#!/bin/sh
# fptrial.sh -- a labelled verification protocol against fingerprintd.
#
#   fptrial.sh [correct_taps] [wrong_taps]     defaults 10 and 5
#
# Runs fprintd-verify once per tap and tells you which finger to use before
# each one. The daemon's transcript records every frame; THIS records the label
# and the wall-clock time from "press now" to the client seeing a result, which
# is the latency a user feels. Unlabelled runs cannot be turned into a rate.
C=${1:-10}; W=${2:-5}
OUT=/tmp/fptrial-$(date +%Y%m%d-%H%M%S).log
now() { awk '{gsub(/\./,""); print $1 "0000000"}' /proc/uptime; }
run() {  # $1 = label
    printf '\n>>> %s -- press and LIFT (quick tap) ... ' "$1"
    t0=$(now)
    res=$(timeout 20 fprintd-verify user 2>&1 | grep -E 'Verify result' | tail -1)
    t1=$(now)
    ms=$(( (t1 - t0) / 1000000 ))
    verdict=$(printf '%s' "$res" | grep -oE 'verify-(match|no-match|unknown-error)' || echo timeout)
    printf '%s  (%d ms)\n' "$verdict" "$ms"
    printf '%s %s %d\n' "$1" "$verdict" "$ms" >> "$OUT"
    sleep 1
}
echo "labelled trial -> $OUT"
i=1; while [ $i -le $C ]; do run "CORRECT $i/$C"; i=$((i+1)); done
echo; echo "===== now switch to a DIFFERENT finger ====="; sleep 3
i=1; while [ $i -le $W ]; do run "WRONG $i/$W"; i=$((i+1)); done
echo
echo "===== summary ====="
awk '$1=="CORRECT"{c++; if($3=="verify-match")cm++; ct+=$4}
     $1=="WRONG"  {w++; if($3=="verify-match")wm++; wt+=$4}
     END{printf "  correct finger: %d/%d matched  (false negatives %d)  mean %d ms\n", cm,c,c-cm,(c?ct/c:0);
         printf "  wrong finger:   %d/%d matched  (false ACCEPTS %d)   mean %d ms\n", wm,w,wm,(w?wt/w:0)}' "$OUT"
echo "  per-tap log: $OUT"