name: Publish Docker image to Docker Hub

on:
  push:
    tags:
      - 'v*'
  workflow_dispatch:

jobs:
  docker:
    runs-on: ubuntu-latest
    permissions:
      contents: read

    steps:
      - name: Checkout
        uses: actions/checkout@v4

      - name: Prepare release notes from template
        id: notes
        shell: bash
        run: |
          VERSION_REF="${GITHUB_REF##*/}"  # e.g. v1.2.3
          TEMPLATE="RELEASE_NOTES_TEMPLATE.md"
          if [ -f "$TEMPLATE" ]; then
            sed "s/\${VERSION}/${VERSION_REF}/g" "$TEMPLATE" > RELEASE_NOTES.md
          else
            echo "# MTG Python Deckbuilder ${VERSION_REF}" > RELEASE_NOTES.md
            echo >> RELEASE_NOTES.md
            echo "Automated release." >> RELEASE_NOTES.md
          fi
          # Escape newlines for label usage
          DESC=$(awk 'BEGIN{ORS="\\n"} {print}' RELEASE_NOTES.md)
          echo "desc=$DESC" >> $GITHUB_OUTPUT

      - name: Set up QEMU
        uses: docker/setup-qemu-action@v3

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

      - name: Docker Hub login
        uses: docker/login-action@v3
        with:
          username: ${{ secrets.DOCKERHUB_USERNAME }}
          password: ${{ secrets.DOCKERHUB_TOKEN }}

      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: |
            mwisnowski/mtg-python-deckbuilder
          tags: |
            type=semver,pattern={{version}}
            type=raw,value=latest
          labels: |
            org.opencontainers.image.title=MTG Python Deckbuilder
            org.opencontainers.image.version=${{ github.ref_name }}
            org.opencontainers.image.description=${{ steps.notes.outputs.desc }}

      - name: Build and push
        uses: docker/build-push-action@v6
        with:
          context: .
          file: ./Dockerfile
          push: true
          platforms: linux/amd64,linux/arm64
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}