package grpc

import (
	"golang.org/x/net/context"
	"google.golang.org/grpc/metadata"
	"src.dualinventive.com/go/lib/dilog"
	"src.dualinventive.com/go/mtinfo-go"
	"src.dualinventive.com/go/users-service/internal/storage"
	"src.dualinventive.com/go/users-service/internal/users"
)

//Server is a structure of server instance
type Server struct {
	Name        string
	UserService *users.UserService
}

//NewServer creates new instance of Server
func NewServer(
	logger dilog.Logger,
	userRepository storage.UserRepository,
	mtinfoClient *mtinfo.Client,
) (*Server, error) {
	server := &Server{
		Name: "authentication-service-grpc",
		UserService: &users.UserService{
			Logger:         logger,
			UserRepository: userRepository,
			Mtinfo:         mtinfoClient,
		},
	}
	return server, nil
}

//GetUserByID returns a user found by the given ID
func (s *Server) GetUserByID(ctx context.Context, req *GetUserByIDRequest) (*GetUserByIDResponse, error) {
	user, err := s.UserService.GetUserByID(getValue(ctx, "token"), req.UserID)
	if err != nil {
		return nil, mapError(err)
	}

	return &GetUserByIDResponse{User: mapUser(user)}, nil
}

//ListUsers returns a list of users found by the given filter
func (s *Server) ListUsers(ctx context.Context, req *ListUsersRequest) (
	*ListUsersResponse, error) {

	users, count, err := s.UserService.ListUsers(
		getValue(ctx, "token"), mapFilter(req.Filter), req.Page, req.PerPage, mapSortCol(req.Sort),
	)
	if err != nil {
		return nil, mapError(err)
	}

	return &ListUsersResponse{Users: mapUsers(users), Count: count}, nil
}

func getValue(ctx context.Context, s string) string { //nolint: unparam
	md, ok := metadata.FromIncomingContext(ctx)
	if !ok {
		return ""
	}

	raw := md.Get(s)
	if raw == nil {
		return ""
	}

	if len(raw) == 0 {
		return ""
	}

	return raw[0]
}