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

if [ $# -lt 1 ]; then
  echo "用法: scripts/push-backend.sh \"後端 commit 訊息\" [根目錄 commit 訊息]"
  exit 1
fi

SUB_MSG="$1"
ROOT_MSG="${2:-chore: bump backend submodule}"

ROOT_DIR="$(cd "$(dirname "$0")/.." && pwd)"
SUB_DIR="$ROOT_DIR/backend"

current_branch="$(git -C "$SUB_DIR" branch --show-current)"
if [ -z "$current_branch" ]; then
  echo "backend 目前是 detached HEAD，請先執行: cd backend && git checkout master"
  exit 1
fi

if [ "$current_branch" != "master" ]; then
  echo "backend 目前分支是 $current_branch，建議先切到 master 再執行。"
  exit 1
fi

if [ -n "$(git -C "$SUB_DIR" status --porcelain)" ]; then
  git -C "$SUB_DIR" add -A
  git -C "$SUB_DIR" commit -m "$SUB_MSG"
else
  echo "backend 無本地變更，略過 backend commit。"
fi

git -C "$SUB_DIR" push origin master

git -C "$ROOT_DIR" add backend
if ! git -C "$ROOT_DIR" diff --cached --quiet; then
  git -C "$ROOT_DIR" commit -m "$ROOT_MSG"
else
  echo "根目錄無 submodule pointer 變更，略過根目錄 commit。"
fi

git -C "$ROOT_DIR" push origin master

echo "完成: backend 與根目錄已 push。"