import fs from 'fs'
import njk from 'nunjucks'
import { JSDOM } from 'jsdom'
import { parseExternalContext } from './externalContext.js'

// 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, externalContext = undefined) {
    const dom = new JSDOM(renderedNjk)

    return {
        serverName: Config.serverName,
        tocLinks: generateToc(dom),
        externalMeta: externalContext ? parseExternalContext(externalContext) : undefined
    }
}

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

    const context = generateContext(renderedNjk)

    return njk.renderString(njkFile, context)
}

export function mdRenderer(path) {
    // Load in the njk template and markdown
    const njkFile = fs.readFileSync(`${Config.contentDir}/templates/external_md.njk`).toString()
    const externalMarkdownFile = fs.readFileSync(path).toString()

    // Separate the actual markdown from potential 'externalContext'
    const externalMarkdown = externalMarkdownFile.replace(/^%%-\n[\S\s]*-%%\n/, "")
    const externalContext = externalMarkdownFile.match(/^%%-\n[\S\s]*-%%\n/)[0]

    const renderedNjk = njk.renderString(njkFile, { externalMarkdown })

    let context = generateContext(renderedNjk, externalContext)
    context.externalMarkdown = externalMarkdown

    return njk.renderString(njkFile, context)
}