/**
 * 秒杀页面
 * @author: 陈峰<feng.chen@yoho.cn>
 * @date: 2016/09/08
 */

'use strict';
const Promise = require('bluebird');
const logger = global.yoho.logger;
const moment = require('moment');
const mRoot = '../models';
const headerModel = require('../../../doraemon/models/header');
const seckillModel = require(`${mRoot}/seckill`);

/**
 * [时间缺0补0]
 */
const _timeFormat = (tick) => {
    return tick < 10 ? `0${tick}` : tick;
};


/**
 *  秒杀商品 添加 自定义属性
 *  ----------------------------------------
 * 已开抢
 *      product.over [APP,H5: 1.已抢光 2.过了endTime]
 *      product.isSeckill [APP,H5 秒杀中， 与over互斥]
 * 抢购中:
 *      product.over
 *      product.isSeckill
 * 即将开抢:
 *      product.wait = true
 *      product.remindFlag = true   [APP: 已添加提醒]
 *      product.remindFalg = false  [APP: 默认提醒状态]
 *      Product.hideRemind = true   [APP: queryRemindList接口失败的情况下]
 */
function _productAddFlag(productList, remindList) {
    let now = Date.now();

    productList
        .sort((a, b) => b.orderBy - a.orderBy)
        .forEach(product => {
            let startTime = product.startTime * 1000; // s to ms
            let endTime = product.endTime * 1000;

            product.remindFlag = false;
            product.readableTime = moment.unix(product.startTime).format('MM月DD日 HH:mm');

            if (now < startTime) { // 未开抢
                product.wait = true;
                product.isSeckill = true;

                if (!remindList) {
                    product.hideRemind = true;
                } else if (remindList.length) {
                    for (let i = 0, j = remindList.length; i < j; i++) {
                        if (remindList[i].productSkn === product.productSkn) {  // remind on;
                            product.remindFlag = true;
                            remindList.splice(i, 1);
                            break;
                        }
                    }
                }
            } else if (product.secKillStatus === 0 || (now > endTime)) { // 确实已抢光, 过了秒杀时间
                product.over = true;
                product.isSeckill = false;
            } else {
                product.isSeckill = true;
            }
        });

    return productList;
}

/**
 *    获取 秒杀产品列表
 */
function fetchProductList(activityInfo, uid) {
    let activityId = activityInfo.activityId;
    let hasRemindAttr = activityInfo.isApp && uid && (Date.now() < activityInfo.startTime);

    let productList = seckillModel.queryProductList(activityId);
    let remindList = hasRemindAttr ? seckillModel.queryRemindList(activityId, uid) : {
        code: 200,
        data: []
    };

    return Promise.all([productList, remindList])
        .then(res => {
            let r1 = res[0];
            let r2 = res[1];
            let result = [];

            if (r1.code !== 200) {
                return result;
            }

            result = r2.data ?
                _productAddFlag(r1.data, r2.data) :
                _productAddFlag(r1.data);

            return result;
        });
}

let _helpers = {
    statusClass: (nav) => {
        if (nav.over) {
            return 'over';
        } else if (nav.now) {
            return 'now';
        } else if (nav.wait) {
            return 'wait';
        } else {
            return '';
        }
    },
    readaleTime: (unixStamp) => {
        return moment.unix(unixStamp).format('MM月DD日 HH:mm');
    }
};


/**
 * [秒杀列表页面]
 */
const index = (req, res, next) => {
    let headerData = headerModel.setNav({
        navTitle: '秒杀活动',
        navBtn: true,
    });

    if (!req.xhr) {
        return res.render('seckill', {
            title: '秒杀活动',
            pageHeader: headerData,
            pageFooter: true,
            width750: true,
        });
    }

    let result = {};
    let uid = req.yoho.isApp && req.query.uid;

    return seckillModel.queryActivity().then((resultActivity) => {
        // console.log(resultActivity)
        if (resultActivity.code !== 200) {
            return next();
        }

        if (!(
                resultActivity.data &&
                resultActivity.data.secKillProductVoList &&
                resultActivity.data.secKillProductVoList.length
            )) {
            return res.json({
                title: '秒杀活动',
                pageHeader: headerData,
                error: '来晚啦~秒杀已结束'
            });
        }

        result.activitys = resultActivity.data.secKillProductVoList.sort((a, b) => a.startTime - b.startTime); // orderBy startTime ASC
        let nowTime = Date.parse(new Date());

        result.activitys.forEach((activity, i) => {
            let date,
                hour = 0,
                minute = 0;

            activity.startTime *= 1000;
            date = new Date(activity.startTime);
            hour = date.getHours();
            minute = date.getMinutes();
            activity.time = `${_timeFormat(hour)}:${_timeFormat(minute)}`;

            if (nowTime > activity.startTime) { // 当前时间大于这个时间段，已经开始和即将开始两种情况
                if (i < result.activitys.length - 1) {
                    let nextTime = result.activitys[i + 1].startTime * 1000;

                    if (nowTime < nextTime) { // 下一个时间段与当前时间来区别是否正在抢购
                        activity.now = true;
                        activity.focus = true;
                    } else {
                        activity.over = true;
                    }
                } else { // 大于这个时间段但是后面没有秒抢时间端了，则依然显示抢购中
                    activity.now = true;
                }
            } else {
                activity.wait = true;
            }
        });
        if (result.activitys.length && result.activitys.findIndex(activity => activity.focus) < 0) {
            let i = result.activitys.length;

            // 没有focus的活动，则focus 最后一个 over 的活动
            while (i) {
                let activity = result.activitys[i - 1];

                if (activity.over) {
                    activity.focus = true;
                    break;
                }

                i = i - 1;
            }

            // 没有over，全部都是未开抢，则focus第一个
            if (!i) {
                result.activitys[0].focus = true;
            }
        }
        let focusActivity = result.activitys.find(activity => activity.focus);
        let activityInfo = {
            activityId: focusActivity.activityId,
            startTime: focusActivity.startTime * 1000,
            isApp: req.yoho.isApp
        };

        return fetchProductList(activityInfo, uid).then((resultProducts) => {
            result.products = resultProducts;

            // console.log(result);
            res.json(result);
        });
    });
};

/**
 * [xhr根据活动id获取商品列表]
 */
const getProductList = (req, res, next) => {
    if (!req.xhr) {
        return next();
    }
    let activityId = Number(req.query.activityId);
    let startTime = Number(req.query.startTime);
    let uid = req.yoho.isApp && req.query.uid;

    if (!activityId) {
        return next();
    }

    let activityInfo = {
        isApp: req.yoho.isApp,
        activityId,
        startTime
    };

    return fetchProductList(activityInfo, uid).then(resultProducts => {
        res.json({products: resultProducts});
    }).catch(error => {
        logger.error(error);
    });
};

// only app
const remind = (req, res, next) => {
    if (!(req.yoho.isApp && req.xhr)) {
        return res.status(404).json({
            msg: '请求不合法'
        });
    }

    return seckillModel.remind({
            on_off: req.body.on_off === 'true' ? true : false,
            activity_id: Number.parseInt(req.body.activity_id, 10),
            product_skn: Number.parseInt(req.body.product_skn, 10),
            uid: Number.parseInt(req.body.uid, 10),
            sec_kill_id: Number.parseInt(req.body.sec_kill_id, 10),
            app_type: 0
        })
        .then(result => {
            return res.json(result);
        });
};

// Middleware:检测 app_version 是否正确
// @param okVersion string  "5.1.0" [master_version, minor_version, patch_version]
// TODO: 可以移到 middleware;
const checkAppVer = function(okVersion) {
    return (req, res, next) => {
        /**
         * [比较app版本]
         * @param okVersion string '5.1.0'
         * @param curVersion string
         * @returns -1: 小于， 0 等于， 1大于
         */

        let compareVersion = (okVersion, curVersion) => { //eslint-disable-line
            let result = 0; // -1： 小于， 0 等于， 1 大于

            if (okVersion === curVersion) {
                return result;
            }

            okVersion = okVersion.split('.');
            curVersion = curVersion.split('.');

            for (var i = 0; i < 3; i++) {
                let standard = Number.parseInt(okVersion[i], 10) || 0;
                let cur = Number.parseInt(curVersion[i], 10) || 0;

                if (cur < standard) {
                    result = -1;
                    break;
                } else if (cur > standard) {
                    result = 1;
                    break;
                }
            }

            return result;
        };


        if (req.yoho.isApp) {
            let curVersion = req.query.app_version;
            let isOld = compareVersion(okVersion, curVersion) === -1;

            if (isOld) {
                return res.redirect('/passport/update');
            }
        }

        next();
    };
};

module.exports = {
    index,
    getProductList,
    remind,
    checkAppVer
};