# -*- coding: utf-8 -*-
# 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/>.
"""
kallithea.bin.kallithea_backup
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Repositories backup manager, it allows to backups all
repositories and send it to backup server using RSA key via ssh.

This file was forked by the Kallithea project in July 2014.
Original author and date, and relevant copyright and licensing information is below:
:created_on: Feb 28, 2010
:author: marcink
:copyright: (c) 2013 RhodeCode GmbH, and others.
:license: GPLv3, see LICENSE.md for more details.
"""

import datetime
import logging
import os
import subprocess
import sys
import tarfile
import tempfile


logging.basicConfig(level=logging.DEBUG,
                    format="%(asctime)s %(levelname)-5.5s %(message)s")


class BackupManager(object):
    def __init__(self, repos_location, rsa_key, backup_server):
        today = datetime.datetime.now().weekday() + 1
        self.backup_file_name = "repos.%s.tar.gz" % today

        self.id_rsa_path = self.get_id_rsa(rsa_key)
        self.repos_path = self.get_repos_path(repos_location)
        self.backup_server = backup_server

        self.backup_file_path = tempfile.gettempdir()

        logging.info('starting backup for %s', self.repos_path)
        logging.info('backup target %s', self.backup_file_path)

    def get_id_rsa(self, rsa_key):
        if not os.path.isfile(rsa_key):
            logging.error('Could not load id_rsa key file in %s', rsa_key)
            sys.exit()
        return rsa_key

    def get_repos_path(self, path):
        if not os.path.isdir(path):
            logging.error('Wrong location for repositories in %s', path)
            sys.exit()
        return path

    def backup_repos(self):
        bckp_file = os.path.join(self.backup_file_path, self.backup_file_name)
        tar = tarfile.open(bckp_file, "w:gz")

        for dir_name in os.listdir(self.repos_path):
            logging.info('backing up %s', dir_name)
            tar.add(os.path.join(self.repos_path, dir_name), dir_name)
        tar.close()
        logging.info('finished backup of mercurial repositories')

    def transfer_files(self):
        params = {
                  'id_rsa_key': self.id_rsa_path,
                  'backup_file': os.path.join(self.backup_file_path,
                                             self.backup_file_name),
                  'backup_server': self.backup_server
                  }
        cmd = ['scp', '-l', '40000', '-i', '%(id_rsa_key)s' % params,
               '%(backup_file)s' % params,
               '%(backup_server)s' % params]

        subprocess.call(cmd)
        logging.info('Transferred file %s to %s', self.backup_file_name, cmd[4])

    def rm_file(self):
        logging.info('Removing file %s', self.backup_file_name)
        os.remove(os.path.join(self.backup_file_path, self.backup_file_name))


if __name__ == "__main__":

    repo_location = '/home/repo_path'
    backup_server = 'root@192.168.1.100:/backups/mercurial'
    rsa_key = '/home/id_rsa'

    B_MANAGER = BackupManager(repo_location, rsa_key, backup_server)
    B_MANAGER.backup_repos()
    B_MANAGER.transfer_files()
    B_MANAGER.rm_file()