#!/bin/bash

set -eu

series=$1

source=$(dpkg-parsechangelog -SSource)
version=$(dpkg-parsechangelog -SVersion)
branch=$(git rev-parse --abbrev-ref HEAD)

if [ $(echo $branch | cut -d- -f1) != "merge" ]; then
    echo "wrong branch"
    exit 1
fi

VER=$(echo $branch | cut -d- -f2)
MAJOR=$(echo $VER | cut -d. -f1)
MINOR=$(echo $VER | cut -d. -f2)
OMINOR=$((MINOR-1))

P="$(echo -e '\033[01;32mnext command:\033[00m ')"

e () {
    q="$(printf " %q" "$@")"
    echo
    read -er -a n -i "${q# }" -p "$P"
    echo
    eval "${n[@]}"
}

e git checkout -b $series-$MAJOR.$MINOR merge-$MAJOR.$MINOR

echo

for h in $(git rev-list --reverse merge-$MAJOR.$OMINOR..$series-$MAJOR.$OMINOR); do
    commit=$(git log -1 --pretty=format:%s $h)
    case "$commit" in
        releasing*|reconstruct*)
            break;;
    esac
    git cherry-pick --allow-empty $h || bash
    if git diff-tree --no-commit-id --name-only -r HEAD | grep -q ^debian/patches; then
        while ! quilt push -a; do
            bash
        done
        quilt refresh
        quilt pop -a
        if ! git diff --exit-code > /dev/null; then
            git commit --amend --no-edit --all
        fi
    fi
done

git log --oneline merge-$MAJOR.$MINOR..HEAD

e dch -b -v $version~$(ubuntu-distro-info --series=$series --release | awk '{ print $1 }').1 '' --release-heuristic log -D UNRELEASED
e git reconstruct-changelog merge-$MAJOR.$MINOR
git diff
e git commit -am reconstruct-changelog
e rustbuild.sh --test