import { getAllPosts } from "../external/cms"
import fs from "fs"
import prettier from "prettier"
import config from './config'
import path from "path"


export const generateSitemap = async () => {
    const getDate = new Date().toISOString()

    const staticPaths = fs.readdirSync("pages", {withFileTypes: true})
        .filter((staticPage) => {
            if(staticPage.isFile()) {
        return ![ 
            "api",
            "_app.js",
            "_document.js",
            "404.js",
            "sitemap.xml.js",
            "index.js"
        ].includes(staticPage.name);
    }
        })
        .map((staticPagePath) => {
            return `${config.siteURL}/${path.parse(staticPagePath.name).name}`;
        }
    );

    const postData = await getAllPosts()
    const postList = []
    postData.data.forEach(post => postList.push({slug: post.attributes.Slug, updatedAt: post.attributes.updatedAt}))

    const formatted = sitemap => prettier.format(sitemap, { parser: "html" });

    const pageListMap = staticPaths.map(page => {
        return `
            <url>
                <loc>${page}</loc>
                <lastmod>${getDate}</lastmod>
                <priority>1</priority>
            </url>`
    }).join("")

    const postListSiteMap = postList.map(post => {
        return `
<url>
<loc>${`${config.siteURL}/news/${post.slug}`}</loc>
<lastmod>${post.updatedAt}</lastmod>
<priority>0.5</priority>
</url>`
    })
    .join("")

    const generatedSitemap = `<?xml version="1.0" encoding="UTF-8"?>
<urlset
xmlns="http://www.sitemaps.org/schemas/sitemap/0.9"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://www.sitemaps.org/schemas/sitemap/0.9 http://www.sitemaps.org/schemas/sitemap/0.9/sitemap.xsd"
>${pageListMap}${postListSiteMap}
</urlset>
    `
    const formattedSitemap = [formatted(generatedSitemap)];

    fs.writeFileSync("public/sitemap.xml", generatedSitemap, "utf8")
}