/**
 * 搜索功能。
 */
"use strict";

let ImDb = require('../mysql/db/im.db');
let DbUtil = require('../../util/db.util');
let log = require('../../util/log.js');
const DB_TABLES = require('../../include/commons').DB_TABLES;

class ParticipantRepo {
    constructor() {
    }

    /**
     * 获取会话的成员列表
     *
     * @param sessionId
     * @param handler
     */
    static findParticipants(sessionId, handler) {
        let sql = "select participant_id, participant_role, last_fetch_time from participants where session_id = ? ";

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

    /**
     * 获取会话的成员列表
     *
     * @param sessionId
     * @param handler
     */
    static updateParticipant(sessionId, participant_id, role,handler) {
        let sql = "update participants set participant_role = ? where session_id = ? and participant_id = ?";
        ImDb.execQuery({
            "sql": sql,
            "args": [role, sessionId, participant_id],
            "handler": handler
        });
    }

    /**
     * 获取P2P成员所在会话。将成员的ID排序后取哈希值即可。
     *
     * @param userId
     * @param anotherUserId
     * @param handler
     */
    static findSessionIdByParticipantIds(userId, anotherUserId, handler) {
        let sessionId = DbUtil.stringArrayHash([userId, anotherUserId]);
        handler(null, sessionId);
    }

    /**
     * 用户是否在指定Session中
     *
     * @param sessionId
     * @param userId
     * @param handler
     */
    static existsParticipant(sessionId, userId, handler) {
        let sql = "select case when count(*) > 0 then true else false end exist from participants w where w.session_id =? and w.participant_id = ? ";
        ImDb.execQuery({
            "sql": sql,
            "args": [sessionId, userId],
            "handler": handler
        });
    }

    /**
     * mysql成员创建
     *
     * @param sessionId
     * @param users JSON
     * @param handler
     */
    static saveParticipantsToMysql(sessionId, users, handler) {
        let sql = "insert into " + DB_TABLES.Participants + " (session_id,participant_id,participant_role) VALUES "
        let args = [];
        for (var j in users) {
            sql += "(?,?,?)";

            let tokens = users[j].split(":");
            args.push(sessionId);
            args.push(tokens[0]);
            args.push(tokens.length > 1 ? tokens[1] : '0');

            if (j != users.length - 1) sql += ", ";
        }

        sql += " ON DUPLICATE KEY UPDATE participant_role = VALUES(participant_role)";

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

    static deleteUserFromMysql(sessionId, userId) {
        let sql = "delete from " + DB_TABLES.Participants + " where user_id=? and session_id=? ";
        ImDb.execQuery({
            "sql": sql,
            "args": [userId, sessionId],
            "handler": handler
        });
    }

    static getPatientOpenid(code, handler) {
        var sql = "select openid from patients where code = ? ";

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

module.exports = ParticipantRepo;