/**
 * 会话库。
 */
"use strict";

let ImDb = require('../mysql/db/im.db');
let log = require('../../util/log.js');

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

class SessionRepo {
    constructor() {
    }

    /**
     * 获取单个session对象
     *
     * @param sessionId
     * @param handler
     */
    static findOne(sessionId, handler) {
        let sessionSQL = "select id,name,type,create_date from " + DB_TABLES.Sessions + " s where s.id = ?";
        ImDb.execQuery({
            "sql": sessionSQL,
            "args": [sessionId],
            "handler": handler || function (err, res) {
                if(err) log.error(err);
            }
        });
    }

    /**
     * 获取用户全部会话
     *
     * @param userId
     * @param handler
     */
    static findAll(userId, handler) {
        let sql = "select session_id from " + DB_TABLES.Participants + " w where w.participant_id = ? group by w.session_id";
        let sessionSQL = "select id, name, type, create_date, last_sender_id, last_sender_name, last_content_type, last_content, last_message_time from "
            + DB_TABLES.Sessions + " s where s.id in(" + sql + ")";
        ImDb.execQuery({
            "sql": sessionSQL,
            "args": [userId],
            "handler": handler || function (err, res) {
                if(err) log.error(err);
            }
        });
    }

    /**
     * 获取用户全部会话
     *
     * @param userId
     * @param type
     * @param handler
     */
    static findAllByType(userId, type, handler) {
        let sql = "select session_id from " + DB_TABLES.Participants + " w where w.participant_id = ? and type=? group by w.session_id";
        let sessionSQL = "select id, name, type, create_date, last_sender_id, last_sender_name, last_content_type, last_content, last_message_time from "
            + DB_TABLES.Sessions + " s where s.id in(" + sql + ") ";
        ImDb.execQuery({
            "sql": sessionSQL,
            "args": [userId, type],
            "handler": handler || function (err, res) {
                if(err) log.error(err);
            }
        });
    }

    /**
     * 按时间跨度查询会话。
     *
     * @param userId
     * @param dateSpan
     * @param handler
     */
    static findAllByTimestampAndType(userId, dateSpan, handler) {
        let sql = "SELECT DISTINCT s.id, CASE WHEN TYPE = 2 THEN d.name ELSE s.name END 'name', s.type, s.create_date, s.business_type " +
        "FROM sessions s, participants p " +
        "LEFT JOIN doctors d ON p.participant_id = d.id " +
        "WHERE s.id = p.session_id AND s.last_sender_id <> 'system' " +
        "AND UNIX_TIMESTAMP(s.last_message_time) > UNIX_TIMESTAMP(NOW()) - ? " +
        "AND p.participant_id <> ? " +
        "AND s.id in (select s.id from sessions s, participants p where s.id = p.session_id and p.participant_id = ?) " +
        "ORDER BY s.last_message_time DESC";

        ImDb.execQuery({
            sql: sql,
            args: [dateSpan * 3600 * 24, userId, userId],
            handler: handler || function (err, res) {
                if(err) log.error(err);
            }
        });
    }

    /**
     * 获取用户置顶会话
     *
     * @param userId
     * @param handler
     */
    static findStickySessions(userId, handler) {
        let sql = "select session_id from " + DB_TABLES.Participants + " w where w.participant_id = ? group by w.session_id";
        let sessionSQL = "select s.id,s.name,s.type,s.create_date from " + DB_TABLES.Sessions + " s," + DB_TABLES.StickySessions + " ss  where s.id = ss.session_id s.id in(" + sql + ")";
        ImDb.execQuery({
            "sql": sessionSQL,
            "args": [userId],
            "handler": handler || function (err, res) {
                if(err) log.error(err);
            }
        });
    }

    /**
     * 保存session。若会话重复创建，则更新会话名称。
     *
     * @param sessionId
     * @param name
     * @param type
     * @param createDate
     * @param businessType
     * @param handler
     */
    static saveSession(sessionId, name, type, createDate, businessType, handler) {
        let sql = "insert into " + DB_TABLES.Sessions + " (id, name, type, create_date,business_type) VALUES (?,?,?,?,?) " +
            "ON DUPLICATE KEY UPDATE name = ?";
        ImDb.execQuery({
            "sql": sql,
            "args": [sessionId, name, type, createDate, businessType, name],
            "handler": handler || function (err, res) {
                if(err) log.error(err);
            }
        });
    }

    /**
     * 更新会话的最终状态。
     *
     * @param lastSenderId
     * @param lastSenderName
     * @param lastMessageTime
     * @param lastContent
     * @param lastContentType
     * @param sessionId
     * @param handler
     */
    static updateSessionLastStatus(lastSenderId, lastSenderName, lastMessageTime, lastContent, lastContentType, sessionId, handler) {
        let sql = "update " + DB_TABLES.Sessions + " set last_sender_id=?,last_sender_name=?,last_message_time=?,last_content=?,last_content_type=? where id = ?";
        ImDb.execQuery({
            "sql": sql,
            "args": [lastSenderId, lastSenderName, lastMessageTime, lastContent, lastContentType, sessionId],
            "handler": handler || function (err, res) {
                if(err) log.error(err);
            }
        });
    }

    /**
     * 保存置顶会话。
     *
     * @param sessionId
     * @param user
     * @param score
     */
    static saveStickySession(sessionId, user, score) {
        let sql = "insert into " + DB_TABLES.StickySessions + " (user_id,session_id,score) VALUES (?,?,?) ";
        ImDb.execQuery({
            "sql": sql,
            "args": [user, sessionId, score],
            "handler": function (err, res) {
                if (err) {
                    log.error("sql:" + sql + "data:sessionId：" + sessionId + ",user：" + user + ",score：" + score);
                }
            }
        });
    }

    /**
     * 取消会话置顶。
     *
     * @param sessionId
     * @param userId
     */
    static unstickSession(sessionId, userId) {
        let sql = "delete from " + DB_TABLES.StickySessions + " where user_id=? and session_id=? ";
        ImDb.execQuery({
            "sql": sql,
            "args": [userId, sessionId],
            "handler": function (err, res) {
                if (err) {
                    log.error("sql:" + sql + "data:sessionId：" + sessionId + ",user：" + userId);
                }
            }
        });
    }
}

module.exports = SessionRepo;