hit-server-manager/backend/src/main/java/com/hitcommunications/servermanager/services/ServersService.java

package com.hitcommunications.servermanager.services;

import com.hitcommunications.servermanager.mappers.ServersMapper;
import com.hitcommunications.servermanager.model.Servers;
import com.hitcommunications.servermanager.model.dtos.NewServerDTO;
import com.hitcommunications.servermanager.model.dtos.ServerDTO;
import com.hitcommunications.servermanager.model.enums.Applications;
import com.hitcommunications.servermanager.model.enums.ServersType;
import com.hitcommunications.servermanager.repositories.ServersRepository;
import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;

import java.util.HashMap;
import java.util.List;
import java.util.Map;

@Service
@RequiredArgsConstructor
public class ServersService {
    private final ServersMapper mapper;
    private final ServersRepository repo;

    public ServerDTO create(NewServerDTO createDTO) {
        // Check if server with same IP and port already exists
        repo.findByIpAndPort(createDTO.ip(), createDTO.port()).ifPresent(entity -> {
            throw new RuntimeException("Server already exists with IP: " + createDTO.ip() + " and port: " + createDTO.port());
        });

        Servers entity = mapper.toEntity(createDTO);
        entity = repo.save(entity);
        return mapper.toDTO(entity);
    }

    public ServerDTO getById(String id) {
        return repo.findById(id)
                .map(mapper::toDTO)
                .orElseThrow(() -> new RuntimeException("Server not found with id: " + id));
    }

    public ServerDTO getByName(String name) {
        return repo.findByName(name)
                .map(mapper::toDTO)
                .orElseThrow(() -> new RuntimeException("Server not found with name: " + name));
    }

    public List<ServerDTO> getByType(ServersType type) {
        return repo.findByType(type)
                .stream()
                .map(mapper::toDTO)
                .toList();
    }

    public Map<ServersType, Integer> countAllByType() {
        Map<ServersType, Integer> response  = new HashMap<>();

        for(ServersType type : ServersType.values()) {
            response.put(type, repo.countAllByType(type));
        }

        return response;
    }

    public List<ServerDTO> getByApplication(Applications application) {
        return repo.findByApplication(application)
                .stream()
                .map(mapper::toDTO)
                .toList();
    }

    public List<ServerDTO> getAll() {
        return repo.findAll()
                .stream()
                .map(mapper::toDTO)
                .toList();
    }

    public ServerDTO update(String id, NewServerDTO updateDTO) {
        Servers entity = repo.findById(id)
                .orElseThrow(() -> new RuntimeException("Server not found with id: " + id));

        // Check if IP/port combination already exists (excluding current server)
        repo.findByIpAndPort(updateDTO.ip(), updateDTO.port()).ifPresent(existingServer -> {
            if (!existingServer.getId().equals(id)) {
                throw new RuntimeException("Server already exists with IP: " + updateDTO.ip() + " and port: " + updateDTO.port());
            }
        });

        mapper.partialUpdate(updateDTO, entity);
        entity = repo.save(entity);
        return mapper.toDTO(entity);
    }

    public void delete(String id) {
        if (!repo.existsById(id)) {
            throw new RuntimeException("Server not found with id: " + id);
        }
        repo.deleteById(id);
    }
}