name: Docker

on:
  push:
    branches:
      - "master"
    tags:
      - "v*"

permissions:
  contents: read
  packages: write

jobs:
  build-and-push:
    runs-on: ubuntu-latest
    timeout-minutes: 60
    concurrency:
      group: docker-${{ github.ref }}
      cancel-in-progress: true
    steps:
      - name: Checkout
        uses: actions/checkout@v7

      - name: Login to GitHub Container Registry
        uses: docker/login-action@v4
        with:
          registry: ghcr.io
          username: ${{ github.repository_owner }}
          password: ${{ secrets.GITHUB_TOKEN }}

      - name: Set up Docker Buildx
        uses: docker/setup-buildx-action@v4

      # Deployment tooling reads these labels from the registry to verify an
      # image's schema expectations against a migrator before deploying it,
      # without pulling the image. The server refuses to start when the
      # database is missing bundled migrations, so orchestrators need a cheap
      # way to check image/migrator compatibility up front.
      - name: Compute schema migration labels
        id: schema
        run: |
          set -euo pipefail
          last=$(ls packages/db/src/migrations/*.sql | sed 's|.*/||' | LC_ALL=C sort | tail -1)
          count=$(ls packages/db/src/migrations/*.sql | wc -l | tr -d ' ')
          echo "last=${last}" >> "$GITHUB_OUTPUT"
          echo "count=${count}" >> "$GITHUB_OUTPUT"

      - name: Docker meta
        id: meta
        uses: docker/metadata-action@v6
        with:
          images: ghcr.io/${{ github.repository }}
          tags: |
            type=raw,value=latest,enable={{is_default_branch}}
            type=semver,pattern={{version}}
            type=semver,pattern={{major}}.{{minor}}
            type=sha
          labels: |
            io.github.paperclipai.schema.last-migration=${{ steps.schema.outputs.last }}
            io.github.paperclipai.schema.migration-count=${{ steps.schema.outputs.count }}

      - name: Build and push
        uses: docker/build-push-action@v7
        with:
          context: .
          platforms: linux/amd64,linux/arm64
          push: true
          cache-from: type=gha
          cache-to: type=gha,mode=max
          tags: ${{ steps.meta.outputs.tags }}
          labels: ${{ steps.meta.outputs.labels }}