const {
    createSitemap
} = require('sitemap');
const fs = require("fs");

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

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

function refreshSitemap(folder) {
    console.log("Refreshing sitemap...");

    let sitemap = createSitemap({
        hostname: 'https://ellpeck.de',
        urls: [{
                url: '/',
                priority: 0.8
            },
            {
                url: '/#projects',
                changefreq: 'monthly'
            },
            {
                url: '/#social',
                changefreq: 'yearly'
            },
            {
                url: '/#about',
                changefreq: 'monthly'
            },
            {
                url: '/#blog',
                changefreq: 'weekly',
                priority: 0.6
            },
            {
                url: '/foefrenzy',
                priority: 0.7
            },
            {
                url: '/foefrenzy/maps'
            }
        ]
    });

    fs.readFile(folder + "blog/posts.json", function (_, data) {
        let json = JSON.parse(data);

        for (let post of json) {
            sitemap.add({
                url: "/blog-" + post.id
            });
        }

        fs.writeFile(folder + "/sitemap.xml", sitemap.toXML(), function (_, _) {});
    });
}