import mongoose from 'mongoose'
import { MONGO_URI, MONGO_OPTIONS } from '../constants/index'

class Mongo {
  instance: typeof mongoose = mongoose
  mongoUri: string
  mongoOptions: mongoose.ConnectOptions
  isConnected: boolean

  constructor() {
    this.mongoUri = MONGO_URI
    this.mongoOptions = MONGO_OPTIONS
    this.isConnected = false
  }

  async connect() {
    if (this.isConnected) return

    try {
      console.log('⏳ Connecting to MongoDB')

      const db = await this.instance.connect(this.mongoUri, this.mongoOptions)
      const connection = db.connection

      this.isConnected = connection.readyState === 1
      if (this.isConnected) console.log('✅ MongoDB connected')

      connection.on('connected', () => console.log('✅ MongoDB connected')) // re-connected
      connection.on('disconnected', () => console.log('❌ MongoDB disconnected')) // disconnected
      connection.on('error', (error) => console.log('❌ MongoDB connection error', error)) // listen for errors during the session
    } catch (error: any) {
      console.log('❌ MongoDB connection error:', error.message)
    }
  }
}

export default new Mongo()