#!/usr/bin/env bash
set -euo pipefail
root="$(cd -- "$(dirname -- "${BASH_SOURCE[0]}")/.." && pwd)"; mode=test
if [[ "${1:-}" == --build-only || "${1:-}" == --trace ]]; then mode="${1#--}"; shift; fi
task="${1:?task required}"; case "$task" in task01_pin_polarity|task02_bringup_blinker|task03_programming_gate) ;; *) exit 2 ;; esac
state="${STEM_STATE_DIR:-$root/.stem/instances/local}"; profile="${STEM_PROFILE:-hazard3-sim}"; target="${STEM_TARGET:-hazard3-baremetal}"; build_dir="$state/build/rtl/$task"; artifact_dir="$root/.stem/artifacts/$profile/$target/$task"; binary="$build_dir/sim"; mkdir -p "$build_dir" "$artifact_dir"
args=(--binary --timing --assert -Wall -Wno-fatal -Wno-DECLFILENAME -Wno-BLKSEQ -Wno-UNUSEDSIGNAL -Wno-WIDTH --top-module tb --Mdir "$build_dir/obj" -o "$binary" "$root/src/tasks/$task.sv" "$root/tests/${task}_tb.sv"); [[ "$mode" == trace ]] && args+=(--trace)
verilator "${args[@]}" >/dev/null; cp -f "$root/src/tasks/$task.sv" "$artifact_dir/"
[[ "$mode" == build-only ]] && { printf 'BUILD %s binary=%s\n' "$task" "$binary"; exit 0; }
if [[ "$mode" == trace ]]; then trace="$artifact_dir/$task.vcd"; "$binary" "+trace=$trace"; test -s "$trace"; printf 'TRACE %s vcd=%s\n' "$task" "$trace"; else "$binary"; fi