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/*
 * Copyright (c) 2011-13 Miles Sabin 
 *
 * 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 shapeless
package syntax

import scala.collection.generic.IsIterableLike

object sized {
  implicit def genTraversableSizedConv[CC[X], T](cc : CC[T])
    (implicit iil: IsIterableLike[CC[T]], ev : AdditiveCollection[CC[T]]) =
      new SizedConv[T, CC[T]](cc)
  
  implicit def stringSizedConv(s : String) = new SizedConv[Char, String](s)
}

final class SizedConv[A, Repr](r : Repr)(implicit iil: IsIterableLike[Repr], ev2: AdditiveCollection[Repr]) {
  import ops.nat._
  import Sized._

  def sized[L <: Nat](implicit toInt : ToInt[L]) =
    if(iil.conversion(r).size == toInt()) Some(wrap[Repr, L](r)) else None
    
  def sized(l: Nat)(implicit toInt : ToInt[l.N]) =
    if(iil.conversion(r).size == toInt()) Some(wrap[Repr, l.N](r)) else None
    
  def ensureSized[L <: Nat](implicit toInt : ToInt[L]) = {
    assert(iil.conversion(r).size == toInt())
    wrap[Repr, L](r)
  }
}