var express     = require('express');
var app         = express();
var fs          = require('fs');

app.listen(3000, function() {
    console.log("[NodeJS] Application Listening on Port 3000");
});

app.get('/api/play/:key', function(req, res) {
    var key = req.params.key;

    var music = 'music/' + key + '.mp3';

    var stat = fs.statSync(music);
    range = req.headers.range;

    console.log(req.headers);
    var parts = range.replace(/bytes=/, "").split("-");

    var partial_start = parts[0];
    var partial_end = parts[1];

    var start = parseInt(partial_start, 10);
    var end = partial_end ? parseInt(partial_end, 10) : stat.size-1;
    var content_length = (end-start)+1;

    res.status(206).header({
        'Content-Type': 'audio/mpeg',
        'Content-Length': content_length,
        'Content-Range': "bytes " + start + "-" + end + "/" + stat.size
    });

    var readStream = fs.createReadStream(music, {start: start, end: end});
    readStream.pipe(res);
});