#!/bin/bash
#
# Prepare a new release branch
#

. "$(dirname "${BASH_SOURCE[0]}")/utils.sh"

function usage() {
    >&2 cat << EOM
Create a new release branch 'release-<version>'

Usage:

    $0 <version> [<base_version>]

Options:

    version        version string for the release (ex: 1.6.0)
    base_version   branch or tag to start from. Defaults to master. For
                   bug-fix releases use the previous stage release tag.

EOM
    exit 1
}


[ -n "$1" ] || usage
VERSION=$1
BRANCH=bump-$VERSION
REPO=docker/compose
GITHUB_REPO=git@github.com:$REPO

if [ -z "$2" ]; then
    BASE_VERSION="master"
else
    BASE_VERSION=$2
fi


DEFAULT_REMOTE=release
REMOTE="$(find_remote "$GITHUB_REPO")"
# If we don't have a docker remote add one
if [ -z "$REMOTE" ]; then
    echo "Creating $DEFAULT_REMOTE remote"
    git remote add ${DEFAULT_REMOTE} ${GITHUB_REPO}
fi

# handle the difference between a branch and a tag
if [ -z "$(git name-rev --tags $BASE_VERSION | grep tags)" ]; then
    BASE_VERSION=$REMOTE/$BASE_VERSION
fi

echo "Creating a release branch $VERSION from $BASE_VERSION"
read -n1 -r -p "Continue? (ctrl+c to cancel)"
git fetch $REMOTE -p
git checkout -b $BRANCH $BASE_VERSION

echo "Merging remote release branch into new release branch"
git merge --strategy=ours --no-edit $REMOTE/release

# Store the release version for this branch in git, so that other release
# scripts can use it
git config "branch.${BRANCH}.release" $VERSION


editor=${EDITOR:-vim}

echo "Update versions in docs/install.md, compose/__init__.py, script/run.sh"
$editor docs/install.md
$editor compose/__init__.py
$editor script/run.sh


echo "Write release notes in CHANGELOG.md"
browser "https://github.com/docker/compose/issues?q=milestone%3A$VERSION+is%3Aclosed"
$editor CHANGELOG.md


git diff
echo "Verify changes before commit. Exit the shell to commit changes"
$SHELL || true
git commit -a -m "Bump $VERSION" --signoff --no-verify


echo "Push branch to user remote"
GITHUB_USER=$USER
USER_REMOTE="$(find_remote $GITHUB_USER/compose)"
if [ -z "$USER_REMOTE" ]; then
    echo "$GITHUB_USER/compose not found"
    read -r -p "Enter the name of your GitHub fork (username/repo): " GITHUB_REPO
    # assumes there is already a user remote somewhere
    USER_REMOTE=$(find_remote $GITHUB_REPO)
fi
if [ -z "$USER_REMOTE" ]; then
    >&2 echo "No user remote found. You need to 'git push' your branch."
    exit 2
fi


git push $USER_REMOTE
browser https://github.com/$REPO/compare/docker:release...$GITHUB_USER:$BRANCH?expand=1