name: Docker Publish

on:
  push:
    branches: ["main"]
    tags: ["v*.*.*"]
  pull_request:
    branches: ["main"]
  
env:
  REGISTRY: ghcr.io
  # github.repository as <account>/<repo>
  IMAGE_NAME: ${{ github.repository }}

jobs:
  ci-gate:
    name: CI Gate
    uses: ./.github/workflows/ci.yml

  build-frontend:
    needs: ci-gate
    runs-on: ${{ matrix.runner }}
    permissions:
      contents: read
      packages: write
      id-token: write

    strategy:
      fail-fast: false
      matrix:
        include:
          - platform: linux/amd64
            runner: ubuntu-latest
          - platform: linux/arm64
            runner: ubuntu-24.04-arm

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

      - name: Lowercase image name
        run: echo "IMAGE_NAME=${IMAGE_NAME,,}" >> $GITHUB_ENV

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3.0.0

      - name: Log into registry ${{ env.REGISTRY }}
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v3.0.0
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@v5.0.0
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}-frontend

      - name: Build and push Docker image by digest
        id: build
        uses: docker/build-push-action@v5.0.0
        with:
          context: ./frontend
          platforms: ${{ matrix.platform }}
          push: ${{ github.event_name != 'pull_request' }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha,scope=frontend-${{ matrix.platform }}
          cache-to: type=gha,mode=max,scope=frontend-${{ matrix.platform }}
          outputs: type=image,name=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}-frontend,push-by-digest=true,name-canonical=true,push=${{ github.event_name != 'pull_request' }}

      - name: Export digest
        if: github.event_name != 'pull_request'
        run: |
          mkdir -p /tmp/digests/frontend
          digest="${{ steps.build.outputs.digest }}"
          touch "/tmp/digests/frontend/${digest#sha256:}"

      - name: Upload digest
        if: github.event_name != 'pull_request'
        uses: actions/upload-artifact@v4
        with:
          name: digests-frontend-${{ matrix.platform == 'linux/amd64' && 'amd64' || 'arm64' }}
          path: /tmp/digests/frontend/*
          if-no-files-found: error
          retention-days: 1

  merge-frontend:
    runs-on: ubuntu-latest
    if: github.event_name != 'pull_request'
    needs: build-frontend
    permissions:
      contents: read
      packages: write

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

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

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3.0.0

      - name: Log into registry ${{ env.REGISTRY }}
        uses: docker/login-action@v3.0.0
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@v5.0.0
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}-frontend
          tags: |
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=raw,value=latest,enable={{is_default_branch}}

      - name: Create and push manifest
        working-directory: /tmp/digests/frontend
        run: |
          docker buildx imagetools create \
            $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
            $(printf '${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}-frontend@sha256:%s ' *)

  build-backend:
    needs: ci-gate
    runs-on: ${{ matrix.runner }}
    permissions:
      contents: read
      packages: write
      id-token: write

    strategy:
      fail-fast: false
      matrix:
        include:
          - platform: linux/amd64
            runner: ubuntu-latest
          - platform: linux/arm64
            runner: ubuntu-24.04-arm

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

      - name: Lowercase image name
        run: echo "IMAGE_NAME=${IMAGE_NAME,,}" >> $GITHUB_ENV

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3.0.0

      - name: Log into registry ${{ env.REGISTRY }}
        if: github.event_name != 'pull_request'
        uses: docker/login-action@v3.0.0
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@v5.0.0
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}-backend

      - name: Build and push Docker image by digest
        id: build
        uses: docker/build-push-action@v5.0.0
        with:
          context: .
          file: ./backend/Dockerfile
          platforms: ${{ matrix.platform }}
          push: ${{ github.event_name != 'pull_request' }}
          labels: ${{ steps.meta.outputs.labels }}
          cache-from: type=gha,scope=backend-${{ matrix.platform }}
          cache-to: type=gha,mode=max,scope=backend-${{ matrix.platform }}
          outputs: type=image,name=${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}-backend,push-by-digest=true,name-canonical=true,push=${{ github.event_name != 'pull_request' }}

      - name: Export digest
        if: github.event_name != 'pull_request'
        run: |
          mkdir -p /tmp/digests/backend
          digest="${{ steps.build.outputs.digest }}"
          touch "/tmp/digests/backend/${digest#sha256:}"

      - name: Upload digest
        if: github.event_name != 'pull_request'
        uses: actions/upload-artifact@v4
        with:
          name: digests-backend-${{ matrix.platform == 'linux/amd64' && 'amd64' || 'arm64' }}
          path: /tmp/digests/backend/*
          if-no-files-found: error
          retention-days: 1

  merge-backend:
    runs-on: ubuntu-latest
    if: github.event_name != 'pull_request'
    needs: build-backend
    permissions:
      contents: read
      packages: write

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

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

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v3.0.0

      - name: Log into registry ${{ env.REGISTRY }}
        uses: docker/login-action@v3.0.0
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Extract Docker metadata
        id: meta
        uses: docker/metadata-action@v5.0.0
        with:
          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}-backend
          tags: |
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=raw,value=latest,enable={{is_default_branch}}

      - name: Create and push manifest
        working-directory: /tmp/digests/backend
        run: |
          docker buildx imagetools create \
            $(jq -cr '.tags | map("-t " + .) | join(" ")' <<< "$DOCKER_METADATA_OUTPUT_JSON") \
            $(printf '${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}-backend@sha256:%s ' *)