var mongoose = require("mongoose");
var express = require("express");
var passport = require('passport');

var httpStatus = require("../lib/httpStatusCodes");

var DEFAULT_SKIP = 0;
var DEFAULT_LIMIT = 20;

/**
    GET /users/
*/
function getAll(req, res) {
    var User = mongoose.model('User');

    User.find({})
        .skip(req.query.skip || DEFAULT_SKIP)
        .limit(req.query.limit || DEFAULT_LIMIT)
        .exec(function (err, users) {
            if (err) {
                res.json(httpStatus.INTERNAL_SERVER_ERROR, { 'error': err });
                return;
            }

            var us = users.map(function (x) {
                return {
                    _id: x._id,
                    name: x.name,
                    email: x.email
                };
            });

            res.json({ 'users': us });
        });
}
exports.getAll = getAll;


/**
    GET /user/:id
*/
function getOne(req, res) {
    var User = mongoose.model('User');

    User.findById(req.params.id, function (err, user) {
        if (err) {
            res.json(httpStatus.INTERNAL_SERVER_ERROR, { 'error': err });
            return;
        }

        if (!user) {
            res.json(httpStatus.NOT_FOUND, null);
            return;
        }

        var u = {
            _id: user._id,
            email: user.email
        };

        res.json({ 'user': u });
    });
}
exports.getOne = getOne;


/**
    POST /user/
*/
function create(req, res) {
    var User = mongoose.model('User');

    var doc = {
        name: req.body.user.name,
        email: req.body.user.email,
        password: req.body.user.password,
        channel: null,
        follows: null
    };

    User.create(doc, function (err, user) {
        if (err) {
            res.json(httpStatus.INTERNAL_SERVER_ERROR, { 'error': err });
            return;
        }

        res.json(httpStatus.CREATED, { 'user': user });
    });
}
exports.create = create;


/**
    PUT /user/:id
*/
function update(req, res) {
    var User = mongoose.model('User');

    User.findById(req.params.id, function (err, user) {
        if (err) {
            res.json(httpStatus.INTERNAL_SERVER_ERROR, { 'error': err });
            return;
        }

        if (!user) {
            res.json(httpStatus.NOT_FOUND, null);
            return;
        }

        user.name = req.body.user.name;
        user.email = req.body.user.email;
        if (req.body.user.password) {
            user.password = req.body.user.password;
        }
        user.save(function (err) {
            if (err) {
                res.json(httpStatus.INTERNAL_SERVER_ERROR, { 'error': err });
                return;
            }

            res.json(httpStatus.OK, null);
        });
    });
}
exports.update = update;


/**
    DELETE /user/:id
*/
function remove(req, res) {
    var User = mongoose.model('User');

    User.findById(req.params.id, function (err, user) {
        if (err) {
            res.json(httpStatus.INTERNAL_SERVER_ERROR, { 'error': err });
            return;
        }

        if (!user) {
            res.json(httpStatus.NOT_FOUND, null);
            return;
        }

        user.remove(function (err) {
            if (err) {
                res.json(httpStatus.INTERNAL_SERVER_ERROR, { 'error': err });
                return;
            }

            res.json(httpStatus.OK, null);
        });
    });
}
exports.remove = remove;


/**
    POST /login/
*/
function login(req, res, next) {
    passport.authenticate('local', function (err, user) {
        if (err) {
            return res.json(httpStatus.INTERNAL_SERVER_ERROR, { 'error': err });
        }

        if (!user) {
            return res.json(httpStatus.UNAUTHORIZED, { 'user': null });
        }

        req.login(user, function (err) {
            if (err) {
                return next(err);
            }

            return res.json({ 'user': req.user });
        });
    })(req, res, next);
}
exports.login = login;


/**
    POST /logout/
*/
function logout(req, res) {
    req.logout();
    res.json(httpStatus.OK);
}
exports.logout = logout;