/**
 * 会话模型。
 */
"use strict";

let RedisClient = require('../../repository/redis/redis.client.js');
let redisClient = RedisClient.redisClient();
let redis = redisClient.connection;
let RedisModel = require('./../redis.model.js');
let modelUtil = require('../../util/model.util');
let Messages = require('../messages/messages');
let Participants = require('./Participants')
let log = require('../../util/log.js');
const RedisKeys = require('../../include/commons').REDIS_KEYS;
const Commons = require('../../include/commons');
let configFile = require('../../include/commons').CONFIG_FILE;
let config = require('../../resources/config/' + configFile);
let SessionRepo = require('../../repository/mysql/session.repo');
let mongoose = require('mongoose');

class Sessions extends RedisModel {
    constructor() {
        super();
    }

    /**
     * 获取某个用户的全部session列表
     * @param userId
     * @param handler
     */
    getUserSessionsFromMysql(userId,handler){
        SessionRepo.getUserSessionsFromMysql(userId,handler);
    }

    /**
     * 获取session单个对象
     * @param sessionId
     * @param handler
     */
    getSessions(sessionId,handler){
        SessionRepo.getSessions(sessionId,handler);
    }

    /**
     * 根据用户ID获取用户的session列表
     * @param userId
     */
    getUserSessions(userId,page,pagesize){
        let user_session_key =  super.makeRedisKey(RedisKeys.UsersSessions,userId);
        let self = this;
        let _super = super.makeRedisKey;
        if(page >0){
            page = page*pagesize;
            pagesize = pagesize+page;
        }
        //倒序
        redis.zrevrangeAsync(user_session_key,page,pagesize).then(function(res){
            let sessionlist =[];
            if(res.length==0){
                modelUtil.emitData(self.eventEmitter,{"status":200,"data":res});
            }else{
                for(var j in res){
                    calllist(res[j],j,res.length);
                }
            }
            function calllist(session,j,_len){
                let session_key =_super(RedisKeys.Session,session);
                redis.hgetallAsync(session_key).then(function(res){
                    let participants_key = _super(RedisKeys.Participants,session);
                    //当前用户最后一次登录改讨论组时间
                    redis.zscoreAsync(participants_key,userId).then(function(restimestamp){
                        //时间差获取消息数量
                        callamount(res,j,_len,session,restimestamp);
                    })
                }).catch(function(err){
                    throw err;
                })
            }

            /**
             * 消息统计
             * @param res 返回的会话列表
             * @param j 当前会话列表的位置
             * @param _len 列表长度 用做返回前端操作
             * @param session 当前会话
             * @param restimestamp 当前会话当前用户的最后一次时间搓
             */
            function callamount(res,j,_len,session,restimestamp){
                let message_time_key = _super(RedisKeys.MessagesTimestamp,session);
                redis.zrangebyscoreAsync(message_time_key,restimestamp,(new Date().getTime())).then(function(messagetimelist){
                    res.sessionId = session;
                    res.message = messagetimelist.length;
                    callback(res,j,_len);
                }).catch(function(err){
                    throw err;
                })
            }

            /**
             * 列表封装完毕后由此回调返回数据界面
             * @param res
             * @param j
             * @param _len
             */
            function callback(res,j,_len){
                sessionlist.push(res);
                if(j==(_len-1)){
                    modelUtil.emitData(self.eventEmitter,{"status":200,"data":sessionlist});
                }
            }
        }).catch(function(res){
            modelUtil.emitData(self.eventEmitter,"get list error "+res+",user:"+userId);
        })
    }

    /**
     * 根据sessionId获取对应的消息
     * @param sessionId 会话ID
     * @param user 拉取消息的人
     * @param page 第几页
     * @param pagesize 分页数量
     */
    getSessionMessages(sessionId,user,page,pagesize){
        let self = this;
        let message_timestamp_key = super.makeRedisKey(RedisKeys.MessagesTimestamp,sessionId);
        let message_key = super.makeRedisKey(RedisKeys.Messages,sessionId);
        let participants_key = super.makeRedisKey(RedisKeys.Participants,sessionId);
        //超过最大限制后从mysql获取数据
        if(page*pagesize>=config.sessionConfig.maxMessageCount){
            let message = new Messages();
            message.getMessageByPage(sessionId,page,pagesize,function(err,res){
                if(!err){
                      modelUtil.emitData(self.eventEmitter,{"status":200,"data":res});
                }else{
                    modelUtil.emitData(self.eventEmitter,{"status":-1,"data":err});
                }
            })
        }else{
            if(page>0){
                page = page*pagesize;
                pagesize = pagesize+page;
            }
            let participants = new Participants();
            participants.existsUser(sessionId,user,function(res){
                if(!res){
                    modelUtil.emitData(self.eventEmitter,{"status":-1,"msg":"用户不在此会话中！"});
                }else{
                    //倒序取出最后N条消息
                    redis.zrevrangeAsync(message_timestamp_key,page,pagesize).then(function(res){
                        //取出消息实体
                        if(res.length==0){
                            modelUtil.emitData(self.eventEmitter,{"status":200,"data":[]});
                            return;
                        }
                        redis.hmgetAsync(message_key,res).then(function(messages) {
                            console.log(messages)
                            //将取到的消息返回给前端
                            modelUtil.emitData(self.eventEmitter,{"status":200,"data":messages});
                        }).then(function(){
                            //更新患者最后一次获取消息的日期
                            redis.zaddAsync(participants_key, (new Date().getTime()),user).then(function(res){
                                console.log(res);
                            }).catch(function(res){
                                throw res;
                            })
                        })
                    }).catch(function(res){
                        modelUtil.emitData(self.eventEmitter,{"status":-1,"msg":res});
                    })
                }
             })
        }
    }

    /**
     * 更新最后一条消息
     * @param session_key rediskey
     * @param create_date 创建时间
     * @param last_content 最后一条消息内容
     * @param last_content_type 消息类型
     * @param type 会话类型
     * @param sender 发送者ID
     * @param sendername 发送者名字
     * @param name 议题名称
     * @returns {*}
     */
    updateLastContent(session_key,session_type,name,message){
        return redis.hmsetAsync(session_key,
            "create_date", message.timestamp,
            "last_content", message.content,
            "last_content_type", message.contentType,
            "type", session_type,
            "senderId",message.senderId,
            "senderName",message.senderName,
            "name",name
        );
    }

    /**
     * 保存消息，用于消息发送
     * @param message
     * @param sessionId
     */
    saveMessageBySession(message,sessionId) {
        let self = this;
        let messages = new Messages();
        let participants = new Participants();
        let session_key = super.makeRedisKey(RedisKeys.Session,sessionId);
        let message_id = mongoose.Types.ObjectId().toString();
        let session_type = 0;
        let name = "";
        participants.existsUser(sessionId,messages.senderId,function(res){
            //校验发送成员是都在讨论组
            if(res){
                redis.hmgetAsync(session_key, ["type","name"]).then(function(res){
                    session_type = res[0];
                    name  = res[1];
                    if(!session_type||!name){
                        log.error("session is error for key "+session_key);
                        throw "session is not found";
                    }
                }).then(function(res){
                    //更新消息相关
                    return  messages.saveMessageForRedis(message_id,sessionId,message);
                }).then(function (res) {
                    //更新session的最后一条聊天记录
                    return self.updateLastContent(session_key,session_type,name,message);
                }).then(function (res) {
                    //操作mysql数据库
                    messages.saveMessageForMysql(message,session_type,message_id,sessionId);
                    //返回数据给前端。
                    modelUtil.emitData(self.eventEmitter, {"status":200,"msg":"发送成功！"});
                    //消息推送
                }).catch(function (res) {
                    modelUtil.emitData(self.eventEmitter,{"status":-1,"msg":res});
                })
            }else{
                modelUtil.emitData(self.eventEmitter,{"status":-1,"msg":"用户不在此会话当中！"});
            }
        })
    }

    /**
     * 非MUC模式创建会话
     * @param sessionId 会话ID
     * @param name 会话名称
     * @param type 会话类型
     * @param users 会话成员
     */
    createSessions(sessionId,name,type,users){
        if(type==2){

        }
        let self = this;
        let createDate = new Date();
        let session_key = super.makeRedisKey(RedisKeys.Session,sessionId);
        let participants  = new Participants();
        //将session加入reids
        participants.createParticipantsToRedis(sessionId,users.split(","),createDate,function(res){
            if(!res){
                modelUtil.emitData(self.eventEmitter, {"status":-1,"msg":res});
            }else{
                let messages={};
                messages.senderId="system";
                messages.senderName="系统消息";
                messages.timestamp=createDate;
                messages.content=""
                messages.contentType="1";
                self.updateLastContent(session_key,type,name,messages);
                modelUtil.emitData(self.eventEmitter, {"status":200,"msg":"session create success！"});
                self.saveSessionToMysql(sessionId,name,type,createDate);
                //创建session成员到数据库
                participants.createParticipantsToMysql(sessionId,users.split(","));
            }
        })
    }

    /**
     * 保存session到sql数据库
     * @param sessionId
     * @param name
     * @param type
     * @param createDate
     */
    saveSessionToMysql(sessionId,name,type,createDate){
        SessionRepo.saveSessionToMysql(sessionId,name,type,createDate);
    }

    /**
     *置顶操作
     */
    stickSession(sessionId,user){
        let user_session_key = super.makeRedisKey(RedisKeys.UsersSessions,user);
        let self = this;
        //取出最大的session
        redis.zrevrangeAsync(user_session_key,0,0).then(function(res){
            //获取该session的时间搓
            redis.zscoreAsync(user_session_key,res).then(function(scoreres){
                let nowtime = new Date().getTime();
                //当前时间搓比redis的时间搓更早证明没有置顶过
                if(scoreres<=nowtime){
                    //初始化置顶
                   redis.zaddAsync(user_session_key, Commons.STICK_NUM,sessionId).then(function(res){
                       log.info("stickSession:"+sessionId+",res:"+res);
                       modelUtil.emitData(self.eventEmitter,{"status":200,"msg":"置顶成功！"});
                   })
                }else{
                    //已有置顶的数据，取出来加1保存回去
                    scoreres =  scoreres+1;
                    redis.zaddAsync(user_session_key, scoreres,sessionId).then(function(){
                        log.info("stickSession:"+sessionId+",res:"+res);
                        modelUtil.emitData(self.eventEmitter,{"status":200,"msg":"置顶成功！"});
                    })
                }
            })
        })
    }

    /**
     *取消置顶操作
     */
    cancelStickSession(sessionId,user){
        let user_session_key = super.makeRedisKey(RedisKeys.UsersSessions,user);
        let participants_key = super.makeRedisKey(RedisKeys.Participants,sessionId);
        let self = this;
        redis.zscoreAsync(participants_key,user).then(function(res){
            if(!res){
                res = new Date().getTime();
            }
            redis.zaddAsync(user_session_key, res,sessionId).then(function(res){
                log.info("cancelStickSession:"+sessionId);
                modelUtil.emitData(self.eventEmitter,{"status":200,"msg":"取消置顶成功！"});
            });
        })
    }

}

// Expose class
module.exports = Sessions;