'use strict';

let ImDb = require('../mysql/db/im.db');
let async = require("async");
let ObjectUtil = require("../../util/object.util.js");
let vsprintf = require("sprintf-js").vsprintf;

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

class SearchRepo {
    constructor() {
    }

    /**
     * 查询正常会话及议题已结束的会话(P2P, MUC)
     *
     * @param userId
     * @param handler
     */
    static findTopicEndedSessionIdList(userId, handler) {
        let sql = "SELECT s.id " +
            "FROM sessions s, topics t, participants p " +
            "WHERE p.participant_id = ? AND p.session_id = s.id AND s.id = t.session_id AND t.end_message_id IS NOT NULL AND s.`type` IN (1) " +
            " UNION " +
            "SELECT s.id " +
            "FROM sessions s, participants p " +
            "WHERE p.participant_id = ? AND p.session_id = s.id AND s.`type` IN (2, 3)";

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

    /**
     * 全部搜索
     *
     * @param sessionIdList
     * @param keyword
     * @param userTable
     * @param handler
     */
    static searchAll(sessionIdList, keyword, userTable, handler) {
        let data = {};

        async.waterfall([
            function (callback) {
                SearchRepo.searchUser(sessionIdList, keyword, userTable, 0, 3, function (err, res) {
                    if (err) return handler(err, null);

                    let buffer = SearchRepo.userForge(res);
                    userTable == DB_TABLES.Doctors ? data.doctors = buffer : data.patients = buffer;

                    callback(null);
                });
            },
            function (callback) {
                SearchRepo.searchSessions(sessionIdList, keyword, userTable, 0, 3, function (err, res) {
                    if (err) return handler(err, null);

                    data.sessions = SearchRepo.sessionForge(res);

                    callback(null);
                })
            },
            function (callback) {
                SearchRepo.searchMessages(sessionIdList, keyword, 0, 3, function (err, res) {
                    if (err) return handler(err, null);

                    data.messages = SearchRepo.messageForge(res);

                    handler(null, data);
                })
            }
        ]);
    }

    /**
     * 用户搜索
     *
     * @param sessionIdList
     * @param keyword
     * @param userTable
     * @param page
     * @param size
     * @param handler
     */
    static searchUser(sessionIdList, keyword, userTable, page, size, handler) {
        let sql = "SELECT DISTINCT u.id, u.name, u.sex, u.birthdate, u.avatar %s FROM sessions s, participants p, " + userTable +
            " u WHERE s.id in (?) AND s.id = p.session_id AND p.participant_id = u.id AND u.name like ? limit ?, ?";

        sql = vsprintf(sql, [userTable == DB_TABLES.Doctors ? ', hospital_name' : '']);

        keyword = '%' + keyword + '%';
        ImDb.execQuery({
            sql: sql,
            args: [sessionIdList, keyword, page * size, size],
            handler: handler
        });
    }

    /**
     * 会话搜索。搜索会话名称与会话成员的名称。若有一个符合，就选中。
     */
    static searchSessions(sessionIdList, keyword, userTable, page, size, handler) {
        if (sessionIdList.length == 0) {
            return handler(null, []);
        }

        let sql = "SELECT s.id, s.name, s.type, s.create_date, s.business_type, u.name participant_name " +
            "FROM sessions s, participants p, " + userTable + " u " +
            "WHERE s.id IN (?) AND s.id = p.session_id AND p.participant_id = u.id AND (s.name LIKE ? or u.name like ?) " +
            "GROUP by s.id LIMIT ?, ?";

        keyword = '%' + keyword + '%';
        ImDb.execQuery({
            sql: sql,
            args: [sessionIdList, keyword, keyword, page * size, size],
            handler: handler
        });
    }

    /**
     * 消息搜索
     */
    static searchMessages(sessionIdList, keyword, page, size, handler) {
        let sql = "SELECT * FROM(" +
            "SELECT s.id session_id, s.name session_name, s.type session_type, s.business_type session_business_type, m.id message_id, m.sender_id, m.sender_name, m.timestamp, m.content " +
            "FROM sessions s, muc_messages m " +
            "WHERE s.id IN (?) AND s.id = m.session_id AND s.`type` = 1 AND m.content_type = 1 AND m.content LIKE ? " +
            " UNION " +
            "SELECT s.id session_id, s.name session_name, s.type session_type, s.business_type session_business_type, m.id message_id, m.sender_id, m.sender_name, m.timestamp, m.content " +
            "FROM sessions s, p2p_messages m " +
            "WHERE s.id IN (?) AND s.id = m.session_id AND s.`type` = 2 AND m.content_type = 1 AND m.content LIKE ? " +
            " UNION " +
            "SELECT s.id session_id, s.name session_name, s.type session_type, s.business_type session_business_type, m.id message_id, m.sender_id, m.sender_name, m.timestamp, m.content " +
            "FROM sessions s, group_messages m " +
            "WHERE s.id IN (?) AND s.id = m.session_id AND s.`type` = 3 AND m.content_type = 1 AND m.content LIKE ? ) X " +
            "ORDER BY X.session_id, X.message_id LIMIT ?, ?";

        keyword = '%' + keyword + '%';
        ImDb.execQuery({
            sql: sql,
            args: [sessionIdList, keyword, sessionIdList, keyword, sessionIdList, keyword, page * size, size],
            handler: handler
        });
    }

    static userForge(res) {
        res.forEach(function (user) {
            if (!user.avatar) user.avatar = "";

            user.birthdate = user.birthdate ? ObjectUtil.timestampToLong(user.birthdate) : "";
        });

        return res;
    }

    static sessionForge(res) {
        res.forEach(function (session) {
            session.create_date = ObjectUtil.timestampToLong(session.timestamp);
        });

        return res;
    }

    static messageForge(res) {
        let result = [];

        let lastSessionId = null;
        let session = null;
        res.forEach(function (message) {
            if (message.session_id !== lastSessionId) {
                lastSessionId = message.session_id;
                session = {
                    session_id: message.session_id,
                    session_name: message.session_name,
                    session_type: message.session_type,
                    session_business_type: message.session_business_type,
                    messages: []
                };

                result.push(session);
            }

            session.messages.push({
                id: message.message_id,
                sender_id: message.sender_id,
                sender_name: message.sender_name,
                timestamp: ObjectUtil.timestampToLong(message.timestamp),
                content: message.content
            });
        });

        return result;
    }
}

module.exports = SearchRepo;