<?php
namespace app\common;
use think\Db;
use app\common\LatexTable;
/**
 * LaTeX内容生成类
 */
class LatexContent{
    //期刊相关的信息
    private $iYear = 2025;//年
    private $iPeriod = 1;//期
    private $sAbbr = 'tmr';//期刊缩写
    private $sWebsite = 'https://www.tmrjournals.com/tmr';//期刊官网
    //模版地址
    private $sLatexUrl = '/public/latex/';
    //期刊官网接口地址
    private $sJournalUrl = 'http://zmzm.journal.dev.com/';//'http://journalapi.tmrjournals.com/public/index.php/';//
    //文章图片
    private $sArticleIcon = '/public/articleicon/';
    //文章图片
    private $sArticleMainImage = '/public/articleImage/';
    //编辑系统URL
    private $sSubmissionUrl = 'https://submission.tmrjournals.com/';
    //图片模版
    private $sImageTempalte = '\begin{figure}[hbt!]
        \centering
        \includegraphics[width=0.75\linewidth]{{{img_url}}}
        \caption{{{img_title}}}
        \label{{{img_fig_sim}}}
    \end{figure}' ;
    //首页内容
    private $sFirst = '\documentclass[
journal={{journal_abbr}},
journalname={{{{journal_title}}}},
layout=largetwo,
year={{stage_year}},%年
volume={{stage_vol}},%卷
no={{stage_no}},%期
page={{stage_page}},%号
]{tmr-tex}

\doi{{{doi}}}
\journalweb{{{website}}}

% \def\ORCIdICONNAME{{{CLSFILEURL}}/orcid_icon.png} %定义ORCID图片
% \def\TMRLOGONAME{{{CLSFILEURL}}/tmr-logo.pdf} % 定义期刊LOGO图片

\usepackage{amsmath}
\usepackage[nopatch]{microtype}
\usepackage{booktabs}
\usepackage[backend=biber]{biblatex}
\usepackage{xcolor}         % 蓝色字体（参考文献）
\usepackage{multirow}       % 单元格合并（必选）
\usepackage{array}          % 列格式居中（必选）
\usepackage{geometry}       % 页面适配，避免内容溢出
\addbibresource{example.bib}

\title{{{article_title}}}

{{author_info}}

\addbibresource{example.bib}

{{correspondence_info}}


\keywords{keyword entry 1, keyword entry 2, keyword entry 3} %% First letter not capped

{{author_contribution}}
\competinginterests{The authors declare no conflicts of interest.}
{{article_acknowledgment}}
\Peerreviewinformation{{{journal_title}} thanks all anonymous reviewers for their contribution to the peer review of this paper}
{{article_abbreviation}}
{{article_cite}}
\received{{{received_date}}}
\revised{{{revision_date}}}
\accepted{{{accepted_date}}}
\Availableonline{{{pub_date}}}
{{executive_editor}}
{{abstract}}
{{keywords}}


{{article_icon}}';
    //正文内容
   private $sMain = '\begin{document}
    \twocolumn
    {{tmr_highlight}}
    {{article_main}} 
\end{document}';
    /**
     * 生成初稿-基本内容
     * @param article_id 文章ID
     */
    public function buildFirst($aProductionArticle = []){

        //获取模版
        $sTemplateInfo = $this->sFirst;

        //查询期刊信息
        $iJournalId = empty($aProductionArticle['journal_id']) ? 0 : $aProductionArticle['journal_id'];
        if(!empty($iJournalId)){
            $aWhere = ['journal_id' => $iJournalId,'state' => 0];
            $aJournal = Db::name('journal')->where($aWhere)->find();
            if(!empty($aJournal)){
                //获取编辑信息
                $aWhere = ['user_id' => $aJournal['editor_id'],'state' => 0];
                $aUser = Db::name('user')->field('realname')->where($aWhere)->find();
            }
        }
        //子刊信息
        $iJournalStageId = empty($aProductionArticle['journal_stage_id']) ? 0 : $aProductionArticle['journal_stage_id'];
        if(!empty($iJournalStageId)){
            $aJournalStage = $this->getJournalStage(['journal_stage_id' => $iJournalStageId]);
            $aJournalStage = empty($aJournalStage['data']) ? [] : $aJournalStage['data'];
        }

        //期刊简写
        $sAbbr = empty($aJournal['abbr']) ? $this->sAbbr : $aJournal['abbr'];
        $sAbbr = strtolower($sAbbr);
        $sJournalTitle = empty($aJournal['title']) ? '' : $aJournal['title'];
        //年
        $iYear = empty($aJournalStage['stage_year']) ? date('Y') : $aJournalStage['stage_year'];
        //卷
        $iVolume = empty($aJournalStage['stage_vol']) ? 0 : $aJournalStage['stage_vol'];
        //期
        $iPeriod = empty($aJournalStage['stage_no']) ? 0 : $aJournalStage['stage_no'];
        //页
        $sPage = empty($aJournalStage['stage_page']) ? '' : $aJournalStage['stage_page'];

        //期刊web
        $sWebsite = empty($aJournal['website']) ? $this->sWebsite : $aJournal['website'];
        $aSearch = ['{{journal_abbr}}' => $sAbbr,'{{stage_year}}' => $iYear,'{{stage_vol}}' => $iVolume,'{{stage_no}}' => $iPeriod,'{{stage_page}}' => $sPage,'{{website}}' => $sWebsite,'{{journal_title}}' => $sJournalTitle];

        //获取DOI
        $aSearch['{{doi}}'] = empty($aProductionArticle['doi']) ? '' : $aProductionArticle['doi'];

        //获取作者信息
        $aAuthoInfo = $this->dealAuthor(['p_article_id' => $aProductionArticle['p_article_id']]);
        $aSearch['{{author_info}}'] = empty($aAuthoInfo['author']) ? '' : $aAuthoInfo['author'];
        //通讯作者信息
        $aSearch['{{correspondence_info}}'] = empty($aAuthoInfo['correspondence']) ? '' : '\Correspondence{'.$aAuthoInfo['correspondence'].'}';

        //文章基本信息处理
        //标题
        $sTitle = empty($aProductionArticle['title']) ? '' :  $this->dealContent($aProductionArticle['title']);
        if(!empty($sTitle)){
            if(!empty($aProductionArticle['ltai'])){
                $aLtai = explode(',', $aProductionArticle['ltai']);
                foreach ($aLtai as $key => $value) {
                   if(empty($value)){
                        continue;
                   }
                   $sTitle = str_replace($value, '\textit{'.$value.'}', $sTitle);
                }
            }
        }
        $aSearch['{{article_title}}'] = $sTitle;
        //author_contribution
        $aSearch['{{author_contribution}}'] = empty($aProductionArticle['author_contribution']) ? '' :  '\authorcontributions{'.$this->dealContent($aProductionArticle['author_contribution']).'}';
        //acknowledgment
        $aSearch['{{article_acknowledgment}}'] = empty($aProductionArticle['acknowledgment']) ? '' :  '\Acknowledgments{'.$this->dealContent($aProductionArticle['acknowledgment']).'}';
         //abbreviation
        $aSearch['{{article_abbreviation}}'] = empty($aProductionArticle['abbreviation']) ? '' :  '\Abbreviations{'.$this->dealContent($aProductionArticle['abbreviation']).'}';

        //文章引用信息
        $sCite = $this->getArticleCite($aProductionArticle,$aJournal,$aJournalStage);
        $aSearch['{{article_cite}}'] = empty($sCite) ? '' :  '\Citation{'.$sCite.'}';

        //获取文章时间
        $aTime = $this->getArticleTime(['article_id' => $aProductionArticle['article_id']]);
        $aTime = empty($aTime['data']) ? [] : $aTime['data'];
        $aSearch['{{received_date}}'] = empty($aTime['received_date']) ? '' : $aTime['received_date'];
        $aSearch['{{revision_date}}'] = empty($aTime['revision_date']) ? '' : $aTime['revision_date'];
        $aSearch['{{accepted_date}}'] = empty($aTime['accepted_date']) ? '' : $aTime['accepted_date'];
        $aSearch['{{pub_date}}'] = empty($aProductionArticle['pub_date']) ? '' : $aProductionArticle['pub_date'];

        //获取编辑信息
        $aSearch['{{executive_editor}}'] = empty($aUser['realname']) ? '' : '\Executiveeditor{'.$this->dealContent($aUser['realname']).'}';

        //摘要替换
        $sAbstract = empty($aProductionArticle['abstract']) ? '' : $this->dealContent($aProductionArticle['abstract']);
        if(!empty($sAbstract)){
            $aRelace = ['Background:' => '\textcolor[HTML]{0070C0}{\textbf{Background:}}','Methods:' => '\textcolor[HTML]{0070C0}{\textbf{Methods:}}','Results:' => '\textcolor[HTML]{0070C0}{\textbf{Results:}}','Conclusion:' => '\textcolor[HTML]{0070C0}{\textbf{Conclusion:}}'];
            $sAbstract = str_replace(array_keys($aRelace), array_values($aRelace), $sAbstract);
            $sAbstract = '\tmrabstract{'.$sAbstract.'}';
        }
        $aSearch['{{abstract}}'] = $sAbstract;
        //关键词
        $sKeywords = empty($aProductionArticle['keywords']) ? '' : '\keywords{'.$this->dealContent($aProductionArticle['keywords']).'}';
        $aSearch['{{keywords}}'] = $sKeywords;

        //文章图片地址
        $sIcon = empty($aProductionArticle['icon']) ? '' : $aProductionArticle['icon'];
        if(!empty($sIcon)){
            // $sIconUrl = rtrim(ROOT_PATH).$this->sArticleIcon.'/'.$sIcon;
            // if(file_exists($sIconUrl)){
            //     $sIcon = '\KeywordImage{'.$sIconUrl.'}'; 
            // }else{
            //     $sIcon = '';
            // }
            //下载图片
            $sImagePath = trim($this->sSubmissionUrl,'/').$this->sArticleIcon.'/'.$sIcon;
            $aImageInfo = $this->getImage($sImagePath,$aProductionArticle['p_article_id']);
            if(!empty($aImageInfo['data'])){
                $sIcon = '\KeywordImage{'.$aImageInfo['data'].'}'; 
            }else{
                $sIcon = '';
            }
        }
        $aSearch['{{article_icon}}'] = $sIcon;
        $aSearch['{{keywords}}'] = $sKeywords;
        $aSearch['{{CLSFILEURL}}'] = ROOT_PATH.'public/latex/cls';
        //模版内容替换
        $sTemplateInfo = str_replace(array_keys($aSearch), array_values($aSearch), $sTemplateInfo);
        //返回内容
        return ['status' => 1,'msg' => 'success','data' => $sTemplateInfo];
    }
    /**
     * 生成初稿-主内容
     * @param article_id 文章ID
     */
    public function buildMain($aProductionArticle = []){

        //获取模版
        $sTemplateInfo = $this->sMain;

        //数据替换
        $aSearch = ['{{tmr_highlight}}' => '','{{article_main}}' => ''];
        $sHighlight = '';
        if($aProductionArticle['journal_id'] == 1){//tmr独有
            $tradition_tag = empty($aProductionArticle['tradition_tag']) ? '' : strtolower( $aProductionArticle['tradition_tag']);
            $tradition = empty($aProductionArticle['tradition']) ? '' : $this->dealContent($aProductionArticle['tradition']);
            $pattern = '/<em[^>]*>(.*?)<\/em>/is';
            $replacement = '\\emph{$1}';
            // $tradition = preg_replace($pattern, $replacement, $tradition);
            if(in_array($tradition_tag, ['highlight','highlights']) && !empty($tradition)){
                $sHighlight .= '\highlightitem{Highlights}{'.$tradition.'}'."\n";
            }
            $mhoo = empty($aProductionArticle['mhoo']) ? '' : $this->dealContent( $aProductionArticle['mhoo']);
            $mhoo = preg_replace($pattern, $replacement, $mhoo);
            if(!empty($mhoo)){
                $sHighlight .= '\highlightitem{Medical history of objective}{'.$mhoo.'}'."\n";
            }
        }
        $aSearch['{{tmr_highlight}}'] = empty($sHighlight) ? '' : '\begin{highlight}'."\n".$sHighlight."\n".'\end{highlight}'."\n";

        //查询正文信息
        // $aProductionArticle['article_id'] = 4477;
        $aWhere = ['article_id' => $aProductionArticle['article_id'],'state' => 0];
        $aArticleMain = Db::name('article_main')->field('am_id,article_id,type,content,ami_id,amt_id,is_h1,is_h2,is_h3,sort')->where($aWhere)->order('sort')->select();
        if(!empty($aArticleMain)){

            //查询图片
            $aAmiId = array_unique(array_column($aArticleMain, 'ami_id'));
            $aWhere = ['ami_id' => ['in',$aAmiId],'state' => 0];
            $aArticleMainImage = Db::name('article_main_image')->field('ami_id,url,note')->where($aWhere)->select();
            $aArticleMainImage = empty($aArticleMainImage) ? [] : array_column($aArticleMainImage, null,'ami_id');
            //查询表格
            $aAmtId = array_unique(array_column($aArticleMain, 'amt_id'));
            $aWhere = ['amt_id' => ['in',$aAmtId],'state' => 0];
            $aArticleMainTable = Db::name('article_main_table')->field('amt_id,type,table_data,url,title,note')->where($aWhere)->select();
            $aArticleMainTable = empty($aArticleMainTable) ? [] : array_column($aArticleMainTable, null,'amt_id');
            //获取图片模版
            $sImageTempalte = $this->sImageTempalte;
            //数据处理
            $iStart = 0;
            $sMain = '';
            $oLatexTable = new LaTeXTable;
            foreach ($aArticleMain as $key => $value) {
                if(empty($iStart)){
                    if($value['is_h1'] == 0){
                        continue;
                    }else{
                        $iStart = $value['am_id'];
                    }
                }
                if($value['am_id'] >= $iStart){
                    if($value['is_h1'] == 1){
                        if(empty($value['content'])){
                            continue;
                        }
                        $sMain .= '\section{'.$this->dealContent($value['content']).'}'."\n";
                    }
                    if($value['is_h2'] == 1){
                        if(empty($value['content'])){
                            continue;
                        }
                        $sMain .= '\subsection{'.$this->dealContent($value['content']).'}'."\n";
                    }
                    if($value['is_h3'] == 1){
                        if(empty($value['content'])){
                            continue;
                        }
                        $sMain .= '\subsubsection{'.$this->dealContent($value['content']).'}'."\n";
                    }
                    if($value['is_h1'] == 0 && $value['is_h2'] == 0 && $value['is_h3'] == 0){
                        if($value['type'] == 0 ){
                            $sMain .= $this->dealContent($value['content'])."\\par\n";
                        }
                        if($value['type'] == 1 ){//图片
                            $aImageInfo = empty($aArticleMainImage[$value['ami_id']]) ? [] : $aArticleMainImage[$value['ami_id']];
                            if(empty($aImageInfo['url'])){
                                continue;
                            }

                            // $sIconUrl = rtrim(ROOT_PATH).$this->sArticleIcon.'/'.$sIcon;
                            // if(file_exists($sIconUrl)){
                            //     $sIcon = '\KeywordImage{'.$sIconUrl.'}'; 
                            // }else{
                            //     $sIcon = '';
                            // }
                            //下载图片
                            $sImagePath = trim($this->sSubmissionUrl,'/').$this->sArticleMainImage.'/'.$aImageInfo['url'];
                            $aResult = $this->getImage($sImagePath,$aProductionArticle['p_article_id']);
                            if(empty($aResult['data'])){
                                continue;
                            }
                            $aImageSearch = ['{{img_url}}' => $aResult['data'],'{{img_title}}' => $aImageInfo['note'],'{{img_fig_sim}}' => 'img_fig_sim_'.$value['ami_id']];
                            $sImageTempalteInfo = str_replace(array_keys($aImageSearch), array_values($aImageSearch), $sImageTempalte);
                            $sMain .= $sImageTempalteInfo."\\par\n";
                        }
                        if($value['type'] == 2 ){//表格
                            continue;
                        }
                    }
                }
            }
        }

        $aSearch['{{article_main}}'] = empty($sMain) ? '' : $sMain."\n";
        //模版内容替换
        $sTemplateInfo = str_replace(array_keys($aSearch), array_values($aSearch), $sTemplateInfo);
        //返回内容
        return ['status' => 1,'msg' => 'success','data' => $sTemplateInfo];
    }
     /**
     * 生成初稿-作者信息
     */
    private function dealAuthor($aParam = []){

        // 获取作者信息
        $aParam = empty($aParam) ? $this->request->post() : $aParam;
        //必填值验证
        $iPArticleId = empty($aParam['p_article_id']) ? '' : $aParam['p_article_id'];
        if(empty($iPArticleId)){
            return json_encode(array('status' => 2,'msg' => 'Please select an article' ));
        }

        //
        //查询作者信息
        $aWhere = ['p_article_id' => $iPArticleId,'state' => 0];
        $aAuthor = Db::name('production_article_author')->where($aWhere)->select();
        if(empty($aAuthor)){
            return ['status' => 3,'msg' => 'Author information is empty'];
        }
        //查询作者机构
        $aWhere['p_article_author_id'] = ['in',array_column($aAuthor, 'p_article_author_id')];
        $aAuthorOrgan = Db::name('production_article_author_to_organ')->field('p_article_author_id,p_article_organ_id')->where($aWhere)->select();
        //查询机构信息
        $aAuthorOrganList = [];
        if(!empty($aAuthorOrgan)){
            unset($aWhere['p_article_author_id']);
            $aOrganId = array_unique(array_column($aAuthorOrgan, 'p_article_organ_id'));
            $aWhere['p_article_organ_id'] = ['in',$aOrganId];
            $aOrgan = Db::name('production_article_organ')->where($aWhere)->column('p_article_organ_id,organ_name');
            if(!empty($aOrgan)) {
                foreach ($aAuthorOrgan as $key => $value) {
                    if(empty($aOrgan[$value['p_article_organ_id']])){
                        continue;
                    }
                    $aAuthorOrganList[$value['p_article_author_id']][] = $aOrgan[$value['p_article_organ_id']];
                }
            }
        }
        //处理作者
        $sAuthor = $sCorrespondence = '';
        foreach ($aAuthor as $key => $value) {
            //作者姓名
            $sName = empty($value['fifirst_name']) ? '' : $value['fifirst_name'];
            $sName = empty($sName) ? '' : $sName . ' ' .$value['last_name'];
            if(empty($sName)){
                $sName = empty($value['author_name']) ? '' : $value['author_name'];
            }
            if(empty($sName)){
                continue;
            }

            $sAuthor .= '\author{'.$this->dealContent($sName).'}'."\n";
            if(!empty($value['email']) && $value['is_report'] == 1){
                $sAuthor .= '\email{'.$this->dealContent($value['email']).'}'."\n";
            }
            //作者机构
            $aOrganList = empty($aAuthorOrganList[$value['p_article_author_id']]) ? [] : $aAuthorOrganList[$value['p_article_author_id']];
            if(!empty($aOrganList)){
                $i = 0;
                foreach($aOrganList as $organ){
                    if(empty($organ)){
                        continue;
                    }
                    if($i == 0){
                        $sAuthor .= '\affiliation{'.$this->dealContent($organ).'}'."\n";
                    }else{
                        $sAuthor .= '\alsoaffiliation{'.$this->dealContent($organ).'}'."\n";
                    }
                    $i++;
                }
            }
            if($value['is_first'] == 1){
                $sAuthor .= '\firstauthor'."\n";
            }
            if(!empty($value['orcid'])){
                $sAuthor .= '\orcid{'.$this->dealContent($value['orcid']).'}'."\n";
            }
            if($value['is_report'] == 1){
                $sCorrespondence .= $sName;
                if(!empty($aOrganList[0])){
                    $sCorrespondence .= ','.trim($this->dealContent($aOrganList[0]),'.');
                }
                if(!empty($value['email'])){
                    $sCorrespondence .= '.E-mail: '.trim($this->dealContent($value['email']),'.').'.';
                }
            }
        }
        return ['author' => $sAuthor,'correspondence' => $sCorrespondence];
    }

    /**
     * 生成初稿-获取期刊分期信息
     */
    private function getJournalStage($aParam = []){
        // 获取分期ID
        $aParam = empty($aParam) ? $this->request->post() : $aParam;
        //必填值验证
        $iJournalStageId = empty($aParam['journal_stage_id']) ? '' : $aParam['journal_stage_id'];
        if(empty($iJournalStageId)){
            return json_encode(array('status' => 2,'msg' => 'Please choose journal installment' ));
        }
        $sUrl = $this->sJournalUrl."api/Supplementary/getJournalStage";
        $aResult = object_to_array(json_decode(myPost1($sUrl,$aParam)));
        return $aResult;
    }
    /**
     * 处理文章引用
     * @param string $html
     * @return string
     */
    private function getArticleCite($aArticle = [],$aJournal = [],$aJournalStage = []){
        $no =  empty($aJournalStage['stage_no']) ? ':' : '(' . $aJournalStage['stage_no'] . '):';
        $jabbr = empty($aJournal['jabbr']) ? '' : $aJournal['jabbr'];
        $stage_year = empty($aJournalStage['stage_year']) ? '' : $aJournalStage['stage_year']; 
        $stage_vol = empty($aJournalStage['stage_vol']) ? '' : $aJournalStage['stage_vol'];

        $aAbbr = empty($aArticle['abbr']) ? '' : explode(',', trim($aArticle['abbr']));
        if(!empty($aAbbr)){
            $sEnd = end($aAbbr);
            if($sEnd != 'et al'){
                $aArticle['abbr'] = implode(',', array_slice($aAbbr, 0,3));
                if(!empty($aArticle['abbr'])){
                    $aArticle['abbr'] .= ', et al';
                }
            }
        }
        $sCite = '';
        if ($aArticle['journal_id'] == 22) {
            $sCite = $aArticle['abbr'] . '. ' . $aArticle['title'] . '[J]. ' . choiseJabbr($aArticle['article_id'],$jabbr) . ',' . $stage_year . ',' . $stage_vol . $no . $aArticle['npp'] . '. doi:' . $aArticle['doi'];
            $sCite = $this->dealContent($sCite);
        } else {
            $sCite = $this->dealContent($aArticle['abbr']) . '. ' . $this->dealContent($aArticle['title']) . '. \textit{' . $this->dealContent(choiseJabbr($aArticle['article_id'], $jabbr)) . '}. ' . $stage_year . ';' . $stage_vol . $no . $aArticle['npp'] . '. doi:' . $aArticle['doi'];
        }
        return $sCite;
    }

    private function getArticleTime($aParam = []){
        //必填值验证
        $iArticleId = empty($aParam['article_id']) ? '' : $aParam['article_id'];
        if(empty($iArticleId)){
            return array('status' => 2,'msg' => 'Please select an article' );
        }
        //查询文章
        $aWhere = ['article_id' => $iArticleId];
        $aArticle= Db::name('article')->field('ctime,received_time')->where($aWhere)->find();
        if(empty($aArticle)){
            return array('status' => 2,'msg' => 'The article does not exist' );
        }
        //获取文章记录
        $aWhere = ['article_id' => $iArticleId,'state' => 0,'state_to' => ['in',[0,1,5]]];
        $aArticleMsg = Db::name('article_msg')->field('state_from,state_to,ctime')->where($aWhere)->order('ctime deac')->select();
        $iReceivedTime = $iRevisionTime = $iAcceptedTime = 0;
        if(!empty($aArticleMsg)){
            foreach ($aArticleMsg as $key => $value) {
                if(empty($iReceivedTime) && $value['state_to'] == 0){
                    $iReceivedTime = $value['ctime'];
                }
                if(empty($iRevisionTime) && $value['state_to'] == 1){
                    $iRevisionTime = $value['ctime'];
                }
                if(empty($iAcceptedTime) && $value['state_to'] == 5){
                    $iAcceptedTime = $value['ctime'];
                }
            }
        }
        $iReceivedTime = empty($iReceivedTime) ? $aArticle['received_time'] : $iReceivedTime;
        $iReceivedTime = empty($iReceivedTime) ? $aArticle['ctime'] : $iReceivedTime;
        $aTime = [];
        $aTime['received_date'] = empty($iReceivedTime) ? '' : $this->timestampToEnglishDate($iReceivedTime); 
        $aTime['revision_date'] = empty($iRevisionTime) ? '' : $this->timestampToEnglishDate($iRevisionTime); 
        $aTime['accepted_date'] = empty($iAcceptedTime) ? '' : $this->timestampToEnglishDate($iAcceptedTime); 
        return ['status' => 1,'msg' => 'success','data' => $aTime];
    }
    /**
     * 时间戳转换为「d F Y」格式（如 12 June 2025）
     * @param int $timestamp 时间戳（如1749600000）
     * @return string 格式化后的英文日期
     */
    private function timestampToEnglishDate($timestamp) {
        //验证时间戳有效性
        if (!is_numeric($timestamp) || $timestamp < 0) {
            return '';
        }

        //设置本地化（确保月份为英文全称，兼容Linux/Windows）
        $locale = strtoupper(substr(PHP_OS, 0, 3)) === 'WIN' 
            ? 'English_United States.1252' 
            : 'en_US.UTF-8';
        setlocale(LC_TIME, $locale);

        //格式化：d=日（无前导零）、F=英文月份全称、Y=四位年 strftime的%e在Linux下是无前导零的日，Windows用%#d
        if (strtoupper(substr(PHP_OS, 0, 3)) === 'WIN') {
            $dateStr = strftime('%#d %B %Y', $timestamp); // Windows
        } else {
            $dateStr = strftime('%e %B %Y', $timestamp); // Linux/Mac
        }
        return trim($dateStr);
    }
    /**
     * 内容处理
     */
    private function dealContent($content = '', $target = 'latex',$iIsDeal = 1) {
        // 空值直接返回
        if (empty($content)) {
            return '';
        }

        //统一编码为UTF-8
        $content = mb_convert_encoding($content, 'UTF-8', mb_detect_encoding($content));
        //过滤不可见/非法字符
        $content = preg_replace('/[\x00-\x1F\x7F]/u', '', $content);
        //整合所有替换规则（按优先级排序：先处理HTML实体，再处理LaTeX特殊字符）
        $replaceRules = [
            // ========== HTML实体替换 ==========
            '&nbsp;'   => '~',        // HTML非断行空格 → LaTeX非断行空格
            '&nbsp'    => '~',        // 兼容无分号的&nbsp
            '&amp;'    => '\&',       // HTML& → LaTeX转义&
            '&lt;'     => '<',        // HTML< → 直接保留
            '&gt;'     => '>',        // HTML> → 直接保留
            // ========== LaTeX特殊字符转义 ==========
            '{'        => '\{',       // 左花括号转义
            '}'        => '\}',       // 右花括号转义
            '&'        => '\&',       // 原生&转义（需在&amp;之后，避免覆盖）
            '%'        => '\%',       // 百分号转义（LaTeX注释符）
            '_'        => '\_',       // 下划线转义（LaTeX下标符）
            'κ'        => '$\kappa$', // 希腊字母κ → LaTeX数学环境（避免乱码）
            '-'        => '\text{-}', // 短横线强制保留形态
            ':'        => ':',        // 冒号无需转义（占位，便于统一维护）
        ];

        //执行批量替换
        $content = strtr($content, $replaceRules);
        //清理多余空格/换行
        $content = preg_replace('/\s+/u', ' ', trim($content));
        return $content;
    }
    /**
     * @title curl 请求获取图片保存到本地
     * @param sPath 图片链接地址
     */
    private function getImage($sPath = '',$iId = 0){
        //判断参数
        if(empty($sPath) || empty($iId)){
            return ['status' => 2,'msg' => 'url is empty','data' => ''];
        }

        //获取图片名称
        $aImageInfo = pathinfo($sPath);

        //图片后缀名
        $sExtension = empty($aImageInfo['extension']) ? 'jpg' : $aImageInfo['extension'];

        //图片地址
        $sDir = ROOT_PATH.trim($this->sLatexUrl,'/').'/article_pdf/'.$iId.'/';
        $sImagePath = $sDir.basename($sPath);
        if (file_exists($sImagePath)) {
            return ['status' => 1,'msg' => 'success','data' => $sImagePath];
        }

        //下载图片
        if (!is_dir($sDir)) {
            mkdir($sDir, 0755, true);
        } 
        //curl 请求
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL,$sPath); // 设置请求URL
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true); // 设置返回数据而不是直接输出
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false); // 禁用SSL验证
        $response = curl_exec($ch);
        if (curl_errno($ch)) {
            return ['status' => 3,'msg' => 'Error:' . curl_error($ch),'data' => $sImagePath];
        }
        //保存图片
        file_put_contents($sImagePath, $response);
        curl_close($ch);
        return ['status' => 1,'msg' => 'success','data' => $sImagePath];

    }
    
}
?>