package aggregate

import (
	"math"

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

func AggFirstSeen() Aggregator {
	return &FirstSeen{math.MaxInt64}
}

type FirstSeen struct {
	min int64
}

var _ Aggregator = (*FirstSeen)(nil)

func (a *FirstSeen) Add(record *load.StmtRecord) {
	if record.FirstSeen.Unix() < a.min {
		a.min = record.FirstSeen.Unix()
	}
}

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

func (a *FirstSeen) Output(model *api.Model) {
	model.FirstSeen = int(a.min)
}