import fs from "fs";

const base = "https://grammar.lingdocs.com";

console.log("generating sitemap.xml");

const indexText = fs.readFileSync("./src/content/index.ts", "utf-8");
const contentTreeRaw = indexText.split("/* content-tree */")[1];
const safeContentTreeText = contentTreeRaw
    .split("\n")
    .filter(l => !l.includes(`"import":`))
    .join("\n");
const contentTree = JSON.parse(safeContentTreeText);

const urls = contentTree.reduce((acc, section) => {
    if ("slug" in section) {
        return [
            ...acc,
            `${base}/${section.slug}`,
        ];
    } else {
        return [
            ...acc,
            ...section.chapters.map(x => `${base}/${section.subdirectory}/${x.slug}`),
        ];
    }
}, [base]);

const siteMap = `<?xml version="1.0" encoding="UTF-8"?>
<urlset xmlns="http://www.sitemaps.org/schemas/sitemap/0.9">
${urls.map(u => `   <url>
        <loc>${u}</loc>
    </url>    
`).join("")}
</urlset>
`

fs.writeFileSync("./public/sitemap.xml", siteMap);