const path = require('path');
const mysql = require('mysql');
const express = require('express');
const moment = require('moment-timezone');
const fs = require('fs');
const bodyParser = require('body-parser');

/* Database setup */

const dbPool = mysql.createPool({
  host: process.env.MYSQL_HOST || 'localhost',
  user: process.env.MYSQL_USER || 'root',
  password: process.env.MYSQL_PASSWORD || undefined,
  database: process.env.MYSQL_DATABASE || 'vizon',
  socketPath: process.env.MYSQL_SOCKET_PATH || undefined,
  timezone: process.env.TZ || 'local',

  debug: process.env.NODE_ENV === 'development',

});

const tableNames = {
  drawings: process.env.MYSQL_TABLE_DRAWINGS || 'vizon_drawings',
  users: process.env.MYSQL_TABLE_USERS || 'vizon_users',
  rankings: 'vizon_web_rankings',
};

/* Frontend server setup */

const frontendDir = path.resolve(__dirname, 'dist');

const app = express();

app.set('port', (process.env.PORT || 3000));

fs.stat(frontendDir, (err) => {
  if (!err) {
    console.log(`Serving static build from ${frontendDir}`);
    console.log('Run `npm run clean` to return to development mode');
    app.use('/', express.static(frontendDir));
  } else {
    console.log('Serving development build with nwb middleware');
    console.log('Run `npm run build` to create a production build');

    // eslint-disable-next-line import/no-extraneous-dependencies
    app.use(require('nwb/express')(express, {
      entry: 'src/index.jsx',
      reload: true,
    }));
  }
});

app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));

// Additional middleware which will set headers that we need on each request.
app.use((req, res, next) => {
  // Disable caching so we'll always get the latest comments.
  res.setHeader('Cache-Control', 'no-cache');
  next();
});

function calculateRankings(id: Number) {
  db.query('SELECT * FROM `vizon_web_rankings` WHERE `vizon_drawings_id`=?', [id], (err, results, fields) => {
    if (err) {
      console.error('Failed to query rankings from database:', err);
      res.status(500).json({
        error: 'Database query failed',
      });
    }
  });
}

app.get('/api/status', (req, res) => {
  dbPool.getConnection((err, db) => {
    if (err) {
      console.error('Failed to connect to database:', err);
      res.status(500).json({
        error: 'Database connection failed',
      });
    }

    db.query('SELECT * FROM ?? ORDER BY ?? DESC LIMIT 0, 1', [
      tableNames.drawings,
      'id',
    ], (qerr, results, fields) => {
      if (qerr) {
        console.error('Failed to request drawings:', err);
        res.status(500).json({
          error: 'Database query failed',
        });
        return;
      }

      const row = results[0];

      const id = row.id;

      const date = moment(row.drawing_date);

      const numbers = [
        row.first,
        row.second,
        row.third,
        row.fourth,
        row.fifth,
        row.sixth,
      ].map(i => parseInt(i, 10));

      const ranking = [
        // @TODO - calculate ranking from mysql tables {drawings} and {bets}
      ];

      res.json({
        lastDrawing: {
          id,
          date,
          numbers,
          ranking,
        },
      });
    });
  });
});

app.listen(app.get('port'), () => {
  console.log(`Server started: http://localhost:${app.get('port')}/`);
});