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

const forceNoCache = (res) => {
    if (res && !res.finished) {
        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) => {
        forceNoCache(res);

        res.status(404);

        if (req.xhr) {
            return res.json({
                code: 404,
                message: '抱歉，页面不存在！'
            });
        }
        return res.render('error/404', {
            module: 'common',
            page: 'error',
            title: '页面不存在 | Yoho!Buy有货 | 潮流购物逛不停',
            pageHeader: headerModel.setNav({
                navTitle: '抱歉，页面不存在！'
            }),
            pageFooter: true,
            isErr: true
        });
    };
};

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

        if (err && err.code === 401) {
            if (req.xhr) {
                return res.status(401).json(err);
            } else if (req.yoho.isApp) {
                if (err.lowVersion) {
                    return res.render('error/app-auth', {
                        module: 'common',
                        page: 'app-update',
                        localCss: true,
                        message: err.message
                    });
                }
                return res.render('error/app-auth', {
                    module: 'common',
                    page: 'app-redirect-login',
                    message: '验证失败，请登录',
                    localCss: true,
                    refer: err.refer
                });
            } else {
                return res.redirect(helpers.urlFormat('/signin.html', {
                    refer: req.originalUrl
                }));
            }
        }

        logger.error(`error at path: ${req.url}`);
        logger.error(err);

        if (!res.headersSent) {
            res.status(err.code || 500);

            if (req.xhr) {
                return res.json({
                    code: 500,
                    message: '服务器错误！'
                });
            }

            return res.render('error/500', {
                err: err,
                module: 'common',
                page: 'error',
                title: '服务器错误 | Yoho!Buy有货 | 潮流购物逛不停',
                pageHeader: headerModel.setNav({
                    navTitle: '服务器错误！'
                }),
                pageFooter: true,
                isErr: true
            });
        }
        next(err);
    };
};