#!/usr/bin/env bash
# TRACE study main entry. Run ONE of these per node (within ~30 min of each
# other; the nodes wait for one another at a barrier):
#
#   ./run_study.sh <rank> check       ONLY the fail-fast connectivity pass
#   ./run_study.sh <rank> overnight   the time-boxed study (schedule_5node_overnight.json)
#   ./run_study.sh <rank> day2        one-start day2 study (~18h35m);
#                                      validates itself before continuing
#   ./run_study.sh <rank> day2-test   internal startup-validation schedule
#   ./run_study.sh <rank>             full study (schedule_3node.json)
#   ./run_study.sh <rank> 5node       full study incl. the H200 pair
#   ./run_study.sh <rank> test        ~10 min end-to-end test, tiny jobs
#   ./run_study.sh <rank> local       single-node 4-GPU contrast set
#   ./run_study.sh <rank> <schedule.json>       explicit schedule
#
# Day2 uses an integrated five-node startup validation. Other modes retain the
# standalone connectivity pass; set SKIP_NETCHECK=1 to bypass that older pass.
#
# Needs: ./setup.sh done, and nodes.conf filled in (copy nodes.conf.example).
# Produces: trace-study-result-<node>-<time>.tar.gz next to this script.
set -euo pipefail
HERE="$(cd "$(dirname "$0")" && pwd)"
RANK="${1:?usage: ./run_study.sh <rank> [check|overnight|day2|day2-test|test|local|schedule.json]}"
SEL="${2:-full}"
RUN_TAG="standard"
STARTUP_SCHED=""
STARTUP_VERIFIER=""
case "$SEL" in
  full)      SCHED="$HERE/schedule_3node.json" ;;
  5node)     SCHED="$HERE/schedule_5node.json" ;;
  overnight) SCHED="$HERE/schedule_5node_overnight.json" ;;
  day2)      SCHED="$HERE/schedule_day2.json"; RUN_TAG="day2"
             STARTUP_SCHED="$HERE/schedule_day2_test.json"
             STARTUP_VERIFIER="$HERE/verify_day2.py" ;;
  day2-test) SCHED="$HERE/schedule_day2_test.json"; RUN_TAG="day2-test" ;;
  test)      SCHED="$HERE/schedule_test.json" ;;
  local)     SCHED="$HERE/schedule_1node_4gpu.json" ;;
  check)     SCHED="" ;;
  *)         SCHED="$SEL" ;;
esac
[[ -f "$HERE/nodes.conf" ]] || { echo "nodes.conf missing (copy nodes.conf.example)"; exit 1; }
if [[ "$SEL" == "day2" ]]; then
  [[ -f "$HERE/DAY2-CODE-SHA256SUMS" ]] \
    || { echo "DAY2-CODE-SHA256SUMS missing; refusing to run"; exit 2; }
  (
    cd "$HERE"
    sha256sum -c DAY2-CODE-SHA256SUMS >/dev/null
  ) || { echo "day2 overlay integrity check failed; refusing to run"; exit 2; }
  echo "== day2 code integrity check passed"
fi
# shellcheck disable=SC1091
source "$HERE/venv/bin/activate"

if [[ "$RUN_TAG" == "standard" ]]; then
  OUT="$HERE/out"
  SCRATCH="$HERE/scratch"
else
  RUN_INSTANCE="$(date -u +%Y%m%d-%H%M%S)"
  OUT="$HERE/out-$RUN_TAG-$RUN_INSTANCE"
  SCRATCH="$HERE/scratch-$RUN_TAG-$RUN_INSTANCE"
fi
mkdir -p "$OUT" "$SCRATCH"

# The earlier standalone five-node network check had a listener-lifetime race
# on this cluster. Day2 instead pins the configured IPv4 interface and proves
# the actual barrier/DDP paths in its automatic opening phase.
if [[ "$SEL" == "day2" ]]; then
  echo "== one-start day2: startup validation is automatic"
elif [[ "${SKIP_NETCHECK:-0}" != "1" ]]; then
  echo "== connectivity check (nothing is started until this passes)"
  if ! python3 "$HERE/orchestrator.py" --connectivity-check \
        --rank "$RANK" --nodes "$HERE/nodes.conf" \
        2>&1 | tee -a "$OUT/netcheck_rank$RANK.log"; then
    echo
    echo "== ABORTED: the nodes cannot talk to each other over the addresses"
    echo "   in nodes.conf. Nothing was started, nothing was disturbed."
    exit 4
  fi
else
  echo "== connectivity check skipped (SKIP_NETCHECK=1)"
fi
if [[ "$SEL" == "check" ]]; then
  echo "== check only; not starting the study."
  exit 0
fi
[[ -f "$SCHED" ]] || { echo "schedule not found: $SCHED"; exit 1; }

echo "== starting passive collector"
TRACE_OUTDIR="$OUT" "$HERE/collector/trace.sh" start

echo "== running schedule $(basename "$SCHED") as rank $RANK"
ORCH_EXTRA=()
if [[ -n "$STARTUP_SCHED" ]]; then
  ORCH_EXTRA+=(
    --startup-schedule "$STARTUP_SCHED"
    --startup-verifier "$STARTUP_VERIFIER"
  )
fi
set +e
python3 "$HERE/orchestrator.py" \
    --rank "$RANK" --nodes "$HERE/nodes.conf" --schedule "$SCHED" \
    "${ORCH_EXTRA[@]}" \
    ${TRACE_END_BY:+--end-by "$TRACE_END_BY"} \
    --out "$OUT" --scratch "$SCRATCH" 2>&1 | tee -a "$OUT/orchestrator_rank$RANK.log"
ORC_RC=${PIPESTATUS[0]}
set -e

if [[ "$SEL" == "day2-test" || "$SEL" == "day2" ]]; then
  VERIFY_MODE="shakedown"
  [[ "$SEL" == "day2" ]] && VERIFY_MODE="full"
  echo "== verifying $VERIFY_MODE ground truth and job telemetry"
  set +e
  python3 "$HERE/verify_day2.py" \
    --out "$OUT" --rank "$RANK" --mode "$VERIFY_MODE"
  VERIFY_RC=$?
  set -e
  if [[ "$VERIFY_RC" -ne 0 ]]; then
    if [[ "$SEL" == "day2-test" ]]; then
      echo "== shakedown verification failed (rc=$VERIFY_RC); do not start day2 yet"
    else
      echo "== full verification found a problem (rc=$VERIFY_RC); the data will still be packaged"
    fi
    [[ "$ORC_RC" -ne 0 ]] || ORC_RC=$VERIFY_RC
  fi
fi

echo "== stopping collector and packaging results (orchestrator rc=$ORC_RC)"
TRACE_OUTDIR="$OUT" "$HERE/collector/trace.sh" stop

if [[ "$RUN_TAG" == "standard" ]]; then
  TAR="$HERE/trace-study-result-$(hostname -s)-$(date -u +%Y%m%d-%H%M%S).tar.gz"
else
  TAR="$HERE/trace-study-$RUN_TAG-result-$(hostname -s)-$(date -u +%Y%m%d-%H%M%S).tar.gz"
fi
mv "$HERE"/collector/trace-data-*.tar.gz "$TAR" 2>/dev/null \
  || tar -czf "$TAR" -C "$OUT" .
echo "== cleaning scratch (checkpoints / generated data stay on the node only during the run)"
rm -rf "$SCRATCH"

echo
echo "== DONE. Please return this one file per node:"
ls -lh "$TAR"
exit "$ORC_RC"