"""Helm-аддоны для выбранного кластера: ingress-nginx, kube-prometheus-stack, metrics-server, Istio+Kiali.

Операции синхронные (долгие таймауты — см. ``KIND_K8S_HELM_TIMEOUT_SEC``).

Автор: Сергей Антропов
Сайт: https://devops.org.ru
"""

from __future__ import annotations

import asyncio
import logging

from fastapi import APIRouter, Body, HTTPException

from core.cluster_lifecycle import validate_cluster_name
from core.helm_addons import (
    HelmAddonError,
    addon_status,
    require_helm_binary,
    install_ingress_nginx,
    install_istio_and_kiali,
    install_kube_prometheus_stack,
    install_metrics_server,
    uninstall_ingress_nginx,
    uninstall_istio_and_kiali,
    uninstall_kube_prometheus_stack,
    uninstall_metrics_server,
)
from core.kind_guard import kind_cluster_lock
from models.schemas import (
    ClusterAddonsStatusResponse,
    HelmAddonApplyResponse,
    IngressNginxInstallRequest,
    IstioKialiInstallRequest,
    KubePrometheusStackInstallRequest,
    MetricsServerInstallRequest,
)

logger = logging.getLogger("kind_k8s.api.cluster_addons")

router = APIRouter(tags=["cluster-addons"])

_LOG_MAX = 24000


def _trim_log(s: str) -> str:
    if len(s) <= _LOG_MAX:
        return s
    return s[: _LOG_MAX - 20] + "\n… (обрезано)"


def _map_helm_error(e: HelmAddonError) -> HTTPException:
    msg = str(e)
    if e.exit_code == 127:
        return HTTPException(status_code=503, detail=msg)
    return HTTPException(status_code=500, detail=msg)


@router.get(
    "/clusters/{name}/addons/status",
    response_model=ClusterAddonsStatusResponse,
    summary="Статус Helm-аддонов в кластере",
)
async def get_cluster_addons_status(name: str) -> ClusterAddonsStatusResponse:
    n = name.strip()
    if not validate_cluster_name(n):
        raise HTTPException(status_code=400, detail="Некорректное имя кластера")
    try:
        require_helm_binary()
    except HelmAddonError as e:
        raise _map_helm_error(e) from e
    try:
        st = await asyncio.to_thread(addon_status, n)
    except HelmAddonError as e:
        raise _map_helm_error(e) from e
    mesh = bool(st.get("istio_base") and st.get("istiod") and st.get("kiali"))
    return ClusterAddonsStatusResponse(
        cluster_name=n,
        ingress_nginx=bool(st.get("ingress_nginx")),
        kube_prometheus_stack=bool(st.get("kube_prometheus_stack")),
        metrics_server=bool(st.get("metrics_server")),
        istio_base=bool(st.get("istio_base")),
        istiod=bool(st.get("istiod")),
        kiali_server=bool(st.get("kiali")),
        istio_mesh_ready=mesh,
    )


@router.post(
    "/clusters/{name}/addons/ingress-nginx",
    response_model=HelmAddonApplyResponse,
    summary="Установить ingress-nginx (Helm)",
)
async def post_install_ingress_nginx(
    name: str,
    body: IngressNginxInstallRequest | None = Body(default=None),
) -> HelmAddonApplyResponse:
    n = name.strip()
    if not validate_cluster_name(n):
        raise HTTPException(status_code=400, detail="Некорректное имя кластера")
    ver: str | None = None
    if body is not None and body.chart_version and body.chart_version.strip():
        ver = body.chart_version.strip()
    async with kind_cluster_lock:
        try:
            _, log = await asyncio.to_thread(install_ingress_nginx, n, ver)
        except HelmAddonError as e:
            raise _map_helm_error(e) from e
    logger.info("Установлен ingress-nginx для кластера «%s»", n)
    return HelmAddonApplyResponse(ok=True, message="ingress-nginx установлен.", log=_trim_log(log))


@router.delete(
    "/clusters/{name}/addons/ingress-nginx",
    response_model=HelmAddonApplyResponse,
    summary="Удалить ingress-nginx",
)
async def delete_ingress_nginx(name: str) -> HelmAddonApplyResponse:
    n = name.strip()
    if not validate_cluster_name(n):
        raise HTTPException(status_code=400, detail="Некорректное имя кластера")
    async with kind_cluster_lock:
        try:
            _, log = await asyncio.to_thread(uninstall_ingress_nginx, n)
        except HelmAddonError as e:
            raise _map_helm_error(e) from e
    return HelmAddonApplyResponse(ok=True, message="ingress-nginx удалён.", log=_trim_log(log))


@router.post(
    "/clusters/{name}/addons/kube-prometheus-stack",
    response_model=HelmAddonApplyResponse,
    summary="Установить kube-prometheus-stack (Prometheus Operator + Grafana)",
)
async def post_install_kube_prometheus_stack(
    name: str,
    body: KubePrometheusStackInstallRequest,
) -> HelmAddonApplyResponse:
    n = name.strip()
    if not validate_cluster_name(n):
        raise HTTPException(status_code=400, detail="Некорректное имя кластера")
    prom_ver: str | None = None
    if body.chart_version and body.chart_version.strip():
        prom_ver = body.chart_version.strip()
    async with kind_cluster_lock:
        try:
            _, log = await asyncio.to_thread(
                install_kube_prometheus_stack,
                n,
                grafana_admin_user=body.grafana_admin_user.strip(),
                grafana_admin_password=body.grafana_admin_password,
                chart_version=prom_ver,
            )
        except HelmAddonError as e:
            raise _map_helm_error(e) from e
    logger.info("Установлен kube-prometheus-stack для кластера «%s»", n)
    return HelmAddonApplyResponse(ok=True, message="kube-prometheus-stack установлен.", log=_trim_log(log))


@router.delete(
    "/clusters/{name}/addons/kube-prometheus-stack",
    response_model=HelmAddonApplyResponse,
    summary="Удалить kube-prometheus-stack",
)
async def delete_kube_prometheus_stack(name: str) -> HelmAddonApplyResponse:
    n = name.strip()
    if not validate_cluster_name(n):
        raise HTTPException(status_code=400, detail="Некорректное имя кластера")
    async with kind_cluster_lock:
        try:
            _, log = await asyncio.to_thread(uninstall_kube_prometheus_stack, n)
        except HelmAddonError as e:
            raise _map_helm_error(e) from e
    return HelmAddonApplyResponse(ok=True, message="kube-prometheus-stack удалён.", log=_trim_log(log))


@router.post(
    "/clusters/{name}/addons/metrics-server",
    response_model=HelmAddonApplyResponse,
    summary="Установить metrics-server",
)
async def post_install_metrics_server(
    name: str,
    body: MetricsServerInstallRequest | None = Body(default=None),
) -> HelmAddonApplyResponse:
    n = name.strip()
    if not validate_cluster_name(n):
        raise HTTPException(status_code=400, detail="Некорректное имя кластера")
    ms_ver: str | None = None
    if body is not None and body.chart_version and body.chart_version.strip():
        ms_ver = body.chart_version.strip()
    async with kind_cluster_lock:
        try:
            _, log = await asyncio.to_thread(install_metrics_server, n, ms_ver)
        except HelmAddonError as e:
            raise _map_helm_error(e) from e
    logger.info("Установлен metrics-server для кластера «%s»", n)
    return HelmAddonApplyResponse(ok=True, message="metrics-server установлен.", log=_trim_log(log))


@router.delete(
    "/clusters/{name}/addons/metrics-server",
    response_model=HelmAddonApplyResponse,
    summary="Удалить metrics-server",
)
async def delete_metrics_server(name: str) -> HelmAddonApplyResponse:
    n = name.strip()
    if not validate_cluster_name(n):
        raise HTTPException(status_code=400, detail="Некорректное имя кластера")
    async with kind_cluster_lock:
        try:
            _, log = await asyncio.to_thread(uninstall_metrics_server, n)
        except HelmAddonError as e:
            raise _map_helm_error(e) from e
    return HelmAddonApplyResponse(ok=True, message="metrics-server удалён.", log=_trim_log(log))


@router.post(
    "/clusters/{name}/addons/istio-kiali",
    response_model=HelmAddonApplyResponse,
    summary="Установить Istio (base+istiod) и Kiali с логином",
)
async def post_install_istio_kiali(
    name: str,
    body: IstioKialiInstallRequest,
) -> HelmAddonApplyResponse:
    n = name.strip()
    if not validate_cluster_name(n):
        raise HTTPException(status_code=400, detail="Некорректное имя кластера")
    istio_ver: str | None = None
    if body.istio_chart_version and body.istio_chart_version.strip():
        istio_ver = body.istio_chart_version.strip()
    kiali_ver: str | None = None
    if body.kiali_chart_version and body.kiali_chart_version.strip():
        kiali_ver = body.kiali_chart_version.strip()
    async with kind_cluster_lock:
        try:
            _, log = await asyncio.to_thread(
                install_istio_and_kiali,
                n,
                kiali_username=body.kiali_username.strip(),
                kiali_password=body.kiali_password,
                istio_chart_version=istio_ver,
                kiali_chart_version=kiali_ver,
            )
        except HelmAddonError as e:
            raise _map_helm_error(e) from e
    logger.info("Установлены Istio+Kiali для кластера «%s»", n)
    return HelmAddonApplyResponse(ok=True, message="Istio и Kiali установлены.", log=_trim_log(log))


@router.delete(
    "/clusters/{name}/addons/istio-kiali",
    response_model=HelmAddonApplyResponse,
    summary="Удалить Kiali, istiod и istio-base",
)
async def delete_istio_kiali(name: str) -> HelmAddonApplyResponse:
    n = name.strip()
    if not validate_cluster_name(n):
        raise HTTPException(status_code=400, detail="Некорректное имя кластера")
    async with kind_cluster_lock:
        try:
            _, log = await asyncio.to_thread(uninstall_istio_and_kiali, n)
        except HelmAddonError as e:
            raise _map_helm_error(e) from e
    return HelmAddonApplyResponse(ok=True, message="Istio/Kiali удалены.", log=_trim_log(log))