feat: move entity and usecase to root folder

usecase/user/service.go

@@ -0,0 +1,69 @@
+package user
+
+import (
+	"strings"
+	"time"
+
+	"github.com/eminetto/clean-architecture-go-v2/entity"
+)
+
+//Service  interface
+type Service struct {
+	repo Repository
+}
+
+//NewService create new use case
+func NewService(r Repository) *Service {
+	return &Service{
+		repo: r,
+	}
+}
+
+//CreateUser Create an user
+func (s *Service) CreateUser(email, password, firstName, lastName string) (entity.ID, error) {
+	e, err := entity.NewUser(email, password, firstName, lastName)
+	if err != nil {
+		return e.ID, err
+	}
+	return s.repo.Create(e)
+}
+
+//GetUser Get an user
+func (s *Service) GetUser(id entity.ID) (*entity.User, error) {
+	return s.repo.Get(id)
+}
+
+//SearchUsers Search users
+func (s *Service) SearchUsers(query string) ([]*entity.User, error) {
+	return s.repo.Search(strings.ToLower(query))
+}
+
+//ListUsers List users
+func (s *Service) ListUsers() ([]*entity.User, error) {
+	return s.repo.List()
+}
+
+//DeleteUser Delete an user
+func (s *Service) DeleteUser(id entity.ID) error {
+	u, err := s.GetUser(id)
+	if u == nil {
+		return entity.ErrNotFound
+	}
+	if err != nil {
+		return err
+	}
+	if len(u.Books) > 0 {
+		return entity.ErrCannotBeDeleted
+	}
+	return s.repo.Delete(id)
+}
+
+//UpdateUser Update an user
+func (s *Service) UpdateUser(e *entity.User) error {
+	err := e.Validate()
+	if err != nil {
+		return entity.ErrInvalidEntity
+	}
+	e.UpdatedAt = time.Now()
+	return s.repo.Update(e)
+}