package com.imyeyu.spring.service;

import com.imyeyu.java.bean.timi.TimiException;
import com.imyeyu.spring.bean.Page;
import com.imyeyu.spring.bean.PageResult;
import com.imyeyu.spring.entity.Deletable;
import com.imyeyu.spring.entity.Updatable;
import com.imyeyu.spring.mapper.BaseMapper;

/**
 * 抽象实体服务类
 *
 * @param <T> 实体类型
 * @param <P> 实体主键类型
 * @author 夜雨
 * @since 2025-05-14 17:06
 */
public abstract class AbstractEntityService<T, P> implements BaseService<T, P> {

	/** 基本 Mapper */
	protected BaseMapper<T, P> baseMapper;

	/**
	 * 获取 Mapper 实例
	 *
	 * @return Mapper 实例
	 */
	protected abstract BaseMapper<T, P> mapper();

	/** 检查 mapper */
	private void checkMapper() {
		if (baseMapper == null) {
			baseMapper = mapper();
		}
		TimiException.required(baseMapper, "mapper() can not be null");
	}

	@Override
	public PageResult<T> page(Page<T> page) {
		checkMapper();
		return baseMapper.selectPageResult(page);
	}

	public void create(T t) {
		checkMapper();
		if (t instanceof Updatable updatable) {
			updatable.setUpdatedAt(null);
		}
		if (t instanceof Deletable deletable) {
			deletable.setDeletedAt(null);
		}
		baseMapper.insert(t);
	}

	public T get(P id) {
		checkMapper();
		return baseMapper.select(id);
	}

	public void update(T t) {
		checkMapper();
		baseMapper.updateSelective(t);
	}

	public void delete(P p) {
		checkMapper();
		baseMapper.delete(p);
	}

	public void destroy(P p) {
		checkMapper();
		baseMapper.destroy(p);
	}
}