name: Create and publish a Docker image - Upstream changes

on:
  schedule:
    - cron: '0 0 * * *'

env:
  IMAGE_NAME: ${{ github.repository }}

jobs:
  push_to_registry:
    name: Push Docker image to Docker Hub
    runs-on: ubuntu-latest
    steps:
      - name: Get metadata from MTAPI repo
        uses: varunsridharan/action-repository-meta@main
        with:
          REPOSITORY: jonthornton/MTAPI
        env:
          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
          
      - name: Echo last push date for MTAPI repo    
        run: echo $REPOSITORY_PUSHED_AT
        env:
          REPOSITORY_PUSHED_AT: ${{ env.REPOSITORY_PUSHED_AT }}
          
      - name: Set current date as env variable
        run: echo "NOW=$(date +%s)" >> $GITHUB_ENV
      
      - name: Calculate time difference between now and last push to MTAPI repo
        run: echo "SEC_SINCE_UPDATE=$((NOW - $(date --date $REPOSITORY_PUSHED_AT +%s)))" >> $GITHUB_ENV
        
        # All remaining steps will be skipped if the upstream repo hasn't pushed changes in the last 24h
      
      - name: Check out the repo
        if: ${{ env.SEC_SINCE_UPDATE < 86400 }}
        uses: actions/checkout@v3
      
      - name: Check out MTAPI repo
        if: ${{ env.SEC_SINCE_UPDATE < 86400 }}
        uses: actions/checkout@v3
        with:
          repository: jonthornton/MTAPI
          path: MTAPI
      
      - name: Log in to Docker Hub
        if: ${{ env.SEC_SINCE_UPDATE < 86400 }}
        uses: docker/login-action@f054a8b539a109f9f41c372932f1ae047eff08c9
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}
      
      - name: Extract metadata (tags, labels) for Docker
        if: ${{ env.SEC_SINCE_UPDATE < 86400 }}
        id: meta
        uses: docker/metadata-action@98669ae865ea3cffbcbaa878cf57c20bbf1c6c38
        with:
          images: ${{ env.IMAGE_NAME }}
      
      - name: Build and push Docker image
        if: ${{ env.SEC_SINCE_UPDATE < 86400 }}
        uses: docker/build-push-action@ad44023a93711e3deb337508980b4b5e9bcdc5dc
        with:
          context: .
          push: true
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}