import mongoose from 'mongoose';
import bcrypt from 'bcrypt';
require('dotenv').config();

const { SALT_WORK_FACTOR } = process.env;

const { Schema } = mongoose;
const UserSchema = new Schema({
    username: { type: String, required: true, index: { unique: true } },
    password: { type: String, required: true }
});


UserSchema.pre('save', next => {
    var user = this;
    // only hash the password if it has been modified (or is new)
    if (!user.isModified('password')) return next();
    
    // generate a salt
    bcrypt.genSalt(SALT_WORK_FACTOR, function(err, salt) {
        if (err) return next(err);
    
        // hash the password along with our new salt
        bcrypt.hash(user.password, salt, function(err, hash) {
            if (err) return next(err);
    
            // override the cleartext password with the hashed one
            user.password = hash;
            next();
        });
    });
});

UserSchema.methods.comparePassword = (candidatePassword, cb) => {
    bcrypt.compare(candidatePassword, this.password, function(err, isMatch) {
        if (err) return cb(err);
        cb(null, isMatch);
    });
};

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