var fs = require("fs");
var path = require("path");
var mm = require("musicmetadata");

var express = require("express");

var tracks = {};
var art = {};

var music = {
	artists: {}
};

var promise = new Promise(function (resolve, reject) {
	fs.readdir(path.join(__dirname, "music"), function (err, files) {
		var promises = [];
		files.forEach(function (artist) {
			art.artists[artist] = {
				albums: {},
				picture: []
			};
			music.artists[artist] = {
				albums: {}
			};
			var promise = new Promise(function (resolve, reject) {
				fs.readdir(path.join(__dirname, "music", artist), function (err, files) {
					var promises = [];
					files.forEach(function (album) {
						art.artists[artist].albums[album] = {
							tracks: [],
							picture: []
						};
						music.artists[artist].albums[album] = {
							tracks: []
						};
						var promise = new Promise(function (resolve, reject) {
							fs.readdir(path.join(__dirname, "music", artist, album), function (err, files) {
								var promises = [];
								files.forEach(function (title) {
									var fn = path.join(__dirname, "music", artist, album, title);
									var promise = new Promise(function (resolve, reject) {
										fs.stat(fn, function (err, stat) {
											if (stat.isFile()) {
												if (fn.match(/(.mp3|.wav)/) && fn.charAt(0) != ".") {
													mm(fs.createReadStream(fn), function (err, metadata) {
														if (err) {
															console.log(err);
															resolve();
														}
														else {
															var number = parseInt(title.split(" ")[0], 10);
															if (isNaN(number)) {
																number = music.artists[artist].albums[album].tracks.length;
															}
															
															// Art
															/*art.artists[artist].albums[album].tracks[number - 1] = {
																picture: []
															};
															art.artists[artist].albums[album].tracks[number - 1].picture = metadata.picture;
															if (!art.artists[artist].albums[album].picture[0] && metadata.picture[0]) {
																art.artists[artist].albums[album].picture = metadata.picture;
															}
															if (!art.artists[artist].picture[0] && metadata.picture[0]) {
																art.artists[artist].picture = metadata.picture;
															}*/

															var sha = crypto.createHash("sha1");
															fs.createReadStream(fn).pipe(sha).on("end", function () {
																
																metadata.number = number;
																metadata.file = "/tracks/" + sha.read();
																
																tracks[sha.read()] = new Buffer();
																fs.createReadStream(fn).pipe(tracks[sha.read()]);

																music.artists[artist].albums[album].tracks[number - 1] = metadata;

																resolve();
															});
														}
													});
												}
												else if (fn.match(/(.jpg|.png)/)) {
													fs.readFile(fn, function (err, data) {
														if (!err) {
															var fns = fn.split(".");
															art.artists[artist].albums[album].picture = [{
																format:	fns[fns.length - 1],
																data: data
															}];
															art.artists[artist].picture = art.artists[artist].albums[album].picture;
														}
														resolve();
													});
												}
												else {
													resolve();
												}
											}
											else {
												resolve();
											}
										});
									});
									promises.push(promise);
								});
								Promise.all(promises).then(function () {
									music.artists[artist].albums[album].tracks.forEach(function (track, i) {
										if ((!art.artists[artist].albums[album].tracks[i].picture[0]) && art.artists[artist].albums[album].picture[0]) {
											art.artists[artist].albums[album].tracks[i].picture = art.artists[artist].albums[album].picture;
										}
									});
									if (music.artists[artist].albums[album].tracks.length < 1) {
										music.artists[artist].albums[album] = undefined;
									}
									resolve();
								});
							});
						});
						promises.push(promise);
					});
					Promise.all(promises).then(resolve);
				});
			});
			promises.push(promise);
		});
		Promise.all(promises).then(resolve);
	});
});
promise.then(function () {
	console.log("done");
	for (var artist in music.artists) {
		for (var album in music.artists[artist].albums) {
			for (var track in music.artists[artist].albums[album].tracks) {
			}
			//music.artists[artist].albums[album].picture = ""
		}
	}
});

var app = express();

app.get("/", function (req, res) {
	res.end(JSON.stringify(music));
});