// Copyright 2020-2021 Clastix Labs
// SPDX-License-Identifier: Apache-2.0

package tenant

import (
	"context"
	"regexp"

	"k8s.io/client-go/tools/record"
	"sigs.k8s.io/controller-runtime/pkg/client"
	"sigs.k8s.io/controller-runtime/pkg/webhook/admission"

	capsulev1beta1 "github.com/clastix/capsule/api/v1beta1"
	capsulewebhook "github.com/clastix/capsule/pkg/webhook"
	"github.com/clastix/capsule/pkg/webhook/utils"
)

type nameHandler struct{}

func NameHandler() capsulewebhook.Handler {
	return &nameHandler{}
}

func (h *nameHandler) OnCreate(_ client.Client, decoder *admission.Decoder, _ record.EventRecorder) capsulewebhook.Func {
	return func(ctx context.Context, req admission.Request) *admission.Response {
		tenant := &capsulev1beta1.Tenant{}
		if err := decoder.Decode(req, tenant); err != nil {
			return utils.ErroredResponse(err)
		}

		matched, _ := regexp.MatchString(`[a-z0-9]([-a-z0-9]*[a-z0-9])?`, tenant.GetName())
		if !matched {
			response := admission.Denied("tenant name has forbidden characters")

			return &response
		}

		return nil
	}
}

func (h *nameHandler) OnDelete(client.Client, *admission.Decoder, record.EventRecorder) capsulewebhook.Func {
	return func(context.Context, admission.Request) *admission.Response {
		return nil
	}
}

func (h *nameHandler) OnUpdate(client.Client, *admission.Decoder, record.EventRecorder) capsulewebhook.Func {
	return func(ctx context.Context, req admission.Request) *admission.Response {
		return nil
	}
}
