// Copyright 2016-2018 The NATS 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 test

import (
	"fmt"
	"strings"
	"sync"
	"testing"
	"time"
)

func checkFor(t *testing.T, totalWait, sleepDur time.Duration, f func() error) {
	t.Helper()
	timeout := time.Now().Add(totalWait)
	var err error
	for time.Now().Before(timeout) {
		err = f()
		if err == nil {
			return
		}
		time.Sleep(sleepDur)
	}
	if err != nil {
		t.Fatal(err.Error())
	}
}

type dummyLogger struct {
	sync.Mutex
	msg string
}

func (d *dummyLogger) Fatalf(format string, args ...interface{}) {
	d.Lock()
	d.msg = fmt.Sprintf(format, args...)
	d.Unlock()
}

func (d *dummyLogger) Errorf(format string, args ...interface{}) {
}

func (d *dummyLogger) Debugf(format string, args ...interface{}) {
}

func (d *dummyLogger) Tracef(format string, args ...interface{}) {
}

func (d *dummyLogger) Noticef(format string, args ...interface{}) {
}

func TestStackFatal(t *testing.T) {
	d := &dummyLogger{}
	stackFatalf(d, "test stack %d", 1)
	if !strings.HasPrefix(d.msg, "test stack 1") {
		t.Fatalf("Unexpected start of stack: %v", d.msg)
	}
	if !strings.Contains(d.msg, "test_test.go") {
		t.Fatalf("Unexpected stack: %v", d.msg)
	}
}