var Q = require("q");
var events = require("events");
var http = require("http");
var send = require("send");
var util = require("util");
var url = require("url");

var Server = function() {
    this.running = null;
    this.dir = null;
    this.port = 0;
    this.sockets = [];
};
util.inherits(Server, events.EventEmitter);

// Return true if the server is running
Server.prototype.isRunning = function() {
    return !!this.running;
};

// Stop the server
Server.prototype.stop = function() {
    var that = this;
    if (!this.isRunning()) return Q();

    var d = Q.defer();
    this.running.close(function(err) {
        that.running = null;
        that.emit("state", false);

        if (err) d.reject(err);
        else d.resolve();
    });

    for (var i = 0; i < this.sockets.length; i++) {
        this.sockets[i].destroy();
    }

    return d.promise;
};

Server.prototype.start = function(dir, port) {
    var that = this, pre = Q();
    port = port || 8004;

    if (that.isRunning()) pre = this.stop();
    return pre
    .then(function() {
        var d = Q.defer();

        that.running = http.createServer(function(req, res){
            // Render error
            function error(err) {
                res.statusCode = err.status || 500;
                res.end(err.message);
            }

            // Redirect to directory"s index.html
            function redirect() {
                res.statusCode = 301;
                res.setHeader("Location", req.url + "/");
                res.end("Redirecting to " + req.url + "/");
            }

            // Send file
            send(req, url.parse(req.url).pathname)
            .root(dir)
            .on("error", error)
            .on("directory", redirect)
            .pipe(res);
        });

        that.running.on("connection", function (socket) {
            that.sockets.push(socket);
            socket.setTimeout(4000);
            socket.on("close", function () {
                that.sockets.splice(that.sockets.indexOf(socket), 1);
            });
        });

        that.running.listen(port, function(err) {
            if (err) return d.reject(err);

            that.port = port;
            that.dir = dir;
            that.emit("state", true);
            d.resolve();
        });

        return d.promise;
    });
};

module.exports = Server;