name: Publish Docker image

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

permissions:
  contents: read

env:
  IMAGE_NAME: pichost

jobs:
  build:
    if: ${{ !contains(github.event.head_commit.message, '[skip docker]') }}
    strategy:
      fail-fast: false
      matrix:
        include:
          - platform: linux/amd64
            runner: ubuntu-latest
            suffix: amd64
          - platform: linux/arm64
            runner: ubuntu-24.04-arm
            suffix: arm64
    runs-on: ${{ matrix.runner }}
    env:
      DOCKERHUB_USERNAME: ${{ secrets.DOCKERHUB_USERNAME }}
      DOCKERHUB_TOKEN: ${{ secrets.DOCKERHUB_TOKEN }}
    steps:
      - name: Checkout
        uses: actions/checkout@v7

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

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

      - name: Resolve version
        id: version
        run: |
          if [ "${{ github.ref_type }}" = "tag" ]; then
            echo "value=${GITHUB_REF#refs/tags/v}" >> "$GITHUB_OUTPUT"
          else
            echo "value=dev" >> "$GITHUB_OUTPUT"
          fi

      - name: Build and push platform image
        uses: docker/build-push-action@v6
        with:
          context: .
          push: true
          platforms: ${{ matrix.platform }}
          tags: |
            ${{ env.DOCKERHUB_USERNAME }}/${{ env.IMAGE_NAME }}:${{ steps.version.outputs.value }}-${{ matrix.suffix }}
          cache-from: type=gha,scope=${{ matrix.suffix }}
          cache-to: type=gha,mode=max,scope=${{ matrix.suffix }}

  merge:
    if: ${{ !contains(github.event.head_commit.message, '[skip docker]') }}
    needs: build
    runs-on: ubuntu-latest
    env:
      DOCKERHUB_USERNAME: ${{ secrets.DOCKERHUB_USERNAME }}
      DOCKERHUB_TOKEN: ${{ secrets.DOCKERHUB_TOKEN }}
    steps:
      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3

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

      - name: Resolve version
        id: version
        run: |
          if [ "${{ github.ref_type }}" = "tag" ]; then
            echo "value=${GITHUB_REF#refs/tags/v}" >> "$GITHUB_OUTPUT"
          else
            echo "value=dev" >> "$GITHUB_OUTPUT"
          fi

      - name: Create multi-arch manifest
        run: |
          IMAGE="${DOCKERHUB_USERNAME}/${IMAGE_NAME}"
          VERSION="${{ steps.version.outputs.value }}"
          docker buildx imagetools create \
            -t "${IMAGE}:${VERSION}" \
            -t "${IMAGE}:latest" \
            "${IMAGE}:${VERSION}-amd64" \
            "${IMAGE}:${VERSION}-arm64"