#!/usr/bin/env bash
# bench.sh — race fastwc against GNU coreutils wc on standard input, fed by
# shell redirect (the same path every real pipeline uses). Counts must agree
# with coreutils' stdin behavior, and fastwc must not be slower.
# Busybox wc is raced too, for shits and giggles.
# Fails fast: the moment fastwc is slower than (or disagrees with) an
# oracle wc, a human readable report is written to FAILED-benchmark.txt
# and this script exits non-zero.
#
# usage: ./bench.sh
set -u

SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
REPO_DIR="$(cd "$SCRIPT_DIR/../../.." && pwd)"
source "$REPO_DIR/benchmarks/std.sh"

checkfastwc
checkwc

for oracle in $ORACLES; do
    select_oracle "$oracle" || exit 1

    printf 'benchmarking %s wc vs fastwc: stdin (%s interleaved runs each, minimum kept)\n' \
        "$BENCH_NAME" "$BENCH_REPS"
    printf '%-28s %16s %24s %8s %s\n' 'test' 'wc' 'fastwc (µs)' 'ratio' 'status'

    printf '%s\n' '--- stdin lines ---'
    if ! run_stdin_cases lines -l 10000 100000 1000000 10000000; then
        exit 1
    fi

    printf '%s\n' '--- stdin words ---'
    if ! run_stdin_cases words -w 1000 100000 1000000; then
        exit 1
    fi

    printf '%s\n' '--- stdin lines+words+bytes ---'
    if ! run_stdin_cases lines -lwc 1000000; then
        exit 1
    fi

    printf '\nall %s stdin benchmarks passed — fastwc was never slower than %s wc\n' \
        "$BENCH_NAME" "$BENCH_NAME"
done