let hljs;
hljs = require('../highlight/index');

const config = require('../../config'),
    mdOption = (()=>{
        let result = {
            html: true,
            xhtmlOut: true,
            typographer: true,
            breaks: true,
        };

        if(config.highlight.length && hljs){
            result.highlight = (code,lang,callback)=>{
                let lineLen = code.split(/\r|\n/ig).length,
                    result = hljs.highlightAuto(code).value;

                    // 代码块多换行的问题
                    result = result.replace(/(\r|\n){2,}/g, str => {
                        return new Array(str.length).join("<p>&nbsp;</p>")
                    });
                    result = result.replace(/\r|\n/g, str => {
                        return "<br/>"
                    });

                    // 代码空格处理
                    result = result.replace(/>[^<]+</g,str => {
                        return str.replace(/\s/g,"&nbsp;");
                    }).replace(/\t/g,new Array(4).join("&nbsp;"));

                if(config.showLineNumber){
                    let lineStr = (()=>{
                        let str = `<ul class="h2w__lineNum">`;
                        for(let i=0;i<lineLen-1;i++){
                            str += `<li class="h2w__lineNumLine">${i+1}</li>`
                        };

                        str += `</ul>`;
                        return str;
                    })();
                    return lineStr + result;
                };
                return result;
            }
        };
        return result;
    })(),
    md = require('./markdown')(mdOption);

// 应用Markdown解析扩展，包括自定义组件（['sub','sup','ins','mark','emoji','todo','latex','yuml','echarts']）
// [...config.markdown,...config.components].forEach(item => {
//     if(!/^audio-player|table|todogroup|img$/.test(item)){
//         md.use(require(`./plugins/${item}`));
//     };
// });
md.use(require('./plugins/sub'));md.use(require('./plugins/sup'));md.use(require('./plugins/ins'));md.use(require('./plugins/latex'));

// 定义emoji渲染规则
md.renderer.rules.emoji = (token,index)=>{
    let item = token[index];
    return `<g-emoji class="h2w__emoji h2w__emoji--${item.markup}">${item.content}</g-emoji>`;
};

// 导出模块
module.exports = str => {
    return md.render(str);
};