# Runs only on pushes to main.
# Builds the Docker image on the CI runner host (which has Docker socket access),
# pushes it to the Forgejo container registry, then SSHes to the app host to restart.
#
# Runner requirement: act_runner with /var/run/docker.sock mounted (see infra/runner-swarm.yml).
#
# Required secrets (Forgejo repo → Settings → Secrets):
#   REGISTRY_USER      — your Forgejo username (bvandeusen)
#   REGISTRY_TOKEN     — Forgejo personal access token with write:packages scope
#   DEPLOY_HOST        — IP or hostname of the server running fabledassistant
#   DEPLOY_USER        — SSH user on that server
#   DEPLOY_SSH_KEY     — private SSH key (matching public key must be in authorized_keys on app host)
#   DEPLOY_PATH        — absolute path to the directory with docker-compose.yml on the app host
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 lives in the Forgejo container registry.
          # Unchanged layers (npm install, pip install) are reused across builds,
          # cutting typical build time from ~4 min to ~45 sec after the first run.
          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: Pull new image and restart app
        uses: appleboy/ssh-action@v1
        with:
          host: ${{ secrets.DEPLOY_HOST }}
          username: ${{ secrets.DEPLOY_USER }}
          key: ${{ secrets.DEPLOY_SSH_KEY }}
          # Pulls only the app service image, restarts only the app container.
          # Database and Ollama containers are left untouched (--no-deps).
          script: |
            set -e
            echo "${{ secrets.REGISTRY_TOKEN }}" | \
              docker login git.fabledsword.com -u "${{ secrets.REGISTRY_USER }}" --password-stdin
            cd "${{ secrets.DEPLOY_PATH }}"
            docker compose pull app
            docker compose up -d --no-build --no-deps app
            docker image prune -f