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package com.tsukaby.bean_validation_scala

import javax.validation.executable.ExecutableValidator
import javax.validation.metadata.BeanDescriptor
import javax.validation.{ConstraintViolation, Validation, Validator}

import org.hibernate.validator.internal.engine.ConfigurationImpl

import scala.collection.JavaConverters._

/**
 * ValidatorFactory for scala.
 */
object ScalaValidatorFactory {

  /**
   * Provide a ValidatorFactory with scala extensions.
   */
  lazy val validatorFactory = {
    val stream = getClass.getClassLoader.getResourceAsStream("scala-constraint-mapping.xml")

    val validatorFactory = Validation.byDefaultProvider().configure().addMapping(stream).asInstanceOf[ConfigurationImpl].buildValidatorFactory()

    validatorFactory
  }

  /**
   * Provide a Validator.
   */
  lazy val validator = {
    val v = validatorFactory.getValidator
    ScalaValidator(v)
  }

}

/**
 * Validator wrapper for scala.
 *
 * @param validator delegate.
 */
case class ScalaValidator(validator: Validator) {
  def validate[T](obj: T, groups: Class[_]*): Set[ConstraintViolation[T]] = {
    validator.validate(obj, groups: _*).asScala.toSet
  }

  def validateValue[T](beanType: Class[T], propertyName: String, value: scala.Any, groups: Class[_]*): Set[ConstraintViolation[T]] = {
    validator.validateValue(beanType, propertyName, value, groups: _*).asScala.toSet
  }

  def validateProperty[T](obj: T, propertyName: String, groups: Class[_]*): Set[ConstraintViolation[T]] = {
    validator.validateProperty(obj, propertyName, groups: _*).asScala.toSet
  }

  def unwrap[T](t: Class[T]): T = {
    validator.unwrap(t)
  }

  def forExecutables(): ExecutableValidator = {
    validator.forExecutables()
  }

  def getConstraintsForClass(clazz: Class[_]): BeanDescriptor = {
    validator.getConstraintsForClass(clazz)
  }
}