# SPDX-FileCopyrightText: Copyright (c) 2025-2026 NVIDIA CORPORATION & AFFILIATES. All rights reserved.
# SPDX-License-Identifier: Apache-2.0

import logging
import os
import time
from typing import Any

from tests.router.common import (
    _test_router_basic,
    _test_router_decisions,
    _test_router_indexers_sync,
)
from tests.router.helper import get_runtime
from tests.utils.constants import DefaultPort
from tests.utils.port_utils import allocate_ports, deallocate_ports
from tests.utils.test_output import resolve_test_output_path

logger = logging.getLogger(__name__)

TEST_PROMPT = (
    "In a quiet meadow tucked between rolling hills, a plump gray rabbit nibbled on "
    "clover beneath the shade of a gnarled oak tree. Its ears twitched at the faint "
    "rustle of leaves, but it remained calm, confident in the safety of its burrow "
    "just a few hops away. The late afternoon sun warmed its fur, and tiny dust "
    "motes danced in the golden light as bees hummed lazily nearby. Though the "
    "rabbit lived a simple life, every day was an adventure of scents, shadows, and "
    "snacks-an endless search for the tastiest patch of greens and the softest spot "
    "to nap."
)


def allocate_frontend_ports(request, count: int) -> list[int]:
    ports = allocate_ports(count, DefaultPort.FRONTEND.value)
    request.addfinalizer(lambda: deallocate_ports(ports))
    return ports


def build_test_payload(model_name: str) -> dict[str, Any]:
    return {
        "model": model_name,
        "messages": [{"role": "user", "content": TEST_PROMPT}],
        "stream": True,
        "max_tokens": 10,
    }


class ManagedEngineProcessMixin:
    process_name = "worker"
    cleanup_name = "worker resources"
    init_delay_seconds = 5
    init_delay_reason = "initialize before starting next worker"
    cleanup_delay_seconds = 2

    def __enter__(self):
        logger.info(
            "[%s] Starting %d worker processes sequentially...",
            self.__class__.__name__,
            len(self.worker_processes),
        )

        for i, process in enumerate(self.worker_processes):
            logger.info(
                "[%s] Starting %s %d...", self.__class__.__name__, self.process_name, i
            )
            try:
                process._logger = logging.getLogger(process.__class__.__name__)
                process._command_name = process.command[0]
                process.log_dir = resolve_test_output_path(process.log_dir)
                os.makedirs(process.log_dir, exist_ok=True)
                log_name = f"{process._command_name}.log.txt"
                process._log_path = os.path.join(process.log_dir, log_name)

                if process.data_dir:
                    process._remove_directory(process.data_dir)

                process._terminate_all_matching_process_names()
                logger.info(
                    "[%s] Launching process %d (pid will be assigned)...",
                    self.__class__.__name__,
                    i,
                )
                process._start_process()
                logger.info(
                    "[%s] Worker %d launched with PID: %s",
                    self.__class__.__name__,
                    i,
                    process.proc.pid if process.proc else "unknown",
                )
                time.sleep(process.delayed_start)

                if i < len(self.worker_processes) - 1:
                    logger.info(
                        "[%s] Waiting %ss for worker %d to %s...",
                        self.__class__.__name__,
                        self.init_delay_seconds,
                        i,
                        self.init_delay_reason,
                    )
                    time.sleep(self.init_delay_seconds)

            except Exception:
                logger.exception(
                    "[%s] Failed to start worker %d", self.__class__.__name__, i
                )
                try:
                    process.__exit__(None, None, None)
                except Exception as cleanup_err:
                    logger.warning(
                        "[%s] Error during cleanup: %s",
                        self.__class__.__name__,
                        cleanup_err,
                    )
                raise

        logger.info(
            "[%s] All %d workers launched with sequential initialization.",
            self.__class__.__name__,
            len(self.worker_processes),
        )
        logger.info(
            "[%s] Waiting for health checks to complete...", self.__class__.__name__
        )

        for i, process in enumerate(self.worker_processes):
            logger.info(
                "[%s] Checking health for worker %d...", self.__class__.__name__, i
            )
            try:
                elapsed = process._check_ports(process.timeout)
                process._check_urls(process.timeout - elapsed)
                process._check_funcs(process.timeout - elapsed)
                logger.info(
                    "[%s] Worker %d health checks passed", self.__class__.__name__, i
                )
            except Exception:
                logger.error(
                    "[%s] Worker %d health check failed", self.__class__.__name__, i
                )
                self.__exit__(None, None, None)
                raise

        logger.info(
            "[%s] All workers started successfully and passed health checks!",
            self.__class__.__name__,
        )
        return self

    def __exit__(self, exc_type, exc_val, exc_tb):
        for i, process in enumerate(self.worker_processes):
            logger.info("Stopping %s %d", self.process_name, i)
            process.__exit__(exc_type, exc_val, exc_tb)

        logger.info("Waiting for %s to fully clean up...", self.cleanup_name)
        time.sleep(self.cleanup_delay_seconds)


def get_engine_endpoint(engine_workers, request_plane: str, component_name: str):
    runtime = get_runtime(request_plane=request_plane)
    return runtime.endpoint(f"{engine_workers.namespace}.{component_name}.generate")


def run_basic_router_test(
    *,
    engine_process_cls,
    engine_args_name: str,
    engine_args: dict[str, Any],
    num_workers: int,
    single_gpu: bool,
    request,
    request_plane: str,
    block_size: int,
    model_name: str,
    frontend_timeout: int = 180,
):
    with engine_process_cls(
        request,
        num_workers=num_workers,
        single_gpu=single_gpu,
        request_plane=request_plane,
        **{engine_args_name: engine_args},
    ) as engine_workers:
        frontend_port = allocate_frontend_ports(request, 1)[0]
        _test_router_basic(
            engine_workers=engine_workers,
            block_size=block_size,
            request=request,
            frontend_port=frontend_port,
            test_payload=build_test_payload(model_name),
            num_requests=10,
            frontend_timeout=frontend_timeout,
            store_backend="etcd",
            request_plane=request_plane,
        )


def run_router_decisions_test(
    *,
    engine_process_cls,
    engine_args_name: str,
    engine_args: dict[str, Any],
    request,
    request_plane: str,
    model_name: str,
    block_size: int,
    component_name: str,
    num_workers: int,
    single_gpu: bool,
    test_dp_rank: bool,
    extra_process_kwargs: dict[str, Any] | None = None,
):
    process_kwargs = extra_process_kwargs or {}
    with engine_process_cls(
        request,
        num_workers=num_workers,
        single_gpu=single_gpu,
        request_plane=request_plane,
        **{engine_args_name: engine_args},
        **process_kwargs,
    ) as engine_workers:
        endpoint = get_engine_endpoint(engine_workers, request_plane, component_name)
        _test_router_decisions(
            engine_workers,
            endpoint,
            model_name,
            request,
            test_dp_rank=test_dp_rank,
            block_size=block_size,
        )


def run_indexers_sync_test(
    *,
    engine_process_cls,
    engine_args_name: str,
    engine_args: dict[str, Any],
    request,
    runtime_services_dynamic_ports,
    store_backend: str,
    durable_kv_events: bool,
    request_plane: str,
    block_size: int,
    model_name: str,
    num_workers: int,
):
    nats_process, _etcd_process = runtime_services_dynamic_ports

    with engine_process_cls(
        request,
        num_workers=num_workers,
        single_gpu=True,
        request_plane=request_plane,
        store_backend=store_backend,
        durable_kv_events=durable_kv_events,
        **{engine_args_name: engine_args},
    ) as engine_workers:
        _test_router_indexers_sync(
            engine_workers=engine_workers,
            block_size=block_size,
            model_name=model_name,
            num_workers=num_workers,
            store_backend=store_backend,
            request_plane=request_plane,
            test_nats_interruption=not durable_kv_events,
            nats_server=nats_process if not durable_kv_events else None,
            durable_kv_events=durable_kv_events,
        )
