/*
Copyright 2019 The Knative Authors.

Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at

    http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/

package v1alpha1

import (
	"fmt"

	corev1 "k8s.io/api/core/v1"
	"k8s.io/apimachinery/pkg/runtime/schema"

	"knative.dev/networking/pkg/apis/networking/v1alpha1"
	"knative.dev/pkg/apis"
)

var routeCondSet = apis.NewLivingConditionSet(
	RouteConditionAllTrafficAssigned,
	RouteConditionIngressReady,
	RouteConditionCertificateProvisioned,
)

// GetConditionSet retrieves the ConditionSet of the Route. Implements the KRShaped interface.
func (*Route) GetConditionSet() apis.ConditionSet {
	return routeCondSet
}

func (r *Route) GetGroupVersionKind() schema.GroupVersionKind {
	return SchemeGroupVersion.WithKind("Route")
}

func (rs *RouteStatus) IsReady() bool {
	return routeCondSet.Manage(rs).IsHappy()
}

func (rs *RouteStatus) GetCondition(t apis.ConditionType) *apis.Condition {
	return routeCondSet.Manage(rs).GetCondition(t)
}

func (rs *RouteStatus) InitializeConditions() {
	routeCondSet.Manage(rs).InitializeConditions()
}

// // MarkResourceNotConvertible adds a Warning-severity condition to the resource noting that
// // it cannot be converted to a higher version.
// func (rs *RouteStatus) MarkResourceNotConvertible(err *CannotConvertError) {
// 	routeCondSet.Manage(rs).SetCondition(apis.Condition{
// 		Type:     ConditionTypeConvertible,
// 		Status:   corev1.ConditionFalse,
// 		Severity: apis.ConditionSeverityWarning,
// 		Reason:   err.Field,
// 		Message:  err.Message,
// 	})
// }

// MarkServiceNotOwned changes the IngressReady status to be false with the reason being that
// there is a pre-existing placeholder service with the name we wanted to use.
func (rs *RouteStatus) MarkServiceNotOwned(name string) {
	routeCondSet.Manage(rs).MarkFalse(RouteConditionIngressReady, "NotOwned",
		fmt.Sprintf("There is an existing placeholder Service %q that we do not own.", name))
}

// MarkIngressNotConfigured changes the IngressReady condition to be unknown to reflect
// that the Ingress does not yet have a Status
func (rs *RouteStatus) MarkIngressNotConfigured() {
	routeCondSet.Manage(rs).MarkUnknown(RouteConditionIngressReady,
		"IngressNotConfigured", "Ingress has not yet been reconciled.")
}

func (rs *RouteStatus) MarkTrafficAssigned() {
	routeCondSet.Manage(rs).MarkTrue(RouteConditionAllTrafficAssigned)
}

func (rs *RouteStatus) MarkUnknownTrafficError(msg string) {
	routeCondSet.Manage(rs).MarkUnknown(RouteConditionAllTrafficAssigned, "Unknown", msg)
}

func (rs *RouteStatus) MarkConfigurationNotReady(name string) {
	routeCondSet.Manage(rs).MarkUnknown(RouteConditionAllTrafficAssigned,
		"RevisionMissing",
		"Configuration %q is waiting for a Revision to become ready.", name)
}

func (rs *RouteStatus) MarkConfigurationFailed(name string) {
	routeCondSet.Manage(rs).MarkFalse(RouteConditionAllTrafficAssigned,
		"RevisionMissing",
		"Configuration %q does not have any ready Revision.", name)
}

func (rs *RouteStatus) MarkRevisionNotReady(name string) {
	routeCondSet.Manage(rs).MarkUnknown(RouteConditionAllTrafficAssigned,
		"RevisionMissing",
		"Revision %q is not yet ready.", name)
}

func (rs *RouteStatus) MarkRevisionFailed(name string) {
	routeCondSet.Manage(rs).MarkFalse(RouteConditionAllTrafficAssigned,
		"RevisionMissing",
		"Revision %q failed to become ready.", name)
}

func (rs *RouteStatus) MarkMissingTrafficTarget(kind, name string) {
	routeCondSet.Manage(rs).MarkFalse(RouteConditionAllTrafficAssigned,
		kind+"Missing",
		"%s %q referenced in traffic not found.", kind, name)
}

func (rs *RouteStatus) MarkCertificateProvisionFailed(name string) {
	routeCondSet.Manage(rs).MarkFalse(RouteConditionCertificateProvisioned,
		"CertificateProvisionFailed",
		"Certificate %s fails to be provisioned.", name)
}

func (rs *RouteStatus) MarkCertificateReady(name string) {
	routeCondSet.Manage(rs).MarkTrue(RouteConditionCertificateProvisioned)
}

func (rs *RouteStatus) MarkCertificateNotReady(name string) {
	routeCondSet.Manage(rs).MarkUnknown(RouteConditionCertificateProvisioned,
		"CertificateNotReady",
		"Certificate %s is not ready.", name)
}

func (rs *RouteStatus) MarkCertificateNotOwned(name string) {
	routeCondSet.Manage(rs).MarkFalse(RouteConditionCertificateProvisioned,
		"CertificateNotOwned",
		"There is an existing certificate %s that we don't own.", name)
}

const (
	AutoTLSNotEnabledMessage            = "autoTLS is not enabled"
	TLSNotEnabledForClusterLocalMessage = "TLS is not enabled for cluster-local"
)

// MarkTLSNotEnabled sets RouteConditionCertificateProvisioned to true when
// certificate config such as autoTLS is not enabled or private cluster-local service.
func (rs *RouteStatus) MarkTLSNotEnabled(msg string) {
	routeCondSet.Manage(rs).MarkTrueWithReason(RouteConditionCertificateProvisioned,
		"TLSNotEnabled", msg)
}

// MarkHTTPDowngrade sets RouteConditionCertificateProvisioned to true when plain
// HTTP is enabled even when Certificated is not ready.
func (rs *RouteStatus) MarkHTTPDowngrade(name string) {
	routeCondSet.Manage(rs).MarkTrueWithReason(RouteConditionCertificateProvisioned,
		"HTTPDowngrade",
		"Certificate %s is not ready downgrade HTTP.", name)
}

// PropagateIngressStatus update RouteConditionIngressReady condition
// in RouteStatus according to IngressStatus.
func (rs *RouteStatus) PropagateIngressStatus(cs v1alpha1.IngressStatus) {
	cc := cs.GetCondition(v1alpha1.IngressConditionReady)
	if cc == nil {
		rs.MarkIngressNotConfigured()
		return
	}

	m := routeCondSet.Manage(rs)
	switch cc.Status {
	case corev1.ConditionTrue:
		m.MarkTrue(RouteConditionIngressReady)
	case corev1.ConditionFalse:
		m.MarkFalse(RouteConditionIngressReady, cc.Reason, cc.Message)
	case corev1.ConditionUnknown:
		m.MarkUnknown(RouteConditionIngressReady, cc.Reason, cc.Message)
	}
}
