'use strict';

/**
 * [cacheValue 缓存对象]
 * @author        szjcomo
 * @createTime 2020-09-29
 * @param      {[type]}   key    [description]
 * @param      {[type]}   value  [description]
 * @param      {[type]}   expire [description]
 * @return     {[type]}          [description]
 */
const Cache = function(key,value,expire) {
    this.szjcomo_key = key;
    this.szjcomo_value = value;
    this.expire_time = expire;
}

/**
 * [instanceof 判断是否是自身的对象]
 * @author 	   szjcomo
 * @createTime 2020-09-29
 * @param      {[type]}   obj [description]
 * @return     {[type]}       [description]
 */
Cache.instanceof = function(obj) {
    if(obj instanceof Object) {
        if(obj.hasOwnProperty('szjcomo_key') && obj.hasOwnProperty('szjcomo_value')) return true;
        return false;
    }
    return false;
}


export const localStore = {
    /**
     * [get 获取本地存储]
     * @author        szjcomo
     * @createTime 2020-09-29
     * @param      {[type]}   key [description]
     * @return     {[type]}       [description]
     */
    get:function(key) {
    	let that = this;
        let result = window.localStorage.getItem(key);
        if(!result) return false;
        try {
            let obj = JSON.parse(result);
            if(Cache.instanceof(obj)) {
                let curTime = new Date().getTime();
                if(obj.expire_time == 0) return obj.szjcomo_value;
                if(obj.expire_time >= curTime) return obj.szjcomo_value;
                that.del(obj.szjcomo_key);
                return false;
            } else {
                return obj;
            }
        } catch(err) {
            console.error(err);
            return false;
        }
    },
    /**
     * [set 设置缓存]
     * @author        szjcomo
     * @createTime 2020-09-29
     * @param      {[type]}   key     [description]
     * @param      {[type]}   value   [description]
     * @param      {[type]}   seconds [description]
     */
    set:function(key,value,seconds = 0) {
        try {
        	let tmp_expire = 0;
        	if(seconds > 0) tmp_expire = (new Date().getTime() + seconds * 1000);
        	let tmpObj = new Cache(key,value,tmp_expire);
        	window.localStorage.setItem(key,JSON.stringify(tmpObj));
        	return true;
        } catch(err) {
            console.error(err);
            return false;
        }
    },
    /**
     * [del 删除缓存]
     * @author 	   szjcomo
     * @createTime 2020-09-29
     * @param      {[type]}   key [description]
     * @return     {[type]}       [description]
     */
    del:function(key) {
    	return window.localStorage.removeItem(key);
    }
};

/**
 * [sessStore session存储]
 * @type {Object}
 */
export const sessStore = {
    /**
     * [get 获取本地存储]
     * @author        szjcomo
     * @createTime 2020-09-29
     * @param      {[type]}   key [description]
     * @return     {[type]}       [description]
     */
    get:function(key) {
    	let that = this;
        let result = window.sessionStorage.getItem(key);
        if(!result) return false;
        try {
            let obj = JSON.parse(result);
            if(Cache.instanceof(obj)) {
                let curTime = new Date().getTime();
                if(obj.expire_time == 0) return obj.szjcomo_value;
                if(obj.expire_time >= curTime) return obj.szjcomo_value;
                that.del(obj.szjcomo_key);
                return false;
            } else {
                return obj;
            }
        } catch(err) {
            console.error(err);
            return false;
        }
    },
    /**
     * [set 设置缓存]
     * @author        szjcomo
     * @createTime 2020-09-29
     * @param      {[type]}   key     [description]
     * @param      {[type]}   value   [description]
     * @param      {[type]}   seconds [description]
     */
    set:function(key,value,seconds = 0) {
        try {
        	let tmp_expire = 0;
        	if(seconds > 0) tmp_expire = (new Date().getTime() + seconds * 1000);
        	let tmpObj = new Cache(key,value,tmp_expire);
        	window.sessionStorage.setItem(key,JSON.stringify(tmpObj));
        	return true;
        } catch(err) {
            console.error(err);
            return false;
        }
    },
    /**
     * [del 删除缓存]
     * @author 	   szjcomo
     * @createTime 2020-09-29
     * @param      {[type]}   key [description]
     * @return     {[type]}       [description]
     */
    del:function(key) {
    	return window.sessionStorage.removeItem(key);
    }
};

/**
 * [szjcomoCache 导出缓存类]
 * @author 	   szjcomo
 * @createTime 2020-09-29
 * @param      {String}   type [description]
 * @return     {[type]}        [description]
 */
const szjcomoCache = function(type = 'sess') {
	if(type == 'sess') {
		if(!window.sessionStorage) throw new Error('您的浏览器不支持本地sessionStorage存储');
		return sessStore;
	}
	if(!window.localStorage) throw new Error('您的浏览器不支持本地localStorage存储');
	return localStore;
}

export default szjcomoCache;