import gc
import json
import os
import subprocess
from unittest.mock import MagicMock, patch

import openai
import pytest
import ray
import torch

from tests.entrypoints.test_openai_server import ServerRunner
from vllm import SamplingParams
from vllm.model_executor.model_loader.tensorizer import (
    EncryptionParams, TensorizerConfig, TensorSerializer,
    is_vllm_serialized_tensorizer, load_with_tensorizer, open_stream)

prompts = [
    "Hello, my name is",
    "The president of the United States is",
    "The capital of France is",
    "The future of AI is",
]
# Create a sampling params object.
sampling_params = SamplingParams(temperature=0.8, top_p=0.95, seed=0)

model_ref = "facebook/opt-125m"
tensorize_model_for_testing_script = os.path.join(
    os.path.dirname(__file__), "tensorize_vllm_model_for_testing.py")


def is_curl_installed():
    try:
        subprocess.check_call(['curl', '--version'])
        return True
    except (subprocess.CalledProcessError, FileNotFoundError):
        return False


@pytest.fixture(autouse=True)
def tensorizer_config():
    config = TensorizerConfig(tensorizer_uri="vllm", vllm_tensorized=True)
    return config


@patch('vllm.model_executor.model_loader.tensorizer.TensorizerAgent')
def test_load_with_tensorizer(mock_agent, tensorizer_config):
    mock_linear_method = MagicMock()
    mock_agent_instance = mock_agent.return_value
    mock_agent_instance.deserialize.return_value = MagicMock()

    result = load_with_tensorizer(tensorizer_config,
                                  linear_method=mock_linear_method)

    mock_agent.assert_called_once_with(tensorizer_config,
                                       linear_method=mock_linear_method)
    mock_agent_instance.deserialize.assert_called_once()
    assert result == mock_agent_instance.deserialize.return_value


def test_is_vllm_model_with_vllm_in_uri(tensorizer_config):
    tensorizer_config.vllm_tensorized = True

    result = is_vllm_serialized_tensorizer(tensorizer_config)

    assert result is True


def test_is_vllm_model_without_vllm_in_uri(tensorizer_config):
    tensorizer_config.vllm_tensorized = False

    result = is_vllm_serialized_tensorizer(tensorizer_config)

    assert result is False


def test_deserialized_vllm_model_has_same_outputs(vllm_runner, tmp_path):
    vllm_model = vllm_runner(model_ref)
    model_path = tmp_path / (model_ref + ".tensors")
    outputs = vllm_model.generate(prompts, sampling_params)
    model = (vllm_model.model.llm_engine.model_executor.driver_worker.
             model_runner.model)
    with open_stream(model_path, "wb+") as stream:
        serializer = TensorSerializer(stream)
        serializer.write_module(model)
    del vllm_model, model
    gc.collect()
    torch.cuda.empty_cache()
    loaded_vllm_model = vllm_runner(
        model_ref,
        load_format="tensorizer",
        model_loader_extra_config=TensorizerConfig(tensorizer_uri=model_path,
                                                   num_readers=1,
                                                   vllm_tensorized=True),
    )
    deserialized_outputs = loaded_vllm_model.generate(prompts, sampling_params)

    # Assumes SamplingParams being seeded ensures the outputs are deterministic
    assert outputs == deserialized_outputs


@pytest.mark.skipif(not is_curl_installed(), reason="cURL is not installed")
def test_can_deserialize_s3(vllm_runner):
    model_ref = "EleutherAI/pythia-1.4b"
    tensorized_path = f"s3://tensorized/{model_ref}/fp16/model.tensors"

    loaded_hf_model = vllm_runner(model_ref,
                                  load_format="tensorizer",
                                  model_loader_extra_config=TensorizerConfig(
                                      tensorizer_uri=tensorized_path,
                                      num_readers=1,
                                      vllm_tensorized=False,
                                      s3_endpoint="object.ord1.coreweave.com",
                                  ))

    deserialized_outputs = loaded_hf_model.generate(prompts, sampling_params)

    assert deserialized_outputs


@pytest.mark.skipif(not is_curl_installed(), reason="cURL is not installed")
def test_deserialized_encrypted_vllm_model_has_same_outputs(
        vllm_runner, tmp_path):
    vllm_model = vllm_runner(model_ref)
    model_path = tmp_path / (model_ref + ".tensors")
    key_path = tmp_path / (model_ref + ".key")
    outputs = vllm_model.generate(prompts, sampling_params)
    model = (vllm_model.model.llm_engine.model_executor.driver_worker.
             model_runner.model)

    encryption_params = EncryptionParams.random()
    with open_stream(model_path, "wb+") as stream:
        serializer = TensorSerializer(stream, encryption=encryption_params)
        serializer.write_module(model)
    with open_stream(key_path, "wb+") as stream:
        stream.write(encryption_params.key)
    del vllm_model, model
    gc.collect()
    torch.cuda.empty_cache()
    loaded_vllm_model = vllm_runner(model_ref,
                                    load_format="tensorizer",
                                    model_loader_extra_config=TensorizerConfig(
                                        tensorizer_uri=model_path,
                                        encryption_keyfile=key_path,
                                        num_readers=1,
                                        vllm_tensorized=True))

    deserialized_outputs = loaded_vllm_model.generate(prompts, sampling_params)

    # Assumes SamplingParams being seeded ensures the outputs are deterministic
    assert outputs == deserialized_outputs


def test_deserialized_hf_model_has_same_outputs(hf_runner, vllm_runner,
                                                tmp_path):
    hf_model = hf_runner(model_ref)
    model_path = tmp_path / (model_ref + ".tensors")
    max_tokens = 50
    outputs = hf_model.generate_greedy(prompts, max_tokens=max_tokens)
    with open_stream(model_path, "wb+") as stream:
        serializer = TensorSerializer(stream)
        serializer.write_module(hf_model.model)
    del hf_model
    gc.collect()
    torch.cuda.empty_cache()
    loaded_hf_model = vllm_runner(model_ref,
                                  load_format="tensorizer",
                                  model_loader_extra_config=TensorizerConfig(
                                      tensorizer_uri=model_path,
                                      num_readers=1,
                                      vllm_tensorized=False))

    deserialized_outputs = loaded_hf_model.generate_greedy(
        prompts, max_tokens=max_tokens)

    assert outputs == deserialized_outputs


def test_vllm_model_can_load_with_lora(vllm_runner, tmp_path):
    from huggingface_hub import snapshot_download

    from examples.multilora_inference import (create_test_prompts,
                                              process_requests)

    model_ref = "meta-llama/Llama-2-7b-hf"
    lora_path = snapshot_download(repo_id="yard1/llama-2-7b-sql-lora-test")
    test_prompts = create_test_prompts(lora_path)

    # Serialize model before deserializing and binding LoRA adapters
    vllm_model = vllm_runner(model_ref, )
    model_path = tmp_path / (model_ref + ".tensors")
    model = (vllm_model.model.llm_engine.model_executor.driver_worker.
             model_runner.model)
    with open_stream(model_path, "wb+") as stream:
        serializer = TensorSerializer(stream)
        serializer.write_module(model)
    del vllm_model, model
    gc.collect()
    torch.cuda.empty_cache()
    loaded_vllm_model = vllm_runner(
        model_ref,
        load_format="tensorizer",
        model_loader_extra_config=TensorizerConfig(
            tensorizer_uri=model_path,
            num_readers=1,
            vllm_tensorized=True,
        ),
        enable_lora=True,
        max_loras=1,
        max_lora_rank=8,
        max_cpu_loras=2,
        max_num_seqs=50,
        max_model_len=1000,
    )
    process_requests(loaded_vllm_model.model.llm_engine, test_prompts)

    assert loaded_vllm_model


def test_load_without_tensorizer_load_format(vllm_runner):
    with pytest.raises(ValueError):
        vllm_runner(model_ref,
                    model_loader_extra_config=TensorizerConfig(
                        tensorizer_uri="test", vllm_tensorized=False))


@pytest.mark.skipif(not is_curl_installed(), reason="cURL is not installed")
def test_tensorize_vllm_model(tmp_path):
    # Test serialize command
    serialize_args = [
        "python3", tensorize_model_for_testing_script, "--model", model_ref,
        "--dtype", "float16", "serialize", "--serialized-directory", tmp_path,
        "--suffix", "tests"
    ]
    result = subprocess.run(serialize_args, capture_output=True, text=True)
    print(result.stdout)  # Print the output of the serialize command

    assert result.returncode == 0, (f"Serialize command failed with output:"
                                    f"\n{result.stdout}\n{result.stderr}")

    path_to_tensors = f"{tmp_path}/vllm/{model_ref}/tests/model.tensors"

    # Test deserialize command
    deserialize_args = [
        "python3", tensorize_model_for_testing_script, "--model", model_ref,
        "--dtype", "float16", "deserialize", "--path-to-tensors",
        path_to_tensors
    ]
    result = subprocess.run(deserialize_args, capture_output=True, text=True)
    assert result.returncode == 0, (f"Deserialize command failed with output:"
                                    f"\n{result.stdout}\n{result.stderr}")


@pytest.mark.skipif(not is_curl_installed(), reason="cURL is not installed")
def test_openai_apiserver_with_tensorizer(tmp_path):
    ## Serialize model
    serialize_args = [
        "python3", tensorize_model_for_testing_script, "--model", model_ref,
        "--dtype", "float16", "serialize", "--serialized-directory", tmp_path,
        "--suffix", "tests"
    ]
    result = subprocess.run(serialize_args, capture_output=True, text=True)
    print(result.stdout)  # Print the output of the serialize command

    assert result.returncode == 0, (f"Serialize command failed with output:"
                                    f"\n{result.stdout}\n{result.stderr}")

    path_to_tensors = f"{tmp_path}/vllm/{model_ref}/tests/model.tensors"
    model_loader_extra_config = {
        "tensorizer_uri": path_to_tensors,
        "vllm_tensorized": True
    }

    ## Start OpenAI API server
    openai_args = [
        "--model", model_ref, "--dtype", "float16", "--load-format",
        "tensorizer", "--model-loader-extra-config",
        json.dumps(model_loader_extra_config), "--port", "8000"
    ]

    server = ServerRunner.remote(openai_args)

    assert ray.get(server.ready.remote())
    print("Server ready.")

    client = openai.OpenAI(
        base_url="http://localhost:8000/v1",
        api_key="token-abc123",
    )
    completion = client.completions.create(model=model_ref,
                                           prompt="Hello, my name is",
                                           max_tokens=5,
                                           temperature=0.0)

    assert completion.id is not None
    assert completion.choices is not None and len(completion.choices) == 1
    assert completion.choices[0].text is not None and len(
        completion.choices[0].text) >= 5
    assert completion.choices[0].finish_reason == "length"
    assert completion.usage == openai.types.CompletionUsage(
        completion_tokens=5, prompt_tokens=6, total_tokens=11)


def test_raise_value_error_on_invalid_load_format(vllm_runner):
    with pytest.raises(ValueError):
        vllm_runner(model_ref,
                    load_format="safetensors",
                    model_loader_extra_config=TensorizerConfig(
                        tensorizer_uri="test", vllm_tensorized=False))


def test_tensorizer_with_tp(vllm_runner):
    with pytest.raises(ValueError):
        model_ref = "EleutherAI/pythia-1.4b"
        tensorized_path = f"s3://tensorized/{model_ref}/fp16/model.tensors"

        vllm_runner(
            model_ref,
            load_format="tensorizer",
            model_loader_extra_config=TensorizerConfig(
                tensorizer_uri=tensorized_path,
                num_readers=1,
                vllm_tensorized=False,
                s3_endpoint="object.ord1.coreweave.com",
            ),
            tensor_parallel_size=2,
        )
