#!/usr/bin/env bash

git_author="$(git config user.name)"
git_email="$(git config user.email)"
gpg_keyid=""

base_url="http://downloads.openwrt.org/releases"

[ -f "./feeds.conf.default" ] || {
	echo "Please execute as ./${0##*/}" >&2
	exit 1
}

usage() {
	{
		echo ""
		echo "Usage: $0 [-i] [-a <Git author>] [-e <Git email>] \\"
		echo "          [-k <GPG key id>] [-p <GPG passphrase file>] \\"
		echo "          [-u <Download base url>] -v <version> -o <openwrt version>"
		echo ""
		echo "-i"
		echo "Exit successfully if tag already exists"
		echo ""
		echo "-a Git author [$git_author]"
		echo "Override the author name used for automated Git commits"
		echo ""
		echo "-e Git email [$git_email]"
		echo "Override the email used for automated Git commits"
		echo ""
		echo "-k GPG key id [${gpg_keyid:-none}]"
		echo "Enable GPG signing of tags with given GPG key id"
		echo ""
		echo "-p GPG passphrase file [none]"
		echo "Use the passphrase stored in the given file for signing"
		echo ""
		echo "-u Download base url [$base_url]"
		echo "Use the given URL as base for download repositories"
		echo ""
		echo "-o OpenWrt original version [$openwrt_version]"
		echo "Use the given revision as the original openwrt version"
		echo ""
		exit 1
	} >&2
}

while getopts "a:e:ik:p:u:o:v:" opt; do
	case "$opt" in
		a) git_author="$OPTARG" ;;
		e) git_email="$OPTARG" ;;
		i) ignore_existing=1 ;;
		k) gpg_keyid="${OPTARG#0x}" ;;
		p) gpg_passfile="${OPTARG}" ;;
		u) base_url="${OPTARG%/}" ;;
		o) openwrt_version="$OPTARG" ;;
		v) version="$OPTARG" ;;
		\?)
			echo "Unexpected option: -$OPTARG" >&2
			usage
		;;
		:)
			echo "Missing argument for option: -$OPTARG" >&2
			usage
		;;
	esac
done

[ -n "$version" ] || usage

[ -n "$openwrt_version" ] || usage

if git rev-parse "v${version}^{tag}" >/dev/null 2>/dev/null; then
	if [ -z "$ignore_existing" ]; then
		echo "Tag v${version} already exists!" >&2
		exit 1
	fi

	exit 0
fi

revnum="$(./scripts/getver.sh)"
epoch="$(./scripts/get_source_date_epoch.sh)"

branch="$(git symbolic-ref -q HEAD)"
distro="LibreRouterOs"

case "$branch" in
	*/lede-*) distro="LEDE" ;;
	*/librerouteros-*) distro="LibreRouterOs" ;;
esac

export GIT_AUTHOR_NAME="$git_author"
export GIT_AUTHOR_EMAIL="$git_email"
export GIT_COMMITTER_NAME="$git_author"
export GIT_COMMITTER_EMAIL="$git_email"

sed -e 's!\(VERSION_NUMBER:=\$(if .*\),[^,]*)!\1,'"$version"')!g' \
    -e 's!\(VERSION_CODE:=\$(if .*\),[^,]*)!\1,'"$revnum"')!g' \
    -e 's!\(VERSION_REPO:=\$(if .*\),[^,]*)!\1,'"$base_url/$openwrt_version"')!g' \
	include/version.mk > include/version.tagged && \
		mv include/version.tagged include/version.mk

echo "$revnum" > version && git add version
echo "$epoch" > version.date && git add version.date

git commit -sm "$distro v$version: adjust config defaults" \
	include/version.mk \
	package/base-files/image-config.in \
	version version.date


if [ -n "$gpg_keyid" -a -n "$gpg_passfile" ]; then
	gpg_script="$(tempfile)"

	cat <<-EOT > "$gpg_script"
		#!/usr/bin/env bash
		exec $(which gpg) --batch --passphrase-file $gpg_passfile "\$@"
	EOT

	chmod 0700 "$gpg_script"
fi

git ${gpg_script:+-c "gpg.program=$gpg_script"} tag \
	-a "v$version" \
	-m "$distro v$version Release" \
	${gpg_keyid:+-s -u "$gpg_keyid"}

[ -n "$gpg_script" ] && rm -f "$gpg_script"

git revert --no-edit HEAD
git commit --amend -sm "$distro v$version: revert to branch defaults"

git --no-pager show "v$version"

cat <<EOT
# Push the branch and tag with:
git push origin "${branch#refs/heads/}"
git push origin "refs/tags/v$version:refs/tags/v$version"
EOT