package aggregate

import (
	"github.com/pingcap-inc/clinic/pkg/ngm/statements/api"
	"github.com/pingcap-inc/clinic/pkg/ngm/statements/load"
)

func AggMaxIaReadSegmentCount() Aggregator {
	return &MaxIaReadSegmentCount{}
}

type MaxIaReadSegmentCount struct {
	max int64
}

var _ Aggregator = (*MaxIaReadSegmentCount)(nil)

func (a *MaxIaReadSegmentCount) Add(record *load.StmtRecord) {
	if a.max < record.MaxIaReadSegmentCount {
		a.max = record.MaxIaReadSegmentCount
	}
}

func (a *MaxIaReadSegmentCount) Merge(agg Aggregator) {
	if agg, ok := agg.(*MaxIaReadSegmentCount); ok {
		if a.max < agg.max {
			a.max = agg.max
		}
	}
}

func (a *MaxIaReadSegmentCount) Output(model *api.Model) {
	model.MaxIaReadSegmentCount = a.max
}