/*
 * Copyright [2020-2030] [https://www.stylefeng.cn]
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Guns采用APACHE LICENSE 2.0开源协议，您在使用过程中，需要注意以下几点：
 *
 * 1.请不要删除和修改根目录下的LICENSE文件。
 * 2.请不要删除和修改Guns源码头部的版权声明。
 * 3.请保留源码和相关描述文件的项目出处，作者声明等。
 * 4.分发源码时候，请注明软件出处 https://gitee.com/stylefeng/guns
 * 5.在修改包名，模块名称，项目代码等时，请注明软件出处 https://gitee.com/stylefeng/guns
 * 6.若您的项目无法满足以上几点，可申请商业授权
 */
package cn.stylefeng.roses.kernel.db.api.factory;

import cn.hutool.core.util.ObjectUtil;
import cn.stylefeng.roses.kernel.rule.pojo.request.BaseRequest;
import cn.stylefeng.roses.kernel.rule.util.HttpServletUtil;
import com.baomidou.mybatisplus.extension.plugins.pagination.Page;

import javax.servlet.http.HttpServletRequest;

/**
 * 分页参数快速获取
 *
 * @author fengshuonan
 * @since 2020/10/17 17:33
 */
public class PageFactory {

    /**
     * 每页大小（默认20）
     */
    private static final String PAGE_SIZE_PARAM_NAME = "pageSize";

    /**
     * 第几页（从1开始）
     */
    private static final String PAGE_NO_PARAM_NAME = "pageNo";

    /**
     * 默认分页，在使用时PageFactory.defaultPage会自动获取pageSize和pageNo参数
     *
     * @author fengshuonan
     * @since 2020/3/30 16:42
     */
    public static <T> Page<T> defaultPage() {

        int pageSize = 20;
        int pageNo = 1;

        HttpServletRequest request = HttpServletUtil.getRequest();

        //每页条数
        String pageSizeString = request.getParameter(PAGE_SIZE_PARAM_NAME);
        if (ObjectUtil.isNotEmpty(pageSizeString)) {
            pageSize = Integer.parseInt(pageSizeString);
        }

        //第几页
        String pageNoString = request.getParameter(PAGE_NO_PARAM_NAME);
        if (ObjectUtil.isNotEmpty(pageNoString)) {
            pageNo = Integer.parseInt(pageNoString);
        }

        return new Page<>(pageNo, pageSize);
    }

    /**
     * 从baseRequest中获取分页参数
     *
     * @author fengshuonan
     * @since 2021/10/19 16:05
     */
    public static <T> Page<T> defaultPage(BaseRequest baseRequest) {
        int pageSize = 20;
        int pageNo = 1;

        if (ObjectUtil.isNotEmpty(baseRequest)) {
            pageNo = baseRequest.getPageNo() == null ? pageNo : baseRequest.getPageNo();
            pageSize = baseRequest.getPageSize() == null ? pageSize : baseRequest.getPageSize();
        }
        return new Page<>(pageNo, pageSize);
    }

}
