# SPDX-FileCopyrightText: Copyright (c) 2025 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
# SPDX-License-Identifier: Apache-2.0


from __future__ import annotations

import logging
import os
import shutil
import time
from typing import Any, Dict

import pytest
import requests

from tests.conftest import EtcdServer, NatsServer
from tests.utils.constants import QWEN
from tests.utils.managed_process import ManagedProcess
from tests.utils.payloads import check_models_api

logger = logging.getLogger(__name__)

TEST_MODEL = QWEN


class DynamoFrontendProcess(ManagedProcess):
    """Process manager for Dynamo frontend"""

    def __init__(self, request):
        command = ["python", "-m", "dynamo.frontend", "--router-mode", "round-robin"]

        # Unset DYN_SYSTEM_PORT - frontend doesn't use system metrics server
        env = os.environ.copy()
        env.pop("DYN_SYSTEM_PORT", None)

        log_dir = f"{request.node.name}_frontend"

        # Clean up any existing log directory from previous runs
        try:
            shutil.rmtree(log_dir)
            logger.info(f"Cleaned up existing log directory: {log_dir}")
        except FileNotFoundError:
            # Directory doesn't exist, which is fine
            pass

        super().__init__(
            command=command,
            env=env,
            display_output=True,
            terminate_existing=True,
            log_dir=log_dir,
        )


class MockWorkerProcess(ManagedProcess):
    def __init__(self, request, worker_id: str = "mocker-worker"):
        self.worker_id = worker_id

        command = [
            "python3",
            "-m",
            "dynamo.mocker",
            "--model-path",
            TEST_MODEL,
            "--speedup-ratio",
            "100",
        ]

        env = os.environ.copy()
        env["DYN_LOG"] = "debug"
        env["DYN_SYSTEM_USE_ENDPOINT_HEALTH_STATUS"] = '["generate"]'
        env["DYN_SYSTEM_PORT"] = "8083"

        log_dir = f"{request.node.name}_{worker_id}"

        try:
            shutil.rmtree(log_dir)
        except FileNotFoundError:
            pass

        super().__init__(
            command=command,
            env=env,
            health_check_urls=[
                ("http://localhost:8000/v1/models", check_models_api),
                ("http://localhost:8083/health", self.is_ready),
            ],
            timeout=300,
            display_output=True,
            terminate_existing=False,
            stragglers=["VLLM::EngineCore"],
            straggler_commands=["-m dynamo.mocker"],
            log_dir=log_dir,
        )

    def is_ready(self, response) -> bool:
        try:
            status = (response.json() or {}).get("status")
        except ValueError:
            logger.warning("%s health response is not valid JSON", self.worker_id)
            return False

        is_ready = status == "ready"
        if is_ready:
            logger.info("%s status is ready", self.worker_id)
        else:
            logger.warning("%s status is not ready: %s", self.worker_id, status)
        return is_ready


def _send_completion_request(
    payload: Dict[str, Any],
    timeout: int = 180,
) -> requests.Response:
    """Send a text completion request"""

    headers = {"Content-Type": "application/json"}
    print(f"Sending request: {time.time()}")

    response = requests.post(
        "http://localhost:8000/v1/completions",
        headers=headers,
        json=payload,
        timeout=timeout,
    )
    return response


@pytest.fixture(scope="module")
def runtime_services(request):
    """Module-scoped runtime services for this test file."""
    with NatsServer(request) as nats_process:
        with EtcdServer(request) as etcd_process:
            yield nats_process, etcd_process


@pytest.fixture(scope="module")
def start_services(request, runtime_services):
    """Start frontend and worker processes once for this module's tests."""
    with DynamoFrontendProcess(request):
        logger.info("Frontend started for tests")
        with MockWorkerProcess(request):
            logger.info("Worker started for tests")
            yield


@pytest.mark.usefixtures("start_services")
@pytest.mark.e2e
@pytest.mark.model(TEST_MODEL)
def test_completion_string_prompt() -> None:
    payload: Dict[str, Any] = {
        "model": TEST_MODEL,
        "prompt": "Tell me about Mars",
        "max_tokens": 2000,
    }

    response = _send_completion_request(payload)

    assert response.status_code == 200, (
        f"Completion request failed with status "
        f"{response.status_code}: {response.text}"
    )


@pytest.mark.usefixtures("start_services")
@pytest.mark.e2e
@pytest.mark.model(TEST_MODEL)
def test_completion_empty_array_prompt() -> None:
    payload: Dict[str, Any] = {
        "model": TEST_MODEL,
        "prompt": [],
        "max_tokens": 2000,
    }

    response = _send_completion_request(payload)

    assert response.status_code == 400, (
        f"Completion request should failed with status 400 but got"
        f"{response.status_code}: {response.text}"
    )


@pytest.mark.usefixtures("start_services")
@pytest.mark.e2e
@pytest.mark.model(TEST_MODEL)
def test_completion_single_element_array_prompt() -> None:
    payload: Dict[str, Any] = {
        "model": TEST_MODEL,
        "prompt": ["Tell me about Mars"],
        "max_tokens": 2000,
    }

    response = _send_completion_request(payload)

    assert response.status_code == 200, (
        f"Completion request failed with status "
        f"{response.status_code}: {response.text}"
    )


@pytest.mark.usefixtures("start_services")
@pytest.mark.e2e
@pytest.mark.model(TEST_MODEL)
def test_completion_multi_element_array_prompt() -> None:
    payload: Dict[str, Any] = {
        "model": TEST_MODEL,
        "prompt": [
            "Tell me about Mars",
            "Tell me about Ceres",
            "Tell me about Jupiter",
        ],
        "max_tokens": 300,
    }

    response = _send_completion_request(payload)
    response_data = response.json()

    assert response.status_code == 200, (
        f"Completion request failed with status "
        f"{response.status_code}: {response.text}"
    )

    expected_choices = len(payload.get("prompt"))  # type: ignore
    choices = len(response_data.get("choices", []))

    assert (
        expected_choices == choices
    ), f"Expected {expected_choices} choices, got {choices}"
