package aggregate

import (
	"math"

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

func AggSummaryEndTime() Aggregator {
	return &SummaryEndTime{math.MinInt64}
}

type SummaryEndTime struct {
	end int64
}

var _ Aggregator = (*SummaryEndTime)(nil)

func (a *SummaryEndTime) Add(record *load.StmtRecord) {
	if record.End > a.end {
		a.end = record.End
	}
}

func (a *SummaryEndTime) Merge(agg Aggregator) {
	if agg, ok := agg.(*SummaryEndTime); ok {
		if agg.end > a.end {
			a.end = agg.end
		}
	}
}

func (a *SummaryEndTime) Output(model *api.Model) {
	model.EndTime = int(a.end)
}