package registry

import (
	"git.maximhutz.com/max/lambda/pkg/engine"
)

// A Process is a type-erased reduction process that operates on Expr values.
type Process interface {
	engine.Process[Expr]

	// InType returns the name of the representation this process operates on.
	InType() string
}

// A registeredProcess adapts a typed engine.Process[T] into the type-erased
// Process interface. It wraps the result of Get into an Expr.
type registeredProcess[T any] struct {
	process engine.Process[T]
	inType  string
}

func (p registeredProcess[T]) InType() string { return p.inType }

func (p registeredProcess[T]) Get() (Expr, error) {
	s, err := p.process.Get()
	if err != nil {
		return nil, err
	}

	return NewExpr(p.inType, s), nil
}

func (p registeredProcess[T]) Step(i int) bool {
	return p.process.Step(i)
}