/* eslint-disable no-invalid-this */
/* eslint-disable func-names */
import mongoose from 'mongoose';
import uniqueValidator from 'mongoose-unique-validator';
import crypto from 'crypto';

const UserSchema = new mongoose.Schema(
    {
      username: {
        type: String,
        unique: true,
        required: [true, 'username-required'],
        match: [/^[a-zA-Z0-9]+$/, 'username-match'],
        index: true,
      },
      email: {
        type: String,
        lowercase: true,
        unique: true,
        required: [true, 'email-required'],
        match: [/\S+@\S+\.\S+/, 'email-match'],
        index: true,
      },
      hash: String,
      salt: String,
    },
    {timestamps: true},
);

UserSchema.plugin(uniqueValidator, {message: 'email-dup'});

UserSchema.methods.validPassword = function(password) {
  const [salt, key] = this.hash.split(':');

  return key === crypto.scryptSync(password, salt, 64).toString('hex');
};

UserSchema.pre('save', function(next) {
  const user = this;

  if (!user.isModified('salt')) {
    return next();
  }

  const salt = crypto.randomBytes(16).toString('hex');

  return crypto.scrypt(user.salt, salt, 64, (err, derivedKey) => {
    if (err) {
      next(err);
    }
    this.salt = salt;
    this.hash = `${salt}:${derivedKey.toString('hex')}`;

    next();
  });
});

export default mongoose.model('Users', UserSchema);