/**
 * 404 错误
 * @return {[type]}
 */
const headerModel = require('../models/header');
const logger = global.yoho.logger;

const forceNoCache = (res) => {
    if (res) {
        res.set({
            'Cache-Control': 'no-cache',
            Pragma: 'no-cache',
            Expires: (new Date(1900, 0, 1, 0, 0, 0, 0)).toUTCString()
        });
    }
};

exports.notFound = () => {
    return (req, res, next) => {
        forceNoCache(res);

        if (req.xhr) {
            return res.status(404).json({
                code: 404,
                message: '抱歉，页面不存在！'
            });
        }

        headerModel.requestHeaderData(req.yoho.channel).then((result) => {
            return res.status(404).render('error/404', {
                module: 'common',
                page: 'error',
                title: '页面不存在 | Yoho!Buy有货 | 潮流购物逛不停',
                headerData: result.headerData
            });
        }).catch(next);

    };
};

/**
 * 服务器错误
 * @return {[type]}
 */
exports.serverError = () => {
    return (err, req, res, next) => {
        forceNoCache(res);

        logger.error(`error at path: ${req.url}`);
        logger.error(err);
        if (!res.headersSent) {
            if (req.xhr) {
                return res.status(500).json({
                    code: 500,
                    message: '服务器错误！'
                });
            }

            const renderErrPage = (result) => {
                result = result || {};

                res.status(500).render('error/500', {
                    module: 'common',
                    page: 'error',
                    err: err,
                    title: '服务器错误 | Yoho!Buy有货 | 潮流购物逛不停',
                    headerData: result.headerData
                });
            };

            return headerModel.requestHeaderData(req.yoho.channel).then(renderErrPage).catch(() => {
                renderErrPage();
            });
        }
        next(err);
    };
};