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

ROOT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
cd "$ROOT_DIR"

PORT="${PORT:-4000}"
HOST="${HOST:-127.0.0.1}"
BRANCH="${BRANCH:-main}"

usage() {
  cat <<'EOF'
用法:
  ./scripts/blog.sh preview   # 一键预览环境
  ./scripts/blog.sh deploy    # 一键构建 + 提交 + 推送到自建 git

可选环境变量:
  PORT=4000   预览端口
  HOST=127.0.0.1  预览监听地址
  BRANCH=main  推送分支
EOF
}

preview() {
  echo "[preview] clean + start hexo server on ${HOST}:${PORT}"
  npx hexo clean
  exec npx hexo server -i "${HOST}" -p "${PORT}"
}

deploy() {
  echo "[deploy] clean + generate"
  npx hexo clean
  npx hexo generate

  echo "[deploy] git add"
  git add -A

  if git diff --cached --quiet; then
    echo "[deploy] 没有可提交的改动，跳过 commit/push"
    exit 0
  fi

  if git diff --cached --quiet --ignore-submodules --exit-code; then
    : # keep shellcheck calm
  fi

  if ! git rev-parse --verify HEAD >/dev/null 2>&1; then
    git commit -m "chore: deploy blog"
  else
    git commit -m "chore: deploy blog $(date '+%F %T')"
  fi

  echo "[deploy] push origin ${BRANCH}"
  git push origin "${BRANCH}"
}

case "${1:-}" in
  preview) preview ;;
  deploy) deploy ;;
  -h|--help|help|"") usage ;;
  *)
    echo "未知命令: $1" >&2
    usage
    exit 1
    ;;
esac