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/**
 * Copyright (c) 2010, 2011 10gen, Inc. 
 *
 * 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 com.mongodb.casbah.commons
package scalatest

import org.scalatest.matchers.Matcher
import org.scalatest.matchers.MatchResult

trait DBObjectMatchers {

  protected def someField(map: Option[DBObject], k: String) = if (k.indexOf('.') < 0) {
    map.getOrElse(MongoDBObject.empty).getAs[AnyRef](k)
  } else {
    map.getOrElse(MongoDBObject.empty).expand[AnyRef](k)
  }

  protected def field(map: DBObject, k: String) = if (k.indexOf('.') < 0) {
    map.getAs[AnyRef](k)
  } else {
    map.expand[AnyRef](k)
  }

  protected def listField(map: DBObject, k: String) = if (k.indexOf('.') < 0) {
    map.getAs[Seq[Any]](k)
  } else {
    map.expand[Seq[Any]](k)
  }

  val beDBObject = Matcher { left: AnyRef =>
    MatchResult(left.isInstanceOf[DBObject], left + " is a DBObject", left + " is not a DBObject")
  }

  def containSomeField(k: String) = Matcher { map: Option[DBObject] =>
    MatchResult(someField(map, k).isDefined, map.toString + " contains the key " + k, map.toString + " doesn't contain the key " + k)
  }

  /** matches if dbObject.contains(k) */
  def containField(k: String) = Matcher { map: DBObject =>
    MatchResult(field(map, k).isDefined, map.toString + " contains the key " + k, map.toString + " doesn't contain the key " + k)
  }

  /** matches if a Some(map) contains a pair (key, value) == (k, v)
   */
  def containSomeEntry[V](p: (String, V)) = Matcher { map: Option[DBObject] =>
    MatchResult(
      someField(map, p._1).exists(_ == p._2), // match only the value
      map.toString + " contain the pair " + p,
      map.toString + " doesn't contain the pair " + p
    )
  }

  /** Special version of "containEntry" that expects a list and then uses
   * "hasSameElements" on it.
   */
  def containListEntry(k: String, l: => Traversable[Any]) = Matcher { map: DBObject =>
    val objL = listField(map, k).getOrElse(Seq.empty[Any]).toSeq
    val _l = l.toSeq
    MatchResult(
      objL.sameElements(_l), // match only the value
      map.toString + " has the pair " + k,
      map.toString + " doesn't have the pair " + k
    )
  }

  /** matches if map contains a pair (key, value) == (k, v)
   */ // If a DBObject is a Map, can use contain already
  def containEntry[V](p: (String, V)) = Matcher { map: DBObject =>
    MatchResult(
      field(map, p._1).exists(_.equals(p._2)), // match only the value
      map.toString + " has the pair " + p,
      map.toString + "[" + field(map, p._1) + "] doesn't have the pair " + p + "[" + p._2 + "]"
    )
  }

  /** matches if Some(map) contains all the specified pairs
   * can expand dot notation to match specific sub-keys */
  def containSomeEntries[V](pairs: (String, V)*) = Matcher { map: Option[DBObject] =>
    MatchResult(
      pairs.forall(pair => someField(map, pair._1).exists(_ == pair._2) /* match only the value */ ),
      map.toString + " has the pairs " + pairs.mkString(", "),
      map.toString + " doesn't have the pairs " + pairs.mkString(", ")
    )
  }

  /** matches if map contains all the specified pairs
   * can expand dot notation to match specific sub-keys */
  def containEntries[V](pairs: (String, V)*) = Matcher { map: DBObject =>
    MatchResult(
      pairs.forall(pair => field(map, pair._1).exists(_ == pair._2) /* match only the value */ ),
      map.toString + " has the pairs " + pairs.mkString(", "),
      map.toString + " doesn't have the pairs " + pairs.mkString(", ")
    )
  }
}