package ru.dxunvrs.todo.service;

import lombok.RequiredArgsConstructor;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import ru.dxunvrs.todo.dto.TaskCreateRequest;
import ru.dxunvrs.todo.dto.TaskResponse;
import ru.dxunvrs.todo.dto.TaskUpdateRequest;
import ru.dxunvrs.todo.entity.Task;
import ru.dxunvrs.todo.exception.TaskNotFoundException;
import ru.dxunvrs.todo.mapper.TaskMapper;
import ru.dxunvrs.todo.repository.TaskRepository;

@Service
@RequiredArgsConstructor
public class TaskServiceImpl implements TaskService {

    private final TaskRepository taskRepository;
    private final TaskMapper taskMapper;

    @Override
    @Transactional(readOnly = true)
    public TaskResponse getById(Long id) {
        Task task = taskRepository.findById(id)
                .orElseThrow(() -> new TaskNotFoundException("Task not found with id: " + id));
        return taskMapper.toResponse(task);
    }

    @Override
    @Transactional
    public TaskResponse create(TaskCreateRequest request) {
        Task task = taskMapper.toEntity(request);
        Task saved = taskRepository.save(task);
        return taskMapper.toResponse(saved);
    }

    @Override
    @Transactional
    public TaskResponse update(Long id, TaskUpdateRequest request) {
        Task task = taskRepository.findById(id)
                .orElseThrow(() -> new TaskNotFoundException("Task not found with id: " + id));
        taskMapper.updateEntity(task, request);
        Task updated = taskRepository.save(task);
        return taskMapper.toResponse(updated);
    }

    @Override
    @Transactional
    public void delete(Long id) {
        if (!taskRepository.existsById(id)) {
            throw new TaskNotFoundException("Task not found with id: " + id);
        }
        taskRepository.deleteById(id);
    }
}