// Copyright 2019 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,
// 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 config

import (
	"time"

	"github.com/docker/go-units"
	"google.golang.org/grpc"
	"google.golang.org/grpc/keepalive"
)

// some constants
const (
	DefaultBatchImportRatio = 0.75

	ReadBlockSize ByteSize = 64 * units.KiB
	// SplitRegionSize is the default coprocessor.region-split-keys value before TiKV v8.4.0 See:
	// 	https://github.com/tikv/tikv/blob/e030a0aae9622f3774df89c62f21b2171a72a69e/etc/config-template.toml#L360
	// lower the max-key-count to avoid tikv trigger region auto split
	SplitRegionSize         ByteSize = 96 * units.MiB
	SplitRegionKeys         int      = 960_000
	MaxSplitRegionSizeRatio int      = 10

	defaultMaxAllowedPacket = 64 * units.MiB
)

// static vars
var (
	DefaultGrpcKeepaliveParams = grpc.WithKeepaliveParams(keepalive.ClientParameters{
		Time:                1 * time.Minute,
		Timeout:             2 * time.Minute,
		PermitWithoutStream: false,
	})
	// BufferSizeScale is the factor of block buffer size
	BufferSizeScale           = int64(5)
	DefaultBatchSize ByteSize = 100 * units.GiB
	MaxRegionSize    ByteSize = 256 * units.MiB
)