var mongoose = require('mongoose'),
    Schema = mongoose.Schema,
    bcrypt = require('bcryptjs'),
    SALT_WORK_FACTOR = 10

var UserSchema = new Schema({
    username: { type: String, required: true, index: { unique: true } },
    password: { type: String, required: true },
    admin: {type: Boolean, default: false}
})


UserSchema.pre('save', function(next) {
    var user = this
    if (!user.isModified('password')) return next()
    bcrypt.genSalt(SALT_WORK_FACTOR, function(err, salt) {
        if (err) return next(err)
        bcrypt.hash(user.password, salt, function(err, hash) {
            if (err) return next(err)
            user.password = hash
            next()
        })
    })
})

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

module.exports = mongoose.model('User', UserSchema)