package org.springblade.core.mp.resolver;

import com.baomidou.mybatisplus.core.metadata.OrderItem;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
import org.springblade.core.tool.utils.ObjectUtil;
import org.springblade.core.tool.utils.StringPool;
import org.springblade.core.tool.utils.StringUtil;
import org.springframework.core.MethodParameter;
import org.springframework.lang.NonNull;
import org.springframework.web.bind.support.WebDataBinderFactory;
import org.springframework.web.context.request.NativeWebRequest;
import org.springframework.web.method.support.HandlerMethodArgumentResolver;
import org.springframework.web.method.support.ModelAndViewContainer;

/**
 * 解决 Mybatis Plus page SQL注入问题
 *
 * @author L.cm
 */
public class PageArgumentResolver implements HandlerMethodArgumentResolver {
	private static final String ORDER_ASC = "asc";

	@Override
	public boolean supportsParameter(MethodParameter parameter) {
		return Page.class.equals(parameter.getParameterType());
	}

	/**
	 * page 参数解析
	 *
	 * @param parameter     MethodParameter
	 * @param mavContainer  ModelAndViewContainer
	 * @param request       NativeWebRequest
	 * @param binderFactory WebDataBinderFactory
	 * @return 检查后新的page对象
	 */
	@Override
	public Object resolveArgument(@NonNull MethodParameter parameter, ModelAndViewContainer mavContainer,
								  NativeWebRequest request, WebDataBinderFactory binderFactory) {
		// 分页参数 page: 0, size: 10, sort=id%2Cdesc
		String pageParam = request.getParameter("page");
		String sizeParam = request.getParameter("size");
		String[] sortParam = request.getParameterValues("sort");
		Page<?> page = new Page<>();
		if (StringUtil.isNotBlank(pageParam)) {
			page.setCurrent(Long.parseLong(pageParam));
		}
		if (StringUtil.isNotBlank(sizeParam)) {
			page.setSize(Long.parseLong(sizeParam));
		}
		if (ObjectUtil.isEmpty(sortParam)) {
			return page;
		}
		for (String param : sortParam) {
			if (StringUtil.isBlank(param)) {
				continue;
			}
			String[] split = param.split(StringPool.COMMA);
			// 清理字符串
			OrderItem orderItem = new OrderItem();
			orderItem.setColumn(StringUtil.cleanIdentifier(split[0]));
			orderItem.setAsc(isOrderAsc(split));
			page.addOrder(orderItem);
		}
		return page;
	}

	private static boolean isOrderAsc(String[] split) {
		// 默认 desc
		if (split.length < 2) {
			return false;
		}
		return ORDER_ASC.equalsIgnoreCase(split[1]);
	}
}