'use strict';

const joi = require('joi');
const { Sequelize, DataTypes, Op } = require('sequelize');

/**
 * Generate a validation schema using joi to check the type of your environment variables
 */
const envSchema = joi
  .object({
    DB_USER: joi.string(),
    DB_HOST: joi.string(),
    DB_PASSWORD: joi
      .string()
      .optional()
      .empty(''),
    DB_DATABASE: joi.string(),
    DB_PORT: joi.number(),
  })
  .unknown()
  .required();

/**
 * Validate the env variables using joi.validate()
 */
const { error, value: envVars } = joi.validate(process.env, envSchema);
if (error) {
  throw new Error(`Config validation error: ${error.message}`);
}

const config = {
  databaseConfig: {
    user: envVars.DB_USER,
    host: envVars.DB_HOST,
    password: envVars.DB_PASSWORD,
    database: envVars.DB_DATABASE,
    port: envVars.DB_PORT,
  },
};

const { databaseConfig } = config;

const DB = new Sequelize(databaseConfig.database, databaseConfig.user, databaseConfig.password, {
  host: databaseConfig.host,
  port: databaseConfig.port,
  dialect: 'mysql',
  // operatorsAliases: false,
  // operatorsAliases: 0,
  dialectOptions: {
    charset: 'utf8mb4',
    // collate: 'utf8mb4_unicode_ci',
    supportBigNumbers: true,
    bigNumberStrings: true,
  },

  pool: {
    max: 5,
    min: 0,
    acquire: 30000,
    idle: 10000,
  },
  timezone: '+08:00', // 东八时区
});

module.exports = {
  database: {
    DataTypes,
    Op,
    sequelize: DB,
  },
};