var mongo = require("mongodb").MongoClient;
var mongoErr = false;
var ips = [];
var app = require("express")();
app.get("/register", function(req, res){
    res.sendFile(__dirname + "/register.html");
});
var bodyParser = require('body-parser');
app.use(bodyParser.urlencoded({extended: false}));
app.use(bodyParser.json());
app.post("/register", function(req, res){
    if (req.body.nickname && req.body.password && req.body.confpassword && req.body.avatarurl && (ips.indexOf(req.connection.remoteAddress) == -1)) {
        if ((req.body.nickname.length > 3) && (req.body.nickname.length < 16)) {
            if ((req.body.password.length > 4) && (req.body.password.length < 86)) {
                if (req.body.confpassword == req.body.password) {
                    if (req.body.avatarurl.slice(0, 7) == "http://") {
                        if (!mongoErr) {
                            function genTok(len, symbols) {
                                if (len != 0) {
                                    return symbols[Math.round(Math.random() * symbols.length - 1)] + genTok(len - 1, symbols);
                                } else {
                                    return "";
                                }
                            }
                            mongo.connect("mongodb://localhost:27017/bechat", function(err, db){
                                if (!err) {
                                    db.collection("users").insertOne({
                                    nickname: req.body.nickname,
                                    password: req.body.password,
                                    avatarurl: req.body.avatarurl,
                                    token: genTok(50, "qwertyuiopasdfghjklzxcvbnm1234567890")
                                });
                                ips.push(req.connection.remoteAddress);
                                res.redirect("/register#success");
                                } else {
                                    res.redirect("/register#fail");
                                }
                            });
                        }
                    }
                }
            }
        }
    } else {
        res.redirect("/register#fail");
    }
});
app.get("/style.css", function(req, res){
    res.sendFile(__dirname + "/style.css");
});
app.listen(3030);