#!/usr/bin/env bash
# Diagnose gpu-fan port conflicts and running instances.
set -euo pipefail

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
STACK_DIR="$(cd "${SCRIPT_DIR}/.." && pwd)"

OPT_ENV="/opt/control-plane/.env"
REPO_ENV="${STACK_DIR}/../control-plane/.env"

echo "=== gpu-fan status ==="
echo ""

if systemctl list-unit-files gpu-fan.service &>/dev/null; then
  echo "systemd:"
  systemctl is-active gpu-fan 2>/dev/null && systemctl status gpu-fan --no-pager -l 2>/dev/null | head -8 || echo "  inactive"
else
  echo "systemd: gpu-fan.service not installed"
fi
echo ""

echo "Ports 8090–8099:"
if ss -tlnp 2>/dev/null | grep -E ':809[0-9]' ; then
  :
elif ss -tln 2>/dev/null | grep -E ':809[0-9]' ; then
  echo "  (run as root for process names: sudo ss -tlnp)"
else
  echo "  (none listening)"
fi
echo ""

echo "gpu-fan processes:"
pgrep -af '/opt/gpu-fan/.venv/bin/python|stacks/gpu-fan/.venv/bin/python|gpu-fan/app.py' 2>/dev/null \
  || echo "  (none)"
echo ""

echo "Shell suspended jobs (Ctrl+Z):"
if jobs -l 2>/dev/null | grep -q .; then
  jobs -l
  echo "  Kill with: kill %<job-number>"
else
  echo "  (none in this shell)"
fi
echo ""

echo "GPU_FAN_API_PORT config:"
[[ -f "${OPT_ENV}" ]] && echo "  /opt/control-plane/.env:  $(grep '^GPU_FAN_API_PORT=' "${OPT_ENV}" || echo '(not set)')"
[[ -f "${REPO_ENV}" ]] && echo "  repo control-plane:       $(grep '^GPU_FAN_API_PORT=' "${REPO_ENV}" || echo '(not set)')"
echo "  Note: production uses /opt/control-plane/.env (shared with Server UI)"
echo ""

if [[ "${1:-}" == "--cleanup" ]]; then
  if [[ "${EUID}" -ne 0 ]]; then
    echo "ERROR: --cleanup requires root: sudo ${SCRIPT_DIR}/status.sh --cleanup"
    exit 1
  fi
  echo "=== cleanup ==="
  systemctl stop gpu-fan 2>/dev/null || true
  pkill -f '/opt/gpu-fan/.venv/bin/python /opt/gpu-fan/app.py' 2>/dev/null || true
  pkill -f 'stacks/gpu-fan/.venv/bin/python app.py' 2>/dev/null || true
  sleep 0.5
  if ss -tln 2>/dev/null | grep -qE ':809[0-9]'; then
    echo "WARNING: ports still in use:"
    ss -tlnp 2>/dev/null | grep -E ':809[0-9]' || ss -tln | grep -E ':809[0-9]'
    echo "Check suspended jobs in other shells: jobs -l"
  else
    echo "Ports 809x are free."
  fi
  echo ""
  echo "Start production instance:"
  echo "  sudo systemctl start gpu-fan"
  echo "Or foreground debug (systemd stopped):"
  echo "  sudo ${SCRIPT_DIR}/start.sh"
fi