var fs = require('fs');
var path = require('path');

var express = require('express');
var router = express.Router();
var async = require('async');

var User = require('../models/User.js');
var Invite = require('../models/Invite.js');

var passport = require('passport');

var striptags = require('striptags');

function checkUsername(username, callback) {
    if (username.length > 30) return callback(null, false);
    if (striptags(username) !== username) return callback(null, false);

    User.find({username: username}).limit(1).count(function (err, count) {
        if (err) return callback(err);
        (count === 0) ? callback(null, true) : callback(null, false);
    });
}

function checkInvite(code, callback) {
    Invite.findOne({code: code}, function (err, invite) {
        if (err) return callback(err);
        if (!invite || invite.used || invite.exp < new Date())
            callback(null, false);
        else
            callback(null, true, invite);
    });
}

function useInvite(code, username) {
    Invite.updateOne({code: code}, {recipient: username, used: new Date()}, function (err, res) {
        if (err) throw err;
    });
}

router.post('/register', function (req, res) {
    // Validate the parameters
    async.parallel({
        userCheck: function (callback) {
            checkUsername(req.body.username, function (err, valid) {
                callback(err, valid);
            });
        },
        inviteCheck: function (callback) {
            checkInvite(req.body.invite, function (err, valid, invite) {
                callback(err, {valid: valid, invite: invite});
            });
        }
    }, function (err, result) {
        if (!result.userCheck) {
            res.status(401).json({'message': 'Invalid username.'});
        } else if (!result.inviteCheck.valid) {
            res.status(401).json({'message': 'Invalid invite code.'});
        } else {
            useInvite(req.body.invite, req.body.username);
            var user = new User();
            user.username = req.body.username;
            user.scope = result.inviteCheck.invite.scope;
            user.date = new Date();
            user.setPassword(req.body.password);

            user.save(function (err) {
                if (err) {
                    res.status(500).json({'message': 'Internal server error.'});
                } else {
                    res.status(200)
                        .cookie('shimapan-token', user.genJwt(), {
                            expires: new Date(Date.now() + 604800000),
                            httpOnly: true
                        })
                        .json({'token': user.genJwt()});
                }
            });
        }
    });
});

router.post('/login', function (req, res) {
    passport.authenticate('local', function (err, user, info) {
        if (err) {
            res.status(500).json(err);
        } else if (user) {
            res.status(200)
                .cookie('shimapan-token', user.genJwt(), {
                    expires: new Date(Date.now() + 604800000),
                    httpOnly: true
                })
                .json({'token': user.genJwt()});
        } else {
            res.status(401).json(info);
        }

    })(req, res);
});

router.get('/logout', function(req, res) {
    res.clearCookie('shimapan-token');
    res.status(200).json({'message': 'Successfully logged out.'});
});


module.exports = router;