"""
NHN Cloud Async Task Runner

Threading 기반 비동기 작업 실행
"""

import logging
import threading
from functools import wraps

import django
from django.db import close_old_connections

logger = logging.getLogger(__name__)


def run_async(func):
    """
    함수를 비동기로 실행하는 데코레이터
    Django DB 연결 관리 포함
    """

    @wraps(func)
    def wrapper(*args, **kwargs):
        def run():
            try:
                # Django 설정 확인
                django.setup()
                # 기존 DB 연결 정리
                close_old_connections()
                # 실제 함수 실행
                func(*args, **kwargs)
            except Exception as e:
                logger.exception(f"Async task error: {e}")
            finally:
                # DB 연결 정리
                close_old_connections()

        thread = threading.Thread(target=run, daemon=True)
        thread.start()
        return thread

    return wrapper


def execute_async_task(task_id, task_func, *args, **kwargs):
    """
    AsyncTask 모델과 연동하여 비동기 작업 실행

    Args:
        task_id: AsyncTask 모델의 ID
        task_func: 실행할 함수 (ApiCompute.create_instance 등)
        *args, **kwargs: 함수에 전달할 인자
    """
    from .models import AsyncTask

    def run():
        try:
            django.setup()
            close_old_connections()

            # 작업 시작
            task = AsyncTask.objects.get(id=task_id)
            task.mark_running()
            logger.info(f"[AsyncTask] 작업 시작: {task_id} ({task.task_type})")

            # 실제 작업 실행
            result = task_func(*args, **kwargs)

            # 결과에서 리소스 ID 추출
            resource_id = None
            if isinstance(result, dict):
                # 인스턴스 생성 결과
                if "server" in result:
                    resource_id = result["server"].get("id")
                # NKS 클러스터 생성 결과
                elif "uuid" in result:
                    resource_id = result.get("uuid")

            # 성공 처리
            task.mark_success(result_data=result, resource_id=resource_id)
            logger.info(f"[AsyncTask] 작업 완료: {task_id}, resource_id={resource_id}")

        except Exception as e:
            logger.exception(f"[AsyncTask] 작업 실패: {task_id}")
            try:
                task = AsyncTask.objects.get(id=task_id)
                task.mark_failed(str(e))
            except Exception:
                pass
        finally:
            close_old_connections()

    thread = threading.Thread(target=run, daemon=True)
    thread.start()
    logger.info(f"[AsyncTask] 백그라운드 스레드 시작: {task_id}")
    return thread


def create_instance_async(region, tenant_id, token, instance_data):
    """
    인스턴스 비동기 생성

    Args:
        region: 리전
        tenant_id: 테넌트 ID
        token: API 토큰
        instance_data: 인스턴스 생성 데이터 (dict)

    Returns:
        AsyncTask: 생성된 작업 객체
    """
    from .models import AsyncTask
    from .packages.compute import ApiCompute

    # 작업 레코드 생성
    task = AsyncTask.objects.create(
        task_type=AsyncTask.TaskType.INSTANCE_CREATE,
        request_data=instance_data,
        resource_name=instance_data.get("name", ""),
    )

    # API 객체 생성
    api = ApiCompute(region, tenant_id, token)

    # 비동기 실행
    execute_async_task(
        task_id=task.id,
        task_func=api.create_instance,
        name=instance_data["name"],
        image_id=instance_data["image_id"],
        flavor_id=instance_data["flavor_id"],
        subnet_id=instance_data["subnet_id"],
        keypair_name=instance_data.get("keypair_name", ""),
        volume_size=instance_data.get("volume_size", 50),
        volume_type=instance_data.get("volume_type", "General SSD"),
        security_groups=instance_data.get("security_groups"),
        availability_zone=instance_data.get("availability_zone"),
    )

    return task


def create_nks_cluster_async(region, token, cluster_data):
    """
    NKS 클러스터 비동기 생성

    Args:
        region: 리전
        token: API 토큰
        cluster_data: 클러스터 생성 데이터 (dict)

    Returns:
        AsyncTask: 생성된 작업 객체
    """
    from .models import AsyncTask
    from .packages.nks import ApiNks

    # 작업 레코드 생성
    task = AsyncTask.objects.create(
        task_type=AsyncTask.TaskType.NKS_CREATE,
        request_data=cluster_data,
        resource_name=cluster_data.get("cluster_name", ""),
    )

    # API 객체 생성
    api = ApiNks(region, token)

    # 비동기 실행
    execute_async_task(
        task_id=task.id,
        task_func=api.create_cluster,
        **cluster_data,
    )

    return task


# ==================== Instance 비동기 작업 ====================


def delete_instance_async(region, tenant_id, token, server_id, server_name=""):
    """인스턴스 비동기 삭제"""
    from .models import AsyncTask
    from .packages.compute import ApiCompute

    task = AsyncTask.objects.create(
        task_type=AsyncTask.TaskType.INSTANCE_DELETE,
        request_data={"server_id": server_id},
        resource_name=server_name,
        resource_id=server_id,
    )

    api = ApiCompute(region, tenant_id, token)
    execute_async_task(
        task_id=task.id,
        task_func=api.delete_instance,
        server_id=server_id,
    )

    return task


def instance_action_async(region, tenant_id, token, server_id, action, server_name="", hard=False):
    """인스턴스 액션 비동기 실행 (start/stop/reboot)"""
    from .models import AsyncTask
    from .packages.compute import ApiCompute

    task = AsyncTask.objects.create(
        task_type=AsyncTask.TaskType.INSTANCE_ACTION,
        request_data={"server_id": server_id, "action": action, "hard": hard},
        resource_name=server_name,
        resource_id=server_id,
    )

    api = ApiCompute(region, tenant_id, token)

    if action == "start":
        task_func = api.start_instance
    elif action == "stop":
        task_func = api.stop_instance
    elif action == "reboot":
        def task_func(server_id):
            return api.reboot_instance(server_id, hard=hard)
    else:
        raise ValueError(f"Invalid action: {action}")

    execute_async_task(
        task_id=task.id,
        task_func=task_func,
        server_id=server_id,
    )

    return task


# ==================== VPC 비동기 작업 ====================


def create_vpc_async(region, token, name, cidr):
    """VPC 비동기 생성"""
    from .models import AsyncTask
    from .packages.vpc import ApiVpc

    task = AsyncTask.objects.create(
        task_type=AsyncTask.TaskType.VPC_CREATE,
        request_data={"name": name, "cidr": cidr},
        resource_name=name,
    )

    api = ApiVpc(region, token)
    execute_async_task(
        task_id=task.id,
        task_func=api.create_vpc,
        name=name,
        cidr=cidr,
    )

    return task


def delete_vpc_async(region, token, vpc_id, vpc_name=""):
    """VPC 비동기 삭제"""
    from .models import AsyncTask
    from .packages.vpc import ApiVpc

    task = AsyncTask.objects.create(
        task_type=AsyncTask.TaskType.VPC_DELETE,
        request_data={"vpc_id": vpc_id},
        resource_name=vpc_name,
        resource_id=vpc_id,
    )

    api = ApiVpc(region, token)
    execute_async_task(
        task_id=task.id,
        task_func=api.delete_vpc,
        vpc_id=vpc_id,
    )

    return task


# ==================== Subnet 비동기 작업 ====================


def create_subnet_async(region, token, vpc_id, cidr, name):
    """서브넷 비동기 생성"""
    from .models import AsyncTask
    from .packages.vpc import ApiVpc

    task = AsyncTask.objects.create(
        task_type=AsyncTask.TaskType.SUBNET_CREATE,
        request_data={"vpc_id": vpc_id, "cidr": cidr, "name": name},
        resource_name=name,
    )

    api = ApiVpc(region, token)
    execute_async_task(
        task_id=task.id,
        task_func=api.create_subnet,
        vpc_id=vpc_id,
        cidr=cidr,
        name=name,
    )

    return task


def delete_subnet_async(region, token, subnet_id, subnet_name=""):
    """서브넷 비동기 삭제"""
    from .models import AsyncTask
    from .packages.vpc import ApiVpc

    task = AsyncTask.objects.create(
        task_type=AsyncTask.TaskType.SUBNET_DELETE,
        request_data={"subnet_id": subnet_id},
        resource_name=subnet_name,
        resource_id=subnet_id,
    )

    api = ApiVpc(region, token)
    execute_async_task(
        task_id=task.id,
        task_func=api.delete_subnet,
        subnet_id=subnet_id,
    )

    return task


# ==================== NKS 비동기 작업 ====================


def delete_nks_cluster_async(region, token, cluster_name):
    """NKS 클러스터 비동기 삭제"""
    from .models import AsyncTask
    from .packages.nks import ApiNks

    task = AsyncTask.objects.create(
        task_type=AsyncTask.TaskType.NKS_DELETE,
        request_data={"cluster_name": cluster_name},
        resource_name=cluster_name,
    )

    api = ApiNks(region, token)
    execute_async_task(
        task_id=task.id,
        task_func=api.delete_cluster,
        cluster_name=cluster_name,
    )

    return task


# ==================== Storage 비동기 작업 ====================


def create_storage_container_async(region, token, storage_account, container_name):
    """스토리지 컨테이너 비동기 생성"""
    from .models import AsyncTask
    from .packages.storage import ApiStorageObject

    task = AsyncTask.objects.create(
        task_type=AsyncTask.TaskType.STORAGE_CREATE,
        request_data={"container_name": container_name},
        resource_name=container_name,
    )

    api = ApiStorageObject(region, token, storage_account)
    execute_async_task(
        task_id=task.id,
        task_func=api.create_container,
        container_name=container_name,
    )

    return task


def delete_storage_container_async(region, token, storage_account, container_name):
    """스토리지 컨테이너 비동기 삭제"""
    from .models import AsyncTask
    from .packages.storage import ApiStorageObject

    task = AsyncTask.objects.create(
        task_type=AsyncTask.TaskType.STORAGE_DELETE,
        request_data={"container_name": container_name},
        resource_name=container_name,
    )

    api = ApiStorageObject(region, token, storage_account)
    execute_async_task(
        task_id=task.id,
        task_func=api.delete_container,
        container_name=container_name,
    )

    return task


# ==================== Load Balancer 비동기 작업 ====================


def create_loadbalancer_async(region, token, lb_data):
    """
    로드밸런서 비동기 생성

    Args:
        region: 리전
        token: API 토큰
        lb_data: 로드밸런서 생성 데이터 (dict)

    Returns:
        AsyncTask: 생성된 작업 객체
    """
    from .models import AsyncTask
    from .packages.loadbalancer import ApiLoadBalancer

    task = AsyncTask.objects.create(
        task_type=AsyncTask.TaskType.LB_CREATE,
        request_data=lb_data,
        resource_name=lb_data.get("name", ""),
    )

    api = ApiLoadBalancer(region, token)
    execute_async_task(
        task_id=task.id,
        task_func=api.create_loadbalancer,
        vip_subnet_id=lb_data["vip_subnet_id"],
        name=lb_data.get("name"),
        description=lb_data.get("description"),
        vip_address=lb_data.get("vip_address"),
        admin_state_up=lb_data.get("admin_state_up", True),
        loadbalancer_type=lb_data.get("loadbalancer_type", "shared"),
    )

    return task


def delete_loadbalancer_async(region, token, loadbalancer_id, loadbalancer_name=""):
    """로드밸런서 비동기 삭제"""
    from .models import AsyncTask
    from .packages.loadbalancer import ApiLoadBalancer

    task = AsyncTask.objects.create(
        task_type=AsyncTask.TaskType.LB_DELETE,
        request_data={"loadbalancer_id": loadbalancer_id},
        resource_name=loadbalancer_name,
        resource_id=loadbalancer_id,
    )

    api = ApiLoadBalancer(region, token)
    execute_async_task(
        task_id=task.id,
        task_func=api.delete_loadbalancer,
        loadbalancer_id=loadbalancer_id,
    )

    return task