# Runs only on pushes to main.
#
# The runner runs in the same swarm as Forgejo with /var/run/docker.sock mounted,
# so it can build images and update swarm services directly — no SSH needed.
#
# Required secrets (repo → Settings → Secrets → Actions):
#   REGISTRY_USER    — your Forgejo username
#   REGISTRY_TOKEN   — Forgejo PAT with write:packages scope
#   DEPLOY_SERVICE   — full swarm service name, e.g. fabledassistant_app
name: Build & Deploy

on:
  push:
    branches: [main]

env:
  REGISTRY: git.fabledsword.com
  IMAGE: git.fabledsword.com/bvandeusen/fabledassistant

jobs:
  build:
    name: Build & push image
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v4

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

      - name: Log in to Forgejo registry
        uses: docker/login-action@v3
        with:
          registry: ${{ env.REGISTRY }}
          username: ${{ secrets.REGISTRY_USER }}
          password: ${{ secrets.REGISTRY_TOKEN }}

      - name: Build and push
        uses: docker/build-push-action@v6
        with:
          context: .
          push: true
          tags: |
            ${{ env.IMAGE }}:latest
            ${{ env.IMAGE }}:${{ github.sha }}
          # Registry-side layer cache — unchanged layers (npm install, pip install)
          # are reused between builds. Cuts typical build time from ~4 min to ~45 sec.
          cache-from: type=registry,ref=${{ env.IMAGE }}:cache
          cache-to: type=registry,ref=${{ env.IMAGE }}:cache,mode=max

  deploy:
    name: Deploy
    needs: build
    runs-on: ubuntu-latest
    steps:
      - name: Log in to registry
        run: |
          echo "${{ secrets.REGISTRY_TOKEN }}" | \
            docker login git.fabledsword.com -u "${{ secrets.REGISTRY_USER }}" --password-stdin

      - name: Update swarm service
        # --with-registry-auth forwards the login credentials to all swarm nodes
        # so they can pull the new image. --detach=false waits for the rollout to
        # complete before the job finishes (shows progress in the Actions log).
        run: |
          docker service update \
            --image ${{ env.IMAGE }}:${{ github.sha }} \
            --with-registry-auth \
            --detach=false \
            ${{ secrets.DEPLOY_SERVICE }}

      - name: Clean up old images
        run: docker image prune -f