#!/usr/bin/env bash
set -Eeuo pipefail

require_var() {
  local name="$1"
  if [ -z "${!name:-}" ]; then
    printf 'Required environment variable %s is missing\n' "$name" >&2
    exit 2
  fi
}

quote() {
  printf '%q' "$1"
}

require_var SWARM_MANAGER_HOST
require_var SWARM_SSH_USER
require_var ENVIRONMENT
require_var STACK_NAME

SSH_PORT="${SWARM_SSH_PORT:-22}"
SSH_TARGET="${SWARM_SSH_USER}@${SWARM_MANAGER_HOST}"
REMOTE_DEPLOY_DIR="${REMOTE_DEPLOY_DIR:-/tmp/videoreg-deploy}"

ssh -p "$SSH_PORT" "$SSH_TARGET" "mkdir -p $(quote "$REMOTE_DEPLOY_DIR")"
scp -P "$SSH_PORT" deploy/remote/rollback-stack.sh "$SSH_TARGET:$REMOTE_DEPLOY_DIR/rollback-stack.sh"

remote_command="ENVIRONMENT=$(quote "$ENVIRONMENT") STACK_NAME=$(quote "$STACK_NAME") "
if [ -n "${RELEASE_LOCK_FILE:-}" ]; then
  remote_command+="RELEASE_LOCK_FILE=$(quote "$RELEASE_LOCK_FILE") "
fi
remote_command+="bash $(quote "$REMOTE_DEPLOY_DIR/rollback-stack.sh")"

ssh -p "$SSH_PORT" "$SSH_TARGET" "$remote_command"