# SPDX-License-Identifier: Apache-2.0
# SPDX-FileCopyrightText: Copyright contributors to the vLLM project
import os
import subprocess
import sys
from typing import Union

import vllm
from vllm import LLM
from vllm.lora.request import LoRARequest
from vllm.model_executor.model_loader.tensorizer import TensorizerConfig

from ..utils import VLLM_PATH, create_new_process_for_each_test, multi_gpu_test, models_path_prefix

MODEL_PATH = os.path.join(models_path_prefix, "meta-llama/Llama-2-7b-hf")

EXPECTED_LORA_OUTPUT = [
    "  SELECT icao FROM table_name_74 WHERE airport = 'lilongwe international airport' ",  # noqa: E501
    "  SELECT nationality FROM table_name_11 WHERE elector = 'anchero pantaleone' ",  # noqa: E501
    "  SELECT one_mora FROM table_name_95 WHERE gloss = 'low tone mora with a gloss of /˩okiru/' [òkìɽɯ́] AND accented_mora = 'low tone mora with a gloss of /˩okiru/' [òkìɽɯ́] ",  # noqa: E501
    "  SELECT sex FROM people WHERE people_id IN (SELECT people_id FROM candidate GROUP BY sex ORDER BY COUNT(people_id) DESC LIMIT 1) ",  # noqa: E501
    "  SELECT pick FROM table_name_60 WHERE former_wnba_team = 'Minnesota Lynx' ",  # noqa: E501
    "  SELECT womens_doubles FROM table_28138035_4 WHERE mens_singles = 'Werner Schlager' "  # noqa: E501
]


def do_sample(llm: vllm.LLM,
              lora_path: str,
              lora_id: int,
              tensorizer_config_dict: Union[dict, None] = None) -> list[str]:
    prompts = [
        "[user] Write a SQL query to answer the question based on the table schema.\n\n context: CREATE TABLE table_name_74 (icao VARCHAR, airport VARCHAR)\n\n question: Name the ICAO for lilongwe international airport [/user] [assistant]",  # noqa: E501
        "[user] Write a SQL query to answer the question based on the table schema.\n\n context: CREATE TABLE table_name_11 (nationality VARCHAR, elector VARCHAR)\n\n question: When Anchero Pantaleone was the elector what is under nationality? [/user] [assistant]",  # noqa: E501
        "[user] Write a SQL query to answer the question based on the table schema.\n\n context: CREATE TABLE table_name_95 (one_mora VARCHAR, gloss VARCHAR, accented_mora VARCHAR)\n\n question: What is the one mora for a low tone mora with a gloss of /˩okiru/ [òkìɽɯ́]? [/user] [assistant]",  # noqa: E501
        "[user] Write a SQL query to answer the question based on the table schema.\n\n context: CREATE TABLE candidate (people_id VARCHAR, unsure_rate INTEGER); CREATE TABLE people (sex VARCHAR, people_id VARCHAR)\n\n question: which gender got the highest average uncertain ratio. [/user] [assistant]",  # noqa: E501
        "[user] Write a SQL query to answer the question based on the table schema.\n\n context: CREATE TABLE table_name_60 (pick INTEGER, former_wnba_team VARCHAR)\n\n question: What pick was a player that previously played for the Minnesota Lynx? [/user] [assistant]",  # noqa: E501
        "[user] Write a SQL query to answer the question based on the table schema.\n\n context: CREATE TABLE table_28138035_4 (womens_doubles VARCHAR, mens_singles VARCHAR)\n\n question: Name the women's doubles for werner schlager [/user] [assistant]"  # noqa: E501
    ]

    sampling_params = vllm.SamplingParams(temperature=0,
                                          max_tokens=256,
                                          skip_special_tokens=False,
                                          stop=["[/assistant]"])

    if tensorizer_config_dict is not None:
        outputs = llm.generate(
            prompts,
            sampling_params,
            lora_request=LoRARequest(
                str(lora_id),
                lora_id,
                lora_path,
                tensorizer_config_dict=tensorizer_config_dict)
            if lora_id else None)
    else:
        outputs = llm.generate(
            prompts,
            sampling_params,
            lora_request=LoRARequest(str(lora_id), lora_id, lora_path)
            if lora_id else None)
    # Print the outputs.
    generated_texts: list[str] = []
    for output in outputs:
        prompt = output.prompt
        generated_text = output.outputs[0].text
        generated_texts.append(generated_text)
        print(f"Prompt: {prompt!r}, Generated text: {generated_text!r}")
    return generated_texts


def generate_and_test(llm,
                      sql_lora_files,
                      tensorizer_config_dict: Union[dict, None] = None):
    print("lora adapter created")
    print("lora 1")
    assert do_sample(llm,
                     sql_lora_files,
                     tensorizer_config_dict=tensorizer_config_dict,
                     lora_id=1) == EXPECTED_LORA_OUTPUT

    print("lora 2")
    assert do_sample(llm,
                     sql_lora_files,
                     tensorizer_config_dict=tensorizer_config_dict,
                     lora_id=2) == EXPECTED_LORA_OUTPUT

    print("removing lora")


@create_new_process_for_each_test()
def test_llama_lora(sql_lora_files):

    llm = vllm.LLM(
        MODEL_PATH,
        tokenizer=sql_lora_files,
        enable_lora=True,
        # also test odd max_num_seqs
        max_num_seqs=13,
        max_loras=4)
    generate_and_test(llm, sql_lora_files)


@multi_gpu_test(num_gpus=4)
@create_new_process_for_each_test()
def test_llama_lora_tp4(sql_lora_files):

    llm = vllm.LLM(
        MODEL_PATH,
        tokenizer=sql_lora_files,
        enable_lora=True,
        max_num_seqs=16,
        max_loras=4,
        tensor_parallel_size=4,
    )
    generate_and_test(llm, sql_lora_files)


@multi_gpu_test(num_gpus=4)
@create_new_process_for_each_test()
def test_llama_lora_tp4_fully_sharded_loras(sql_lora_files):

    llm = vllm.LLM(
        MODEL_PATH,
        tokenizer=sql_lora_files,
        enable_lora=True,
        max_num_seqs=16,
        max_loras=4,
        tensor_parallel_size=4,
        fully_sharded_loras=True,
    )
    generate_and_test(llm, sql_lora_files)


@multi_gpu_test(num_gpus=2)
@create_new_process_for_each_test()
def test_tp2_serialize_and_deserialize_lora(tmp_path, sql_lora_files,
                                            sql_lora_huggingface_id):

    # Run the tensorizing of the LoRA adapter and the model in a subprocess
    # to guarantee cleanup

    tp_size = 2
    model_name = "model-rank-%03d.tensors"

    model_ref = MODEL_PATH
    lora_path = sql_lora_huggingface_id
    suffix = "test"
    try:
        result = subprocess.run([
            sys.executable,
            f"{VLLM_PATH}/examples/others/tensorize_vllm_model.py", "--model",
            MODEL_PATH, "--lora-path", lora_path, "--tensor-parallel-size",
            str(tp_size), "serialize", "--serialized-directory",
            str(tmp_path), "--suffix", suffix, "--serialization-kwargs",
            '{"limit_cpu_concurrency": 4}'
        ],
                                check=True,
                                capture_output=True,
                                text=True)
    except subprocess.CalledProcessError as e:
        print("Tensorizing failed.")
        print("STDOUT:\n", e.stdout)
        print("STDERR:\n", e.stderr)
        raise

    print("STDOUT:\n", result.stdout)

    model_uri = tmp_path / "vllm" / model_ref / suffix / model_name
    tensorizer_config = TensorizerConfig(tensorizer_uri=str(model_uri))

    loaded_llm = LLM(model=model_ref,
                     tokenizer=sql_lora_files,
                     load_format="tensorizer",
                     enable_lora=True,
                     enforce_eager=True,
                     model_loader_extra_config=tensorizer_config,
                     max_num_seqs=13,
                     tensor_parallel_size=2,
                     max_loras=2)

    tc_as_dict = tensorizer_config.to_serializable()

    print("lora adapter created")
    print("lora 1")
    assert do_sample(loaded_llm,
                     sql_lora_files,
                     tensorizer_config_dict=tc_as_dict,
                     lora_id=1) == EXPECTED_LORA_OUTPUT
