name: Build and Publish Docker Images

on:
  push:
    paths:
      - "**"
      - "!docs/**"
      - "!deploy/**"
      - "!setup.py"
      - "!.gitignore"
      - "!.github/workflows/**"
      - ".github/workflows/docker.yml"
    branches:
      - "*"
    tags:
      - "v?[0-9]+.[0-9]+.[0-9]*"
  workflow_dispatch:

env:
  REGISTRY: ghcr.io

jobs:
  prepare:
    runs-on: ubuntu-latest
    outputs:
      image-name: ${{ steps.image.outputs.name }}
      tags: ${{ steps.meta.outputs.tags }}
      labels: ${{ steps.meta.outputs.labels }}
      package-name: ${{ steps.package.outputs.name }}
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

      - name: Set lowercase image name
        id: image
        run: |
          echo "name=${GITHUB_REPOSITORY,,}" >> $GITHUB_OUTPUT

      - name: Set package name
        id: package
        run: |
          echo "name=$(basename ${GITHUB_REPOSITORY,,})" >> $GITHUB_OUTPUT

      - name: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ steps.image.outputs.name }}
          tags: |
            type=ref,event=branch,enable={{is_not_default_branch}}
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=raw,value=nightly,enable={{is_default_branch}}

      - name: Compute final tags
        id: final-tags
        run: |
          readarray -t tags <<< "${{ steps.meta.outputs.tags }}"

          if [[ "${{ github.ref_type }}" == "tag" ]]; then
            tag="${{ github.ref_name }}"
            if [[ "$tag" =~ ^v?[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
              full_latest="${{ env.REGISTRY }}/${{ steps.image.outputs.name }}:latest"
              # Check if latest is already in tags to avoid duplicates
              if ! printf '%s\n' "${tags[@]}" | grep -q "^$full_latest$"; then
                tags+=("$full_latest")
              fi
            fi
          fi

          # Set multiline output
          echo "tags<<EOF" >> $GITHUB_OUTPUT
          printf '%s\n' "${tags[@]}" >> $GITHUB_OUTPUT
          echo "EOF" >> $GITHUB_OUTPUT

  build:
    needs: prepare
    runs-on: ${{ matrix.runner }}
    permissions:
      contents: read
      packages: write
    strategy:
      matrix:
        include:
          - platform: amd64
            runner: ubuntu-latest
            suffix: amd64
            cache-scope: amd64
          - platform: arm64
            runner: ubuntu-24.04-arm
            suffix: arm64
            cache-scope: arm64
    steps:
      - name: Checkout repository
        uses: actions/checkout@v4

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

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

      - name: Compute suffixed tags
        id: tags
        run: |
          readarray -t tags <<< "${{ needs.prepare.outputs.tags }}"
          suffixed=()
          for t in "${tags[@]}"; do
            suffixed+=("$t-${{ matrix.suffix }}")
          done
          echo "tags=$(IFS=','; echo "${suffixed[*]}")" >> $GITHUB_OUTPUT

      - name: Build and push Docker image
        uses: docker/build-push-action@v5
        with:
          context: .
          file: ./Dockerfile
          platforms: linux/${{ matrix.platform }}
          push: true
          tags: ${{ steps.tags.outputs.tags }}
          labels: ${{ needs.prepare.outputs.labels }}
          cache-from: type=gha,scope=${{ matrix.cache-scope }}
          cache-to: type=gha,mode=max,scope=${{ matrix.cache-scope }}
          provenance: false

  manifest:
    needs: [prepare, build]
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    steps:
      - name: Log in to GitHub Container Registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Create and push multi-arch manifest
        run: |
          readarray -t tag_array <<< "${{ needs.prepare.outputs.tags }}"

          for tag in "${tag_array[@]}"; do
            docker manifest create "$tag" \
              "$tag-amd64" \
              "$tag-arm64"
            
            docker manifest push "$tag"
          done