#!/usr/bin/env sh

. ./common.sh

trap error INT TERM

start

rebuild() {
	host="$(resolveAlias $1)"
	skip_check=$2

	build_host=${BUILD_HOST:-$host}
	msg "Rebuilding: ${host} using ${build_host}"
	nixos-rebuild ${TRACE} --flake .#${1} --build-host "root@${build_host}" --target-host "root@${host}" switch 2>&1 | nom
	return $?
}

if [ "$1" = "watch" ]; then
	if [ "$2" = "status" ]; then
		for f in pull_requests/*.json; do
			pr=$(basename $f .json)
			title="$(jq -r '.title' <$f)"
			status="$(jq -r '.status' <$f)"
			echo "${pr}|${title}|${status}"
		done | column -t -s '|'
		exit 0
	fi

	if [ "$2" = "update" ]; then
		msg "updating watches..."
		for f in pull_requests/*.json; do
			pr=$(basename $f .json)
			if [ "$(jq -r '.status' <$f)" = "open" ]; then
				curl -s -o - https://pr-status.otter-alligator.ts.net/${pr} | jq -rS 'del(.queryTime)' >pull_requests/${pr}.json
				msg "Updated watch for ${pr}: $(jq -r .title <pull_requests/${pr}.json)"
			else
				msg "$Skipping: ${pr} ($(jq -r .title <pull_requests/${pr}.json)), already complete"
			fi
		done
	else
		pr="$2"
		curl -s -o - https://pr-status.otter-alligator.ts.net/${pr} | jq -rS 'del(.queryTime)' >pull_requests/${pr}.json
		msg "Added watch for ${pr}: $(jq -r .title <pull_requests/${pr}.json)"
		git add pull_requests/${pr}.json
	fi
	exit 0
fi

if [ "$1" = "local" ]; then
	sudo nixos-rebuild ${TRACE} --option eval-cache false --flake .#$(uname -n) switch 2>&1 | nom
	exit $?
fi

if [ "$1" = "update" ]; then
	single="$2"
	can_sign=0
	for i in $(ssh-add -L | awk '{print $2}'); do
		grep -q $i .allowed_signers && can_sign=1
	done

	# TODO: capture commit message and wrap it with what is being updated.
	if [ $can_sign != 1 ]; then
		echo "Can't find signing key."
		exit 1
	fi

	if [ "$single" != "" ]; then
		nix flake update --commit-lock-file "$single"
	else
		nix flake update --commit-lock-file
	fi
	nix flake archive
fi

if [ "$1" = "diff" ]; then
	host="$(resolveAlias $2)"
	mkdir -p .gcroots
	out=$(nix build -o .gcroots/${host} --json .#nixosConfigurations.${2}.config.system.build.toplevel | jq -r '.[0].outputs.out')
	nix copy -s --to "ssh://root@$host" "$out"
	nix copy -s --derivation --to "ssh://root@$host" "$out"
	${SSH} "root@$host" "nix-store -qd /run/current-system $out | xargs nix-diff --color=always" | less
	exit $?
fi

ret=0
if [ ${#@} = 1 ]; then
	rebuild $1 true || ret=1
else
	lock
	for host in $(listNixOSHosts); do
		rebuild $host false || ret=1
	done
fi