name: Build & Deploy (develop)

# Runs on:
# - Pull requests targeting develop
# - Direct pushes to develop
# main is intentionally NOT included yet (no prod target configured)
on:
  push:
    branches:
      - develop
  pull_request:
    branches:
      - develop

jobs:
  build-and-deploy:
    runs-on: ubuntu-latest

    steps:
      - name: Checkout code
        uses: actions/checkout@v4

      - name: Resolve commit SHA
        id: vars
        run: |
          # For PRs, gitea.sha is a temporary merge commit — use the real
          # PR head commit instead so tags map to actual git history.
          FULL_SHA="${{ gitea.event.pull_request.head.sha || gitea.sha }}"
          echo "sha=${FULL_SHA:0:7}" >> "$GITHUB_OUTPUT"

      - name: Build Docker image (tagged by commit SHA)
        run: |
          docker build -t robot-market:${{ steps.vars.outputs.sha }} .

      - name: Save previous tag for rollback
        run: |
          if [ -f /opt/robot-market-front/.env ]; then
            cp /opt/robot-market-front/.env /opt/robot-market-front/.env.previous
          fi

      - name: Point compose at this build
        run: |
          echo "IMAGE_TAG=${{ steps.vars.outputs.sha }}" > /opt/robot-market-front/.env

      - name: Deploy via compose
        run: |
          docker compose --env-file /opt/robot-market-front/.env \
            -f /opt/robot-market-front/docker-compose.yml \
            up -d --force-recreate

      - name: Health check (retries for ~30s)
        run: |
          for i in $(seq 1 15); do
            if docker exec robot-market node -e "
              require('http').get('http://localhost:3000', res => {
                process.exit(res.statusCode < 400 ? 0 : 1);
              }).on('error', () => process.exit(1));
            " 2>/dev/null; then
              echo "Container is healthy"
              exit 0
            fi
            echo "Not ready yet, retrying..."
            sleep 2
          done
          echo "Health check failed after 30s"
          exit 1

      - name: Roll back to previous version on failed health check
        if: failure()
        run: |
          if [ -f /opt/robot-market-front/.env.previous ]; then
            cp /opt/robot-market-front/.env.previous /opt/robot-market-front/.env
            docker compose --env-file /opt/robot-market-front/.env \
              -f /opt/robot-market-front/docker-compose.yml \
              up -d --force-recreate
            echo "Rolled back to previous image."
          else
            echo "No previous deploy recorded — nothing to roll back to."
          fi

      - name: Clean up dangling (untagged) layers only
        run: docker image prune -f
        # Note: this does NOT remove SHA-tagged images, so rollback targets
        # stay available. Periodically clean up old SHA tags manually if
        # disk usage grows (e.g. keep the last 10 builds).