#! /usr/bin/python
#
# Copyright (C) 2007, Canonical Ltd.
# Written by Daniel Holbach,
#            Stefano Rivera,
#            Brian Murray
#
# ##################################################################
#
# 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 3.
#
# 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.
#
# See file /usr/share/common-licenses/GPL-3 for more details.
#
# ##################################################################

from optparse import OptionParser
import codecs
import errno
import os

from lptools import config

USAGE = "lp-grab-attachments <bug numbers>"


def download_attachments(bug, descriptions):

    bug_folder_name = 'bug-%s' % bug.id

    try:
        os.mkdir(bug_folder_name)
    except OSError, error:
        if error.errno == errno.EEXIST:
            return

    if descriptions:
        description = bug.description
        filename = os.path.join(os.getcwd(), bug_folder_name,
            'Description.txt')
        local_file = codecs.open(filename, encoding="utf-8", mode="w")
        local_file.write(description)
        local_file.close()

    for attachment in bug.attachments:
        f = attachment.data.open()
        filename = os.path.join(os.getcwd(), bug_folder_name, f.filename)
        local_file = open(filename, "w")
        local_file.write(f.read())
        f.close()
        local_file.close()


def main():
    parser = OptionParser('Usage: %prog [options] <bug numbers>')
    parser.add_option('-d', '--duplicates', default=False,
                      action='store_true',
                      help='Download attachments from duplicates too')
    parser.add_option('-p', '--package',
                      help='Download attachments from all bugs with an '
                           'open task for this Ubuntu source package')
    parser.add_option('-P', '--project',
                      help='Download attachments from all bugs with a '
                           'open task for this project')
    parser.add_option('-D', '--descriptions', default=False,
                      action='store_true',
                      help='Also download bug descriptions as Description.txt')

    opts, args = parser.parse_args()
    if len(args) < 1 and not opts.package and not opts.project:
        parser.error('No bug numbers provided')
    launchpad = config.get_launchpad("grab-attachments")

    if opts.package:
        ubuntu = launchpad.projects['ubuntu']
        src_package = ubuntu.getSourcePackage(name=opts.package)
        if src_package is None:
            parser.error('Unable to find package %s' % opts.package)
        for task in src_package.searchTasks():
            args.append(task.bug.id)

    if opts.project:
        try:
            project = launchpad.projects['%s' % opts.project]
        except KeyError:
            parser.error('Unable to find project %s' % opts.project)
        for task in project.searchTasks():
            args.append(task.bug.id)

    for arg in args:
        try:
            bug_number = int(arg)
        except ValueError:
            parser.error("'%s' is not a valid bug number." % arg)

        bug = launchpad.bugs[bug_number]
        download_attachments(bug, opts.descriptions)

        if opts.duplicates is True:
            for bug in bug.duplicates:
                download_attachments(bug, opts.descriptions)

if __name__ == '__main__':
    main()