#!/usr/bin/python

# Copyright (c) 2009 Canonical Ltd.
#
# 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, or (at your option) any
# later version.
#
# lp-project-upload 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.

# Authors:
#  Martin Pitt <martin.pitt@ubuntu.com>, based on
#  http://blog.launchpad.net/api/recipe-for-uploading-files-via-the-api

'''Upload a release tarball to a Launchpad project.'''

import datetime
import os
import subprocess
import sys
import tempfile

from ubuntutools.lp.libsupport import get_launchpad
from launchpadlib.errors import HTTPError

def create_release(project, version):
    '''Create new release and milestone for LP project.'''

    print 'Release %s could not be found for project. Create it? (Y/n)' % \
          version
    answer = sys.stdin.readline().strip()
    if answer.startswith('n'):
        sys.exit(0)

    n_series = len(project.series)
    if n_series == 1:
        series = project.series[0]
    elif n_series > 1:
        msg = 'More than one series exist. Which one would you like to ' \
              'upload to? Possible series are (listed as index, name):'
        print msg
        for idx, serie in enumerate(project.series):
            print '\t%i - %s' % (idx, serie.name)
        print 'Enter series index: '
        answer = sys.stdin.readline().strip()
        try:
            series = project.series[int(answer)]
        except (ValueError, IndexError):
            print >> sys.stderr, 'The series index is invalid (%s).' % answer
            sys.exit(3)
        else:
            print "Using series named '%s'" % series.name
    else:
        print >> sys.stderr, ('Does not support creating releases if no '
                              'series exists.')
        sys.exit(3)

    release_date = datetime.date.today().strftime('%Y-%m-%d')
    milestone = series.newMilestone(name=version,
            date_targeted=release_date)
    return milestone.createProductRelease(date_released=release_date)

def edit_file(prefix, description):
    (fd, f) = tempfile.mkstemp(prefix=prefix+'.')
    os.write(fd, '\n\n#------\n# Please enter the %s here. '
                 'Lines which start with "#" are ignored.\n' % description)
    os.close(fd)
    subprocess.call(['sensible-editor', f])
    content = ''
    for line in open(f):
        if line.startswith('#'):
            continue
        content += line

    return content.strip()

def main():
    if len(sys.argv) != 4:
        print >> sys.stderr, '''Upload a release tarball to a Launchpad project.

    Usage: %s <project name> <version> <tarball>''' % sys.argv[0]
        sys.exit(1)

    (project, version, tarball) = sys.argv[1:]

    try:
        launchpad = get_launchpad('ubuntu-dev-tools')
    except Exception, error:
        print >> sys.stderr, 'Could not connect to Launchpad:', str(error)
        sys.exit(2)

    try:
        # Look up the project using the Launchpad instance.
        proj = launchpad.projects[project]
        # Find the release in the project's releases collection.
        release = None
        for rel in proj.releases:
            if rel.version == version:
                release = rel
                break
        if not release:
            release = create_release(proj, version)

        # Get the file contents.
        file_content = open(tarball, 'r').read()
        # Get the signature, if available.
        signature = tarball + '.asc'
        if not os.path.exists(signature):
            print 'Calling GPG to create tarball signature...'
            cmd = ['gpg', '--armor', '--sign', '--detach-sig', tarball]
            if subprocess.call(cmd) != 0:
                print >> sys.stderr, 'gpg failed, aborting'

        if os.path.exists(signature):
            signature_content = open(signature, 'r').read()
        else:
            signature_content = None

        # Create a new product release file.
        filename = os.path.basename(tarball)
        release.add_file(filename=filename, description='release tarball',
                file_content=file_content, content_type='appplication/x-gzip',
                file_type='Code Release Tarball', signature_filename=signature,
                signature_content=signature_content)

        changelog = edit_file('changelog', 'changelog')
        if changelog:
            release.changelog = changelog
        release_notes = edit_file('releasenotes', 'release notes')
        if release_notes:
            release.release_notes = release_notes

        release.lp_save()

    except HTTPError, error:
        print 'An error happened in the upload:', error.content
        sys.exit(1)

if __name__ == '__main__':
    main()