#!/usr/bin/env bash
# make_variant.sh — generate a spin-rate preset of the ConstantSpinner adversary.
#
#   make_variant.sh <NAME> <TURN_RATE_DEG_PER_TICK> <SPEED> [OUTDIR]
#
# e.g.
#   make_variant.sh ConstantSpinner_s3 3 5 /tmp/tr_spinners
#   make_variant.sh ConstantSpinner_s6 6 5 /tmp/tr_spinners
#
# The variant dir is a normal Tank Royale bot directory named <NAME>: the runner
# matches the connecting bot's identity against <OUTDIR>/<NAME>/<NAME>.json, so
# the launcher exports BOT_JSON to make the binary handshake under <NAME>.
#
# The single committed ConstantSpinner binary is reused (no per-variant build);
# only SPIN_TURN_RATE / SPIN_SPEED differ.
set -euo pipefail

HERE="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
BIN="$HERE/out/ConstantSpinner"

NAME="${1:?usage: make_variant.sh <NAME> <TURN_RATE> <SPEED> [OUTDIR]}"
TURN="${2:?usage: make_variant.sh <NAME> <TURN_RATE> <SPEED> [OUTDIR]}"
SPEED="${3:?usage: make_variant.sh <NAME> <TURN_RATE> <SPEED> [OUTDIR]}"
OUTDIR="${4:-/tmp/tr_spinners}"

[[ -x "$BIN" ]] || { echo "ERROR: build first: nim c -d:release src/ConstantSpinner.nim" >&2; exit 1; }

DIR="$OUTDIR/$NAME"
mkdir -p "$DIR"

cat > "$DIR/$NAME.json" <<JSON
{
  "name": "$NAME",
  "version": "0.1.0",
  "authors": ["Davide Cappellini"],
  "description": "ConstantSpinner preset: constant turn ${TURN} deg/tick at speed ${SPEED}",
  "homepage": "",
  "countryCodes": ["IT"],
  "gameTypes": ["classic", "1v1"],
  "platform": "Nim",
  "programmingLang": "Nim"
}
JSON

cat > "$DIR/$NAME.sh" <<SH
#!/bin/sh
cd "\$(dirname "\$0")"
export BOT_JSON="$DIR/$NAME.json"
export SPIN_TURN_RATE="$TURN"
export SPIN_SPEED="$SPEED"
exec "$BIN" 2>> /tmp/constantspinner_stderr.log
SH
chmod +x "$DIR/$NAME.sh"

echo "generated $DIR (turn=$TURN deg/tick, speed=$SPEED)"