/**
 * 客户端App状态库。
 *
 * 客户端App状态对每个用户来讲只保存一个，不区分设备。
 * 因此当用户从iOS切换至Android平台时，先前的状态将被新的替换。
 *
 * author: Sand
 * since: 12/14/2016
 */
"use strict";

let ImDb = require("./db/im.db.js");

class AppStatusRepo {
    constructor() {
    }

    /**
     * 查找客户端App状态。
     *
     * @param userId
     * @param handler
     */
    static findOne(userId, handler) {
        let sql = "SELECT platform, token, client_id, app_in_bg, last_login_time " +
            "FROM app_status WHERE user_id = ?";

        ImDb.execQuery({
            "sql": sql,
            "args": [userId],
            "handler": handler
        });
    };

    /**
     * 保存App的最新状态。
     *
     * @param userId
     * @param deviceToken
     * @param client_id
     * @param platform
     * @param handler
     */
    static save(userId, deviceToken, client_id, platform, handler) {
        let sql = "INSERT INTO app_status (user_id, platform, token, client_id, app_in_bg, last_login_time) " +
            "VALUES (?, ?, ?, ?, 0, now()) " +
            "ON DUPLICATE KEY UPDATE platform=?, token=?, client_id=?, app_in_bg=0,last_login_time=now()";

        ImDb.execQuery({
            sql: sql,
            args: [userId, platform, deviceToken, client_id, platform, deviceToken, client_id],
            handler: function(err,res){
                handler(err,res);
            }
        });
    };

    /**
     * 更新App前后台状态。
     *
     * @param userId
     * @param appInBg
     * @param handler
     */
    static updateStatus(userId, appInBg, handler) {
        ImDb.execQuery({
            "sql": "UPDATE app_status SET app_in_bg = ? WHERE user_id = ",
            "args": [appInBg, userId],
            "handler": handler
        });
    };

    /**
     * 销毁用户状态
     *
     * @param userId
     * @param handler
     */
    static destroy(userId, handler) {
        ImDb.execQuery({
            "sql": "DELETE FROM app_status WHERE user_id = ?",
            "args": [userId],
            "handler": handler
        });
    };
}

module.exports = AppStatusRepo;