#!/bin/bash
#
# Script to generate a release announcement for a project.
#
# All Rights Reserved.
#
#    Licensed under the Apache License, Version 2.0 (the "License"); you may
#    not use this file except in compliance with the License. You may obtain
#    a copy of the License at
#
#         http://www.apache.org/licenses/LICENSE-2.0
#
#    Unless required by applicable law or agreed to in writing, software
#    distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
#    WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
#    License for the specific language governing permissions and limitations
#    under the License.

set -e

if [ $# -lt 1 ]; then
    echo "Usage: $0 path-to-repository [version]"
    echo
    echo "Example: $0 ~/repos/openstack/oslo.rootwrap"
    echo "Example: $0 ~/repos/openstack/oslo.rootwrap 3.0.3"
    exit 2
fi

TOOLSDIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" && pwd )"
source $TOOLSDIR/functions

REPODIR=$1
VERSION=$2
SHORTNAME=`basename $REPODIR`

if [[ -z "$EMAIL" ]]; then
    echo "ERROR: The EMAIL environment variable is not set."
    exit 1
fi

if [[ -z "$VIRTUAL_ENV" ]]; then
    (cd $TOOLSDIR && tox -e venv --notest)
    source $TOOLSDIR/.tox/venv/bin/activate
fi

# Make our output directory before we start moving around into
# temporary directories.
RELNOTESDIR="$PWD/relnotes"
mkdir -p $RELNOTESDIR

# Set up temporary directory for scratch files
setup_temp_space announce-$SHORTNAME

cd $REPODIR

# Determine the most recent tag if we weren't given a value.
if [[ -z "$VERSION" ]]; then
    VERSION=$(get_last_tag)
fi

# Look for the previous version on the same branch.
PREVIOUS_VERSION=$(git describe --abbrev=0 ${VERSION}^)

# Extract the tag message by parsing the git show output, which looks
# something like:
#
# tag 2.0.0
# Tagger: Doug Hellmann <doug@doughellmann.com>
# Date:   Tue Dec 1 21:45:44 2015 +0000
#
# python-keystoneclient 2.0.0 release
#
# meta:version: 2.0.0
# meta:series: mitaka
# meta:release-type: release
# -----BEGIN PGP SIGNATURE-----
# Comment: GPGTools - http://gpgtools.org
#
# iQEcBAABAgAGBQJWXhUIAAoJEDttBqDEKEN62rMH/ihLAGfw5GxPLmdEpt7gsLJu
# ...
#
TAG_META=$(git show --no-patch "$VERSION" | grep '^meta:' || true)
if [[ -z "$TAG_META" ]]; then
    echo ERROR: Missing meta lines in $VERSION tag message.
    exit 1
fi

function get_tag_meta {
    typeset fieldname="$1"

    echo "$TAG_META" | grep "^meta:$fieldname:" | cut -f2 -d' '
}

# The series name is part of the commit message left by release.sh.
SERIES=$(get_tag_meta series)

# Figure out if that series is a stable branch or not.
if git branch -a | grep -q origin/stable/$SERIES; then
    stable="--stable"
fi

# Set up email tags for the project owner.
PROJECT_OWNER=${PROJECT_OWNER:-$(get-repo-owner --email-tag openstack/$SHORTNAME || echo "")}
if [[ "$PROJECT_OWNER" != "" ]]; then
    email_tags="--email-tags ${PROJECT_OWNER}"
fi

echo "$PREVIOUS_VERSION to $VERSION on $SERIES"

relnotes_file="$RELNOTESDIR/$SHORTNAME-$VERSION"

release-notes \
    --email \
    $email_tags \
    --series $SERIES \
    $stable \
    . $PREVIOUS_VERSION $VERSION \
    --include-pypi-link \
    | tee $relnotes_file

echo
echo $relnotes_file

exit 0