/*
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 helpers

import (
	"context"
	"fmt"
	"testing"

	cloudevents "github.com/cloudevents/sdk-go/v2"
	. "github.com/cloudevents/sdk-go/v2/test"
	"github.com/google/uuid"
	corev1 "k8s.io/api/core/v1"

	testlib "knative.dev/eventing/test/lib"
	"knative.dev/eventing/test/lib/dropevents"
	"knative.dev/eventing/test/lib/recordevents"
	"knative.dev/eventing/test/lib/resources"
)

// BrokerCreator creates a broker and returns its broker name.
type BrokerCreatorWithRetries func(client *testlib.Client, numRetries int32) string

func BrokerRedelivery(ctx context.Context, t *testing.T, creator BrokerCreatorWithRetries) {

	numRetries := int32(5)

	t.Run(dropevents.Fibonacci, func(t *testing.T) {
		brokerRedelivery(ctx, t, creator, numRetries, func(pod *corev1.Pod, client *testlib.Client) error {
			pod.Spec.Containers[0].Env = append(pod.Spec.Containers[0].Env,
				corev1.EnvVar{
					Name:  dropevents.SkipAlgorithmKey,
					Value: dropevents.Fibonacci,
				},
			)
			return nil
		})
	})

	t.Run(dropevents.Sequence, func(t *testing.T) {
		brokerRedelivery(ctx, t, creator, numRetries, func(pod *corev1.Pod, client *testlib.Client) error {
			pod.Spec.Containers[0].Env = append(pod.Spec.Containers[0].Env,
				corev1.EnvVar{
					Name:  dropevents.SkipAlgorithmKey,
					Value: dropevents.Sequence,
				},
				corev1.EnvVar{
					Name:  dropevents.NumberKey,
					Value: fmt.Sprintf("%d", numRetries),
				},
			)
			return nil
		})
	})
}

func brokerRedelivery(ctx context.Context, t *testing.T, creator BrokerCreatorWithRetries, numRetries int32, options ...recordevents.EventRecordOption) {

	const (
		triggerName = "trigger"
		eventRecord = "event-record"
		senderName  = "sender"

		eventType   = "type"
		eventSource = "http://source.com"
		eventBody   = `{"msg":"broker-redelivery"}`
	)

	client := testlib.Setup(t, true)
	defer testlib.TearDown(client)

	// Create event tracker that should receive all events.
	allEventTracker, _ := recordevents.StartEventRecordOrFail(
		ctx,
		client,
		eventRecord,
		options...,
	)

	// Create a Broker.
	brokerName := creator(client, numRetries)

	client.CreateTriggerOrFail(
		triggerName,
		resources.WithBroker(brokerName),
		resources.WithSubscriberServiceRefForTrigger(eventRecord),
	)

	client.WaitForAllTestResourcesReadyOrFail(ctx)

	// send CloudEvent to the broker

	eventToSend := cloudevents.NewEvent()
	eventToSend.SetID(uuid.New().String())
	eventToSend.SetType(eventType)
	eventToSend.SetSource(eventSource)
	if err := eventToSend.SetData(cloudevents.ApplicationJSON, []byte(eventBody)); err != nil {
		t.Fatal("Cannot set the payload of the event:", err.Error())
	}

	client.SendEventToAddressable(ctx, senderName, brokerName, testlib.BrokerTypeMeta, eventToSend)

	allEventTracker.AssertAtLeast(1, recordevents.MatchKind(recordevents.EventReceived), recordevents.MatchEvent(AllOf(
		HasSource(eventSource),
		HasType(eventType),
		HasData([]byte(eventBody)),
	)))
}
