#!/usr/bin/env bash
# One-shot setup for a fresh 8xB200 node. Idempotent: safe to re-run.
#
#   bash /code/users/alexsu/project/fastkernels/setup_node.sh
#
# Everything this touches except /code is node-local and disappears when the
# node is recycled, which is why this script exists.
set -uo pipefail
set -x

LDAP=alexsu
REPO="/code/users/${LDAP}/project/fastkernels"
TOKEN_FILE="/code/users/${LDAP}/hf_token"

# 1. Fail fast if the GPUs aren't visible.
nvidia-smi -L || { echo "GPU not visible, aborting"; exit 1; }

# 2. Convenience symlinks.
ln -sfn /data-fast "${HOME}/data-fast"
ln -sfn "/code/users/${LDAP}" "${HOME}/${LDAP}"
ln -sfn "${REPO}" "${HOME}/fastkernels"

# 3. HF token: the copy on FSX is the source of truth.
mkdir -p /data-fast/huggingface
cp "${TOKEN_FILE}" /data-fast/huggingface/token
chmod 600 /data-fast/huggingface/token

# 4. Shell env.
if ! grep -q "FASTKERNELS_ENV_SETUP" "${HOME}/.bashrc"; then
cat >> "${HOME}/.bashrc" <<'BASHRC_EOF'

# --- FASTKERNELS_ENV_SETUP ---
ulimit -c 0
export HF_HOME=/home/yak/data-fast/huggingface
export HF_XET_HIGH_PERFORMANCE=1
export CPLUS_INCLUDE_PATH="/usr/local/cuda/include/cccl:${CPLUS_INCLUDE_PATH:-}"
export C_INCLUDE_PATH="/usr/local/cuda/include/cccl:${C_INCLUDE_PATH:-}"
export FASTKERNELS_RESULTS_DIR=/code/users/alexsu/vllm-validate
export FK_VENV_ROOT=/data-fast/fk-venvs
export UV_CACHE_DIR=/data-fast/uv-cache
# Drop the K8s service vars; vLLM tries to parse anything named VLLM_*.
unset $(env | cut -d= -f1 | grep -E '^(SOYOUNG_)?(VLLM|QWEN)_[A-Z0-9]+_.*(SERVICE|PORT)') 2>/dev/null
# --- end ---
BASHRC_EOF
fi

# 5. GitHub over 443; port 22 is blocked on this cluster. The github.com block
#    must come before the Host * wildcard or it never applies.
mkdir -p "${HOME}/.ssh"; touch "${HOME}/.ssh/config"
if ! grep -q '^Host github.com' "${HOME}/.ssh/config"; then
    { printf 'Host github.com\n    HostName ssh.github.com\n    Port 443\n    ForwardAgent yes\n\n';
      cat "${HOME}/.ssh/config"; } > "${HOME}/.ssh/config.new"
    mv "${HOME}/.ssh/config.new" "${HOME}/.ssh/config"
    chmod 600 "${HOME}/.ssh/config"
fi
ssh -T -o StrictHostKeyChecking=accept-new git@github.com || true

# 6. Directories: results on FSX, venvs and uv cache on the node-local disk.
mkdir -p "/code/users/${LDAP}/vllm-validate" /data-fast/fk-venvs /data-fast/uv-cache
export UV_CACHE_DIR=/data-fast/uv-cache

# 7. Repo (persists on FSX, so this is a no-op after the first node).
if [ ! -d "${REPO}/.git" ]; then
    git clone --recursive ssh://git@github.com/Snowflake-AI-Research/fastkernels.git "${REPO}"
fi
cd "${REPO}"

# 8. Dependencies. pyproject pins torch/vllm/transformers and the ABI-matched
#    flash-attn wheel, so `-e .` is all that's needed -- but deep-gemm builds
#    without build isolation, so torch has to already be importable.
uv pip install torch==2.11.0
uv pip install -e .

set +x
echo "=== verify ==="
python -c "import torch, vllm, flash_attn, fastkernels, transformers; \
print('torch', torch.__version__, '| cuda?', torch.cuda.is_available(), torch.cuda.device_count()); \
print('vllm', vllm.__version__, '| fa', flash_attn.__version__, '| hf', transformers.__version__)"
echo "=== done. open a new shell (exec bash -l) before running anything. ==="