#!/usr/bin/env bash
# Capture a REAL node_exporter exposition from each monitored host into tests/fixtures/.
#
# Runs node_exporter in the foreground on the remote host for a few seconds, scrapes it
# over loopback there, and saves the text. Nothing is installed as a service and no port
# is opened: the only network hop is ssh.
#
#   ./scripts/capture-node-exporter.sh                 # all hosts
#   ./scripts/capture-node-exporter.sh driveripper-ops # one host
#
# Why: metric names must be verified against the deployed exporter (see AGENTS.md), never
# guessed from the upstream README.
set -uo pipefail

VERSION="${NODE_EXPORTER_VERSION:-1.12.1}"
OUT="$(cd "$(dirname "$0")/.." && pwd)/tests/fixtures"
HOSTS=("${@:-driveripper-ops deskwork-ops gateway-ops}")
PORT=9199
ARGS="--collector.drm --collector.thermal_zone --collector.cpufreq --collector.hwmon --web.listen-address=127.0.0.1:${PORT}"

mkdir -p "$OUT"
command -v ssh >/dev/null || { echo "ssh not found"; exit 1; }

for host in $HOSTS; do
  echo "=== $host"
  ssh -n -o ConnectTimeout=10 "$host" "set -e
    mkdir -p \$HOME/exporters && cd \$HOME/exporters
    if [ ! -x node_exporter ]; then
      curl -sSL -o ne.tgz https://github.com/prometheus/node_exporter/releases/download/v${VERSION}/node_exporter-${VERSION}.linux-amd64.tar.gz
      tar xzf ne.tgz && mv node_exporter-${VERSION}.linux-amd64/node_exporter .
      rm -rf ne.tgz node_exporter-${VERSION}.linux-amd64
    fi
    timeout 8 ./node_exporter ${ARGS} >/dev/null 2>&1 &
    sleep 3
    curl -s --max-time 5 127.0.0.1:${PORT}/metrics
  " > "$OUT/node_exporter_${host}.txt" 2>/dev/null
  lines=$(wc -l < "$OUT/node_exporter_${host}.txt")
  if [ "$lines" -lt 20 ]; then
    echo "    FAILED (only $lines lines) — check ssh access to $host"
    rm -f "$OUT/node_exporter_${host}.txt"
    continue
  fi
  echo "    saved $lines lines -> tests/fixtures/node_exporter_${host}.txt"
  echo "    gpu: $(grep -cE '^node_gpu' "$OUT/node_exporter_${host}.txt") node_gpu series"
  grep -oE '^node_gpu[a-z_]*' "$OUT/node_exporter_${host}.txt" | sort -u | sed 's/^/      /' | head -20
done