"use strict";

const lastItem = require("last-item");
const createNamedTreeBuilder = require("./named-tree-builder");

const specialUseAttributes = new Set([
	'\\All',
	'\\Archive',
	'\\Drafts',
	'\\Flagged',
	'\\Important',
	'\\Junk',
	'\\Sent',
	'\\Trash'
]);

// TODO: Eventually make this progressively updateable so that the results of multiple LIST commands can be combined over time?

module.exports = function createBoxTreeBuilder() {
	let treeBuilder = createNamedTreeBuilder({
		childrenKey: "children",
		parentKey: "parent",
		treatRootAsParent: false
	});

	return {
		add: function (item) {
			let { flags, delimiter } = item;

			let path = (delimiter != null)
				? item.name.split(delimiter)
				: [ item.name ];

			treeBuilder.add(path, {
				name: lastItem(path),
				path: path,
				attributes: flags,
				delimiter: delimiter,
				specialUseAttribute: flags.find((attribute) => specialUseAttributes.has(attribute)),
				children: null,
				parent: null
			});
		},
		done: function () {
			return treeBuilder.done().children;
		}
	};
};