package treerack

type registry struct {
	idSeed      int
	definitions map[string]definition
}

func newRegistry(defs ...definition) *registry {
	r := &registry{
		definitions: make(map[string]definition),
	}

	for _, def := range defs {
		r.setDefinition(def)
	}

	return r
}

func (r *registry) definition(name string) (definition, bool) {
	d, ok := r.definitions[name]
	return d, ok
}

func (r *registry) setDefinition(d definition) error {
	if _, ok := r.definitions[d.nodeName()]; ok {
		return duplicateDefinition(d.nodeName())
	}

	r.idSeed++
	id := r.idSeed
	d.setID(id)

	r.definitions[d.nodeName()] = d
	return nil
}

func (r *registry) getDefinitions() []definition {
	var defs []definition
	for _, def := range r.definitions {
		defs = append(defs, def)
	}

	return defs
}