/**
 * 会话成员模型。
 */
"use strict";

let RedisModel = require('./../redis.model.js');
let ModelUtil = require('../../util/model.util');
let RedisClient = require('../../repository/redis/redis.client.js');
let ParticipantRepo = require('../../repository/mysql/participant.repo');

let log = require('../../util/log.js');
let redis = RedisClient.redisClient().connection;

const REDIS_KEYS = require('../../include/commons').REDIS_KEYS;

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

    /**
     * 获取会话的成员列表
     *
     * @param sessionId
     */
    getParticipants(sessionId, handler) {
        let participant_key = super.makeRedisKey(REDIS_KEYS.Participants, sessionId);
        redis.existsAsync(participant_key).then(function (res) {
            if (res) {
                redis.zrangeAsync(participant_key, 0, -1).then(function (res) {
                    handler(res);
                })
            } else {
                ParticipantRepo.findParticipants(sessionId, handler);
            }
        })
    }

    /**
     * 会话中是否存在指定成员
     *
     * @param sessionId
     * @param userId
     * @param handler
     */
    existsParticipant(sessionId, userId, handler) {
        let participant_key = super.makeRedisKey(REDIS_KEYS.Participants, sessionId);
        redis.existsAsync(participant_key).then(function (res) {
            if (res) {
                // get from redis
                redis.zrangeAsync(participant_key, 0, -1).then(function (res) {
                    let exists = false;
                    for (var j in res) {
                        var value = res[j];
                        if (value == userId) {
                            exists = true;
                            break;
                        }
                    }

                    handler(null, exists);
                })
            } else {
                // get from mysql
                ParticipantRepo.existsParticipant(sessionId, userId, handler);
            }
        })
    }


    /**
     * 获取P2P成员所在会话
     *
     * @param patient
     * @param doctor
     */
    getSessionIdByParticipants(patient, doctor, handler) {
        ParticipantRepo.findSessionIdByParticipantIds(patient, doctor, handler);
    }

    /**
     * 将成员写入redis
     *
     * @param session_id 会话ID
     * @param users 用户集合
     * @param createDate 创建日期
     * @param handler 回调
     */
    saveParticipantsToRedis(session_id, users, createDate, handler) {
        let participants_key = super.makeRedisKey(REDIS_KEYS.Participants, session_id);
        for (var j in users) {
            let user_session_key = super.makeRedisKey(REDIS_KEYS.UserSessions, users[j]);
            redis.zaddAsync(participants_key, createDate.getTime(), users[j]).then(function (res) {
                    return redis.zaddAsync(user_session_key, createDate.getTime(), session_id);
                }
            ).catch(function (err) {
                log.error("createParticipantsToRedis is fail error:" + err + ",session_id:" + session_id + ",users:" + users.join(","));
                handler(false);
            });
        }

        handler(true);
    }

    /**
     * mysql成员创建
     *
     * @param session_id
     * @param users
     */
    saveParticipantsToMysql(session_id, users) {
        return ParticipantRepo.createParticipantsToMysql(session_id, users);
    }

    /**
     * MUC成员创建
     * @param users
     */
    createMUCParticipants(users) {
        return true;
    }

    /**
     * 移除成员
     * @param sessionId
     * @param userId
     */
    deleteUser(sessionId, userId) {
        let self = this;
        let participants_key = super.makeRedisKey(REDIS_KEYS.Participants, sessionId);
        let user_session_key = super.makeRedisKey(REDIS_KEYS.UsersSessions, userId);

        //1.移除SESSION成员表中的成员信息
        redis.zremAsync(participants_key, userId).then(function (res) {
            log.info("remove participants:" + res);

            //2.删除对应人员的Session列表
            redis.zremAsync(user_session_key, sessionId).then(function (res) {
                log.info("remove user_session:" + res);

                //3.移除数据库中的人员记录
                self.deleteUserFromMysql(sessionId, userId);
                ModelUtil.emitData(self.eventEmitter, {"status": 200, "msg": "人员删除成功！"});
            }).catch(function (err) {
                ModelUtil.emitData(self.eventEmitter, {"status": -1, "msg": "人员删除失败！" + err});
            })
        }).catch(function (err) {
            ModelUtil.emitData(self.eventEmitter, {"status": -1, "msg": "人员删除失败！" + err});
        })
    }

    /**
     * 添加讨论组成员
     * @param sessionId
     * @param user
     */
    pushUser(sessionId, user) {
        let self = this;
        let users = [];
        users.push(user);
        self.saveParticipantsToRedis(sessionId, users, new Date(), function (res) {
            if (res) {
                self.saveParticipantsToMysql(sessionId, users);
            } else {
                ModelUtil.emitData(self.eventEmitter, {"status": -1, "msg": "人员添加失败！"});
            }
        })
    }

    /**
     * user从数据库中删除
     * @param sessionId 会话
     * @param user 用户
     */
    deleteUserFromMysql(sessionId, user) {
        ParticipantRepo.deleteUserFromMysql(sessionId, user);
    }

}

// Expose class
module.exports = Participants;