package executer

import (
	"log/slog"

	"git.maximhutz.com/max/lambda/internal/config"
	"git.maximhutz.com/max/lambda/pkg/emitter"
	"git.maximhutz.com/max/lambda/pkg/lambda"
)

type Executor struct {
	Config     *config.Config
	Expression *lambda.Expression
	emitter.Emitter
}

func New(config *config.Config, expression *lambda.Expression) *Executor {
	return &Executor{Config: config, Expression: expression}
}

func (e Executor) Run() {
	e.Emit("start")

	for lambda.ReduceOnce(e.Expression) {
		e.Emit("step")
		if e.Config.Verbose {
			slog.Info("reduction", "tree", lambda.Stringify(*e.Expression))
		}
	}

	e.Emit("end")
}