// Copyright 2019 Istio 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 snapshotter

import (
	"testing"
	"time"

	. "github.com/onsi/gomega"

	"istio.io/istio/galley/pkg/config/analysis/diag"
)

func TestInMemoryStatusUpdaterWriteThenWait(t *testing.T) {
	g := NewGomegaWithT(t)

	su := &InMemoryStatusUpdater{WaitTimeout: 1 * time.Second}

	msgs := diag.Messages{
		diag.NewMessage(diag.NewMessageType(diag.Error, "test", "test"), nil),
	}

	cancelCh := make(chan struct{})

	su.Update(msgs)
	g.Expect(su.WaitForReport(cancelCh)).To(BeNil())
	g.Expect(su.Get()).To(Equal(msgs))
}

func TestInMemoryStatusUpdaterWriteNothingThenWait(t *testing.T) {
	g := NewGomegaWithT(t)

	su := &InMemoryStatusUpdater{WaitTimeout: 1 * time.Second}

	var msgs diag.Messages

	cancelCh := make(chan struct{})

	su.Update(msgs)
	g.Expect(su.WaitForReport(cancelCh)).To(BeNil())
	g.Expect(su.Get()).To(Equal(msgs))
}

func TestInMemoryStatusUpdaterWaitThenWrite(t *testing.T) {
	g := NewGomegaWithT(t)

	su := &InMemoryStatusUpdater{WaitTimeout: 1 * time.Second}

	msgs := diag.Messages{
		diag.NewMessage(diag.NewMessageType(diag.Error, "test", "test"), nil),
	}

	cancelCh := make(chan struct{})

	go func() {
		g.Expect(su.WaitForReport(cancelCh)).To(BeNil())
	}()

	su.Update(msgs)
	g.Expect(su.Get()).To(Equal(msgs))
}

func TestInMemoryStatusUpdaterTimesOut(t *testing.T) {
	g := NewGomegaWithT(t)

	su := &InMemoryStatusUpdater{WaitTimeout: 0}

	cancelCh := make(chan struct{})

	err := su.WaitForReport(cancelCh)
	g.Expect(err).To(Not(BeNil()))
}

func TestInMemoryStatusUpdaterCancelled(t *testing.T) {
	g := NewGomegaWithT(t)

	su := &InMemoryStatusUpdater{WaitTimeout: 1 * time.Second}

	cancelCh := make(chan struct{})
	testDone := make(chan struct{})

	var err error
	go func() {
		err = su.WaitForReport(cancelCh)
		close(testDone)
	}()

	close(cancelCh)
	<-testDone

	g.Expect(err).To(Not(BeNil()))
	g.Expect(err.Error()).To(ContainSubstring("cancelled"))
}
