name: Server image build and push

on:
  workflow_dispatch:
  schedule:
    # Every Friday at 1:00 p.m. UTC
    - cron: '0 13 * * 5'
  push:
    tags:
      - 'v[0-9]+\.[0-9]+\.[0-9]+'

env:
  REGISTRY_IMAGE: tiltedphoques/st-reborn-server

jobs:
  build:
    if: ${{ github.repository_owner == 'tiltedphoques' || github.event_name != 'schedule' }} # Disable cron runs in forks
    runs-on: ${{ matrix.runner }}
    timeout-minutes: 45
    outputs:
      version: ${{ steps.version.outputs.version }}
    strategy:
      fail-fast: false
      matrix:
        include:
          - runner: ubuntu-latest
            platform: linux/amd64
            arch: amd64
          - runner: ubuntu-24.04-arm
            platform: linux/arm64
            arch: arm64

    steps:
      - uses: actions/checkout@v6
        with:
          # We need full history in order to create a version string (BuildInfo.h)
          fetch-depth: 0

      - name: Checkout submodules
        run: |
          git submodule sync --recursive
          git submodule update --init --force --recursive --depth=1

      - name: Store version in output
        id: version
        run: echo "version=$(git describe --tags)" >> $GITHUB_OUTPUT

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

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

      - name: Build and push by digest
        id: build
        uses: docker/build-push-action@v6
        with:
          context: .
          platforms: ${{ matrix.platform }}
          outputs: type=image,name=${{ env.REGISTRY_IMAGE }},push-by-digest=true,name-canonical=true,push=true
          cache-from: type=gha,scope=${{ matrix.arch }}
          cache-to: type=gha,mode=max,scope=${{ matrix.arch }}
          labels: |
            org.opencontainers.image.title=Skyrim Together Server
            org.opencontainers.image.description=Dedicated server for the Skyrim Together multiplayer mod
            org.opencontainers.image.url=https://skyrim-together.com
            org.opencontainers.image.source=${{ github.server_url }}/${{ github.repository }}
            org.opencontainers.image.revision=${{ github.sha }}
            org.opencontainers.image.version=${{ steps.version.outputs.version }}

      - name: Export digest
        run: |
          mkdir -p /tmp/digests
          digest="${{ steps.build.outputs.digest }}"
          echo "${digest#sha256:}" > "/tmp/digests/${{ matrix.arch }}"

      - name: Upload digest
        uses: actions/upload-artifact@v4
        with:
          name: digests-${{ matrix.runner }}
          path: /tmp/digests/*
          if-no-files-found: error
          retention-days: 1

  # Combine images into multi-arch manifest (x86-64 and arm) and push
  merge-and-push:
    needs: build
    runs-on: ubuntu-latest
    timeout-minutes: 5

    steps:
      - name: Download digests
        uses: actions/download-artifact@v4
        with:
          path: /tmp/digests
          pattern: digests-*
          merge-multiple: true

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

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

      - name: Generate metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY_IMAGE }}
          tags: |
            type=schedule,pattern=weekly-latest
            type=semver,pattern={{version}}
            type=raw,value=${{ needs.build.outputs.version }},enable=${{ github.event_name == 'workflow_dispatch' }}

      - name: Create manifest list and push
        run: |
          docker buildx imagetools create \
            ${{ steps.meta.outputs.tags && format('-t {0}', join(fromJSON(steps.meta.outputs.json).tags, ' -t ')) }} \
            ${{ env.REGISTRY_IMAGE }}@sha256:$(cat /tmp/digests/amd64) \
            ${{ env.REGISTRY_IMAGE }}@sha256:$(cat /tmp/digests/arm64)