// Copyright 2020-2026 Project Capsule Authors
// SPDX-License-Identifier: Apache-2.0

package validation

import (
	"context"

	corev1 "k8s.io/api/core/v1"
	"k8s.io/client-go/tools/events"
	"sigs.k8s.io/controller-runtime/pkg/client"
	"sigs.k8s.io/controller-runtime/pkg/webhook/admission"

	capsulev1beta2 "github.com/projectcapsule/capsule/api/v1beta2"
	"github.com/projectcapsule/capsule/pkg/runtime/configuration"
	evt "github.com/projectcapsule/capsule/pkg/runtime/events"
	"github.com/projectcapsule/capsule/pkg/runtime/handlers"
	"github.com/projectcapsule/capsule/pkg/users"
)

type freezedHandler struct {
	cfg configuration.Configuration
}

func FreezeHandler(configuration configuration.Configuration) handlers.TypedHandlerWithTenant[*corev1.Namespace] {
	return &freezedHandler{cfg: configuration}
}

func (h *freezedHandler) OnCreate(
	c client.Client,
	ns *corev1.Namespace,
	decoder admission.Decoder,
	recorder events.EventRecorder,
	tnt *capsulev1beta2.Tenant,
) handlers.Func {
	return func(ctx context.Context, req admission.Request) *admission.Response {
		if tnt.Spec.Cordoned {
			recorder.Eventf(tnt, ns, corev1.EventTypeWarning, evt.ReasonCordoning, evt.ActionValidationDenied, "Namespace %s cannot be attached, the current Tenant is freezed", ns.GetName())

			response := admission.Denied("the selected Tenant is freezed")

			return &response
		}

		return nil
	}
}

func (h *freezedHandler) OnDelete(
	c client.Client,
	ns *corev1.Namespace,
	decoder admission.Decoder,
	recorder events.EventRecorder,
	tnt *capsulev1beta2.Tenant,
) handlers.Func {
	return func(ctx context.Context, req admission.Request) *admission.Response {
		if tnt.Spec.Cordoned && users.IsCapsuleUser(ctx, c, h.cfg, req.UserInfo.Username, req.UserInfo.Groups) {
			recorder.Eventf(tnt, ns, corev1.EventTypeWarning, "TenantFreezed", "Denied", "Namespace %s cannot be deleted, the current Tenant is freezed", req.Name)

			response := admission.Denied("the selected Tenant is freezed")

			return &response
		}

		return nil
	}
}

func (h *freezedHandler) OnUpdate(
	c client.Client,
	ns *corev1.Namespace,
	old *corev1.Namespace,
	decoder admission.Decoder,
	recorder events.EventRecorder,
	tnt *capsulev1beta2.Tenant,
) handlers.Func {
	return func(ctx context.Context, req admission.Request) *admission.Response {
		if tnt.Spec.Cordoned && users.IsCapsuleUser(ctx, c, h.cfg, req.UserInfo.Username, req.UserInfo.Groups) {
			recorder.Eventf(tnt, ns, corev1.EventTypeWarning, "TenantFreezed", "Denied", "Namespace %s cannot be updated, the current Tenant is freezed", ns.GetName())

			response := admission.Denied("the selected Tenant is freezed")

			return &response
		}

		return nil
	}
}