#!/usr/bin/env bash
set -euo pipefail

ROOT="$(cd "$(dirname "${BASH_SOURCE[0]}")/.." && pwd)"
CHECKPOINT=""
RUN_NAME=""
GPUS="${CUDA_VISIBLE_DEVICES:-0,1,2,3,4,5,6}"
STAGGER="${STATEPLAY_RANK_LOAD_STAGGER_SECONDS:-8}"
EXTRA_ARGS=()

while [[ $# -gt 0 ]]; do
  case "$1" in
    --checkpoint) CHECKPOINT="$2"; shift 2 ;;
    --run-name) RUN_NAME="$2"; shift 2 ;;
    --gpus) GPUS="$2"; shift 2 ;;
    --stagger-seconds) STAGGER="$2"; shift 2 ;;
    --) shift; EXTRA_ARGS+=("$@"); break ;;
    *) EXTRA_ARGS+=("$1"); shift ;;
  esac
done

if [[ -z "$CHECKPOINT" || -z "$RUN_NAME" ]]; then
  echo "usage: $0 --checkpoint PATH --run-name NAME [--gpus 0,1,...] [-- extra generator args]" >&2
  exit 2
fi

IFS=',' read -r -a GPU_LIST <<< "$GPUS"
NUM_SHARDS="${#GPU_LIST[@]}"
LOG_DIR="$ROOT/evaluation/proxy100/logs/$RUN_NAME"
mkdir -p "$LOG_DIR"

pids=()
cleanup() {
  for pid in "${pids[@]:-}"; do kill "$pid" 2>/dev/null || true; done
}
trap cleanup INT TERM

for shard in "${!GPU_LIST[@]}"; do
  gpu="${GPU_LIST[$shard]}"
  (
    sleep "$((shard * STAGGER))"
    export CUDA_VISIBLE_DEVICES="$gpu"
    python "$ROOT/scripts/generate_proxy_benchmark.py" \
      --checkpoint "$CHECKPOINT" \
      --run-name "$RUN_NAME" \
      --shard-index "$shard" \
      --num-shards "$NUM_SHARDS" \
      --skip-existing \
      "${EXTRA_ARGS[@]}"
  ) >"$LOG_DIR/shard_${shard}.log" 2>&1 &
  pids+=("$!")
  echo "started shard=$shard gpu=$gpu pid=${pids[-1]} log=$LOG_DIR/shard_${shard}.log"
done

failed=0
for pid in "${pids[@]}"; do
  if ! wait "$pid"; then failed=1; fi
done
trap - INT TERM
if [[ "$failed" -ne 0 ]]; then
  echo "one or more inference shards failed; inspect $LOG_DIR" >&2
  exit 1
fi
echo "all $NUM_SHARDS shards completed for $RUN_NAME"