# -*- 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.lib.paster_commands.cleanup

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

cleanup-repos paster command for Kallithea

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: Jul 14, 2012

:author: marcink

:copyright: (c) 2013 RhodeCode GmbH.

:license: GPLv3, see LICENSE.md for more details.

"""

from __future__ import with_statement

import os

import sys

import re

import shutil

import logging

import datetime

from kallithea.lib.utils import BasePasterCommand, ask_ok, REMOVED_REPO_PAT

from kallithea.lib.utils2 import safe_str

from kallithea.model.db import Ui

# Add location of top level folder to sys.path

from os.path import dirname as dn

rc_path = dn(dn(dn(os.path.realpath(__file__))))

sys.path.append(rc_path)

log = logging.getLogger(__name__)

class Command(BasePasterCommand):

    max_args = 1

    min_args = 1

    usage = "CONFIG_FILE"

    group_name = "Kallithea"

    takes_config_file = -1

    parser = BasePasterCommand.standard_parser(verbose=True)

    summary = "Cleanup deleted repos"

    def _parse_older_than(self, val):

        regex = re.compile(r'((?P<days>\d+?)d)?((?P<hours>\d+?)h)?((?P<minutes>\d+?)m)?((?P<seconds>\d+?)s)?')

        parts = regex.match(val)

        if not parts:

            return

        parts = parts.groupdict()

        time_params = {}

        for (name, param) in parts.iteritems():

            if param:

                time_params[name] = int(param)

        return datetime.timedelta(**time_params)

    def _extract_date(self, name):

        """

        Extract the date part from rm__<date> pattern of removed repos,

        and convert it to datetime object

        :param name:

        """

        date_part = name[4:19]  # 4:19 since we don't parse milisecods

        return datetime.datetime.strptime(date_part, '%Y%m%d_%H%M%S')

    def command(self):

        #get SqlAlchemy session

        self._init_session()

        repos_location = Ui.get_repos_location()

        to_remove = []

        for dn, dirs, f in os.walk(safe_str(repos_location)):

            alldirs = list(dirs)

            del dirs[:]

            if ('.hg' in alldirs or

                'objects' in alldirs and ('refs' in alldirs or 'packed-refs' in f)):

                continue

            for loc in alldirs:

                if REMOVED_REPO_PAT.match(loc):

                    to_remove.append([os.path.join(dn, loc),

                                      self._extract_date(loc)])

                else:

                    dirs.append(loc)

        #filter older than (if present)!

        now = datetime.datetime.now()

        older_than = self.options.older_than

        if older_than:

            to_remove_filtered = []

            older_than_date = self._parse_older_than(older_than)

            for name, date_ in to_remove:

                repo_age = now - date_

                if repo_age > older_than_date:

                    to_remove_filtered.append([name, date_])

            to_remove = to_remove_filtered

            print >> sys.stdout, 'removing %s deleted repos older than %s (%s)' \

                % (len(to_remove), older_than, older_than_date)

        else:

            print >> sys.stdout, 'removing all [%s] deleted repos' \

                % len(to_remove)

        if self.options.dont_ask or not to_remove:

            # don't ask just remove !

            remove = True

        else:

            remove = ask_ok('the following repositories will be deleted completely:\n%s\n'

                            'are you sure you want to remove them [y/n]?'

                            % ', \n'.join(['%s removed on %s'

                    % (safe_str(x[0]), safe_str(x[1])) for x in to_remove]))

        if remove:

            for path, date_ in to_remove:

                print >> sys.stdout, 'removing repository %s' % path

                shutil.rmtree(path)

        else:

            print 'nothing done exiting...'

            sys.exit(0)

    def update_parser(self):

        self.parser.add_option(

            '--older-than',

            action='store',

            dest='older_than',

            help=("only remove repos that have been removed "

                 "at least given time ago. "

                 "The default is to remove all removed repositories. "

                 "Possible suffixes: "

                 "d (days), h (hours), m (minutes), s (seconds). "

                 "For example --older-than=30d deletes repositories "

                 "removed more than 30 days ago.")

            )

        self.parser.add_option(

            '--dont-ask',

            action="store_true",

            dest="dont_ask",

            help="remove repositories without asking for confirmation."

        )

    cleanup-repos=kallithea.lib.paster_commands.cleanup:Command