package aggregate

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

	"github.com/pingcap/tidb/util/plancodec"
)

func AggPlan() Aggregator {
	return &Plan{}
}

type Plan struct {
	value string
}

func (a *Plan) Add(record *load.StmtRecord) {
	if a.value == "" {
		a.value = record.SamplePlan
	}
}

func (a *Plan) Merge(agg Aggregator) {
	if agg, ok := agg.(*Plan); ok {
		if a.value == "" {
			a.value = agg.value
		}
	}
}

func (a *Plan) Output(model *api.Model) {
	model.Plan, _ = plancodec.DecodePlan(a.value)
}