const express = require('express');
const app = express();
const mysql = require('mysql2/promise');
const axios = require('axios').default;
const bodyParser = require('body-parser');

app.use(bodyParser.json());

const channelToken = 'Bearer ZVI571ynUAVT0U44734ziyjVtStYiUi2UA4txCgVUvugv5YQwToMDgE991Sd4UbsZtJpBhXEtQKX/YkvQVx0PgH9F7qy75eUR0iKMwz33RXD5BG8JuFZ67FqR/GXZQNSk+kXHMBVnCQPeeNqTNn5MgdB04t89/1O/w1cDnyilFU=';

const pool = mysql.createPool({
    host: 'localhost',
    user: 'root',
    password: '0712',
    database: 'tft'
});

app.post('/messages', function(req, res) {
    for(let event of req.body.events) {
        if(event.type == 'message')
            onMessage(event.message, event.replyToken);
    }

    res.sendStatus(200);
});

function onMessage(message, replyToken) {
    if(message.type != 'text')
        return;
    
    if(message.text.indexOf('아이템') >= 0) {
        recommendItem(message.text.split(' ')[0], replyToken);
        return;
    }
    
    let keywords = [
        '추천덱',
        '추천메타',
        '덱추천',
        '메타추천',
        '메타덱',
        '추천시너지',
        '메타시너지',
        '시너지추천'
    ];

    let isMeta = false;
    let textOnly = message.text.replace(' ', '');
    for(let k of keywords) {
        if(textOnly.indexOf(k) >= 0)
            isMeta = true;
    }
    if(isMeta) {
        recommendMeta(replyToken);
        return;
    }

    replyMessage(replyToken, [{type: 'text', text: '수행할 수 없는 명령입니다.'}]);
}

function recommendItem(charAlias, replyToken) {
    let sql = 'SELECT n.`alias`, i.`name` FROM `character_aliases` a JOIN `character_items` c ON a.`character_id`=c.`character_id` JOIN `character_aliases` n ON c.`character_id`=n.`character_id` JOIN `items` i ON c.`item`=i.`id` WHERE a.`alias`=? AND n.`is_name`=1 ORDER BY c.`count` DESC LIMIT 0,5';
    pool.query(sql, [charAlias]).then(function([results]) {
        let reply;
        if(results.length == 0)
            reply = '데이터가 없습니다.';
        else
            reply = `${results[0].alias}의 추천 아이템은 ${results.map(e => e.name).join(', ')} 입니다.`;

        replyMessage(replyToken, [{type: 'text', text: reply}]);
    });
}

async function recommendMeta(replyToken) {
    let sql = 'SELECT * FROM decks ORDER BY `count` DESC LIMIT 0,3';
    let [results] = await pool.query(sql);
    let messages = [];

    for(let row of results) {
        let chars = [];
        sql = 'SELECT `alias` FROM character_aliases WHERE character_id=? AND is_name=1';
        for(let i = 1; i <= 8; i++) {
            [results] = await pool.query(sql, [row[`character_${i}`]]);
            chars.push(results[0].alias);
        }
    
        let traitCnt = new Map();
        traitCnt.set(row.chosen, 1);

        let checked = new Set();
    
        sql = 'SELECT trait FROM character_traits WHERE character_id=?';
        for(let i = 0; i <= 8; i++) {
            if(checked.has(row[`character_${i}`]))
                continue;

            [results] = await pool.query(sql, [row[`character_${i}`]]);
    
            for(let t of results) {
                if(traitCnt.has(t.trait))
                    traitCnt.set(t.trait, traitCnt.get(t.trait) + 1);
                else
                    traitCnt.set(t.trait, 1);
            }

            checked.add(row[`character_${i}`]);
        }
    
        let traits = [];
        sql = 'SELECT t.name, l.count FROM traits t JOIN trait_levels l ON t.id=l.trait_id WHERE t.id=? AND l.count <= ? ORDER BY l.count DESC LIMIT 1';
        for(let [key, value] of traitCnt.entries()) {
            [results] = await pool.query(sql, [key, value]);
            if(results.length == 0)
                continue;

            traits.push(`${results[0].count}${results[0].name}`);
        };

        [results] = await pool.query('SELECT `name` FROM traits WHERE `id`=?', [row.chosen]);
        messages.push({
            type: 'text',
            text: traits.join(', ') + '\n' + chars.join(', ') + '\n' + '선택받은 자: ' + results[0].name
        });
    }

    replyMessage(replyToken, messages);
}

function replyMessage(replyToken, messages) {
    axios.post('https://api.line.me/v2/bot/message/reply', {
        replyToken: replyToken,
        messages: messages
    }, {
        headers: {'Authorization': channelToken}
    });
}

app.listen(3000, () => console.log('TFT Chatbot started'));