#!/usr/bin/env bash
# SPDX-FileCopyrightText: Copyright (c) 2024-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
# SPDX-License-Identifier: Apache-2.0

# This script installs vLLM and its dependencies from PyPI (release versions only).
# Installation order:
# 1. LMCache (installed first so vLLM's dependencies take precedence)
# 2. vLLM
# 3. DeepGEMM
# 4. EP kernels

set -euo pipefail

VLLM_VER="0.13.0"
VLLM_REF="v${VLLM_VER}"

# Basic Configurations
ARCH=$(uname -m)
MAX_JOBS=16
INSTALLATION_DIR=/tmp

# VLLM and Dependency Configurations
TORCH_CUDA_ARCH_LIST="9.0;10.0" # For EP Kernels -- TODO: check if we need to add 12.0+PTX
DEEPGEMM_REF=""
CUDA_VERSION="12.9"
FLASHINF_REF="v0.5.3"
LMCACHE_REF="0.3.12"

while [[ $# -gt 0 ]]; do
    case $1 in
        --vllm-ref)
            VLLM_REF="$2"
            shift 2
            ;;
        --max-jobs)
            MAX_JOBS="$2"
            shift 2
            ;;
        --arch)
            ARCH="$2"
            shift 2
            ;;
        --installation-dir)
            INSTALLATION_DIR="$2"
            shift 2
            ;;
        --deepgemm-ref)
            DEEPGEMM_REF="$2"
            shift 2
            ;;
        --flashinf-ref)
            FLASHINF_REF="$2"
            shift 2
            ;;
        --lmcache-ref)
            LMCACHE_REF="$2"
            shift 2
            ;;
        --torch-cuda-arch-list)
            TORCH_CUDA_ARCH_LIST="$2"
            shift 2
            ;;
        --cuda-version)
            CUDA_VERSION="$2"
            shift 2
            ;;
        -h|--help)
            echo "Usage: $0 [--vllm-ref REF] [--max-jobs NUM] [--arch ARCH] [--deepgemm-ref REF] [--flashinf-ref REF] [--lmcache-ref REF] [--torch-cuda-arch-list LIST] [--cuda-version VERSION]"
            echo "Options:"
            echo "  --vllm-ref REF      vLLM release version (default: ${VLLM_REF})"
            echo "  --max-jobs NUM      Maximum parallel jobs (default: ${MAX_JOBS})"
            echo "  --arch ARCH         Architecture amd64|arm64 (default: auto-detect)"
            echo "  --installation-dir DIR  Install directory (default: ${INSTALLATION_DIR})"
            echo "  --deepgemm-ref REF  DeepGEMM git ref (default: ${DEEPGEMM_REF})"
            echo "  --flashinf-ref REF  FlashInfer version (default: ${FLASHINF_REF})"
            echo "  --lmcache-ref REF   LMCache version (default: ${LMCACHE_REF})"
            echo "  --torch-cuda-arch-list LIST  CUDA architectures (default: ${TORCH_CUDA_ARCH_LIST})"
            echo "  --cuda-version VERSION  CUDA version (default: ${CUDA_VERSION})"
            exit 0
            ;;
        *)
            echo "Unknown option: $1"
            exit 1
            ;;
    esac
done

# Convert x86_64 to amd64 for consistency with Docker ARG
if [ "$ARCH" = "x86_64" ]; then
    ARCH="amd64"
elif [ "$ARCH" = "aarch64" ]; then
    ARCH="arm64"
fi

export MAX_JOBS=$MAX_JOBS
export CUDA_HOME=/usr/local/cuda

# Derive torch backend from CUDA version (e.g., "12.9" -> "cu129")
TORCH_BACKEND="cu$(echo $CUDA_VERSION | tr -d '.')"
CUDA_VERSION_MAJOR=${CUDA_VERSION%%.*}

echo "=== Installing prerequisites ==="
uv pip install pip cuda-python

echo "\n=== Configuration Summary ==="
echo "  VLLM_REF=$VLLM_REF | ARCH=$ARCH | CUDA_VERSION=$CUDA_VERSION | TORCH_BACKEND=$TORCH_BACKEND"
echo "  TORCH_CUDA_ARCH_LIST=$TORCH_CUDA_ARCH_LIST | INSTALLATION_DIR=$INSTALLATION_DIR"

if [[ "$CUDA_VERSION_MAJOR" == "12" ]]; then
    echo "  FLASHINF_REF=$FLASHINF_REF | LMCACHE_REF=$LMCACHE_REF | DEEPGEMM_REF=$DEEPGEMM_REF"
    echo "\n=== Installing LMCache ==="
    if [ "$ARCH" = "amd64" ]; then
        # LMCache installation currently fails on arm64 due to CUDA dependency issues
        # Install LMCache BEFORE vLLM so vLLM's dependencies take precedence
        uv pip install lmcache==${LMCACHE_REF} --torch-backend=${TORCH_BACKEND}
        echo "✓ LMCache ${LMCACHE_REF} installed"
    else
        echo "⚠ Skipping LMCache on ARM64 (compatibility issues)"
    fi
else
    echo "  FLASHINF_REF=$FLASHINF_REF | LMCache will not be installed as it doesn't support CUDA 13 yet | DEEPGEMM_REF=$DEEPGEMM_REF"
fi


echo "\n=== Cloning vLLM repository ==="
# Clone needed for DeepGEMM and EP kernels install scripts
cd $INSTALLATION_DIR
git clone https://github.com/vllm-project/vllm.git vllm
cd vllm
git checkout $VLLM_REF
# TODO: remove this cherry-pick when vllm is upgraded to > 0.12.0 (when the fix is shipped)
git cherry-pick --no-commit 799804d140fc99ce3964648ba91aaa810cf28fef # nvshmem fix for CUDA 13.0
echo "✓ vLLM repository cloned"


echo "\n=== Installing vLLM & FlashInfer ==="
if [[ "$CUDA_VERSION_MAJOR" == "12" ]]; then
    echo "Installing vLLM $VLLM_REF from PyPI..."
    uv pip install vllm[flashinfer,runai]==$VLLM_REF --torch-backend=${TORCH_BACKEND}
    uv pip install flashinfer-cubin==$FLASHINF_REF
    uv pip install flashinfer-jit-cache==$FLASHINF_REF --extra-index-url https://flashinfer.ai/whl/${TORCH_BACKEND}
elif [[ "$CUDA_VERSION_MAJOR" == "13" ]]; then
    if [ "$ARCH" = "amd64" ]; then
        echo "Installing vLLM $VLLM_REF from GitHub since CUDA 13 x86_64 wheel is only present on GitHub..."
        uv pip install \
            --index-strategy=unsafe-best-match \
            --extra-index-url https://download.pytorch.org/whl/${TORCH_BACKEND} \
            https://github.com/vllm-project/vllm/releases/download/v${VLLM_VER}/vllm-${VLLM_VER}+${TORCH_BACKEND}-cp38-abi3-manylinux_2_31_x86_64.whl[flashinfer,runai] \
            --torch-backend=${TORCH_BACKEND}
        uv pip install flashinfer-cubin==$FLASHINF_REF
        uv pip install flashinfer-jit-cache==$FLASHINF_REF --extra-index-url https://flashinfer.ai/whl/${TORCH_BACKEND}
        echo "✓ vLLM installation completed"
    else
        echo "⚠ Skipping LMCache on ARM64 (compatibility issues, missing aarch64 wheels)"
        echo "Building vLLM from source for ${ARCH} architecture..."
        echo "Try to install specific PyTorch and other dependencies first"
        uv pip install --index-strategy=unsafe-best-match --index https://download.pytorch.org/whl/ -r requirements/cuda.txt
        uv pip install setuptools_scm # required to build vLLM from source
        MAX_JOBS=${MAX_JOBS} uv pip install -v --no-build-isolation .
    fi
else
    echo "❌ Unsupported CUDA version for vLLM installation: ${CUDA_VERSION}"
    exit 1
fi
echo "✓ vLLM installation completed"

echo "\n=== Installing DeepGEMM ==="
cd $INSTALLATION_DIR/vllm/tools
if [ -n "$DEEPGEMM_REF" ]; then
    bash install_deepgemm.sh --cuda-version "${CUDA_VERSION}" --ref "$DEEPGEMM_REF"
else
    bash install_deepgemm.sh --cuda-version "${CUDA_VERSION}"
fi
echo "✓ DeepGEMM installation completed"

echo "\n=== Installing EP Kernels (PPLX and DeepEP) ==="
cd ep_kernels/
# TODO we will be able to specify which pplx and deepep commit we want in future
TORCH_CUDA_ARCH_LIST="$TORCH_CUDA_ARCH_LIST" bash install_python_libraries.sh

echo "\n✅ All installations completed successfully!"
