// Copyright 2019 TiKV Project 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 statistics

import (
	"time"

	"github.com/tikv/pd/server/core"
)

// HotPeersStat records all hot regions statistics
type HotPeersStat struct {
	StoreByteRate  float64           `json:"store_bytes"`
	StoreKeyRate   float64           `json:"store_keys"`
	StoreQueryRate float64           `json:"store_query"`
	TotalBytesRate float64           `json:"total_flow_bytes"`
	TotalKeysRate  float64           `json:"total_flow_keys"`
	TotalQueryRate float64           `json:"total_flow_query"`
	Count          int               `json:"regions_count"`
	Stats          []HotPeerStatShow `json:"statistics"`
}

// HotPeerStatShow records the hot region statistics for output
type HotPeerStatShow struct {
	StoreID        uint64    `json:"store_id"`
	Stores         []uint64  `json:"stores"`
	IsLeader       bool      `json:"is_leader"`
	IsLearner      bool      `json:"is_learner"`
	RegionID       uint64    `json:"region_id"`
	HotDegree      int       `json:"hot_degree"`
	ByteRate       float64   `json:"flow_bytes"`
	KeyRate        float64   `json:"flow_keys"`
	QueryRate      float64   `json:"flow_query"`
	AntiCount      int       `json:"anti_count"`
	LastUpdateTime time.Time `json:"last_update_time"`
}

// UpdateHotPeerStatShow updates the region information, such as `IsLearner` and `LastUpdateTime`.
func (h *HotPeerStatShow) UpdateHotPeerStatShow(region *core.RegionInfo) {
	if region == nil {
		return
	}
	h.IsLearner = core.IsLearner(region.GetPeer(h.StoreID))
	h.LastUpdateTime = time.Unix(int64(region.GetInterval().GetEndTimestamp()), 0)
}