name: Get Version
description: 从 package.json 读取版本号，与最新 tag 对比决定使用哪个版本

outputs:
  version:
    description: 最终确定的版本号 (带 v 前缀)
    value: ${{ steps.get_version.outputs.version }}

runs:
  using: composite
  steps:
    - name: Get version from package.json
      id: get_version
      shell: bash
      run: |
        PKG_VERSION=$(node -p "require('./package.json').version")
        echo "Package.json version: ${PKG_VERSION}"

        # 获取最新的tag（按版本号排序）
        LATEST_TAG=$(git ls-remote --tags origin 'refs/tags/v*' 2>/dev/null | sed 's/.*refs\/tags\///' | sed 's/\^{}//' | sort -V | tail -n 1 || echo "")
        echo "Latest tag: ${LATEST_TAG}"

        # 版本比较函数
        version_compare() {
          # 返回: 0 = 相等, 1 = v1 > v2, 2 = v1 < v2
          if [[ "$1" == "$2" ]]; then echo 0; return; fi
          local IFS=.
          local i v1=($1) v2=($2)
          for ((i=0; i<${#v1[@]} || i<${#v2[@]}; i++)); do
            local n1=${v1[i]:-0} n2=${v2[i]:-0}
            if ((n1 > n2)); then echo 1; return; fi
            if ((n1 < n2)); then echo 2; return; fi
          done
          echo 0
        }

        if [[ -z "${LATEST_TAG}" ]]; then
          # 没有任何tag，直接使用package.json版本
          NEW_TAG="v${PKG_VERSION}"
          echo "No existing tags, using package.json version: ${NEW_TAG}"
        else
          # 去掉v前缀进行比较
          LATEST_VERSION="${LATEST_TAG#v}"
          COMPARE_RESULT=$(version_compare "${PKG_VERSION}" "${LATEST_VERSION}")

          if [[ "${COMPARE_RESULT}" == "1" ]]; then
            # package.json版本更大，使用它
            NEW_TAG="v${PKG_VERSION}"
            echo "Package.json version is greater, using: ${NEW_TAG}"
          else
            # 最新tag版本更大或相等，在其基础上递增patch
            IFS='.' read -r MAJOR MINOR PATCH <<< "${LATEST_VERSION}"
            PATCH=$((PATCH + 1))
            NEW_TAG="v${MAJOR}.${MINOR}.${PATCH}"
            echo "Incrementing from latest tag, new version: ${NEW_TAG}"
          fi
        fi

        echo "version=${NEW_TAG}" >> $GITHUB_OUTPUT
        echo "Final Version: ${NEW_TAG}"