created facade and implemented functions for controller

application/module-language-school/src/main/java/org/fuseri/modulelanguageschool/user/UserFacade.java

+package org.fuseri.modulelanguageschool.user;
+
+import org.fuseri.model.dto.common.Result;
+import org.fuseri.model.dto.user.UserAddLanguageDto;
+import org.fuseri.model.dto.user.UserCreateDto;
+import org.fuseri.model.dto.user.UserDto;
+import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.stereotype.Service;
+import org.springframework.transaction.annotation.Transactional;
+
+@Service
+@Transactional
+public class UserFacade {
+
+    private final UserMapper mapper;
+
+    private final UserService service;
+
+    @Autowired
+    public UserFacade(UserMapper mapper, UserService service) {
+        this.mapper = mapper;
+        this.service = service;
+    }
+
+    public UserDto find(Long id) {
+        return mapper.toDto(service.find(id));
+    }
+
+    public UserDto create(UserCreateDto dto) {
+        var user = mapper.fromCreateDto(dto);
+        return mapper.toDto(service.create(user));
+
+    }
+
+    public void delete(Long id) {
+        service.delete(id);
+    }
+
+    public UserDto update(Long id, UserCreateDto dto) {
+        var user = mapper.fromCreateDto(dto);
+        user.setId(id);
+        var result = service.update(user);
+        return mapper.toDto(result);
+
+    }
+
+    public Result<UserDto> findAll(int page) {
+        return mapper.toResult(service.findAll(page));
+    }
+
+    public UserDto addLanguage(Long id, UserAddLanguageDto body) {
+        var user = service.find(id);
+        var languages = user.getLanguages();
+        var proficiencies = user.getProficiencyLevels();
+        var language = body.getLanguage();
+        var level = body.getProficiency();
+        languages.add(language);
+        proficiencies.add(level);
+        user.setLanguages(languages);
+        user.setProficiencyLevels(proficiencies);
+        return mapper.toDto(service.update(user));
+    }
+}