#!/usr/bin/env node

const { exercises } = require('../config.json');

const TAG_CORE = '__core';

const TAG_BONUS = '__bonus';

// node inter-opt exports

exports.TAG_CORE = TAG_CORE;

exports.TAG_BONUS = TAG_BONUS;

exports.tree = exercises.reduce((result, exercise) => {

const tag = exercise.slug;

const item = {

slug: tag,

difficulty: exercise.difficulty,

};

if (exercise.core) {

const current = result[TAG_CORE] || [];

if (result[tag]) {

console.warn(`${tag} is not ordered correctly in config.json`);

}

return {

...result,

__core: current.concat([item]),

[tag]: result[tag] || [],

};

}

const parent = exercise.unlocked_by || TAG_BONUS;

const current = result[parent] || [];

return { ...result, [parent]: current.concat([item]) };

}, {});