search_parent_directories(path, '.bzr') != None :
            return True
        return False

    def _vcs_root(self, path):
        """Find the root of the deepest repository containing path."""
        status,output,error = self._u_invoke_client('root', path)
        return output.rstrip('\n')

    def _vcs_init(self, path):
        self._u_invoke_client('init', cwd=path)

    def _vcs_destroy(self):
        vcs_dir = os.path.join(self.repo, '.bzr')
        if os.path.exists(vcs_dir):
            shutil.rmtree(vcs_dir)

    def _vcs_add(self, path):
        self._u_invoke_client('add', path)

    def _vcs_remove(self, path):
        # --force to also remove unversioned files.
        self._u_invoke_client('remove', '--force', path)

    def _vcs_update(self, path):
        pass

    def _vcs_get_file_contents(self, path, revision=None):
        if revision == None:
            return base.VCS._vcs_get_file_contents(self, path, revision)
        else:
            status,output,error = \
                self._u_invoke_client('cat', '-r', revision,path)
            return output

    def _vcs_commit(self, commitfile, allow_empty=False):
        args = ['commit', '--file', commitfile]
        if allow_empty == True:
            args.append('--unchanged')
            status,output,error = self._u_invoke_client(*args)
        else:
            kwargs = {'expect':(0,3)}
            status,output,error = self._u_invoke_client(*args, **kwargs)
            if status != 0:
                strings = ['ERROR: no changes to commit.', # bzr 1.3.1
                           'ERROR: No changes to commit.'] # bzr 1.15.1
                if self._u_any_in_string(strings, error) == True:
                    raise base.EmptyCommit()
                else:
                    raise base.CommandError(args, status, stderr=error)
        revision = None
        revline = re.compile('Committed revision (.*)[.]')
        match = revline.search(error)
        assert match != None, output+error
        assert len(match.groups()) == 1
        revision = match.groups()[0]
        return revision

    def _vcs_revision_id(self, index):
        status,output,error = self._u_invoke_client('revno')
        current_revision = int(output)
        if index >= current_revision or index < -current_revision:
            return None
        if index >= 0:
            return str(index+1) # bzr commit 0 is the empty tree.
        return str(current_revision+index+1)

    
if libbe.TESTING == True:
    base.make_vcs_testcase_subclasses(Bzr, sys.modules[__name__])

    unitsuite =unittest.TestLoader().loadTestsFromModule(sys.modules[__name__])
    suite = unittest.TestSuite([unitsuite, doctest.DocTestSuite()])