package aggregate

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

func AggSumLatency() Aggregator {
	return &SumLatency{}
}

type SumLatency struct {
	sum int64
}

var _ Aggregator = (*SumLatency)(nil)

func (a *SumLatency) Add(record *load.StmtRecord) {
	a.sum += record.SumLatency.Nanoseconds()
}

func (a *SumLatency) Merge(agg Aggregator) {
	if agg, ok := agg.(*SumLatency); ok {
		a.sum += agg.sum
	}
}

func (a *SumLatency) Output(model *api.Model) {
	model.SumLatency = int(a.sum)
}