const path = require('path');

const fs = require('node:fs');

const matchAll = require('string.prototype.matchall');

const {

getMarkdownFiles,

replaceLinksInFile,

getFindPatternForMarkdownFiles: getFindPattern,

getReplacePatternForMarkdownFiles: getReplacePattern,

} = require('./scriptUtils.js');

function normalizeLinksInMarkdownFile(file, files) {

const relativeToDir = path.dirname(file);

const relativeFiles = files.map(file => path.relative(relativeToDir, file));

const linkMap = new Map();

const linkPattern = getFindPattern('[^)#]*');

let data = fs.readFileSync(file, 'utf8');

const links = matchAll(data, new RegExp(linkPattern, "gm"));

[...links].forEach(link => {

const optionalPrefix = link[2] ?? '';

const from = link[3] ?? '';

let to = from;

// ensure link includes file name and extension

if(to.endsWith('/') || optionalPrefix.endsWith('/') && !to) {

to = `${to}index.md`

}

if(!to.endsWith('.md') && to) {

to = `${to}.md`;

}

to = to.replaceAll('/', path.sep);

// ensure simplest relative path

// this removes trailing slash, so need to do this after the file name and extension checks above

const absolute = path.resolve(relativeToDir, to);

const relative = path.relative(relativeToDir, absolute);

to = relative;

// ensure the link we constructed above exists

const toExists = relativeFiles.find(file => to === file);

to = to.replaceAll(path.sep, '/');

if(to !== from && toExists) {

linkMap.set(from, to);

}

})

replaceLinksInFile({

file,

linkMap,

getFindPattern,

getReplacePattern,

});

}

try {

const files = getMarkdownFiles();

files.forEach(file => {

normalizeLinksInMarkdownFile(file, files);

});

} catch (err) {

console.error(err);

}