name: Build Docker Image for Actions
on: [push]
if: github.ref == 'refs/heads/main'
jobs:
  Check-If-Rebuild:
    runs-on: ubuntu-22.04
    env: 
      DEBIAN_FRONTEND: noninteractive
    outputs:
      last-time: ${{ steps.last-time.outputs.last-time }}
      dockerfile-changed: ${{ steps.dockerfile-changed.outputs.dockerfile-changed }}
    steps:
      - name: Install jq
        run: |
          apt-get update -y
          apt-get install -y jq
      - name: Check last repository build time
        id: last-time
        run: curl -s https://hub.docker.com/v2/repositories/drunkendog/standard-build-actions/tags/latest 
          | jq '.last_updated' 
          | xargs -i date --date {} +%s 
          | xargs -i expr $(date +%s) - {}
          | xargs -i echo last-time={} >> $GITHUB_OUTPUT
      - name: Check if Dockerfile changed
        id: dockerfile-changed
        run: |
          if ${{ github.event_name == 'pull_request' }}; then
              echo dockerfile-changed=$(git diff --name-only -r HEAD^1 HEAD | grep -x actions/Dockerfile | wc -l) >> $GITHUB_OUTPUT
          else
              echo dockerfile-changed=$(git diff --name-only ${{ github.event.before }} ${{ github.event.after }} | grep -x actions/Dockerfile | wc -l) >> $GITHUB_OUTPUT
          fi
  Build-Image:
    needs: [Check-If-Rebuild]
    if: needs.Check-If-Rebuild.outputs.last-time > 86400 || needs.Check-If-Rebuild.outputs.dockerfile-changed == 1
    runs-on: ubuntu-22.04
    steps:
      - name: Check out repository code
        uses: actions/checkout@v3
      - name: Get Docker
        run: curl -sL get.docker.io | bash
      - name: Build and upload image
        run: sh actions/build-docker-image.sh ${{ secrets.DOCKER_USERNAME }} ${{ secrets.DOCKER_TOKEN }}