name: Publish Baseline

# Builds the `:baseline` (or versioned `*-baseline`) tag of `ghcr.io/.../trawl`
# from `apps/api/Dockerfile.baseline` (Bun baseline runtime — pre-2013-CPU
# compatible). Same GHCR package as `:latest`, just a different tag.
#
# Triggers:
#   - workflow_dispatch: run manually from any branch; pick a tag via the input
#     (default: "baseline") e.g. "baseline", "1.0.0-baseline"
#   - push of `v*` tags (e.g., `v1.0.1`) -> docker tag derived as `1.0.1-baseline`.
#     publish.yml handles `:1.0.1`/`:latest` for the same push (it excludes
#     `v*-baseline` so this workflow owns the baseline half of every release).
#     This workflow also moves the rolling `:baseline` pointer.
#   - push of `v*-baseline` or `*-baseline` tags (e.g., `v1.0.1-baseline`,
#     `1.0.1-baseline`) -> docker tag mirrors the git tag (v stripped).
#     publish.yml explicitly excludes `v*-baseline` so a baseline-only release
#     does not also push `:X.Y.Z` or `:latest`. Rolling `:baseline` is moved.

on:
  workflow_dispatch:
    inputs:
      tag:
        description: 'Docker tag to push (e.g. "baseline", "1.0.0-baseline")'
        required: false
        default: 'baseline'
  push:
    tags:
      - "v*"
      - "*-baseline"

env:
  IMAGE: ghcr.io/${{ github.repository_owner }}/trawl

jobs:
  build:
    strategy:
      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:
      - uses: actions/checkout@v7

      - uses: docker/login-action@v4
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - uses: docker/setup-buildx-action@v4

      - name: Sanitize platform name
        run: |
          platform=${{ matrix.platform }}
          echo "PLATFORM_PAIR=${platform//\//-}" >> $GITHUB_ENV

      - uses: docker/build-push-action@v7
        id: build
        with:
          context: .
          file: apps/api/Dockerfile.baseline
          platforms: ${{ matrix.platform }}
          push: true
          outputs: type=image,name=${{ env.IMAGE }},push-by-digest=true,name-canonical=true,push=true
          labels: |
            org.opencontainers.image.title=trawl (baseline)
            org.opencontainers.image.description=TRAWL API on Bun baseline runtime (pre-AVX2 compatible)
          cache-from: type=gha,scope=trawl-baseline-${{ matrix.platform }}
          cache-to: type=gha,scope=trawl-baseline-${{ matrix.platform }},mode=max
          secrets: |
            GITHUB_TOKEN=${{ secrets.GITHUB_TOKEN }}

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

      - uses: actions/upload-artifact@v7
        with:
          name: digests-baseline-${{ env.PLATFORM_PAIR }}
          path: /tmp/digests/*
          if-no-files-found: error
          retention-days: 1

  merge:
    runs-on: ubuntu-latest
    needs: build
    permissions:
      contents: read
      packages: write
    steps:
      - uses: actions/download-artifact@v8
        with:
          path: /tmp/digests
          pattern: digests-baseline-*
          merge-multiple: true

      - uses: docker/login-action@v4
        with:
          registry: ghcr.io
          username: ${{ github.actor }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - uses: docker/setup-buildx-action@v4

      - name: Compute tags
        id: tags
        shell: bash
        run: |
          if [[ "${{ github.event_name }}" == "push" ]]; then
            REF="${GITHUB_REF_NAME}"
            if [[ "${REF}" =~ ^v[0-9]+\.[0-9]+\.[0-9]+$ ]]; then
              # Versioned release tag (e.g., v1.0.1) -> derive `1.0.1-baseline`.
              # publish.yml handles `:1.0.1`/`:latest` for the same push.
              TAG="${REF#v}-baseline"
            elif [[ "${REF}" =~ ^v.*-baseline$ ]]; then
              # v-prefixed baseline tag (e.g., v1.0.1-baseline) -> strip the `v`,
              # use the bare form. This is a baseline-only release: push ONLY
              # `:X.Y.Z-baseline` + `:baseline`, never `:X.Y.Z`/`:latest`
              # (publish.yml explicitly excludes `v*-baseline` so it never fires
              # for this case, leaving the baseline path exclusive to this workflow).
              TAG="${REF#v}"
            else
              # Bare baseline tag push (e.g., `1.0.1-baseline`) -> use as-is
              TAG="${REF}"
            fi
          else
            TAG="${{ inputs.tag }}"
          fi
          # Safety: baseline workflow must never push :latest
          if [[ "${TAG}" == "latest" ]]; then
            echo "::error::Baseline workflow must not push :latest — use publish.yml instead"
            exit 1
          fi
          # Build the -t args. Every baseline build also moves the rolling :baseline
          # pointer (mirrors how main pushes move :nightly) — unless the computed tag
          # already IS "baseline" (manual dispatch default), in which case dedupe.
          TAGS="-t ${IMAGE}:${TAG}"
          if [[ "${TAG}" != "baseline" ]]; then
            TAGS="${TAGS} -t ${IMAGE}:baseline"
          fi
          echo "versioned=${IMAGE}:${TAG}" >> "$GITHUB_OUTPUT"
          echo "tags=${TAGS}" >> "$GITHUB_OUTPUT"

      - name: Create and push multi-arch manifest
        working-directory: /tmp/digests
        run: |
          docker buildx imagetools create \
            ${{ steps.tags.outputs.tags }} \
            $(printf '${{ env.IMAGE }}@sha256:%s ' *)

      - name: Inspect manifest
        run: docker buildx imagetools inspect ${{ steps.tags.outputs.versioned }}