name: Docker Image

on:
  push:
    branches:
      - main
  workflow_dispatch:

concurrency:
  group: docker-${{ github.ref }}
  cancel-in-progress: true

env:
  REGISTRY: ghcr.io
  IMAGE_NAME: ${{ github.repository }}
  GOPROXY: https://proxy.golang.org,direct
  GOPRIVATE: github.com/Silo-Server/*
  GONOSUMDB: github.com/Silo-Server/*

jobs:
  build:
    strategy:
      fail-fast: false
      matrix:
        include:
          - platform: linux/amd64
            runner: ubuntu-latest
          - platform: linux/arm64
            runner: ubuntu-24.04-arm
    runs-on: ${{ matrix.runner }}
    permissions:
      contents: read
      packages: write

    steps:
      - name: Checkout
        uses: actions/checkout@v5

      - name: Prepare platform slug and lowercase image name
        run: |
          echo "PLATFORM_PAIR=${PLATFORM//\//-}" >> "$GITHUB_ENV"
          echo "IMAGE_LC=${IMAGE_NAME,,}" >> "$GITHUB_ENV"
        env:
          PLATFORM: ${{ matrix.platform }}

      - name: Set up pnpm
        uses: pnpm/action-setup@v4
        with:
          version: 10

      - name: Set up Node.js
        uses: actions/setup-node@v5
        with:
          node-version: "22"
          cache: "pnpm"
          cache-dependency-path: web/pnpm-lock.yaml

      - name: Install frontend dependencies
        working-directory: web
        run: pnpm install --frozen-lockfile

      - name: Build frontend assets
        working-directory: web
        run: pnpm run build

      - name: Set up Go
        uses: actions/setup-go@v6
        with:
          go-version-file: go.mod
          cache: true
          cache-dependency-path: go.sum

      - name: Reject committed local SDK replaces
        run: |
          if grep -Eq '^replace github.com/Silo-Server/silo-plugin-sdk => /' go.mod; then
            echo "go.mod contains a machine-local silo-plugin-sdk replace."
            exit 1
          fi

      - name: Validate SDK resolves from the module graph
        env:
          GOWORK: off
        run: |
          sdk_module_json="$(mktemp)"
          go list -m -json github.com/Silo-Server/silo-plugin-sdk > "$sdk_module_json"
          if grep -q '"Main": true' "$sdk_module_json"; then
            echo "silo-plugin-sdk resolved from the local workspace instead of go.mod."
            cat "$sdk_module_json"
            exit 1
          fi

      - 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: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}

      - name: Build and push by digest
        id: build
        uses: docker/build-push-action@v6
        with:
          context: .
          platforms: ${{ matrix.platform }}
          labels: ${{ steps.meta.outputs.labels }}
          build-contexts: |
            frontend_dist=./web/dist
          build-args: |
            BUILD_REVISION=${{ github.sha }}
            BUILD_DIRTY=false
          cache-from: type=gha,scope=docker-${{ env.PLATFORM_PAIR }}
          cache-to: type=gha,scope=docker-${{ env.PLATFORM_PAIR }},mode=max
          outputs: type=image,name=${{ env.REGISTRY }}/${{ env.IMAGE_LC }},push-by-digest=true,name-canonical=true,push=true

      - name: Export digest
        run: |
          mkdir -p "${RUNNER_TEMP}/digests"
          digest="${{ steps.build.outputs.digest }}"
          touch "${RUNNER_TEMP}/digests/${digest#sha256:}"

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

  merge:
    runs-on: ubuntu-latest
    needs: build
    permissions:
      packages: write

    steps:
      - name: Prepare lowercase image name
        run: echo "IMAGE_LC=${IMAGE_NAME,,}" >> "$GITHUB_ENV"

      - name: Download digests
        uses: actions/download-artifact@v4
        with:
          path: ${{ runner.temp }}/digests
          pattern: digests-*
          merge-multiple: true

      - 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: Extract metadata
        id: meta
        uses: docker/metadata-action@v5
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_LC }}
          tags: |
            type=raw,value=latest,enable={{is_default_branch}}
            type=sha,prefix=,format=short

      - name: Create and push manifest list
        working-directory: ${{ runner.temp }}/digests
        run: |
          # shellcheck disable=SC2046
          docker buildx imagetools create \
            $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
            $(printf "${REGISTRY}/${IMAGE_LC}@sha256:%s " *)

      - name: Inspect manifest list
        run: |
          docker buildx imagetools inspect "${REGISTRY}/${IMAGE_LC}:${GITHUB_SHA::7}"