const fs = require('fs');
const path = require('path');
const Sequelize = require('sequelize');
const basename = path.basename(module.filename);
const logger = require('winston');
const config = require('../config/speechConfig.js');
const database = config.sql.database;
const username = config.sql.username;
const password = config.sql.password;
const db = {};

// set sequelize options
const sequelize = new Sequelize(database, username, password, {
  host          : 'localhost',
  dialect       : 'mysql',
  dialectOptions: {decimalNumbers: true}, // fix to ensure DECIMAL will not be stored as a string
  logging       : false,
  pool          : {
    max    : 5,
    min    : 0,
    idle   : 10000,
    acquire: 10000,
  },
});

sequelize
  .authenticate()
  .then(() => {
    logger.info('Sequelize has established mysql connection successfully.');
  })
  .catch(err => {
    logger.error('Sequelize was unable to connect to the database:', err);
  });

// add each model to the db object
fs
  .readdirSync(__dirname)
  .filter(file => {
    return (file.indexOf('.') !== 0 && file !== basename && file.slice(-3) === '.js');
  })
  .forEach(file => {
    const model = sequelize['import'](path.join(__dirname, file));
    db[model.name] = model;
  });

// run model.association for each model in the db object that has an association
Object.keys(db).forEach(modelName => {
  if (db[modelName].associate) {
    logger.info('Associating model:', modelName);
    db[modelName].associate(db);
  }
});

db.sequelize = sequelize;
db.Sequelize = Sequelize;

// add an 'upsert' method to the db object
db.upsert = (Model, values, condition, tableName) => {
  return Model
    .findOne({ where: condition })
    .then(obj => {
      if (obj) {  // update
        logger.debug(`updating record in db.${tableName}`);
        return obj.update(values);
      } else {  // insert
        logger.debug(`creating record in db.${tableName}`);
        return Model.create(values);
      }
    })
    .catch(function (error) {
      logger.error(`${tableName}.upsert error`, error);
      throw error;
    });
};

// add a 'getTrendingFiles' method to the db object.  note: change this to get claims directly.  might need new association between Request and Claim
db.getTrendingFiles = (startDate) => {
  return db.sequelize.query(`SELECT COUNT(*), File.* FROM Request LEFT JOIN File ON Request.FileId = File.id WHERE FileId IS NOT NULL AND nsfw != 1 AND trendingEligible = 1 AND Request.createdAt > "${startDate}" GROUP BY FileId ORDER BY COUNT(*) DESC LIMIT 25;`, { type: db.sequelize.QueryTypes.SELECT });
};

module.exports = db;