const pug = require("pug");
const showdown = require("showdown");
const h = require("hyperscript");

class Markdown {
  constructor() {
    this.converter = new showdown.Converter({
      parseImgDimensions: true
    });
    this.converter.setFlavor("github");
    this.converter.addExtension({
      type: "lang",
      filter(text) {
        const rowRegex = /(?:(?:^|\r?\n)(?:\| )?(?:(?:.* \| )+.+)*(?:.* \| )+.+(?: \|)?(?:$|\r?\n))+/m;

        text = text.replace(rowRegex, (p0) => {
          return h("table.table", p0.trim().split("\n").map((pi) => {
            pi = pi.trim().replace(/^|/, "").replace(/|$/, "")

            return h("tr", pi.split(" | ").map((x) => x.trim()).map((qi) => {
              return h("td", qi);
            }))
          })).outerHTML;
        });

        return text;
      }
    })
  }

  md2html(md) {
    return this.converter.makeHtml(md);
  }
}

const md = new Markdown();

module.exports = {
  Markdown,
  apply() {
    cogear.on("preload.page.parse", (page) => {
      if (page.format === ".pug") {
        page.__content = pug.compile(page.__content || "", {
          filters: {
            markdown: (text) => {
              return md.md2html(text)
            }
          }
        })()
        page.format = ".html";
      } else if (page.format === ".md") {
        page.__content = md.md2html(page.__content || "")
        page.format = ".html";
      }
    })
  }
}