name: detect-runner-os
description: |
  Detect the actual OS name and version of the runner.
  Provides separate outputs for name, version, and a combined slug.

outputs:
  name:
    description: 'OS name (e.g. Ubuntu, Debian)'
    value: ${{ steps.detect.outputs.name }}
  version:
    description: 'OS version (e.g. 22.04, 11)'
    value: ${{ steps.detect.outputs.version }}
  slug:
    description: 'Combined OS slug (e.g. Ubuntu-22.04)'
    value: ${{ steps.detect.outputs.slug }}
  node_major:
    description: 'Major version of Node.js if available (e.g. 22)'
    value: ${{ steps.detect.outputs.node_major }}
  node_version:
    description: 'Full Node.js version if available (e.g. 22.19.0)'
    value: ${{ steps.detect.outputs.node_version }}

runs:
  using: composite
  steps:
    - name: Detect runner OS
      id: detect
      shell: bash
      run: |
        # Detect OS version (try lsb_release first, fall back to /etc/os-release)
        OS_VERSION=$(lsb_release -rs 2>/dev/null || grep VERSION_ID /etc/os-release | cut -d'"' -f2)

        # Detect OS name and capitalise (try lsb_release first, fall back to /etc/os-release)
        OS_NAME=$(lsb_release -is 2>/dev/null || grep "^ID=" /etc/os-release | cut -d'=' -f2 | tr -d '"' | sed 's/\b\(.\)/\u\1/g')

        # Create combined slug
        OS_SLUG="${OS_NAME}-${OS_VERSION}"

        # Detect Node.js version if available
        if command -v node >/dev/null 2>&1; then
          NODE_VERSION=$(node --version | sed 's/v//')
          NODE_MAJOR=$(echo $NODE_VERSION | cut -d. -f1)
          echo "node_version=${NODE_VERSION}" >> $GITHUB_OUTPUT
          echo "node_major=${NODE_MAJOR}" >> $GITHUB_OUTPUT
          echo "🔍 Detected Node.js: v${NODE_VERSION}"
        else
          echo "node_version=" >> $GITHUB_OUTPUT
          echo "node_major=" >> $GITHUB_OUTPUT
          echo "🔍 Node.js not found"
        fi

        # Set OS outputs
        echo "name=${OS_NAME}" >> $GITHUB_OUTPUT
        echo "version=${OS_VERSION}" >> $GITHUB_OUTPUT
        echo "slug=${OS_SLUG}" >> $GITHUB_OUTPUT

        # Log detection results
        echo "🔍 Detected Runner OS: ${OS_NAME} ${OS_VERSION}"