/**
 * Standalone signaling server for the Nextcloud Spreed app.
 * Copyright (C) 2022 struktur AG
 *
 * @author Joachim Bauch <bauch@struktur.de>
 *
 * @license GNU AGPL version 3 or any later version
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package signaling

import (
	"context"
	"testing"
	"time"
)

func TestBackoff_Exponential(t *testing.T) {
	t.Parallel()
	backoff, err := NewExponentialBackoff(100*time.Millisecond, 500*time.Millisecond)
	if err != nil {
		t.Fatal(err)
	}

	waitTimes := []time.Duration{
		100 * time.Millisecond,
		200 * time.Millisecond,
		400 * time.Millisecond,
		500 * time.Millisecond,
		500 * time.Millisecond,
	}

	for _, wait := range waitTimes {
		if backoff.NextWait() != wait {
			t.Errorf("Wait time should be %s, got %s", wait, backoff.NextWait())
		}

		a := time.Now()
		backoff.Wait(context.Background())
		b := time.Now()
		if b.Sub(a) < wait {
			t.Errorf("Should have waited %s, got %s", wait, b.Sub(a))
		}
	}

	backoff.Reset()
	a := time.Now()
	backoff.Wait(context.Background())
	b := time.Now()
	if b.Sub(a) < 100*time.Millisecond {
		t.Errorf("Should have waited %s, got %s", 100*time.Millisecond, b.Sub(a))
	}
}