import fs from 'fs'
import njk from 'nunjucks'
import { JSDOM } from 'jsdom'

// Load in config
const ConfigFile = fs.readFileSync('./config.json')
const Config = JSON.parse(ConfigFile)

function generateToc(dom) {
    const tocAnchors = dom.window.document.querySelectorAll(".toc-anchor")
    let tocLinks = []

    // This basically creates a proper link for the ToC. :)))
    tocAnchors.forEach(anchor => tocLinks.push(`<a href="#${anchor.name}" class="${anchor.classList[1].replace("-anchor", "")}">${anchor.getAttribute('data-orig-text')}</a>`))

    return tocLinks
}

function generateContext(renderedNjk) {
    const dom = new JSDOM(renderedNjk)

    return {
        serverName: Config.serverName,
        tocLinks: generateToc(dom)
    }
}

export function njkRenderer(path) {
    const njkFile = fs.readFileSync(path).toString()
    const renderedNjk = njk.renderString(njkFile)

    const context = generateContext(renderedNjk)

    return njk.renderString(njkFile, context)
}