package registry

import (
	"fmt"

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

type Engine interface {
	Load(Repr) (Process, error)
	Name() string
	InType() string
}

type convertedEngine[T any] struct {
	engine engine.Engine[T]
	name   string
	inType string
}

func (e convertedEngine[T]) InType() string { return e.inType }

func (e convertedEngine[T]) Name() string { return e.name }

func (e convertedEngine[T]) Load(r Repr) (Process, error) {
	t, ok := r.Data().(T)
	if !ok {
		return nil, fmt.Errorf("'ncorrent format '%s' for engine '%s'", r.ID(), e.inType)
	}

	process, err := e.engine(t)
	if err != nil {
		return nil, err
	}

	return convertedProcess[T]{process, e.inType}, nil
}

func RegisterEngine[T any](registry *Registry, e engine.Engine[T], name, inType string) error {
	if _, ok := registry.engines[name]; ok {
		return fmt.Errorf("engine '%s' already registered", name)
	}

	registry.engines[name] = &convertedEngine[T]{e, name, inType}
	return nil
}