/**************************************************************************\
 *
 *  This file is part of the Coin 3D visualization library.
 *  Copyright (C) 1998-2006 by Systems in Motion.  All rights reserved.
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU General Public License
 *  ("GPL") version 2 as published by the Free Software Foundation.
 *  See the file LICENSE.GPL at the root directory of this source
 *  distribution for additional information about the GNU GPL.
 *
 *  For using Coin with software that can not be combined with the GNU
 *  GPL, and for taking advantage of the additional benefits of our
 *  support services, please contact Systems in Motion about acquiring
 *  a Coin Professional Edition License.
 *
 *  See http://www.coin3d.org/ for more information.
 *
 *  Systems in Motion, Postboks 1283, Pirsenteret, 7462 Trondheim, NORWAY.
 *  http://www.sim.no/  sales@sim.no  coin-support@coin3d.org
 *
\**************************************************************************/

/*!
  \class SoSFEnum SoSFEnum.h Inventor/fields/SoSFEnum.h
  \brief The SoSFEnum class is a container for an enum value.
  \ingroup fields

  This field is used where nodes, engines or other field containers
  needs to store one particular value out of an enumerated set.

  A field of this type stores its value to file as the symbolic
  name, rather than the actual integer value.

  \sa SoMFEnum, SoSFBitMask
*/

// *************************************************************************

#include <Inventor/fields/SoSFEnum.h>
#include <Inventor/fields/SoSubFieldP.h>
#include <Inventor/fields/SoFieldContainer.h>
#include <Inventor/errors/SoReadError.h>
#include <Inventor/SoInput.h>
#include <Inventor/SoOutput.h>
#include <Inventor/errors/SoDebugError.h>

// *************************************************************************

/*!
  \var int SoSFEnum::numEnums
  Number of enumeration mappings.
*/
/*!
  \var SbName * SoSFEnum::enumNames
  Array of enumeration names. Maps 1-to-1 with the enumValues.
*/
/*!
  \var int * SoSFEnum::enumValues
  Array of enumeration values. Maps 1-to-1 with the enumNames.
*/
/*!
  \var SbBool SoSFEnum::legalValuesSet
  Is \c TRUE if a set of enum name-to-value mappings has been set.
*/

// *************************************************************************

PRIVATE_TYPEID_SOURCE(SoSFEnum);
PRIVATE_EQUALITY_SOURCE(SoSFEnum);

// *************************************************************************

// (Declarations hidden in SO_[S|M]FIELD_HEADER macro in header file,
// so don't use Doxygen commenting.)
#ifndef DOXYGEN_SKIP_THIS

/* Constructor. */
SoSFEnum::SoSFEnum(void)
{
  this->enumValues = NULL;
  this->enumNames  = NULL;
  this->numEnums = 0;
  this->legalValuesSet = FALSE;
}

/* Destructor. */
SoSFEnum::~SoSFEnum()
{
  delete[] this->enumValues;
  delete[] this->enumNames;
}

// *************************************************************************

/* Copy enumeration mappings and \a field value. */
const SoSFEnum &
SoSFEnum::operator=(const SoSFEnum & field)
{
  this->setEnums(field.numEnums, field.enumValues, field.enumNames);
  this->setValue(field.getValue());
  return *this;
}

#endif // DOXYGEN_SKIP_THIS


// Override from parent class.
void
SoSFEnum::initClass(void)
{
  SO_SFIELD_INTERNAL_INIT_CLASS(SoSFEnum);
}

/*!
  Makes a set of \a num enumeration \a names map to integer values,
  given by \a vals.
*/
void
SoSFEnum::setEnums(const int num, const int * vals, const SbName * names)
{
  delete[] this->enumValues;
  delete[] this->enumNames;

  this->enumValues = new int[num];
  this->enumNames = new SbName[num];
  this->numEnums = num;
  this->legalValuesSet = TRUE;

  for (int i = 0; i < this->numEnums; i++) {
    this->enumValues[i] = vals[i];
    this->enumNames[i] = names[i];
  }
}

/*!
  Return in \a val the enumeration value which matches the given
  enumeration \a name.

  Returns \c TRUE if \a name is a valid enumeration string, otherwise
  \c FALSE.
*/
SbBool
SoSFEnum::findEnumValue(const SbName & name, int & val)
{
  // Look through names table for one that matches
  for (int i = 0; i < this->numEnums; i++) {
    if (name == this->enumNames[i]) {
      val = this->enumValues[i];
      return TRUE;
    }
  }
  return FALSE;
}

/*!
  Set the enumeration \a name which matches the given enumeration
  value.

  Returns \c TRUE if \a value is a valid enumeration value, otherwise
  \c FALSE.
*/
SbBool
SoSFEnum::findEnumName(int valuearg, const SbName *& name) const
{
  // Look through values table for one that matches
  for (int i = 0; i < this->numEnums; i++) {
    if (valuearg == this->enumValues[i]) {
      name = &(this->enumNames[i]);
      return TRUE;
    }
  }
  return FALSE;
}

// No need to document readValue() and writeValue() here, as the
// necessary information is provided by the documentation of the
// parent classes.
#ifndef DOXYGEN_SKIP_THIS

SbBool
SoSFEnum::readValue(SoInput * in)
{
  SbName n;
  int val;

  // Read mnemonic value as a character string identifier
  if (!in->read(n, TRUE)) {
    // If we don't have any legal values for this field,
    // give some slack and accept integer values.
    if (this->legalValuesSet || !in->read(val)) {
      SoReadError::post(in, "Couldn't read enumeration name");
      return FALSE;
    }
  }
  else {
    if (!this->findEnumValue(n, val)) {
      // If we read an enum field written by an extension node,
      // we won't have any defined enum values. This is indicated by
      // this->legalValuesSet == FALSE. If this is the case, define
      // any encountered enum values on the fly but keep legalValuesSet
      // to FALSE in order not to fool built-in enum field to accept
      // illegal values.
      if (!this->legalValuesSet) {
        int *newvalues = new int[this->numEnums+1];
        SbName *newnames = new SbName[this->numEnums+1];
        int i;
        for (i = 0; i < this->numEnums; i++) {
          newvalues[i] = this->enumValues[i];
          newnames[i] = this->enumNames[i];
        }
        newvalues[i] = i;
        newnames[i] = n;
        delete[] this->enumValues;
        delete[] this->enumNames;
        this->enumValues = newvalues;
        this->enumNames = newnames;
        this->numEnums += 1;
        val = i;
      }
      else {
        SoReadError::post(in, "Unknown enumeration value \"%s\"", n.getString());
        return FALSE;
      }
    }
  }
  this->value = val;
  return TRUE;
}

void
SoSFEnum::writeValue(SoOutput * out) const
{
  const SbName *enumname;
  if (findEnumName(this->getValue(), enumname)) {
    out->write((char *)enumname->getString());
    return;
  }
  // If we don't have any legal values for this field,
  // pass through read integer values.
  if (!this->legalValuesSet) {
    out->write(this->getValue());
    return;
  }

#if COIN_DEBUG
  // An unknown enumeration value will usually be an indication of a
  // more serious bug, so we elaborate a bit on the error to aid early
  // debugging.  mortene.

  SbName name;
  const SoFieldContainer * thecontainer = this->getContainer();
  const SbBool fname = thecontainer && thecontainer->getFieldName(this, name);
  SbString s("");
  if (fname) { s.sprintf(" \"%s\"", name.getString()); }

  SoDebugError::post("SoSFEnum::writeValue",
                     "Illegal enumeration value %d in field%s",
                     this->getValue(), s.getString());
#endif // COIN_DEBUG
}

/*!
  Compare this field with \a f and return \c TRUE if they are
  equal.
*/
int
SoSFEnum::operator==(const SoSFEnum & f) const
{
  // Check for value mismatch first.
  if (this->getValue() != f.getValue()) return FALSE;

  // Check that we have the same enumeration mappings.
  if (this->numEnums != f.numEnums) return FALSE;
  for (int i = 0; i < this->numEnums; i++) {
    if (this->enumValues[i] != f.enumValues[i]) return FALSE;
    if (this->enumNames[i] != f.enumNames[i]) return FALSE;
  }

  return TRUE;
}

/*!
  Set the value of this field by specifying an enumeration integer value.
*/
void
SoSFEnum::setValue(int newvalue)
{
  this->value = newvalue;
  this->valueChanged();
}

#endif // DOXYGEN_SKIP_THIS

/*!
  Set the value of this field by specifying an enumeration string value.
*/
void
SoSFEnum::setValue(const SbName name)
{
  int val;
  if (this->findEnumValue(name, val)) {
    this->setValue(val);
  }
  else {
#if COIN_DEBUG
    SoDebugError::post("SoSFEnum::setValue",
                       "Unknown enum '%s'", name.getString());
#endif // COIN_DEBUG
  }
}

/*!
  Returns the number of enum names the SoSFEnum object understands.

  Note that this API method is not part of the original SGI Inventor
  2.1 API, and is an extension specific to Coin.

  \COIN_FUNCTION_EXTENSION

  \since Coin 2.0
*/
int
SoSFEnum::getNumEnums(void) const
{
  return this->numEnums;
}

/*!
  Returns the value of the Nth enum this SoSFEnum object understands,
  and mutates \a name to contain the Nth enum's name.

  Note that this API method is not part of the original SGI Inventor
  2.1 API, and is an extension specific to Coin.

  \COIN_FUNCTION_EXTENSION

  \since Coin 2.0
*/
int
SoSFEnum::getEnum(const int idx, SbName & name) const
{
  if ( COIN_DEBUG && (idx < 0 || idx >= this->numEnums) ) {
    SoDebugError::post("SoSFEnum::getEnum", "idx (%d) out of range", idx);
    return -1;
  }
  name = this->enumNames[idx];
  return this->enumValues[idx];
}
