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/*
 *  Copyright 2010-2011 Benjamin Lings
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package net.codingwell

package object scalaguice {

  import com.google.inject._

  import java.lang.reflect.Type

  private def isArray[T](implicit m: Manifest[T]) = m.erasure.isArray

  private[scalaguice] def typeOf[T](implicit m: Manifest[T]): Type = {
    def toWrapper(c: Type) = c match {
      case java.lang.Byte.TYPE => classOf[java.lang.Byte]
      case java.lang.Short.TYPE => classOf[java.lang.Short]
      case java.lang.Character.TYPE => classOf[java.lang.Character]
      case java.lang.Integer.TYPE => classOf[java.lang.Integer]
      case java.lang.Long.TYPE => classOf[java.lang.Long]
      case java.lang.Float.TYPE => classOf[java.lang.Float]
      case java.lang.Double.TYPE => classOf[java.lang.Double]
      case java.lang.Boolean.TYPE => classOf[java.lang.Boolean]
      case java.lang.Void.TYPE => classOf[java.lang.Void]
      case cls => cls
    }

    if (isArray[T]) return m.erasure

    import com.google.inject.util.Types
    m.typeArguments match {
      case Nil => toWrapper(m.erasure)
      case args => m.erasure match {
        case c: Class[_] if c.getEnclosingClass == null => Types.newParameterizedType(c, args.map(typeOf(_)): _*)
        case c: Class[_] => Types.newParameterizedTypeWithOwner(c.getEnclosingClass, c, args.map(typeOf(_)): _*)
      }
    }
  }

  /**
   * Create a [[com.google.inject.TypeLiteral]] from a [[scala.Manifest]].
   * Subtypes of [[scala.AnyVal]] will be converted to their corresponding
   * Java wrapper classes.
   */
  def typeLiteral[T: Manifest]: TypeLiteral[T] = {
    TypeLiteral.get(typeOf[T]).asInstanceOf[TypeLiteral[T]]
  }

  def cls[T: Manifest] = manifest[T].erasure.asInstanceOf[Class[T]]
}