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/*
 * Copyright 2007-2011 WorldWide Conferencing, LLC
 *
 * 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.liftweb
package builtin
package snippet

import scala.xml._
import net.liftweb.http._
import net.liftweb.util._
import net.liftweb.common._

import Helpers._

object Surround extends DispatchSnippet {

  def dispatch : DispatchIt = {
    case _ => render _
  }

  def render(kids: NodeSeq) : NodeSeq =
  (for {
    ctx <- S.session ?~ ("FIX"+"ME: Invalid session")
    req <- S.request ?~ ("FIX"+"ME: Invalid request")
  } yield {
    WithParamVar.doWith(Map()) {
      val mainParam = (S.attr("at") openOr "main", ctx.processSurroundAndInclude(PageName.get, kids))
        val paramsMap = WithParamVar.get + mainParam
      ctx.findAndMerge(S.attr("with"), paramsMap)
    }
  }) match {
    case Full(x) => x
    case Empty => Comment("FIX"+ "ME: session or request are invalid")
    case Failure(msg, _, _) => Comment(msg)
  }
}