const ejs = require("ejs");
const fs = require("fs");
const mkdirp = require("mkdirp");
const path = require("path");

function saveArticle(article) {
  return new Promise((resolve, reject) => {
    fs.readFile("templates/article.ejs", (err, articleTemplate) => {
      if (err) { return reject(err); }

      fs.readFile("templates/layout.ejs", (err, layoutTemplate) => {
        if (err) { return reject(err); }

        const articleBodyHTML = ejs.render(articleTemplate.toString(), article);
        const articleHTML = ejs.render(layoutTemplate.toString(), {
          title: article.title + " | Fuwn",
          body: articleBodyHTML,
          description: article.description || article.summary,
        });

        const articlePath = path.join("output", article.route);

        mkdirp(articlePath, err => {
          if (err) { return reject(err); }

          fs.writeFile(
            path.join(articlePath, "index.html"),
            articleHTML,
            err => {
              if (err) { return reject(err); }
              resolve("ok");
            }
          );
        });
      });
    });
  });
}

module.exports = saveArticle;