package registry

import (
	"fmt"

	"github.com/vasyakrg/dns-autoresolver/internal/provider"
)

// Registry resolves providers by name.
type Registry struct {
	m map[string]provider.Provider
}

func New() *Registry {
	return &Registry{m: make(map[string]provider.Provider)}
}

func (r *Registry) Register(p provider.Provider) {
	r.m[p.Name()] = p
}

func (r *Registry) ByName(name string) (provider.Provider, error) {
	p, ok := r.m[name]
	if !ok {
		return nil, fmt.Errorf("registry: unknown provider %q", name)
	}
	return p, nil
}