name: 'Cache APT Packages'
description: 'Install APT based packages and cache them for future runs.'
author: awalsh128
branding:
  icon: 'hard-drive'  
  color: 'green'

inputs:
  packages:
    description: 'Space delimited list of packages to install.'
    required: true
    default: ''
  version:
    description: 'Version will create a new cache and install packages.'
    required: false
    default: ''  
  refresh:
    description: 'Option to refresh / upgrade the packages in the same cache.'
    required: false
    default: 'false'

outputs:
  cache-hit:
    description: 'A boolean value to indicate a cache was found for the packages requested.'
    # This compound expression is needed because lhs can be empty.
    # Need to output true and false instead of true and nothing.
    value: ${{ steps.load-cache.outputs.cache-hit || false }}
  package_version_list:
    description: 'The packages and versions that are installed as a comma delimited list with colon delimit on the package version (i.e. <package>:<version,<package>:<version>).'
    value: ${{ steps.get-package-versions.outputs.package_version_list }}

runs:
  using: "composite"
  steps:
    - name: Validate Packages
      run: ${{ github.action_path }}/validate_pkgs.sh "${{ inputs.version }}" ${{ inputs.packages }}
      shell: bash

    - name: Create Cache Key
      run: |
        ${{ github.action_path }}/create_cache_key.sh "${{ inputs.version }})" ${{ inputs.packages }}
      shell: bash

    - name: Load Package Cache
      id: load-cache
      uses: actions/cache@v2
      with:
        path: ~/cache-apt-pkgs
        key: cache-apt-pkgs_${{ env.CACHE_KEY }}

    - name: Load Packages      
      run: |      
        if [ ! ${{ steps.load-cache.outputs.cache-hit }} ] || [ ${{ inputs.refresh }} ]; then
          ${{ github.action_path }}/install_and_cache_pkgs.sh ~/cache-apt-pkgs ${{ inputs.packages }}
        else
          ${{ github.action_path }}/restore_pkgs.sh ~/cache-apt-pkgs /          
        fi
      shell: bash

    - name: Get Package Versions
      id: get-package-versions
      run: |
        output=
        for package in ${{ inputs.packages }}; do
          output=$output,$package:$(dpkg -s $package | grep Version | awk '{print $2}')
        done
        echo '::set-output name=package_version_list::output'
      shell: bash