// Copyright 2017 PingCAP, Inc.
//
// 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,
// See the License for the specific language governing permissions and
// limitations under the License.

package schedulers

import (
	"time"

	"github.com/pingcap-incubator/tinykv/scheduler/server/core"
	"github.com/pkg/errors"
)

const (
	leaderTolerantSizeRatio float64 = 5.0
)

// ErrScheduleConfigNotExist the config is not correct.
var ErrScheduleConfigNotExist = errors.New("the config does not exist")

func minUint64(a, b uint64) uint64 {
	if a < b {
		return a
	}
	return b
}

func maxUint64(a, b uint64) uint64 {
	if a > b {
		return a
	}
	return b
}

func minDuration(a, b time.Duration) time.Duration {
	if a < b {
		return a
	}
	return b
}

func isRegionUnhealthy(region *core.RegionInfo) bool {
	return len(region.GetLearners()) != 0
}