const crypto = require('crypto');
const uModel = require('./models/users')
class _Crypto
{
    constructor(User, Password)
    {
        this.salt = 'H$44Q3RVCd9X8Ef63tB4';
        this.secret = 'mYFUZX9NSx7K74r7Jh@O';
        this.pepper = String.fromCharCode(this.getRandomInt(65, 90));
        this.password = Password;
        this.user = User;
        this.algorithm = 'aes-192-cbc';

    }
    get Hash() // to use on register
    {
        return this.hash()
    }
    hash(p)
    {
        return crypto.createHmac('sha256', this.secret).update(this.user+this.password+this.salt + (p?p:this.pepper) ).digest('hex');  
    }
    eHash(Email)
    {
        Email = Email?Email:this.user
        return this.user? new Buffer.from(this.user).toString('base64') :new Buffer.from(Email).toString('base64');
    }
  
    decrypt(eHash)
    {
      return new Buffer.from(eHash, 'base64').toString('utf8');
    }
    getRandomInt(min, max)
    {
        min = Math.ceil(min);
        max = Math.floor(max);
        return Math.floor(Math.random() * (max - min)) + min;
    }
    //TODO: compare() 
    //Get hash from db run through the peper possibilties and see if there is a match.
    //return hash if true, null if false
    async bouncer()
    {
        var Users = await uModel.find()
        if(Users.length===0) return 
        var response;
        for(var i = 65; i < 91; i++)
        {
            // eslint-disable-next-line no-loop-func
            ((i)=>{
                var auxHash = this.hash(String.fromCharCode(i))
                var auxUsers = Users.filter(x=>x.Hash === auxHash)
                if(auxUsers.length === 1) return response = auxHash;
            })(i)
        }
        return response;

    }
    async isNew(eHash)
    {
        var User = await uModel.find({eHash});
        return !(User.length>0);
    }


}module.exports._Crypto = _Crypto;