var http = require('http');
var url = require('url');
var fs = require("fs");
var crypto = require('crypto');

var headers = {
    plain: {
        'Content-Type': 'application/javascript',
        'Cache-Control': 'no-cache',
        'Access-Control-Allow-Origin': '*'
    },
    sse: {
        'Content-Type': 'text/event-stream',
        'Cache-Control': 'no-cache',
        'Access-Control-Allow-Origin': '*',
        'Connection': 'keep-alive'
    }
};


var server = http.createServer(function (request, response){
    var preq = url.parse(request.url,true);
    console.log("entra");
    var pathname = preq.pathname;
    console.log(pathname);
    var answer = {};
    switch(request.method){
        case "POST":
            doPost(pathname,request,response);
        default:
    }
    //response.writeHead(200, headers["plain"]);
});

server.listen(8080);

function doPost(pathname, req, res){
    var body = "";
    var resposta;
    console.log("do post " + pathname);
    response.setHeader('Access-Control-Allow-Origin','*');
    switch(pathname) {
        case "/register":
        request
        .on("data",function(data) {body +=data})
        .on("end",function(){
            try{
                var data = "";

                console.log("createServer");
                var file = fs.readFile('dados.json', function(err, data) {

                    if (!err) {
                        console.log("entrou no if");
                        //var dados = JSON.parse(data.toString());
                        var user = req.body.nick;
                        var pass = req.body.pass;
                        var flag = 1;
                        var object = JSON.parse(data.toString('utf8'));

                        for(var i=0;i<object.length;i++){
                            var object_teste = JSON.stringify(object);
                            console.log("for2 user " + object_teste);
                                //console.log("for2 pass " + object_teste.body.pass[i]);
                                if(object[i].nick === user){
                                    console.log("This user already exits");
                                    var password = crypto.createHash('md5').update(object[i].salt + pass).digest('hex');

                                    console.log("password " + password);
                                    console.log("pass " + pass);

                                    if(password === object[i].pass){
                                                flag=2; //200
                                                console.log("falg " + flag);

                                                break;
                                            }
                                            else {
                                         flag=3; //401
                                         console.log("falg " + flag);

                                         break;
                                     }

                                 }
                                 else{
                                    flag=1;

                                }
                            }
                                console.log("falg final " + flag);

                                if(flag==1){
                                    var salt = salts.string({length: 4}  );
                                    var password = crypto.createHash('md5').update(salt + pass).digest('hex');
                                //console.log(" data " + object[0]);
                                var savefile = {};
                                savefile.nick=user;
                                savefile.pass=password;
                                savefile.salt=salt;
                                //console.log(" body " + JSON.stringify(req.body));
                                console.log("pass " + pass);
                                console.log("pass cri " + password);
                                object.push(savefile);
                                //console.log("aqui " + object);

                                fs.writeFile('dados.json', JSON.stringify(object), function(err) {
                                    if (err)
                                        return console.log(err);

                                });
                            }
                            else if(flag==2){
                                res.writeHead(200, {'Content-Type' : 'text/plain'});
                                res.write("{}");
                                console.log("flag2" + flag);

                            }
                            else{
                                res.writeHead(401, {'Content-Type' : 'text/hml'});
                                res.write(JSON.stringify({error: "User registered with a different password"}));
                                console.log("flag3" + flag);

                            }
                            //res.end();

                  }})}

        catch(err) {  /* erros de JSON */ }


    })
        .on("error", function(err) { console.log(err.message); })
        break;

        return;

    }
}