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

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
cd "$SCRIPT_DIR"

REMOTE="${GIT_REMOTE:-origin}"
BRANCH="${GIT_BRANCH:-$(git branch --show-current)}"

if [ -z "$BRANCH" ]; then
  echo "ERROR: 当前不是普通分支，不能在 detached HEAD 状态下提交。" >&2
  exit 1
fi

if [ -d .git/rebase-merge ] || [ -d .git/rebase-apply ] || [ -f .git/MERGE_HEAD ]; then
  echo "ERROR: 当前仓库存在未完成的 merge/rebase，请先处理后再执行。" >&2
  exit 1
fi

MESSAGE="${*:-}"
if [ -z "$MESSAGE" ]; then
  MESSAGE="chore: update code $(date '+%Y-%m-%d %H:%M:%S')"
fi

echo "Repo:   $(git rev-parse --show-toplevel)"
echo "Branch: $BRANCH"
echo "Remote: $REMOTE"
echo "Msg:    $MESSAGE"

git add -A

if git diff --cached --quiet; then
  echo "没有需要提交的修改。"
  exit 0
fi

git commit -m "$MESSAGE"

if git ls-remote --exit-code --heads "$REMOTE" "$BRANCH" >/dev/null 2>&1; then
  git fetch "$REMOTE" "$BRANCH"
  REMOTE_REF="refs/remotes/$REMOTE/$BRANCH"
  if git show-ref --verify --quiet "$REMOTE_REF"; then
    if ! git merge-base --is-ancestor "$REMOTE_REF" HEAD; then
      echo "远端 $REMOTE/$BRANCH 有本地没有的提交，开始 rebase。"
      git pull --rebase "$REMOTE" "$BRANCH"
    fi
  fi
fi

git push "$REMOTE" "HEAD:$BRANCH"
echo "提交并推送完成：$(git rev-parse --short HEAD)"