const User = require("../models/User");
const bcrypt = require("bcryptjs");  //is used for hashing/encrypting password.

let instance = null;

class createServices {

  constructor() {}
  
  static getInstance() {
    if (!instance) {
      instance = new createServices();
    }
    return instance;
  }

  
  async createSampleUser() {
    //Hash Password
    const salt = await bcrypt.genSalt(10); //generate hash of level 10 complexity or its no of hashing rounds
    const hashedPassword = await bcrypt.hash( "password@1", salt ); 
  
    const sampleRecord = new User({
      name: "sample user",
      email: "user@SampleApp.com",
      password: hashedPassword,
      isPublished: true,
    });

    //check if email is already in DB i.e should be unique
    const emailExist = await User.findOne( { email: sampleRecord.email } );
    if(!emailExist)
    {  
        try {
          const result = await sampleRecord.save();
          console.log("Your Database is created with a Sample User.");
          console.log(result);
        }
        catch (ex) {
          for (property in ex.errors) {
            console.log(ex.errors[property]);
          }
        }
    } 
  }