#!/bin/bash
# SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
# SPDX-License-Identifier: Apache-2.0
#
# EPD (Encode-Prefill-Decode) multimodal deployment
#
# Architecture: 3-component disaggregation
# - Processor: Python-based preprocessor (bypasses Rust OpenAIPreprocessor)
# - Encode Worker: Dedicated vision encoder that extracts image embeddings
# - PD Worker: Standard prefill/decode worker that receives embeddings via NIXL
#
# Benefits: Decouples encoding from inference, enables independent scaling
# For standard single-worker deployment, see agg_multimodal.sh

set -e
trap 'echo Cleaning up...; kill 0' EXIT

# Default values
MODEL_NAME="llava-hf/llava-1.5-7b-hf"
PROMPT_TEMPLATE="USER: <image>\n<prompt> ASSISTANT:"
PROVIDED_PROMPT_TEMPLATE=""
SINGLE_GPU=false

# Parse command line arguments
while [[ $# -gt 0 ]]; do
    case $1 in
        --model)
            MODEL_NAME=$2
            shift 2
            ;;
        --prompt-template)
            PROVIDED_PROMPT_TEMPLATE=$2
            shift 2
            ;;
        --single-gpu)
            SINGLE_GPU=true
            shift
            ;;
        -h|--help)
            echo "Usage: $0 [OPTIONS]"
            echo "Options:"
            echo "  --model <model_name> Specify the model to use (default: $MODEL_NAME)"
            echo "  --prompt-template <template> Specify the multi-modal prompt template to use. LLaVA 1.5 7B, Qwen2.5-VL, and Phi3V models have predefined templates."
            echo "  --single-gpu         Run both encode and PD workers on GPU 0 (for pre-merge CI)"
            echo "  -h, --help           Show this help message"
            exit 0
            ;;
        *)
            echo "Unknown option: $1"
            echo "Use --help for usage information"
            exit 1
            ;;
    esac
done

# Set PROMPT_TEMPLATE based on the MODEL_NAME
if [[ -n "$PROVIDED_PROMPT_TEMPLATE" ]]; then
    PROMPT_TEMPLATE="$PROVIDED_PROMPT_TEMPLATE"
elif [[ "$MODEL_NAME" == "llava-hf/llava-1.5-7b-hf" ]]; then
    PROMPT_TEMPLATE="USER: <image>\n<prompt> ASSISTANT:"
elif [[ "$MODEL_NAME" == "microsoft/Phi-3.5-vision-instruct" ]]; then
    PROMPT_TEMPLATE="<|user|>\n<|image_1|>\n<prompt><|end|>\n<|assistant|>\n"
elif [[ "$MODEL_NAME" == "Qwen/Qwen2.5-VL-7B-Instruct" ]] || [[ "$MODEL_NAME" == "Qwen/Qwen2-VL-2B-Instruct" ]]; then
    PROMPT_TEMPLATE="<|im_start|>system\nYou are a helpful assistant.<|im_end|>\n<|im_start|>user\n<|vision_start|><|image_pad|><|vision_end|><prompt><|im_end|>\n<|im_start|>assistant\n"
else
    echo "No multi-modal prompt template is defined for the model: $MODEL_NAME"
    echo "Please provide a prompt template using --prompt-template option."
    echo "Example: --prompt-template 'USER: <image>\n<prompt> ASSISTANT:'"
    exit 1
fi

# Start frontend (HTTP endpoint)
# dynamo.frontend accepts either --http-port flag or DYN_HTTP_PORT env var (defaults to 8000)
python -m dynamo.frontend &

# Set GPU memory utilization and model length based on deployment mode
# Single-GPU mode: Both workers share GPU 0, so use reduced memory settings
# Multi-GPU mode: Each worker gets its own GPU, so use higher memory settings
EXTRA_ARGS=""
if [[ "$SINGLE_GPU" == "true" ]]; then
    EXTRA_ARGS="--gpu-memory-utilization 0.3 --max-model-len 3072 --enforce-eager"
else
    # Multi-GPU mode: standard memory settings
    EXTRA_ARGS="--gpu-memory-utilization 0.85 --max-model-len 4096"
fi

# Start processor (Python-based preprocessing, handles prompt templating)
python -m dynamo.vllm --multimodal-processor --enable-multimodal --model $MODEL_NAME --mm-prompt-template "$PROMPT_TEMPLATE" &

# run E/P/D workers
# Use single GPU (GPU 0) for pre-merge CI, otherwise use GPU 0 for encode and GPU 1 for PD
if [[ "$SINGLE_GPU" == "true" ]]; then
    # Single GPU mode: both workers share GPU 0 with reduced memory
    CUDA_VISIBLE_DEVICES=0 python -m dynamo.vllm --multimodal-encode-worker --enable-multimodal --model $MODEL_NAME $EXTRA_ARGS &
    CUDA_VISIBLE_DEVICES=0 python -m dynamo.vllm --multimodal-worker --enable-multimodal --enable-mm-embeds --model $MODEL_NAME $EXTRA_ARGS &
else
    CUDA_VISIBLE_DEVICES=0 python -m dynamo.vllm --multimodal-encode-worker --enable-multimodal --model $MODEL_NAME $EXTRA_ARGS &
    CUDA_VISIBLE_DEVICES=1 python -m dynamo.vllm --multimodal-worker --enable-multimodal --enable-mm-embeds --model $MODEL_NAME $EXTRA_ARGS &
fi

# Wait for all background processes to complete
wait