package registry

import (
	"net/http"

	"github.com/docker/docker/cliconfig"
)

type Service struct {
	Config *ServiceConfig
}

// NewService returns a new instance of Service ready to be
// installed no an engine.
func NewService(options *Options) *Service {
	return &Service{
		Config: NewServiceConfig(options),
	}
}

// Auth contacts the public registry with the provided credentials,
// and returns OK if authentication was sucessful.
// It can be used to verify the validity of a client's credentials.
func (s *Service) Auth(authConfig *cliconfig.AuthConfig) (string, error) {
	addr := authConfig.ServerAddress
	if addr == "" {
		// Use the official registry address if not specified.
		addr = IndexServerAddress()
	}
	index, err := s.ResolveIndex(addr)
	if err != nil {
		return "", err
	}
	endpoint, err := NewEndpoint(index, nil)
	if err != nil {
		return "", err
	}
	authConfig.ServerAddress = endpoint.String()
	return Login(authConfig, endpoint)
}

// Search queries the public registry for images matching the specified
// search terms, and returns the results.
func (s *Service) Search(term string, authConfig *cliconfig.AuthConfig, headers map[string][]string) (*SearchResults, error) {
	repoInfo, err := s.ResolveRepository(term)
	if err != nil {
		return nil, err
	}

	// *TODO: Search multiple indexes.
	endpoint, err := repoInfo.GetEndpoint(http.Header(headers))
	if err != nil {
		return nil, err
	}
	r, err := NewSession(endpoint.client, authConfig, endpoint)
	if err != nil {
		return nil, err
	}
	return r.SearchRepositories(repoInfo.GetSearchTerm())
}

// ResolveRepository splits a repository name into its components
// and configuration of the associated registry.
func (s *Service) ResolveRepository(name string) (*RepositoryInfo, error) {
	return s.Config.NewRepositoryInfo(name)
}

// ResolveIndex takes indexName and returns index info
func (s *Service) ResolveIndex(name string) (*IndexInfo, error) {
	return s.Config.NewIndexInfo(name)
}