'use strict';

const Promise = require("bluebird");
const fs = Promise.promisifyAll(require("fs"));
const path = require("path");
const naturalSort = require("natural-sort");

function statComplete(target) {
	return Promise.try(() => {
		return Promise.try(() => {
			return fs.lstatAsync(target);
		}).then((stats) => {
			if (stats.isSymbolicLink()) {
				return Promise.try(() => {
					return fs.statAsync(target);
				}).then((targetStats) => {
					return {
						stats: targetStats,
						linkStats: stats
					}
				});
			} else {
				return {
					stats: stats
				}
			}
		});
	})
}

function getType(stats) {
	if (stats.isSymbolicLink()) {
		return "link";
	} else if (stats.isDirectory()) {
		return "folder";
	} else if (stats.isFile()) {
		return "file";
	} else {
		return "other";
	}
}

module.exports = function(basePath) {
	return Promise.try(() => {
		return fs.readdirAsync(basePath);
	}).map((entry) => {
		let fullPath = path.join(basePath, entry);

		return Promise.try(() => {
			return statComplete(fullPath);
		}).then((stats) => {
			let type, targetType;

			if (stats.linkStats != null) {
				type = "link";
				targetType = getType(stats.stats);
			} else {
				type = getType(stats.stats);
				targetType = type;
			}

			return {
				type: type,
				targetType: targetType,
				name: entry,
				path: fullPath,
				modified: stats.stats.mtime,
				size: stats.stats.size
			}
		})
	}).then((entries) => {
		let sorter = naturalSort();

		return entries.sort((entryA, entryB) => {
			if (entryA.targetType == "folder" && entryB.targetType != "folder") {
				return -1;
			} else if (entryB.targetType == "folder" && entryA.targetType != "folder") {
				return 1;
			} else {
				return sorter(entryA.name, entryB.name);
			}
		});
	});
}