name: smoke

# Launch the real Waybar binary inside a headless sway compositor and verify it
# starts, renders, and matches a reference screenshot. Complements the unit
# tests and build jobs, which never actually run the bar.

on: [push, pull_request]

concurrency:
  group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
  cancel-in-progress: true

jobs:
  smoke:
    runs-on: ubuntu-latest
    steps:
      - uses: actions/checkout@v6

      - name: Install dependencies
        run: |
          sudo apt-get update
          sudo apt-get install --no-install-recommends -y \
            sway grim imagemagick fonts-dejavu-core \
            meson ninja-build g++ pkg-config scdoc wayland-protocols \
            gobject-introspection libdbusmenu-gtk3-dev libevdev-dev libfmt-dev \
            libgirepository1.0-dev libgtk-3-dev libgtkmm-3.0-dev libinput-dev \
            libjsoncpp-dev libmpdclient-dev libnl-3-dev libnl-genl-3-dev \
            libpulse-dev libsigc++-2.0-dev libspdlog-dev libwayland-dev \
            upower libxkbregistry-dev libxkbcommon-dev

      - name: Build & install Waybar
        run: |
          meson setup build -Dman-pages=disabled
          ninja -C build
          sudo ninja -C build install

      # --- Level 1: smoke with real modules ---
      - name: Smoke — real modules load without crashing
        run: ./test/smoke/run.sh test/smoke/modules-config.jsonc

      # --- Level 1 + 2: launch deterministic config and screenshot ---
      - name: Launch + screenshot (deterministic config)
        run: ./test/smoke/run.sh test/smoke/config.jsonc test/smoke/style.css bar.png

      # --- Level 2: the bar actually rendered something ---
      - name: Check the bar is not blank
        run: |
          sd=$(convert bar.png -crop 1920x30+0+0 +repage -colorspace Gray \
                 -format '%[fx:standard_deviation]' info:)
          echo "bar strip stddev = $sd"
          awk "BEGIN{ exit !($sd > 0.01) }" || {
            echo "::error::the top bar strip looks blank — Waybar rendered nothing"
            exit 1
          }

      # --- Level 3: golden comparison against the committed reference ---
      - name: Compare against reference screenshot
        run: |
          if [ -f test/smoke/reference.png ]; then
            ae=$(compare -metric AE -fuzz 8% test/smoke/reference.png bar.png diff.png 2>&1 || true)
            ae=$(printf '%s' "$ae" | grep -oE '^[0-9]+' || echo 0)
            echo "differing pixels (fuzz 8%): $ae"
            if [ "$ae" -gt 800 ]; then
              echo "::error::visual regression: $ae pixels differ from the reference (threshold 800). See the 'diff.png' artifact."
              exit 1
            fi
            echo "✓ within tolerance"
          else
            echo "::warning::No reference image yet. Download the 'waybar-screenshot' artifact from this run and commit bar.png as test/smoke/reference.png to enable golden comparison."
          fi

      - name: Upload screenshots
        uses: actions/upload-artifact@v4
        if: always()
        with:
          name: waybar-screenshot
          path: |
            bar.png
            diff.png
          if-no-files-found: warn