#!/usr/bin/python
"""Add 'bitesize' tag to bugs and add a comment."""

# Copyright (c) 2011 Canonical Ltd.
#
# bitesize 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, or (at your option) any
# later version.
#
# bitesize 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 bitesize; see the file COPYING.  If not, write to the Free
# Software Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
# 02110-1301, USA.
#
# Authors:
#  Daniel Holbach <daniel.holbach@canonical.com>

import sys
from optparse import OptionParser

from launchpadlib.launchpad import Launchpad
from launchpadlib.errors import HTTPError

from ubuntutools.logger import Logger
from ubuntutools.config import UDTConfig

def error_out(msg):
    Logger.error(msg)
    sys.exit(1)

def main():
    usage = "Usage: %prog <bug number>"
    opt_parser = OptionParser(usage)
    opt_parser.add_option("-l", "--lpinstance", metavar="INSTANCE",
                          help="Launchpad instance to connect to "
                               "(default: production)",
                          dest="lpinstance", default=None)
    opt_parser.add_option("--no-conf",
                          help="Don't read config files or "
                               "environment variables.",
                          dest="no_conf", default=False, action="store_true")
    (options, args) = opt_parser.parse_args()
    config = UDTConfig(options.no_conf)
    if options.lpinstance is None:
        options.lpinstance = config.get_value("LPINSTANCE")
    if len(args) < 1:
        opt_parser.error("Need at least one bug number.")

    launchpad = Launchpad.login_with("ubuntu-dev-tools", options.lpinstance)
    if launchpad is None:
        error_out("Couldn't authenticate to Launchpad.")

    # check that the new main bug isn't a duplicate
    try:
        bug = launchpad.bugs[args[0]]
    except HTTPError, error:
        if error.response.status == 401:
            error_out("E: Don't have enough permissions to access bug %s" % args[0])
            error_out(error.content)
        else:
            raise
    if 'bitesize' not in bug.tags:
        bug.tags += ['bitesize']
    content = """I'm marking this bug as 'bitesize' as it looks like an issue 
that is easy to fix and suitable for newcomers in Ubuntu development. If you 
need any help with fixing it, talk to me (https://launchpad.net/~%s) about 
it.""" % (launchpad.me.name)
    bug.newMessage(content=content, subject="bitesize bug")
    bug.lp_save()

if __name__ == '__main__':
    main()