const MongoClient = require('mongodb').MongoClient;
const configService = require('./server-config-service');

function randint(max) {
  return Math.round(Math.random() * max);
}

function randomstring() {
  const letters = 'ABCDEFHIJKLMNOPQRSTUVWXYZ';
  let result = '';
  for (let i = 0; i < 10; i++) {
    let index = randint(letters.length - 1);
    result += letters[index];
  }
  return result;
}

let mongoClient;

async function start() {
  mongoClient = await MongoClient.connect('mongodb://localhost:27017', { useNewUrlParser: true });
  const db = mongoClient.db('my-cool-bot-db');
  await configService.initialize(db.collection('server-configs'));

  console.log(`Channel Id For Server A Before Set: ${await configService.get('A', 'channel-id')}`);
  console.log(`Channel Id For Server B Before Set: ${await configService.get('B', 'channel-id')}`);

  await configService.set('A', 'channel-id', randomstring());
  await configService.set('B', 'channel-id', randomstring());

  console.log(`Channel Id For Server A Before Set: ${await configService.get('A', 'channel-id')}`);
  console.log(`Channel Id For Server B Before Set: ${await configService.get('B', 'channel-id')}`);
}

start().then(() => {
  mongoClient.close().catch(err => {
    console.log('Error closing database: ' + err);
  });
}).catch(err => {
  console.log('Error running demo: ' + err);
  mongoClient.close().catch(err => {
    console.log('Error closing database: ' + err);
  });
});