# Copyright 2025 The HuggingFace Team. All rights reserved.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

from typing import Optional

from distilabel.llms import OpenAILLM
from distilabel.pipeline import Pipeline
from distilabel.steps.tasks import TextGeneration


def build_distilabel_pipeline(
    model: str,
    base_url: str = "http://localhost:8000/v1",
    prompt_column: Optional[str] = None,
    temperature: Optional[float] = None,
    top_p: Optional[float] = None,
    max_new_tokens: int = 8192,
    num_generations: int = 1,
) -> Pipeline:
    generation_kwargs = {"max_new_tokens": max_new_tokens}

    if temperature is not None:
        generation_kwargs["temperature"] = temperature

    if top_p is not None:
        generation_kwargs["top_p"] = top_p

    with Pipeline().ray() as pipeline:
        TextGeneration(
            llm=OpenAILLM(
                base_url=base_url,
                api_key="something",
                model=model,
                # thinking can take some time...
                timeout=10 * 60,
                generation_kwargs=generation_kwargs,
            ),
            input_mappings=(
                {"instruction": prompt_column} if prompt_column is not None else {}
            ),
            input_batch_size=64,  # on 4 nodes bs ~60+ leads to preemption due to KV cache exhaustion
            num_generations=num_generations,
        )

    return pipeline


if __name__ == "__main__":
    import argparse

    from datasets import load_dataset

    parser = argparse.ArgumentParser(
        description="Run distilabel pipeline for generating responses with DeepSeek R1"
    )
    parser.add_argument(
        "--hf-dataset",
        type=str,
        required=True,
        help="HuggingFace dataset to load",
    )
    parser.add_argument(
        "--hf-dataset-config",
        type=str,
        required=False,
        help="Dataset config to use",
    )
    parser.add_argument(
        "--hf-dataset-split",
        type=str,
        default="train",
        help="Dataset split to use",
    )
    parser.add_argument("--prompt-column", type=str, default="prompt")
    parser.add_argument(
        "--model",
        type=str,
        required=True,
        help="Model name to use for generation",
    )
    parser.add_argument(
        "--vllm-server-url",
        type=str,
        default="http://localhost:8000/v1",
        help="URL of the vLLM server",
    )
    parser.add_argument(
        "--temperature",
        type=float,
        help="Temperature for generation",
    )
    parser.add_argument(
        "--top-p",
        type=float,
        help="Top-p value for generation",
    )
    parser.add_argument(
        "--max-new-tokens",
        type=int,
        default=8192,
        help="Maximum number of new tokens to generate",
    )
    parser.add_argument(
        "--num-generations",
        type=int,
        default=1,
        help="Number of generations per problem",
    )
    parser.add_argument(
        "--hf-output-dataset",
        type=str,
        required=False,
        help="HuggingFace repo to push results to",
    )
    parser.add_argument(
        "--private",
        action="store_true",
        help="Whether to make the output dataset private when pushing to HF Hub",
    )

    args = parser.parse_args()

    print("\nRunning with arguments:")
    for arg, value in vars(args).items():
        print(f"  {arg}: {value}")
    print()

    print(
        f"Loading '{args.hf_dataset}' (config: {args.hf_dataset_config}, split: {args.hf_dataset_split}) dataset..."
    )
    dataset = load_dataset(args.hf_dataset, split=args.hf_dataset_split)
    print("Dataset loaded!")

    pipeline = build_distilabel_pipeline(
        model=args.model,
        base_url=args.vllm_server_url,
        prompt_column=args.prompt_column,
        temperature=args.temperature,
        top_p=args.top_p,
        max_new_tokens=args.max_new_tokens,
        num_generations=args.num_generations,
    )

    print("Running generation pipeline...")
    distiset = pipeline.run(dataset=dataset, use_cache=False)
    print("Generation pipeline finished!")

    if args.hf_output_dataset:
        print(f"Pushing resulting dataset to '{args.hf_output_dataset}'...")
        distiset.push_to_hub(args.hf_output_dataset, private=args.private)
        print("Dataset pushed!")
