name: Docker Metadata

on:
  workflow_call:
    inputs:
      flavor:
        required: false
        type: string
    secrets:
      DOCKERHUB_USERNAME:
        required: false
      DOCKERHUB_ORGANIZATION:
        required: false
    outputs:
      labels:
        value: ${{ jobs.generate-metadata.outputs.labels }}
      tags:
        value: ${{ jobs.generate-metadata.outputs.tags }}

jobs:
  generate-metadata:
    name: Generate Metadata
    runs-on: ubuntu-22.04
    outputs:
      labels: ${{ steps.metadata.outputs.labels }}
      tags: ${{ steps.metadata.outputs.tags }}
    steps:
      -
        name:  Generate docker image names for publishing
        id: docker_image_names
        run: |
          # suggestion from https://trstringer.com/github-actions-multiline-strings/ to handle
          # passing multi-line strings to subsequent action
          echo 'IMAGE_NAMES<<EOF' >> ${GITHUB_ENV}
          echo ghcr.io/${{ github.repository_owner }}/vagrant-libvirt >> ${GITHUB_ENV}
          if [[ -n "${{ secrets.DOCKERHUB_USERNAME }}" ]] && [[ ${{ github.event_name }} != pull_request* ]]
          then
              echo ${{ secrets.DOCKERHUB_ORGANIZATION }}/vagrant-libvirt >> ${GITHUB_ENV}
          fi
          echo 'EOF' >> ${GITHUB_ENV}
      -
        name: Setup publish tags and versions for image
        id: metadata
        uses: docker/metadata-action@v4
        with:
          images: |
            ${{ env.IMAGE_NAMES }}
          tags: |
            # nightly
            type=schedule
            # tag events
            type=pep440,pattern={{version}}
            type=pep440,pattern={{major}}
            type=pep440,pattern={{major}}.{{minor}}
            type=pep440,pattern={{version}},value=latest
            # push to master
            type=edge,branch=${{ github.event.repository.default_branch }}
            type=sha,enable={{is_default_branch}}
            # pull requests
            type=ref,event=pr
          flavor: ${{ inputs.flavor }}