/*
 * Copyright 2020 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 v1

import (
	corev1 "k8s.io/api/core/v1"
	"k8s.io/apimachinery/pkg/runtime/schema"
	"knative.dev/pkg/apis"
	duckv1 "knative.dev/pkg/apis/duck/v1"
)

var triggerCondSet = apis.NewLivingConditionSet(TriggerConditionBroker, TriggerConditionSubscribed, TriggerConditionDependency, TriggerConditionSubscriberResolved)

const (
	// TriggerConditionReady has status True when all subconditions below have been set to True.
	TriggerConditionReady = apis.ConditionReady

	TriggerConditionBroker apis.ConditionType = "BrokerReady"

	TriggerConditionSubscribed apis.ConditionType = "SubscriptionReady"

	TriggerConditionDependency apis.ConditionType = "DependencyReady"

	TriggerConditionSubscriberResolved apis.ConditionType = "SubscriberResolved"

	// TriggerAnyFilter Constant to represent that we should allow anything.
	TriggerAnyFilter = ""
)

// GetConditionSet retrieves the condition set for this resource. Implements the KRShaped interface.
func (*Trigger) GetConditionSet() apis.ConditionSet {
	return triggerCondSet
}

// GetGroupVersionKind returns GroupVersionKind for Triggers
func (t *Trigger) GetGroupVersionKind() schema.GroupVersionKind {
	return SchemeGroupVersion.WithKind("Trigger")
}

// GetUntypedSpec returns the spec of the Trigger.
func (t *Trigger) GetUntypedSpec() interface{} {
	return t.Spec
}

// GetCondition returns the condition currently associated with the given type, or nil.
func (ts *TriggerStatus) GetCondition(t apis.ConditionType) *apis.Condition {
	return triggerCondSet.Manage(ts).GetCondition(t)
}

// GetTopLevelCondition returns the top level Condition.
func (ts *TriggerStatus) GetTopLevelCondition() *apis.Condition {
	return triggerCondSet.Manage(ts).GetTopLevelCondition()
}

// IsReady returns true if the resource is ready overall.
func (ts *TriggerStatus) IsReady() bool {
	return triggerCondSet.Manage(ts).IsHappy()
}

// InitializeConditions sets relevant unset conditions to Unknown state.
func (ts *TriggerStatus) InitializeConditions() {
	triggerCondSet.Manage(ts).InitializeConditions()
}

func (ts *TriggerStatus) PropagateBrokerCondition(bc *apis.Condition) {
	if bc == nil {
		ts.MarkBrokerNotConfigured()
		return
	}

	switch {
	case bc.Status == corev1.ConditionUnknown:
		ts.MarkBrokerUnknown(bc.Reason, bc.Message)
	case bc.Status == corev1.ConditionTrue:
		triggerCondSet.Manage(ts).MarkTrue(TriggerConditionBroker)
	case bc.Status == corev1.ConditionFalse:
		ts.MarkBrokerFailed(bc.Reason, bc.Message)
	default:
		ts.MarkBrokerUnknown("BrokerUnknown", "The status of Broker is invalid: %v", bc.Status)
	}
}

func (ts *TriggerStatus) MarkBrokerFailed(reason, messageFormat string, messageA ...interface{}) {
	triggerCondSet.Manage(ts).MarkFalse(TriggerConditionBroker, reason, messageFormat, messageA...)
}

func (ts *TriggerStatus) MarkBrokerUnknown(reason, messageFormat string, messageA ...interface{}) {
	triggerCondSet.Manage(ts).MarkUnknown(TriggerConditionBroker, reason, messageFormat, messageA...)
}

func (ts *TriggerStatus) MarkBrokerNotConfigured() {
	triggerCondSet.Manage(ts).MarkUnknown(TriggerConditionBroker,
		"BrokerNotConfigured", "Broker has not yet been reconciled.")
}

func (ts *TriggerStatus) PropagateSubscriptionCondition(sc *apis.Condition) {
	if sc == nil {
		ts.MarkSubscriptionNotConfigured()
		return
	}

	switch {
	case sc.Status == corev1.ConditionUnknown:
		ts.MarkSubscribedUnknown(sc.Reason, sc.Message)
	case sc.Status == corev1.ConditionTrue:
		triggerCondSet.Manage(ts).MarkTrue(TriggerConditionSubscribed)
	case sc.Status == corev1.ConditionFalse:
		ts.MarkNotSubscribed(sc.Reason, sc.Message)
	default:
		ts.MarkSubscribedUnknown("SubscriptionUnknown", "The status of Subscription is invalid: %v", sc.Status)
	}
}

func (ts *TriggerStatus) MarkNotSubscribed(reason, messageFormat string, messageA ...interface{}) {
	triggerCondSet.Manage(ts).MarkFalse(TriggerConditionSubscribed, reason, messageFormat, messageA...)
}

func (ts *TriggerStatus) MarkSubscribedUnknown(reason, messageFormat string, messageA ...interface{}) {
	triggerCondSet.Manage(ts).MarkUnknown(TriggerConditionSubscribed, reason, messageFormat, messageA...)
}

func (ts *TriggerStatus) MarkSubscriptionNotConfigured() {
	triggerCondSet.Manage(ts).MarkUnknown(TriggerConditionSubscribed,
		"SubscriptionNotConfigured", "Subscription has not yet been reconciled.")
}

func (ts *TriggerStatus) MarkSubscriberResolvedSucceeded() {
	triggerCondSet.Manage(ts).MarkTrue(TriggerConditionSubscriberResolved)
}

func (ts *TriggerStatus) MarkSubscriberResolvedFailed(reason, messageFormat string, messageA ...interface{}) {
	triggerCondSet.Manage(ts).MarkFalse(TriggerConditionSubscriberResolved, reason, messageFormat, messageA...)
}

func (ts *TriggerStatus) MarkSubscriberResolvedUnknown(reason, messageFormat string, messageA ...interface{}) {
	triggerCondSet.Manage(ts).MarkUnknown(TriggerConditionSubscriberResolved, reason, messageFormat, messageA...)
}

func (ts *TriggerStatus) MarkDependencySucceeded() {
	triggerCondSet.Manage(ts).MarkTrue(TriggerConditionDependency)
}

func (ts *TriggerStatus) MarkDependencyFailed(reason, messageFormat string, messageA ...interface{}) {
	triggerCondSet.Manage(ts).MarkFalse(TriggerConditionDependency, reason, messageFormat, messageA...)
}

func (ts *TriggerStatus) MarkDependencyUnknown(reason, messageFormat string, messageA ...interface{}) {
	triggerCondSet.Manage(ts).MarkUnknown(TriggerConditionDependency, reason, messageFormat, messageA...)
}

func (ts *TriggerStatus) MarkDependencyNotConfigured() {
	triggerCondSet.Manage(ts).MarkUnknown(TriggerConditionDependency,
		"DependencyNotConfigured", "Dependency has not yet been reconciled.")
}

func (ts *TriggerStatus) PropagateDependencyStatus(ks *duckv1.KResource) {
	kc := ks.Status.GetCondition(apis.ConditionReady)
	if kc == nil {
		ts.MarkDependencyNotConfigured()
		return
	}

	switch {
	case kc.Status == corev1.ConditionUnknown:
		ts.MarkDependencyUnknown(kc.Reason, kc.Message)
	case kc.Status == corev1.ConditionTrue:
		ts.MarkDependencySucceeded()
	case kc.Status == corev1.ConditionFalse:
		ts.MarkDependencyFailed(kc.Reason, kc.Message)
	default:
		ts.MarkDependencyUnknown("DependencyUnknown", "The status of Dependency is invalid: %v", kc.Status)
	}
}
