# Register the Pi runner with the label solar-relay:host.
# Install the systemd unit and the restricted sudoers rule described in README.md once.
name: Deploy Solar Relay

on:
  push:
    branches:
      - main
  workflow_dispatch:

jobs:
  deploy:
    runs-on: solar-relay

    env:
      DEPLOY_PATH: /var/www/html/solar-relay
      SERVICE: solar-relay.service
      HEALTH_URL: https://rpioffice.nest.lutran.ch/solar-relay/healthz

    steps:
      - name: Checkout
        uses: actions/checkout@v4
        with:
          persist-credentials: false

      - name: Check runner and deployment setup
        shell: bash
        run: |
          set -euo pipefail
          command -v python3
          command -v rsync
          command -v sudo
          command -v systemctl
          command -v flock
          command -v curl
          python3 -c 'import sys, tomllib; assert sys.version_info >= (3, 11)'
          test -d "$DEPLOY_PATH"
          test -w "$DEPLOY_PATH"
          python3 - <<'PY'
          import os
          from pathlib import Path
          checkout = Path.cwd().resolve()
          deployment = Path(os.environ['DEPLOY_PATH']).resolve()
          if checkout == deployment or checkout in deployment.parents or deployment in checkout.parents:
              raise SystemExit('The runner checkout and deployment directory must not overlap')
          PY
          test -r /etc/solar-relay/config.toml
          cmp deploy/solar-relay.service /etc/systemd/system/solar-relay.service || {
            echo 'Install the updated deploy/solar-relay.service and run systemctl daemon-reload first.'
            exit 1
          }
          sudo -n -l "$(command -v systemctl)" restart "$SERVICE" >/dev/null

      - name: Create isolated test environment
        run: |
          python3 -m venv .venv-ci
          .venv-ci/bin/python -m pip install --only-binary=pyarrow -r requirements.txt

      - name: Run tests
        run: .venv-ci/bin/python -m unittest discover -s tests -v

      - name: Deploy and restart
        shell: bash
        run: |
          set -euo pipefail
          # Also serializes deployments on Gitea versions that lack workflow concurrency.
          exec 9>"$DEPLOY_PATH/.deploy.lock"
          flock -w 120 9
          rsync -azc --no-times --delete \
            --exclude '/.git/' \
            --exclude '/.gitea/' \
            --exclude '/.venv/' \
            --exclude '/.venv-ci/' \
            --exclude '/.deploy.lock' \
            --exclude '/config.toml' \
            --exclude '/.env' \
            --exclude '/data/' \
            --exclude '__pycache__/' \
            --exclude '*.parquet' \
            ./ "$DEPLOY_PATH/"
          if [ ! -x "$DEPLOY_PATH/.venv/bin/python" ]; then
            python3 -m venv "$DEPLOY_PATH/.venv"
          fi
          "$DEPLOY_PATH/.venv/bin/python" -c 'import sys; assert sys.version_info >= (3, 11)'
          "$DEPLOY_PATH/.venv/bin/python" -m pip install --only-binary=pyarrow -r "$DEPLOY_PATH/requirements.txt"
          sudo -n "$(command -v systemctl)" restart "$SERVICE"
          # Catch an invalid config or missing token that triggers an immediate restart loop.
          sleep 10
          if ! systemctl is-active --quiet "$SERVICE"; then
            systemctl status "$SERVICE" --no-pager --lines 30 || true
            exit 1
          fi
          if [ "$(systemctl show --property=NRestarts --value "$SERVICE")" != "0" ]; then
            echo 'The collector restarted unexpectedly after deployment.'
            systemctl status "$SERVICE" --no-pager --lines 30 || true
            exit 1
          fi
          systemctl status "$SERVICE" --no-pager --lines 10
          curl --fail --silent --show-error --connect-timeout 3 --max-time 5 \
            --retry 4 --retry-delay 2 "$HEALTH_URL"