var http = require('http');
var url = require('url');
var fs = require('fs');
var express = require('express'); // Para HTTP
var cors = require('cors'); // Para HTTP com EXPRESS
var crypto = require('crypto');
var chance = require('chance');

var event = express();
event.use(cors());
var salts = new chance();
/*
 * var bodyParser = require('body-parser'); // Ler body do post
 * event.use(bodyParser.json()); event.use(bodyParser.urlencoded({ extended :
 * true }));
 */

function isInteger(x) {
    return x % 1 === 0;
}
check_file();

function check_file()
{
        fs.readFile('dados.json', function(err, data)
        {
            try
            {
                        JSON.parse(data.toString());
            }
            catch (e)
            {
                        fs.writeFile('dados.json', "[]", function(err){});
            }
        });
        fs.readFile('ranking.json', function(err, data)
                        {
                            try
                            {
                                        JSON.parse(data.toString());
                            }
                            catch (e)
                            {
                                        fs.writeFile('ranking.json', "[]", function(err){});
                            }
                        });
}

function sort_object(object){
        object.sort(function(a, b) {
                 if(a.victories==b.victories)
                        return parseInt(a.games) - parseInt(b.games);

                 return -(parseInt(a.victories) - parseInt(b.victories));

        });

}

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 (req, res){
    var preq = url.parse(req.url,true);
    console.log("entra");
    var pathname = preq.pathname;
    console.log(pathname);
    var answer = {};
    switch(req.method){
        case "POST":
            doPost(pathname,req,res);
            break;

    }
   // res.writeHead(200, headers.plain);
});

server.listen(8080);

function doPost(pathname, req, res){
    var body = "";
    var resposta;
    console.log("do post " + pathname);
    res.setHeader('Access-Control-Allow-Origin','*');
    switch(pathname) {
        case "/register":
        req
        .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");
                        console.log(body);
                        var dados = JSON.parse(body);
                        var user = dados.nick;
                        var pass = dados.pass;
                        console.log("user no register " + user + " pass " + 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');



                                    if(pass === object[i].pass){
                                    	console.log("etnra flag2");
                                                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);

                                });
                                res.writeHead(200, {'Content-Type' : 'text/plain'});
                                res.write("{}");

                            }
                            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();

                  }
                    else{
                        res.writeHead(404, {'Content-Type' : 'text/hml'});
                        res.write(JSON.stringify({error: "ERROR"}));
                    }
                    })}

        catch(err) { console.log("erro json"); /* erros de JSON */ }


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

        case "/ranking":
        	req
        		.on("data",function(data) {body +=data})
             .on("end",function(){
                    try{
        	console.log("create server ranking");
            var file = fs.readFile('ranking.json', function(err, data) {
                    if (!err) {
                    	console.log(body);
                        var dados = JSON.parse(body);

                            var size = dados.size;
                            console.log("size "  + size +isInteger(size));
                            if(isInteger(size) && (size>=2 && size<=10)){
                                    var object = JSON.parse(data.toString('utf8'));

                                    console.log("asd " +object);
                                    if(object[size] != undefined){
                                            sort_object(object);
                                            res.writeHead(200, {'Content-Type' : 'text/plain'});
                                            res.write(JSON.stringify(object[size]));
                                            console.log(object[size]);
                                    }
                                    else{
                                            res.writeHead(401, {'Content-Type' : 'text/hml'});
                                            res.write(JSON.stringify({error: "Doens't exits table with this size"}));
                                            console.log("nao tem tabela");
                                    }
                            }
                            else{
                                    res.writeHead(401, {'Content-Type' : 'text/hml'});
                                    res.write(JSON.stringify({error: "Size isn't a valid"}));
                                    console.log("deu erro com size not int");

                            }
                            res.end();
                    }
                    else{
                            res.writeHead(404, {'Content-Type' : 'text/html'});
                            res.end();
                            console.log("deu erro");

                    }
            });
 }
                    catch(err) { console.log("erro json"); /* erros de JSON */ }

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