name: Build Slint (self-hosted)

# Builds qbz-slint on the self-hosted runner registered on the dev box
# (`qbz-box`, labels: self-hosted,linux,x64,qbz-builder). The box CAN compile
# qbz-slint (proven locally), so this is the reliable path to a real CI/CD
# artifact while the GitHub-hosted private runner (2 vCPU / 8 GB) cannot.
#
# Self-hosted runners keep their work directory between runs, so `target/`
# persists → builds are INCREMENTAL after the first (no `actions/cache` needed).
#
# MANUAL trigger only (workflow_dispatch): the box shares RAM with the desktop
# and earlyoom will SIGTERM the build if RAM runs low. Trigger this when the box
# is free (close heavy apps / TTY), and do NOT run a local build at the same
# time (one heavy build at a time — the box hard-freezes on double-build OOM).

on:
  workflow_dispatch:

concurrency:
  group: selfhosted-slint
  cancel-in-progress: true

jobs:
  build:
    runs-on: [self-hosted, qbz-builder]
    timeout-minutes: 180
    steps:
      - uses: actions/checkout@v7

      - name: Free RAM check (earlyoom will kill the build if too low)
        run: |
          free -h | head -2
          avail=$(free -m | awk '/^Mem:/ {print $7}')
          echo "MemAvailable: ${avail} MB"
          if [ "${avail}" -lt 16000 ]; then
            echo "::warning::Only ${avail} MB free — earlyoom may SIGTERM the qbz-slint rustc. Close apps / drop to TTY for headroom."
          fi

      # Desktop-proof recipe, root-caused 2026-07-04 (ftrace): earlyoom's
      # RAM-only trigger SIGTERM'd rustc whenever global MemAvailable dipped
      # to ~3 GB — the cap margin, not the settings, was the bug. With
      # slint-run.sh anchoring memory.high at avail-9G, this exact recipe
      # (threads=2, cgu=256, opt=3, capped) completed with a 5.7 GB global
      # floor and zero signals while the desktop ran. Same flags as the
      # distribution profile → the runner cache stays warm between runs.
      - name: Build qbz-slint (desktop-proof — capped, threads=2, opt-3)
        run: NORUN=1 CAPPED=1 THREADS=2 CODEGEN_UNITS=256 OPT=3 ./scripts/slint-run.sh

      - name: Strip + report size
        run: |
          BIN=crates/target/release/qbz
          echo "unstripped:"; ls -lh "$BIN" | awk '{print $5}'
          cp "$BIN" qbz-linux-x86_64
          strip qbz-linux-x86_64 || true
          echo "stripped:"; ls -lh qbz-linux-x86_64 | awk '{print $5}'

      - uses: actions/upload-artifact@v7
        with:
          name: qbz-linux-x86_64
          path: qbz-linux-x86_64
          if-no-files-found: error