package discovery

import (
	"net/url"
	"os"
)

var Default = NewService()

type Provider interface {
	Discover(serviceUrn string) (*url.URL, error)
}

type Service struct {
	token     string
	providers []Provider
}

func (s *Service) Discover(serviceUrn string) (*url.URL, error) {
	for idx := range s.providers {
		provider := s.providers[idx]
		u, err := provider.Discover(serviceUrn)
		if err == nil {
			return u, nil
		}
	}

	return nil, os.ErrNotExist
}

func (s *Service) WithToken(token string) *Service {
	s.token = token
	return s
}

func (s *Service) WithProvider(provider Provider) *Service {
	s.providers = append(s.providers, provider)
	return s
}

func NewService() *Service {
	return &Service{
		providers: []Provider{
			NewLocalDiscovery(),
		},
	}
}