/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 org.apache.daffodil.dsom

import java.math.BigInteger
import scala.xml.Node
import org.apache.daffodil.exceptions.Assert
import org.apache.daffodil.dpath.NodeInfo.PrimType

trait Facets { self: Restriction =>
  import org.apache.daffodil.dsom.FacetTypes._

  requiredEvaluations(if (hasPattern) patternValues)
  requiredEvaluations(if (hasEnumeration) enumerationValues)
  requiredEvaluations(if (hasMinLength) minLengthValue)
  requiredEvaluations(if (hasMaxLength) maxLengthValue)
  requiredEvaluations(if (hasMinInclusive) minInclusiveValue)
  requiredEvaluations(if (hasMaxInclusive) maxInclusiveValue)
  requiredEvaluations(if (hasMinExclusive) minExclusiveValue)
  requiredEvaluations(if (hasMaxExclusive) maxExclusiveValue)
  requiredEvaluations(if (hasTotalDigits) totalDigitsValue)
  requiredEvaluations(if (hasFractionDigits) fractionDigitsValue)

  private def retrieveFacetValueFromRestrictionBase(xml: Node, facetName: Facet.Type): String = {
    val res = xml \\ "restriction" \ facetName.toString() \ "@value"
    if (res.length > 0) res.head.text else ""
  }

  private def retrieveFacetValuesFromRestrictionBase(xml: Node, facetName: Facet.Type): Seq[String] = {
    val res = xml \\ "restriction" \ facetName.toString() \\ "@value"
    if (res.length > 0) res.map(n => n.text).toList else List.empty
  }
  private def enumeration(xml: Node): Seq[String] = { retrieveFacetValuesFromRestrictionBase(xml, Facet.enumeration) }
  private def fractionDigits(xml: Node): String = { retrieveFacetValueFromRestrictionBase(xml, Facet.fractionDigits) }
  private def maxExclusive(xml: Node): String = { retrieveFacetValueFromRestrictionBase(xml, Facet.maxExclusive) }
  private def maxInclusive(xml: Node): String = { retrieveFacetValueFromRestrictionBase(xml, Facet.maxInclusive) }
  private def maxLength(xml: Node): String = { retrieveFacetValueFromRestrictionBase(xml, Facet.maxLength) }
  private def minExclusive(xml: Node): String = { retrieveFacetValueFromRestrictionBase(xml, Facet.minExclusive) }
  private def minInclusive(xml: Node): String = { retrieveFacetValueFromRestrictionBase(xml, Facet.minInclusive) }
  private def minLength(xml: Node): String = { retrieveFacetValueFromRestrictionBase(xml, Facet.minLength) }
  private def pattern(xml: Node): Seq[String] = {
    // Patterns are OR'd locally, AND'd remotely
    retrieveFacetValuesFromRestrictionBase(xml, Facet.pattern).map(p => p)
  }
  private def totalDigits(xml: Node): String = { retrieveFacetValueFromRestrictionBase(xml, Facet.totalDigits) }
  private def whitespace(xml: Node): String = { retrieveFacetValueFromRestrictionBase(xml, Facet.whiteSpace) }

  final lazy val localPatternValue: String = {
    // Patterns within a type are OR'd
    // per http://www.xfront.com/XML-Schema-library/papers/Algorithm-for-Merging-a-simpleType-Dependency-Chain.pdf
    //
    // Assumed to be valid RegEx
    val patterns = pattern(xml)
    patterns.mkString("|")
  }
  final lazy val localMinInclusiveValue: String = minInclusive(xml)
  final lazy val localMaxInclusiveValue: String = maxInclusive(xml)
  final lazy val localMinExclusiveValue: String = minExclusive(xml)
  final lazy val localMaxExclusiveValue: String = maxExclusive(xml)
  final lazy val localMinLengthValue: String = minLength(xml)
  final lazy val localMaxLengthValue: String = maxLength(xml)
  final lazy val localTotalDigitsValue: String = totalDigits(xml)
  final lazy val localFractionDigitsValue: String = fractionDigits(xml)
  final lazy val localEnumerationValue: String = {
    // Enumerations are OR'd
    // May be empty string
    // Must be unique
    val enumerations = enumeration(xml)
    val distinctEnums = enumerations.distinct
    if (enumerations.size != distinctEnums.size) context.SDE("Enumerations must be unique!")
    // Not a regular expression, but we plan to use it as one
    // so we must escape characters that can be interpreted as RegEx
    enumerations.map(s => escapeForRegex(s)).mkString("|")
  }
  final lazy val localWhitespaceValue: String = {
    whitespace(xml)
    context.SDE("whitespaceValue is not implemented for DFDL v1.0 schemas but reserved for future use.")
  }

  private def escapeForRegex(s: String): String = {
    val sb = new StringBuilder
    s.foreach(c => {
      c match {
        case '[' => sb.append("\\[")
        case '\\' => sb.append("\\\\")
        case '^' => sb.append("\\^")
        case '$' => sb.append("\\$")
        case '.' => sb.append("\\.")
        case '|' => sb.append("\\|")
        case '?' => sb.append("\\?")
        case '*' => sb.append("\\*")
        case '+' => sb.append("\\+")
        case '(' => sb.append("\\(")
        case ')' => sb.append("\\)")
        case '{' => sb.append("\\{")
        case '}' => sb.append("\\}")
        case x => sb.append(x)
      }
    })
    sb.toString()
  }

  final lazy val hasEnumeration: Boolean = (localEnumerationValue.length > 0) || (getRemoteFacetValues(Facet.enumeration).size > 0)
  final lazy val hasPattern: Boolean = (localPatternValue.length > 0) || (getRemoteFacetValues(Facet.pattern).size > 0)
  final lazy val hasMinLength: Boolean = (localMinLengthValue != "") || (getRemoteFacetValues(Facet.minLength).size > 0)
  final lazy val hasMaxLength: Boolean = (localMaxLengthValue != "") || (getRemoteFacetValues(Facet.maxLength).size > 0)
  final lazy val hasMinInclusive: Boolean = (localMinInclusiveValue != "") || (getRemoteFacetValues(Facet.minInclusive).size > 0)
  final lazy val hasMaxInclusive: Boolean = (localMaxInclusiveValue != "") || (getRemoteFacetValues(Facet.maxInclusive).size > 0)
  final lazy val hasMinExclusive: Boolean = (localMinExclusiveValue != "") || (getRemoteFacetValues(Facet.minExclusive).size > 0)
  final lazy val hasMaxExclusive: Boolean = (localMaxExclusiveValue != "") || (getRemoteFacetValues(Facet.maxExclusive).size > 0)
  final lazy val hasTotalDigits: Boolean = (localTotalDigitsValue != "") || (getRemoteFacetValues(Facet.totalDigits).size > 0)
  final lazy val hasFractionDigits: Boolean = (localFractionDigitsValue != "") || (getRemoteFacetValues(Facet.fractionDigits).size > 0)

  final lazy val patternValues: Seq[FacetValueR] = {
    val values = combinedBaseFacets.filter { case (f, _) => f == Facet.pattern }
    if (values.size > 0) {
      val res: Seq[FacetValueR] = values.map { case (f, v) => (f, v.r) }
      res
    } else Seq.empty
  }
  final lazy val enumerationValues: Option[String] = {
    // Should only ever have one set per SimpleType
    val values = combinedBaseFacets.filter { case (f, _) => f == Facet.enumeration }
    if (values.size > 0) {
      val (_, value) = values(0)
      Some(value)
    } else None // context.SDE("Enumeration was not found in this context.")
  }
  // TODO: Tidy up.  Can likely replace getFacetValue with a similar call to combinedBaseFacets
  // as combinedBaseFacets should contain the 'narrowed' values.
  //
  final lazy val minLengthValue: java.math.BigDecimal = getFacetValue(localMinLengthValue, Facet.minLength, hasMinLength)
  final lazy val maxLengthValue: java.math.BigDecimal = getFacetValue(localMaxLengthValue, Facet.maxLength, hasMaxLength)
  final lazy val minInclusiveValue: java.math.BigDecimal = getFacetValue(localMinInclusiveValue, Facet.minInclusive, hasMinInclusive)
  final lazy val maxInclusiveValue: java.math.BigDecimal = getFacetValue(localMaxInclusiveValue, Facet.maxInclusive, hasMaxInclusive)
  final lazy val minExclusiveValue: java.math.BigDecimal = getFacetValue(localMinExclusiveValue, Facet.minExclusive, hasMinExclusive)
  final lazy val maxExclusiveValue: java.math.BigDecimal = getFacetValue(localMaxExclusiveValue, Facet.maxExclusive, hasMaxExclusive)
  final lazy val totalDigitsValue: java.math.BigDecimal = getFacetValue(localTotalDigitsValue, Facet.totalDigits, hasTotalDigits)
  final lazy val fractionDigitsValue: java.math.BigDecimal = getFacetValue(localFractionDigitsValue, Facet.fractionDigits, hasFractionDigits)

  //  private def errorOnLocalLessThanBaseFacet(local: Long, base: Long, theFacetType: Facet.Type) = {
  //    if (local < base) context.SDE("SimpleTypes: The local %s (%s) was less than the base %s (%s) ", theFacetType, local, theFacetType, base)
  //  }
  //  private def errorOnLocalGreaterThanBaseFacet(local: Long, base: Long, theFacetType: Facet.Type) = {
  //    if (local > base) context.SDE("SimpleTypes: The local %s (%s) was greater than the base %s (%s) ", theFacetType, local, theFacetType, base)
  //  }
  private def errorOnLocalLessThanBaseFacet(local: BigInteger,
    base: BigInteger, theFacetType: Facet.Type) = {
    val res = local.compareTo(base)
    if (res < 0) context.SDE("SimpleTypes: The local %s (%s) was less than the base %s (%s) ",
      theFacetType, local, theFacetType, base)
  }
  private def errorOnLocalGreaterThanBaseFacet(local: BigInteger,
    base: BigInteger, theFacetType: Facet.Type) = {
    val res = local.compareTo(base)
    if (res > 0) context.SDE("SimpleTypes: The local %s (%s) was greater than the base %s (%s) ",
      theFacetType, local, theFacetType, base)
  }
  private def errorOnLocalLessThanBaseFacet(local: java.math.BigDecimal,
    base: java.math.BigDecimal, theFacetType: Facet.Type) = {
    val res = local.compareTo(base)
    if (res < 0) context.SDE("SimpleTypes: The local %s (%s) was less than the base %s (%s) ",
      theFacetType, local, theFacetType, base)
  }
  private def errorOnLocalGreaterThanBaseFacet(local: java.math.BigDecimal,
    base: java.math.BigDecimal, theFacetType: Facet.Type) = {
    val res = local.compareTo(base)
    if (res > 0) context.SDE("SimpleTypes: The local %s (%s) was greater than the base %s (%s) ",
      theFacetType, local, theFacetType, base)
  }

  //  private def getRemoteFacets(theFacetType: Facet.Type): Seq[FacetValueR] = {
  //    val remoteValues = remoteBaseFacets.filter { case (f, _) => f == theFacetType }
  //    if (remoteValues.size > 0) {
  //      val res: Seq[FacetValueR] = remoteValues.map { case (f, v) => (f, v.r) }
  //      res
  //    } else Seq.empty
  //  }

  private def getRemoteFacetValues(theFacetType: Facet.Type): Seq[FacetValue] = {
    val res = remoteBaseFacets.filter { case (f, _) => f == theFacetType }
    res
  }

  private def getRemoteFacetValue(theFacetType: Facet.Type): String = {
    // Filtering works more appropriately here
    val res = remoteBaseFacets.filter { case (f, v) => f == theFacetType }
    if (res.size > 0) {
      val (_, theFacetValue) = res(0)
      return theFacetValue
    }
    "" // Indicates the facet doesn't exist
  }

  private def getFacetValue(theLocalValue: String, theRemoteValue: String, theType: Facet.Type, exists: Boolean): java.math.BigDecimal = {
    if (!exists) context.SDE("The facet %s was not found.", theType)
    else if (theLocalValue != "" && theRemoteValue != "") {
      val resFacet = doNumericFacetNarrowing(theLocalValue, theRemoteValue, theType)
      new java.math.BigDecimal(resFacet)
    } else if (theLocalValue != "") {
      checkValueSpaceFacetRange(theLocalValue, theType)
    } else {
      checkValueSpaceFacetRange(theRemoteValue, theType)
    }
  }

  private def getFacetValue(theLocalValue: String, theType: Facet.Type, exists: Boolean): java.math.BigDecimal = {
    val remoteFacets = getRemoteFacetValues(theType)
    if (!exists) context.SDE("The facet %s was not found.", theType)
    else if (theLocalValue != "" && remoteFacets.size > 0) {
      val (_, remoteValue) = getRemoteFacetValues(theType)(0)
      val resFacet = doNumericFacetNarrowing(theLocalValue, remoteValue, theType)
      new java.math.BigDecimal(resFacet)
    } else if (theLocalValue != "") {
      checkValueSpaceFacetRange(theLocalValue, theType)
    } else {
      val (_, remoteValue) = remoteFacets(0)
      checkValueSpaceFacetRange(remoteValue, theType)
    }
  }

  private def narrowNonNegativeFacets(localFacet: String, remoteFacet: String, facetType: Facet.Type): String = {
    val theLocalFacet = new BigInteger(localFacet)
    val theRemoteFacet = new BigInteger(remoteFacet)
    if (theLocalFacet.signum() != 1) context.SDE("The %s facet must be a non-negative integer.", facetType)
    facetType match {
      case Facet.minLength => {
        errorOnLocalLessThanBaseFacet(theLocalFacet, theRemoteFacet, facetType)
        localFacet
      }
      case Facet.maxLength | Facet.fractionDigits => {
        errorOnLocalGreaterThanBaseFacet(theLocalFacet, theRemoteFacet, facetType)
        localFacet
      }
      case _ => {
        val errMsg = "narrowNonNegativeFacets is not valid for %s facet".format(facetType)
        Assert.usageError(errMsg)
      }
    }
  }

  private def narrowPositiveIntegerFacets(localFacet: String, remoteFacet: String, facetType: Facet.Type): String = {
    val theLocalFacet = new BigInteger(localFacet)
    val theRemoteFacet = new BigInteger(remoteFacet)
    if ((theLocalFacet.signum() != 1) || (theLocalFacet.compareTo(BigInteger.ZERO) == 0)) context.SDE("The %s facet must be a positive integer.", facetType)
    facetType match {
      case Facet.totalDigits => {
        errorOnLocalGreaterThanBaseFacet(theLocalFacet, theRemoteFacet, facetType)
        localFacet
      }
      case _ => {
        val errMsg = "narrowPositiveIntegerFacets is not valid for %s facet".format(facetType)
        Assert.usageError(errMsg)
      }
    }
  }

  private def narrowValueSpaceFacets(localFacet: String, remoteFacet: String, facetType: Facet.Type) = {
    val (theLocalFacet, theRemoteFacet) = checkValueSpaceFacetRange(localFacet, remoteFacet, facetType)

    // Made it here so range checks were successful
    // Now just validate/compare local and base/remote facet
    facetType match {
      case Facet.minInclusive => { errorOnLocalLessThanBaseFacet(theLocalFacet, theRemoteFacet, facetType) }
      case Facet.maxInclusive => { errorOnLocalGreaterThanBaseFacet(theLocalFacet, theRemoteFacet, facetType) }
      case Facet.minExclusive => { errorOnLocalLessThanBaseFacet(theLocalFacet, theRemoteFacet, facetType) }
      case Facet.maxExclusive => { errorOnLocalGreaterThanBaseFacet(theLocalFacet, theRemoteFacet, facetType) }
      case _ => {
        val errMsg = "Unrecognized facet type (%s) for narrowing of value-space facets.".format(facetType)
        Assert.usageError(errMsg)
      }
    }
    localFacet
  }

  private def convertFacetToBigDecimal(facet: String): java.math.BigDecimal = {
    self.primType match {
      case PrimType.DateTime => dateToBigDecimal(facet, "uuuu-MM-dd'T'HH:mm:ss.SSSSSSxxx", PrimType.DateTime.toString(), context)
      case PrimType.Date => dateToBigDecimal(facet, "uuuu-MM-ddxxx", PrimType.Date.toString(), context)
      case PrimType.Time => dateToBigDecimal(facet, "HH:mm:ss.SSSSSSxxx", PrimType.Time.toString(), context)
      case _ => new java.math.BigDecimal(facet)
    }
  }

  private def checkValueSpaceFacetRange(localFacet: String, facetType: Facet.Type): java.math.BigDecimal = {
    // Necessary for min/max Inclusive/Exclusive Facets

    // Perform conversions once
    //val theLocalFacet = new java.math.BigDecimal(localFacet)
    val theLocalFacet = convertFacetToBigDecimal(localFacet)

    facetType match {
      case Facet.maxExclusive | Facet.maxInclusive |
        Facet.minExclusive | Facet.minInclusive | Facet.enumeration => {
        // Here we're just doing range checking for the
        // specified primitive type
        primType match {
          case PrimType.Int => {
            if (!isFacetInIntRange(theLocalFacet)) {
              context.SDE("%s facet value (%s) was found to be outside of Int range.",
                facetType, localFacet)
            }
          }
          case PrimType.Byte => {
            if (!isFacetInByteRange(theLocalFacet)) {
              context.SDE("%s facet value (%s) was found to be outside of Byte range.",
                facetType, localFacet)
            }
          }
          case PrimType.Short => {
            if (!isFacetInShortRange(theLocalFacet)) {
              context.SDE("%s facet value (%s) was found to be outside of Short range.",
                facetType, localFacet)
            }
          }
          case PrimType.Long => {
            if (!isFacetInLongRange(theLocalFacet)) {
              context.SDE("%s facet value (%s) was found to be outside of Long range.",
                facetType, localFacet)
            }
          }
          case PrimType.Integer => {
            // Unbounded integer
            if (!isFacetInIntegerRange(theLocalFacet)) {
              context.SDE("%s facet value (%s) was found to be outside of Integer range.",
                facetType, localFacet)
            }
          }
          case PrimType.UnsignedInt => {
            if (!isFacetInUnsignedIntRange(theLocalFacet)) {
              context.SDE("%s facet value (%s) was found to be outside of unsigned int range.",
                facetType, localFacet)
            }
          }
          case PrimType.UnsignedByte => {
            if (!isFacetInUnsignedByteRange(theLocalFacet)) {
              context.SDE("%s facet value (%s) was found to be outside of unsigned byte range.",
                facetType, localFacet)
            }
          }
          case PrimType.UnsignedShort => {
            if (!isFacetInUnsignedShortRange(theLocalFacet)) {
              context.SDE("%s facet value (%s) was found to be outside of unsigned short range.",
                facetType, localFacet)
            }
          }
          case PrimType.UnsignedLong => {
            if (!isFacetInUnsignedLongRange(theLocalFacet)) {
              context.SDE("%s facet value (%s) was found to be outside of unsigned long range.",
                facetType, localFacet)
            }
          }
          case PrimType.Double => {
            if (!isFacetInDoubleRange(theLocalFacet)) {
              context.SDE("%s facet value (%s) was found to be outside of Double range.",
                facetType, localFacet)
            }
          }
          case PrimType.Float => {
            if (!isFacetInFloatRange(theLocalFacet)) {
              context.SDE("%s facet value (%s) was found to be outside of Float range.",
                facetType, localFacet)
            }
          }
          case PrimType.NonNegativeInteger => {
            // Unsigned Unbounded Integer
            if (!isFacetInNonNegativeIntegerRange(theLocalFacet)) {
              context.SDE("%s facet value (%s) was found to be outside of NonNegativeInteger range.",
                facetType, localFacet)
            }
          }
          case PrimType.DateTime => { /* Nothing to do here */ }
          case PrimType.Date => { /* Nothing to do here */ }
          case PrimType.Time => { /* Nothing to do here */ }
          case PrimType.Boolean => notYetImplemented("checkValueSpaceFacetRange - Boolean")
          case PrimType.HexBinary => { /* Nothing to do here */ }
          case PrimType.String => { /* Nothing to do here */ }
          case _ => schemaDefinitionError("checkValueSpaceFacetRange - Unrecognized primitive type: %s", primType.name)
        }
      }
      case _ => { /* Nothing to do */ }
    }
    theLocalFacet
  }

  private def checkValueSpaceFacetRange(localFacet: String,
    remoteFacet: String, facetType: Facet.Type): (java.math.BigDecimal, java.math.BigDecimal) = {
    // Neccessary for min/max Inclusive/Exclusive Facets

    // TODO: I think the performance here can be improved.
    //
    // Consider storing the remoteBaseFacets as their actual evaluated values
    // rather than just as String.  This would prevent us from having to perform
    // the checkValueSpaceFacetRange on the remoteFacet here as it would've already
    // been done in the base. --TRW

    // Perform conversions once
    val theRemoteFacet = checkValueSpaceFacetRange(remoteFacet, facetType) //new java.math.BigDecimal(remoteFacet)
    val theLocalFacet = checkValueSpaceFacetRange(localFacet, facetType)

    (theLocalFacet, theRemoteFacet)
  }

  private def isFacetInByteRange(facet: java.math.BigDecimal): Boolean = self.isInByteRange(facet)

  private def isFacetInShortRange(facet: java.math.BigDecimal): Boolean = self.isInShortRange(facet)
  private def isFacetInIntRange(facet: java.math.BigDecimal): Boolean = self.isInIntRange(facet)
  private def isFacetInIntegerRange(facet: java.math.BigDecimal): Boolean = self.isInIntegerRange(facet)
  private def isFacetInLongRange(facet: java.math.BigDecimal): Boolean = self.isInLongRange(facet)
  private def isFacetInDoubleRange(facet: java.math.BigDecimal): Boolean = self.isInDoubleRange(facet)
  private def isFacetInFloatRange(facet: java.math.BigDecimal): Boolean = self.isInFloatRange(facet)
  //  private def isFacetInDecimalRange(facet: java.math.BigDecimal): Boolean = {
  //     BigDecimal is unbounded? So nothing outside of its range?
  //    true
  //  }
  //  private def isFacetInNegativeIntegerRange(facet: java.math.BigDecimal): Boolean = self.isInNonNegativeIntegerRange(facet)
  private def isFacetInNonNegativeIntegerRange(facet: java.math.BigDecimal): Boolean = self.isInNonNegativeIntegerRange(facet)
  private def isFacetInUnsignedLongRange(facet: java.math.BigDecimal): Boolean =
    isInUnsignedLongRange(facet)

  private def isFacetInUnsignedIntRange(facet: java.math.BigDecimal): Boolean =
    isInUnsignedIntRange(facet)

  private def isFacetInUnsignedShortRange(facet: java.math.BigDecimal): Boolean =
    isInUnsignedShortRange(facet)

  private def isFacetInUnsignedByteRange(facet: java.math.BigDecimal): Boolean =
    isInUnsignedByteRange(facet)

  protected def doNumericFacetNarrowing(localFacet: String, remoteFacet: String, facetType: Facet.Type) = {
    // Assumes both local and remote facets exist
    // Only for Numeric facets
    //
    // Can likely do narrowing checks here
    //
    // BigInt use compareTo
    //  a negative number, zero, or a positive number as this BigInteger is numerically less than,
    //  equal to, or greater than o, which must be a BigInteger.
    facetType match {
      case Facet.minLength | Facet.maxLength | Facet.fractionDigits => {
        // Non-negative Integers.  BigInt
        narrowNonNegativeFacets(localFacet, remoteFacet, facetType)
      }
      case Facet.minInclusive | Facet.maxInclusive | Facet.minExclusive | Facet.maxExclusive => {
        // In value-space of base type.  BigDecimal?
        narrowValueSpaceFacets(localFacet, remoteFacet, facetType)
      }
      case Facet.totalDigits => {
        // Positive Integer (value greater than 0). BigInt
        narrowPositiveIntegerFacets(localFacet, remoteFacet, facetType)
      }
      case _ => Assert.usageError("Call to 'doNumericFacetNarrowing' only valid for Numeric Facets.")
    }
  }

  private def getLocalValue(theType: Facet.Type) = {
    val res = localBaseFacets.filter { case (f, v) => f == theType }
    if (res.length > 0) {
      val (_, theFacetValue) = res(0)
      theFacetValue
    } else ""
  }

  protected def getCombinedValue(theType: Facet.Type) = {
    val lValue = getLocalValue(theType)
    val rValue = getRemoteFacetValue(theType)
    val cValue = getFacetValue(lValue, rValue, theType, true)
    cValue
  }

  protected def getCombinedValueEnum = {
    val lValue = getLocalValue(Facet.enumeration)
    val rValue = getRemoteFacetValue(Facet.enumeration)
    lValue.foreach(e => {
      if (rValue.length() > 0 && !rValue.contains(e)) context.SDE("Local enumerations must be a subset of base enumerations.")
    })
    if (lValue.length() > 0) { lValue }
    else { rValue }
  }

}
