package com.xcong.farmer.cms.core.handler;
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import cn.hutool.core.collection.CollUtil;
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import cn.hutool.core.util.StrUtil;
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import com.baomidou.mybatisplus.core.metadata.IPage;
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import com.baomidou.mybatisplus.extension.plugins.pagination.Page;
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import com.xcong.farmer.cms.configurations.properties.CmsProperties;
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import com.xcong.farmer.cms.core.node.AttrNode;
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import com.xcong.farmer.cms.core.node.Template;
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import com.xcong.farmer.cms.core.tag.data.PageChildData;
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import com.xcong.farmer.cms.core.tag.data.PageData;
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import com.xcong.farmer.cms.core.tag.model.Article;
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import com.xcong.farmer.cms.core.tag.model.Pagination;
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import com.xcong.farmer.cms.modules.system.entity.ArticleEntity;
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import com.xcong.farmer.cms.modules.system.mapper.ArticleMapper;
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import com.xcong.farmer.cms.utils.SpringContextHolder;
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import lombok.extern.slf4j.Slf4j;
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import java.util.ArrayList;
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import java.util.List;
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/**
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* @author wzy
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* @date 2022-07-05
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**/
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@Slf4j
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public class PageDataParserHandler implements DataParserHandler {
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private ArticleMapper articleMapper = SpringContextHolder.getBean(ArticleMapper.class);
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private CmsProperties cmsProperties = SpringContextHolder.getBean(CmsProperties.class);
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@Override
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public void dataParser(AttrNode attrNode) {
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log.info("分页解析");
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Template.HAS_PAGING = true;
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Long companyId = (Long) attrNode.getSystemDataValue("companyId");
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Pagination param = (Pagination) attrNode.getParam();
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Page<ArticleEntity> page = new Page<>(Integer.parseInt(param.getPage()), Integer.parseInt(param.getLimit()));
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ArticleEntity article = new ArticleEntity();
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article.setColumnCode(param.getCode());
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article.setCompanyId(companyId);
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IPage<ArticleEntity> pageList = articleMapper.selectArticleInPage(page, article);
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PageData pageData = new PageData();
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pageData.setTotalPage((int) pageList.getPages());
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pageData.setIndex(Integer.parseInt(param.getPage()));
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pageData.setTotalCnt((int) pageList.getSize());
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if (CollUtil.isNotEmpty(pageList.getRecords())) {
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String path = cmsProperties.getBaseUrl() + "/" + param.getCode();
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String filename = "index_{}.html";
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List<PageChildData> list = new ArrayList<>();
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int pageNo = Integer.parseInt(param.getPage());
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// 计算出页面显示分页的最大和最小值
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int[] startAndEnd = pageStartAndEnd(pageNo, (int) pageList.getPages(), Integer.parseInt(param.getSize()));
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for (int i = startAndEnd[0]; i <= startAndEnd[1] ; i++) {
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PageChildData child = new PageChildData();
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child.setIndex(i);
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if (pageNo == 1) {
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child.setPath(path + "/index.html");
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} else {
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child.setPath(path + "/" + StrUtil.format(filename, i));
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}
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list.add(child);
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}
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pageData.setChildren(list);
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} else {
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pageData.setNext("javascript:void(0)");
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pageData.setPrev("javascript:void(0)");
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}
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if (Integer.parseInt(param.getPage()) == pageList.getPages()) {
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Template.HAS_PAGING = false;
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}
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attrNode.setData(pageData);
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}
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/**
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* (x + y)/2 = index
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* y - x= size 解二元一次方程 x-起点 y-终点
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*
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* @param index 当前页码
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* @param totalPage 总页数
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* @param size 分页大小
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* @return
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*/
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public int[] pageStartAndEnd(int index, int totalPage, int size) {
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int[] page = new int[2];
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int end = ((index * 2) + size) / 2;;
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int start = end - size + 1;
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if (start < 1) {
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start = 1;
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}
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if (end > totalPage) {
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end = totalPage;
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}
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page[0] = start;
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page[1] = end;
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return page;
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}
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}
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