name: Docker Build and Publish

on:
  push:
    branches: ["main"]
    tags: ["v*"]

env:
  REGISTRY: git.maxboeer.com
  IMAGE_NAME: components-elixir

jobs:
  docker-build:
    runs-on: ubuntu-latest

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

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

    - name: Extract metadata
      id: meta
      uses: docker/metadata-action@v5
      with:
        images: ${{ env.REGISTRY }}/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}
        tags: |
          # Keep a moving branch tag (e.g., main)
          type=ref,event=branch
          # Version tag on releases (e.g., v1.2.3)
          type=ref,event=tag
          # Snapshot tag for commits on the default branch (e.g., snapshot-<hash>)
          type=raw,value=snapshot-{{sha}},enable={{is_default_branch}}
          # Move "latest" only when building from a tag
          type=raw,value=latest,enable={{is_tag}}

    - name: Log in to Container Registry
      uses: docker/login-action@v3
      with:
        registry: ${{ env.REGISTRY }}
        username: ${{ github.actor }}
        password: ${{ secrets.GITEAX_TOKEN }}

    - name: Build and push Docker image
      uses: docker/build-push-action@v5
      with:
        context: .
        platforms: linux/amd64
        push: true
        tags: ${{ steps.meta.outputs.tags }}
        labels: ${{ steps.meta.outputs.labels }}
        # GitHub Actions cache needs proper runner configuration
        # https://docs.gitea.com/usage/actions/act-runner#configuring-cache-when-starting-a-runner-using-docker-image
        cache-from: type=gha
        cache-to: type=gha,mode=max
        build-args: |
          ELIXIR_VERSION=1.15
          OTP_VERSION=26
          DEBIAN_VERSION=bookworm-slim

    - name: Generate summary
      run: |
        echo "## Docker Build Summary" >> $GITHUB_STEP_SUMMARY
        echo "- **Image**: \`${{ env.REGISTRY }}/${{ github.repository_owner }}/${{ env.IMAGE_NAME }}\`" >> $GITHUB_STEP_SUMMARY
        echo "- **Platform**: linux/amd64" >> $GITHUB_STEP_SUMMARY
        echo "- **Tags**: " >> $GITHUB_STEP_SUMMARY
        echo "\`\`\`" >> $GITHUB_STEP_SUMMARY
        echo "${{ steps.meta.outputs.tags }}" >> $GITHUB_STEP_SUMMARY
        echo "\`\`\`" >> $GITHUB_STEP_SUMMARY
        if [[ "${{ github.ref_type }}" == "tag" ]]; then
          echo "- **Build Type**: Release build for tag \`${{ github.ref_name }}\`" >> $GITHUB_STEP_SUMMARY
        else
          echo "- **Build Type**: Snapshot build for branch \`${{ github.ref_name }}\`" >> $GITHUB_STEP_SUMMARY
        fi
        echo "- **Commit**: \`${{ github.sha }}\`" >> $GITHUB_STEP_SUMMARY