name: Release

on:
  push:
    tags:
      - "v*.*.*"

env:
  REGISTRY: ghcr.io
  IMAGE_PREFIX: ghcr.io/${{ github.repository_owner }}/warmbly

jobs:
  validate-tag:
    name: Validate Tag
    runs-on: ubuntu-latest
    outputs:
      version: ${{ steps.version.outputs.version }}
      major: ${{ steps.version.outputs.major }}
      minor: ${{ steps.version.outputs.minor }}
    steps:
      - name: Extract version
        id: version
        run: |
          TAG="${{ github.ref_name }}"
          VERSION="${TAG#v}"
          echo "version=${VERSION}" >> $GITHUB_OUTPUT
          echo "major=$(echo "$VERSION" | cut -d. -f1)" >> $GITHUB_OUTPUT
          echo "minor=$(echo "$VERSION" | cut -d. -f1-2)" >> $GITHUB_OUTPUT
          echo "Release version: ${VERSION}"

  # Go services: the Dockerfiles build on $BUILDPLATFORM and cross-compile to
  # each target arch, so one amd64 runner produces both platforms without QEMU.
  build-go:
    name: Build ${{ matrix.service }}
    needs: validate-tag
    strategy:
      fail-fast: false
      matrix:
        service: [backend, consumer, worker]
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    steps:
      - uses: actions/checkout@v4

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

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

      - name: Build and push
        uses: docker/build-push-action@v6
        with:
          context: .
          file: deploy/docker/${{ matrix.service }}.Dockerfile
          push: true
          tags: |
            ${{ env.IMAGE_PREFIX }}/${{ matrix.service }}:${{ github.ref_name }}
            ${{ env.IMAGE_PREFIX }}/${{ matrix.service }}:v${{ needs.validate-tag.outputs.minor }}
            ${{ env.IMAGE_PREFIX }}/${{ matrix.service }}:v${{ needs.validate-tag.outputs.major }}
            ${{ env.IMAGE_PREFIX }}/${{ matrix.service }}:prod
          platforms: linux/amd64,linux/arm64
          cache-from: type=gha,scope=${{ matrix.service }}
          cache-to: type=gha,mode=max,scope=${{ matrix.service }}

  # Frontends (web dashboard, admin panel): the pnpm build runs once on the
  # build platform and its static output is served from nginx, so a single
  # buildx build produces both arches without a per-arch rebuild.
  build-frontend:
    name: Build ${{ matrix.service }}
    needs: validate-tag
    strategy:
      fail-fast: false
      matrix:
        service: [web, admin]
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    steps:
      - uses: actions/checkout@v4

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

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

      - name: Build and push
        uses: docker/build-push-action@v6
        with:
          context: ./${{ matrix.service }}
          file: ./${{ matrix.service }}/Dockerfile
          push: true
          tags: |
            ${{ env.IMAGE_PREFIX }}/${{ matrix.service }}:${{ github.ref_name }}
            ${{ env.IMAGE_PREFIX }}/${{ matrix.service }}:v${{ needs.validate-tag.outputs.minor }}
            ${{ env.IMAGE_PREFIX }}/${{ matrix.service }}:v${{ needs.validate-tag.outputs.major }}
            ${{ env.IMAGE_PREFIX }}/${{ matrix.service }}:prod
          platforms: linux/amd64,linux/arm64
          cache-from: type=gha,scope=${{ matrix.service }}
          cache-to: type=gha,mode=max,scope=${{ matrix.service }}

  # Rust (tracking) and Elixir (realtime) have no cross-compiler; an emulated
  # arm64 build under QEMU runs for an hour or more. Build each arch on a
  # native runner and merge the digests into one manifest (the
  # Docker-documented multi-runner pattern).
  build-native:
    name: Build ${{ matrix.service }} (${{ matrix.platform }})
    needs: validate-tag
    strategy:
      fail-fast: false
      matrix:
        service: [tracking, realtime]
        platform: [linux/amd64, linux/arm64]
    runs-on: ${{ matrix.platform == 'linux/arm64' && 'ubuntu-24.04-arm' || 'ubuntu-latest' }}
    permissions:
      contents: read
      packages: write
    steps:
      - uses: actions/checkout@v4

      - name: Prepare platform pair
        id: prep
        run: echo "pair=${PLATFORM//\//-}" >> "$GITHUB_OUTPUT"
        env:
          PLATFORM: ${{ matrix.platform }}

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

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

      - name: Build and push by digest
        id: build
        uses: docker/build-push-action@v6
        with:
          context: ${{ matrix.service == 'tracking' && './tracking' || '.' }}
          file: ${{ matrix.service == 'tracking' && './tracking/Dockerfile' || format('deploy/docker/{0}.Dockerfile', matrix.service) }}
          platforms: ${{ matrix.platform }}
          cache-from: type=gha,scope=${{ matrix.service }}-${{ steps.prep.outputs.pair }}
          cache-to: type=gha,mode=max,scope=${{ matrix.service }}-${{ steps.prep.outputs.pair }}
          outputs: type=image,name=${{ env.IMAGE_PREFIX }}/${{ matrix.service }},push-by-digest=true,name-canonical=true,push=true

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

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

  merge-native:
    name: Merge ${{ matrix.service }} manifest
    needs: [validate-tag, build-native]
    strategy:
      fail-fast: false
      matrix:
        service: [tracking, realtime]
    runs-on: ubuntu-latest
    permissions:
      contents: read
      packages: write
    steps:
      - name: Download digests
        uses: actions/download-artifact@v4
        with:
          path: /tmp/digests
          pattern: digests-${{ matrix.service }}-*
          merge-multiple: true

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

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

      - name: Create manifest list and push
        working-directory: /tmp/digests
        run: |
          docker buildx imagetools create \
            -t ${{ env.IMAGE_PREFIX }}/${{ matrix.service }}:${{ github.ref_name }} \
            -t ${{ env.IMAGE_PREFIX }}/${{ matrix.service }}:v${{ needs.validate-tag.outputs.minor }} \
            -t ${{ env.IMAGE_PREFIX }}/${{ matrix.service }}:v${{ needs.validate-tag.outputs.major }} \
            -t ${{ env.IMAGE_PREFIX }}/${{ matrix.service }}:prod \
            $(printf '${{ env.IMAGE_PREFIX }}/${{ matrix.service }}@sha256:%s ' *)

  create-release:
    name: Create GitHub Release
    needs: [validate-tag, build-go, build-frontend, merge-native]
    runs-on: ubuntu-latest
    permissions:
      contents: write
    steps:
      - uses: actions/checkout@v4
        with:
          fetch-depth: 0

      - name: Generate changelog
        id: changelog
        run: |
          PREV_TAG=$(git describe --tags --abbrev=0 HEAD^ 2>/dev/null || echo "")

          if [[ -n "$PREV_TAG" ]]; then
            echo "Generating changelog from $PREV_TAG to ${{ github.ref_name }}"
            CHANGELOG=$(git log --pretty=format:"- %s (%h)" $PREV_TAG..${{ github.ref_name }} | head -50)
          else
            echo "No previous tag found, generating from beginning"
            CHANGELOG=$(git log --pretty=format:"- %s (%h)" | head -50)
          fi

          # Escape for GitHub Actions
          CHANGELOG="${CHANGELOG//'%'/'%25'}"
          CHANGELOG="${CHANGELOG//$'\n'/'%0A'}"
          CHANGELOG="${CHANGELOG//$'\r'/'%0D'}"

          echo "changelog=${CHANGELOG}" >> $GITHUB_OUTPUT

      - name: Create Release
        uses: softprops/action-gh-release@v2
        with:
          tag_name: ${{ github.ref_name }}
          name: Release ${{ github.ref_name }}
          body: |
            ## What's Changed

            ${{ steps.changelog.outputs.changelog }}

            ## Docker Images

            All images are available at `ghcr.io/${{ github.repository_owner }}/warmbly`:

            | Service | Image |
            |---------|-------|
            | Backend | `${{ env.IMAGE_PREFIX }}/backend:${{ github.ref_name }}` |
            | Consumer | `${{ env.IMAGE_PREFIX }}/consumer:${{ github.ref_name }}` |
            | Worker | `${{ env.IMAGE_PREFIX }}/worker:${{ github.ref_name }}` |
            | Tracking | `${{ env.IMAGE_PREFIX }}/tracking:${{ github.ref_name }}` |
            | Realtime | `${{ env.IMAGE_PREFIX }}/realtime:${{ github.ref_name }}` |
            | Dashboard (web) | `${{ env.IMAGE_PREFIX }}/web:${{ github.ref_name }}` |
            | Admin | `${{ env.IMAGE_PREFIX }}/admin:${{ github.ref_name }}` |

            ## Deployment

            This release will be automatically deployed to production.
          draft: false
          prerelease: ${{ contains(github.ref_name, '-') }}
          generate_release_notes: true