#!/usr/bin/env bash
# render_opl.sh — render tunes through OPL3 FM (authentic Sound Blaster
# flavour, no soundfont). Usage:
#   ./tools/render_opl.sh [tune.mid ...]     (default: all midi/*.mid)
#   OPL_MODEL=4 ./tools/render_opl.sh ...    (4 = Apogee/Duke Nukem volumes)
#
# Volume models: 2 NativeOPL3 (id-style)  3 DMX (Doom, default)
#                4 APOGEE (Duke Nukem 3D)  8 AIL  10 HMI
set -euo pipefail
cd "$(dirname "$0")/.."
[ -x tools/opl/render_opl ] || ./tools/opl/build.sh
mkdir -p build/opl
MODEL="${OPL_MODEL:-3}"

files=("$@")
if [ ${#files[@]} -eq 0 ]; then files=(midi/*.mid); fi

for f in "${files[@]}"; do
    dur=$(python3 -c "
import sys; sys.path.insert(0,'lib')
from midikit import read
print(read('$f')['duration_sec'] + 3)")
    out="build/opl/$(basename "${f%.mid}").wav"
    echo "== $f -> $out (model $MODEL)"
    ./tools/opl/render_opl "$f" "$out" "$dur" "$MODEL"
    python3 tools/check_wav.py "$out" "$dur"
done