package aggregate

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

func AggMaxWru() Aggregator {
	return &MaxWru{}
}

type MaxWru struct {
	max float64
}

var _ Aggregator = (*MaxWru)(nil)

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

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

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