/**
 * Created by zhengguorong on 16/11/1.
 */
const User = require('./user.model')
const config = require('../../config')
const jwt = require('jsonwebtoken')

/**
 * 处理提交表单验证错误
 * @param res
 * @param statusCode
 * @returns {Function}
 */
const validationError = (res, statusCode) => {
    statusCode = statusCode || 422;
    return function (err) {
        return res.status(statusCode).json(err);
    };
}

const handleError = (res, statusCode) => {
    statusCode = statusCode || 500;
    return function (err) {
        return res.status(statusCode).send(err);
    };
}

module.exports.index = (req, res) => {
    return User.find({}, '-salt -password').exec()
        .then(users => {
            res.status(200).json(users);
        })
        .catch(handleError(res));
}

module.exports.findByToken = (token) => {
    return User.findOne({ token: token }).exec()
}

/**
 * 创建用户
 * @param req
 * @param res
 */
module.exports.create = (req, res) => {
    let newUser = new User(req.body)
    newUser.provider = 'local'
    newUser.role = 'user'
    newUser.save()
        .then((user) => {
            let token = jwt.sign({ _id: user._id }, config.secrets.session, {
                expiresIn: 60 * 60 * 5
            })
            user.token = token
            var updateUser = JSON.parse(JSON.stringify(user))
            delete updateUser._id
            User.findOneAndUpdate({ _id: user._id }, updateUser).exec()
            res.json({ token })
        })
        .catch(validationError(res))
}

/**
 * 获取单个用户信息
 */
module.exports.show = (req, res, next) => {
    let userId = req.params.id
    return User.findById(userId).exec()
        .then(user => {
            if (!user) {
                return res.status(400).end()
            }
            res.json(user.profile)
        })
        .catch(err => next(err))
}

/**
 * 删除用户
 * @param req
 * @param res
 * @returns {Promise.<TResult>|Promise}
 */
module.exports.destroy = (req, res) => {
    return User.findByIdAndRemove(req.params.id).exec()
        .then(() => {
            res.status(204).end()
        })
        .catch(handleError(res))
}

/**
 * 修改密码
 * @param req
 * @param res
 * @returns {Promise.<TResult>}
 */
module.exports.changePassword = (req, res) => {
    var uesrId = req.user._id
    var oldPass = String(req.body.oldPassword)
    var newPass = String(req.body.newPassword)
    return User.findById(uesrId).exec()
        .then(user => {
            if (user.authenticate(oldPass)) {
                user.password = newPass
                return user.save()
                    .then(() => {
                        res.status(204).end()
                    })
                    .catch(validationError(res))
            } else {
                return res.status(403).end()
            }
        })
}


/**
 * 用户登陆
 * @param req
 * @param res
 * @returns {Promise.<TResult>}
 */
module.exports.login = (req, res) => {
    var loginId = req.body.loginId
    var password = req.body.password
    let token
    return User.findOne({ loginId: loginId }).exec()
        .then(user => {
            if (user && user.authenticate(password)) {
                token = jwt.sign({ _id: user._id }, config.secrets.session, {
                    expiresIn: 60 * 60 * 5
                })
                user.token = token
                var updateUser = JSON.parse(JSON.stringify(user))
                delete updateUser._id
                User.findOneAndUpdate({ _id: user._id }, updateUser).exec()
                res.status(200).json({ token }).end()
            } else {
                return res.status(401).end()
            }
        })
}

/**
 * 查看用户信息
 * @param req
 * @param res
 * @param next
 * @returns {Promise.<TResult>|Promise}
 */
module.exports.me = (req, res, next) => {
    var userId = req.user._id
    return User.findOne({ _id: userId }, '-salt -password').exec()
        .then(user => { // don't ever give out the password or salt
            if (!user) {
                return res.status(401).end();
            }
            res.json(user);
        })
        .catch(err => next(err));
}