// Copyright 2015 Google Inc. All Rights Reserved.
//
// 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 api

import (
	"strings"
	"testing"
	"time"

	info "github.com/google/cadvisor/info/v1"
	"github.com/google/cadvisor/integration/framework"
	"github.com/stretchr/testify/require"
)

func TestStreamingEventInformationIsReturned(t *testing.T) {
	fm := framework.New(t)
	defer fm.Cleanup()

	// Watch for container deletions
	einfo := make(chan *info.Event)
	go func() {
		err := fm.Cadvisor().Client().EventStreamingInfo("?deletion_events=true&stream=true&subcontainers=true", einfo)
		require.NoError(t, err)
	}()

	// Create a short-lived container.
	containerId := fm.Docker().RunBusybox("sleep", "2")

	// Wait for the deletion event.
	timeout := time.After(30 * time.Second)
	done := false
	for !done {
		select {
		case ev := <-einfo:
			if ev.EventType == info.EventContainerDeletion {
				if strings.Contains(ev.ContainerName, containerId) {
					done = true
				}
			}
		case <-timeout:
			t.Errorf(
				"timeout happened before destruction event was detected for container %q", containerId)
			done = true
		}
	}

	// We should have already received a creation event.
	waitForStaticEvent(containerId, "?creation_events=true&subcontainers=true", t, fm, info.EventContainerCreation)
}

func waitForStaticEvent(containerId string, urlRequest string, t *testing.T, fm framework.Framework, typeEvent info.EventType) {
	einfo, err := fm.Cadvisor().Client().EventStaticInfo(urlRequest)
	require.NoError(t, err)
	found := false
	for _, ev := range einfo {
		if ev.EventType == typeEvent {
			if strings.Contains(ev.ContainerName, containerId) {
				found = true
				break
			}
		}
	}
	require.True(t, found)
}