. "$BST_LIB"
# libstatgrab on wasm32-hwjs glibc: reads system statistics (CPU, memory,
# load, network, disk) via /proc/stat, /proc/meminfo, /proc/net/dev,
# /proc/mounts, /proc/loadavg -- all present on this machine.
#
# statgrab outputs key=value lines with dot-separated group.field names,
# e.g. cpu.user, mem.total, load.min1, general.hostname.
# Without an interval argument it takes one sample and exits.
#
# saidar is the ncurses companion; it is installed and its binary is
# executable but cannot be driven non-interactively, so its presence is
# all that is asserted.
require statgrab libstatgrab/present

# has <id> <needle> <text> -- assert a captured sample contains a literal.
has() {
  case "$3" in *"$2"*) bst_ok "$1" ;;
  *) bst_notok "$1" "no '$2' in capture" ;; esac
}

# --- identity and inventory --------------------------------------------------
# statgrab has no --version flag; the version appears in the pkg-config file.
_ver=$(pkg-config --modversion libstatgrab 2>/dev/null)
if [ "$_ver" = "0.92.1" ]; then bst_ok libstatgrab/version
else bst_notok libstatgrab/version "pkg-config modversion='$_ver' want='0.92.1'"; fi

[ -x /usr/bin/statgrab ] && bst_ok libstatgrab/statgrab-present \
  || bst_notok libstatgrab/statgrab-present "/usr/bin/statgrab not executable"
[ -x /usr/bin/saidar ] && bst_ok libstatgrab/saidar-present \
  || bst_notok libstatgrab/saidar-present "/usr/bin/saidar not executable"

# Library file: shared (.so*) on glibc targets; wasm32 links statically so
# only libstatgrab.a ships -- accept either.
_lib=$(find /usr/lib -name "libstatgrab.so*" -o -name "libstatgrab.a" 2>/dev/null | head -1)
if [ -n "$_lib" ]; then bst_ok libstatgrab/library
else bst_notok libstatgrab/library "no libstatgrab.so* or libstatgrab.a under /usr/lib"; fi

# --- one-shot sample ---------------------------------------------------------
# Capture the full stat dump once; assert each category's key-value block.
_sg=$(statgrab 2>&1)
_rc=$?
if [ "$_rc" -eq 0 ]; then bst_ok libstatgrab/run
else bst_notok libstatgrab/run "statgrab exited $_rc"; fi

# CPU stats: user/kernel/idle counters (sourced from /proc/stat).
# Key format: cpu.<field>
has libstatgrab/cpu-user   "cpu.user"   "$_sg"
has libstatgrab/cpu-kernel "cpu.kernel" "$_sg"
has libstatgrab/cpu-idle   "cpu.idle"   "$_sg"

# Memory stats (sourced from /proc/meminfo).
# Key format: mem.<field>
has libstatgrab/mem-total "mem.total" "$_sg"
has libstatgrab/mem-free  "mem.free"  "$_sg"

# Load averages (sourced from /proc/loadavg).
# Key format: load.<field>
has libstatgrab/load "load.min1" "$_sg"

# Network stats for the loopback interface (sourced from /proc/net/dev).
# Key format: net.<iface>.<field> -- lo is always present.
has libstatgrab/net "net.lo." "$_sg"

# Host info: uptime and hostname live under the "general" group.
has libstatgrab/host-uptime   "general.uptime"   "$_sg"
has libstatgrab/host-hostname "general.hostname" "$_sg"

# Selective invocation: only memory and load groups.
# Group selectors require a trailing dot (they prefix-match against "mem.", "load.", etc.).
_ml=$(statgrab mem. load. 2>&1)
has libstatgrab/selective-mem  "mem.total"  "$_ml"
has libstatgrab/selective-load "load.min1"  "$_ml"
# CPU keys must not appear when only mem and load are requested.
case "$_ml" in *"cpu.user"*) bst_notok libstatgrab/selective-cpu-absent "cpu.user present in mem+load output" ;;
  *) bst_ok libstatgrab/selective-cpu-absent ;; esac