const { iterateEdges, mapToNavigationData } = require('./createPageUtils');

function getYamlPageIdentifier(relativePath) {

// Include optional possible language code file extension suffixes

// eg.: index.en.md, index.md, index.en.mdx, some-blog-post.md, ...

return relativePath.includes('/index.')

? relativePath.replace(/\/index(\.[a-z]+)?\.(mdx|md)/, '')

: relativePath.replace(/(\.[a-z]+)?\.(mdx|md)/, '');

}

function createMarkdownPages(pagesEdges, learnEdges, yamlNavigationData) {

const learnPages = [];

const navigationData = {};

// Iterates the non-Learn edges and transforms them in Pages

const markdownPages = iterateEdges(pagesEdges);

const getLearnEdgeByPageId = pageId => edge =>

getYamlPageIdentifier(edge.node.parent.relativePath) === pageId;

// Handles the Navigation Data only of Learn pages

yamlNavigationData.forEach(({ section, items }) => {

navigationData[section] = {

category: 'learn',

data: [],

};

// This adds the items to the navigation section data based on the order defined within the YAML file

// If the page doesn't exist it will be set as null and then removed via Array.filter()

const iteratedPages = iterateEdges(

items

// Iterates the items of the section and retrieve their respective edges

// then we transform them into pages and add to the navigation data

.map(pageId => learnEdges.find(getLearnEdgeByPageId(pageId)))

.filter(edge => edge && edge.node)

);

navigationData[section].data = iteratedPages.map(mapToNavigationData);

// Then we push them to the resulting learn pages object

learnPages.push(...iteratedPages);

});

return {

markdownPages,

learnPages,

navigationData,

firstLearnPage: learnPages[0],

};

}

module.exports = createMarkdownPages;