const path = require('path')

const renderOpts = { textOnly: true, encodeEntities: true }

// This middleware exposes a list of all categories and child articles at /categories.json.

// GitHub Support uses this for internal ZenDesk search functionality.

module.exports = async function categoriesForSupport (req, res, next) {

const englishSiteTree = req.context.siteTree.en

const allCategories = []

await Promise.all(Object.keys(englishSiteTree).map(async (version) => {

await Promise.all(englishSiteTree[version].childPages.map(async (productPage) => {

if (productPage.page.relativePath.startsWith('early-access')) return

if (!productPage.childPages) return

await Promise.all(productPage.childPages.map(async (categoryPage) => {

// We can't get the rendered titles from middleware/render-tree-titles

// here because that middleware only runs on the current version, and this

// middleware processes all versions.

const name = categoryPage.page.title.includes('{')

? await categoryPage.page.renderProp('title', req.context, renderOpts)

: categoryPage.page.title

allCategories.push({

name,

published_articles: await findArticlesPerCategory(categoryPage, [], req.context)

})

}))

}))

}))

return res.json(allCategories)

}

async function findArticlesPerCategory (currentPage, articlesArray, context) {

if (currentPage.page.documentType === 'article') {

const title = currentPage.page.title.includes('{')

? await currentPage.page.renderProp('title', context, renderOpts)

: currentPage.page.title

articlesArray.push({

title,

slug: path.basename(currentPage.href)

})

}

if (!currentPage.childPages) return articlesArray

// Run recursively to find any articles deeper in the tree.

await Promise.all(currentPage.childPages.map(async (childPage) => {

await findArticlesPerCategory(childPage, articlesArray, context)

}))

return articlesArray

}