const {
    JSDOM
} = require("jsdom");
const fs = require("fs");
const converter = require("./showdown")(2);

module.exports = function () {
    let folder = __dirname + "/../";
    createBlogPages(folder);

    fs.watchFile(folder + "blog/posts.json", function (curr, prev) {
        if (curr.mtime == prev.mtime)
            return;
        createBlogPages(folder);
    });
}

function createBlogPages(folder) {
    console.log("Refreshing blog sub-sites...");

    fs.readFile(folder + "index.html", function (_, data) {
        // set up the template
        let templateDom = new JSDOM(data);
        var templateDoc = templateDom.window.document;
        templateDoc.getElementById("main").innerHTML = "";
        let template = templateDom.serialize();

        fs.readFile(folder + "blog/posts.json", function (_, data) {
            let json = JSON.parse(data);
            for (let i = 0; i < json.length; i++) {
                let post = json[i];
                fs.readFile(folder + "blog/" + post.id + ".md", function (_, content) {
                    let dom = new JSDOM(template);
                    var document = dom.window.document;

                    document.title += " - " + post.name;
                    document.querySelector('meta[property="og:title"]').setAttribute("content", post.name);
                    document.querySelector('meta[name="description"]').setAttribute("content", post.summary);
                    document.querySelector('meta[property="og:description"]').setAttribute("content", post.summary);

                    var nav = "";
                    nav += '<a class="nav-item nav-link" href="/#blog">Back to Main Page</a>';
                    if (i > 0)
                        nav += '<a class="nav-item nav-link" href="/blog-' + json[i - 1].id + '">Previous Post</a>';
                    if (i < json.length - 1)
                        nav += '<a class="nav-item nav-link" href="/blog-' + json[i + 1].id + '">Next Post</a>';
                    document.getElementById("nav-items").innerHTML = nav;

                    var c = "";
                    c += '<div class="list-display rounded">';
                    c += '<div class="blog-isolated">'
                    c += '<h1>' + post.name + '</h1>';
                    c += '<div id="blog-post-' + post.id + '">'
                    c += converter.makeHtml(content.toString());
                    c += '</div>';
                    c += '<span class="text-muted project-status blog-isolated-status">' + post.date + "</span>";
                    var discussLink = post.discuss;
                    if (discussLink)
                        c += '<a href="' + discussLink + '" class="blog-discuss" id="blog-discuss-' + post.id + '">Discuss this post</a>'
                    c += '</div></div>';
                    document.getElementById("main").innerHTML = c;

                    let html = dom.serialize();
                    fs.writeFile(folder + "blog-" + post.id + ".html", html, function (_, _) {});
                });
            }
        });
    });
}