#!/usr/bin/env bash
# scripts/launch.sh — launch a single training run, detached via nohup.
#
# Usage:
#   bash scripts/launch.sh [condition] [n_train] [seed] [gpu]
#
# Defaults:
#   condition = grokking
#   n_train   = 500
#   seed      = 42
#   gpu       = 0
#
# Survives SSH disconnects. All artifacts in experiments/runs/<run_id>/.

set -euo pipefail

ROOT="$(cd "$(dirname "$0")/.." && pwd)"
cd "${ROOT}"
source "${ROOT}/scripts/lib/nohup_runner.sh"
source "${ROOT}/scripts/lib/env.sh"
resolve_python

CONDITION="${1:-grokking}"
N_TRAIN="${2:-500}"
SEED="${3:-42}"
GPU="${4:-0}"
WANDB_MODE_ARG="${WANDB_MODE:-online}"   # online|offline|disabled
EXTRA_ARGS="${EXTRA_ARGS:-}"             # extra trainer flags pass-through
                                         # e.g. EXTRA_ARGS="--spurious_rho 0.8 --weight_decay 5e-3"
RUN_TAG="${RUN_TAG:-}"                   # extra slug inserted into the run_id between
                                         # <condition> and n<N>. Caller-controlled because
                                         # the launcher pre-creates the run_dir before the
                                         # trainer can self-tag.
                                         # e.g. RUN_TAG=spurious08  RUN_TAG=spurious095_ps10

STAMP="$(date -u +%Y%m%d-%H%M%S)"
TAG_INFIX=""
[[ -n "${RUN_TAG}" ]] && TAG_INFIX="_${RUN_TAG}"
RUN_ID="${STAMP}_${CONDITION}${TAG_INFIX}_n${N_TRAIN}_s${SEED}"
RUN_DIR="experiments/runs/${RUN_ID}"

mkdir -p "${RUN_DIR}"/{logs,results,checkpoints,figures}

echo "Launching CausalGrok run"
echo "  condition : ${CONDITION}"
echo "  n_train   : ${N_TRAIN}"
echo "  seed      : ${SEED}"
echo "  GPU       : ${GPU}"
echo "  run_id    : ${RUN_ID}"

# Build the trainer argv. EXTRA_ARGS is intentionally unquoted so it
# word-splits into individual flags (env vars cannot carry arrays).
read -r -a _extra <<<"${EXTRA_ARGS}"

CUDA_VISIBLE_DEVICES="${GPU}" launch_detached "${RUN_DIR}" \
    "${PYTHON}" -u -m experiments.causalgrok_baseline \
        --condition  "${CONDITION}" \
        --n_train    "${N_TRAIN}" \
        --seed       "${SEED}" \
        --run_dir    "${RUN_DIR}" \
        --wandb_project causalgrok \
        --wandb_mode "${WANDB_MODE_ARG}" \
        "${_extra[@]}"