/*
 *
 *  Copyright (C) 2015-2016, Open Connections GmbH
 *  All rights reserved.  See COPYRIGHT file for details.
 *
 *  This software and supporting documentation are maintained by
 *
 *    OFFIS e.V.
 *    R&D Division Health
 *    Escherweg 2
 *    D-26121 Oldenburg, Germany
 *
 *
 *  Module: dcmiod
 *
 *  Author: Michael Onken
 *
 *  Purpose: Abstract base class for IOD Modules or other attribute collections
 *
 */

#include "dcmtk/config/osconfig.h"    /* make sure OS specific configuration is included first */
#include "dcmtk/dcmiod/modbase.h"
#include "dcmtk/dcmdata/dcitem.h"
#include "dcmtk/dcmiod/iodutil.h"
#include "dcmtk/dcmiod/iodrules.h"
#include "dcmtk/dcmdata/dcdeftag.h"


IODComponent::IODComponent(const IODComponent& rhs)
: m_Item(OFstatic_cast(DcmItem*, rhs.m_Item->clone()))
, m_Rules(rhs.m_Rules->clone())
, m_Parent(OFnullptr)
{

}


IODComponent::IODComponent(OFshared_ptr<DcmItem> item,
                           OFshared_ptr<IODRules> rules,
                           IODComponent* parent)
: m_Item(item),
  m_Rules(rules),
  m_Parent(parent)
{
  if (!m_Item)
    m_Item.reset(new DcmItem());

  if (!m_Rules)
    m_Rules.reset(new IODRules());
}


IODComponent::IODComponent(IODComponent* parent)
: m_Item(),
  m_Rules(),
  m_Parent(parent)
{
  m_Item.reset(new DcmItem());
  m_Rules.reset(new IODRules());
}


IODComponent::~IODComponent()
{
  // Nothing to do for shared pointers
}


IODComponent& IODComponent::operator=(const IODComponent& rhs)
{
  if (&rhs != this)
  {
    m_Item.reset(OFstatic_cast(DcmItem*, rhs.m_Item->clone()));
    m_Rules.reset(rhs.m_Rules->clone());
    m_Parent = OFnullptr;
  }
  return *this;
}


void IODComponent::inventMissing()
{
  // Try to fill in missing type 1 information
  OFVector<IODRule*> writeRules = m_Rules->getByModule(getName());
  OFVector<IODRule*>::iterator rule = writeRules.begin();
  while (rule != writeRules.end())
  {
    OFString val = (*rule)->getDefaultValue() ;
    // We have a default value
    if ( val.length() != 0 )
    {
      // Check if element is not set
      DcmElement *elem = NULL;
      if ( getData().findAndGetElement( (*rule)->getTagKey(), elem ).bad() )
      {
        elem = newDicomElement((*rule)->getTagKey());
        if (elem == NULL)
        {
          DCMIOD_ERROR("Could not allocate element " << (*rule)->getTagKey());
        }
        else
        {
          elem->putString(val.c_str());
          m_Item->insert(elem);
        }
      }
      else if (elem->getLength() == 0)
      {
        elem->putString(val.c_str());
      }
    }
    rule++;
  }
}


void IODComponent::clearData()
{
  OFVector<IODRule*> modRules = m_Rules->getByModule(getName());
  OFVector<IODRule*>::iterator rule = modRules.begin();
  while (rule != modRules.end())
  {
    m_Item->findAndDeleteElement( (*rule)->getTagKey() );
    rule++;
  }
}


void IODComponent::makeOptional()
{
  OFVector<IODRule*> modRules = m_Rules->getByModule(getName());
  OFVector<IODRule*>::iterator rule = modRules.begin();
  while (rule != modRules.end())
  {
    (*rule)->setType("3");
    rule++;
  }
}


OFCondition IODComponent::read(DcmItem& source,
                               OFBool clearOldData)
{
  // Debug
  DCMIOD_DEBUG("Reading component: " << getName());

  // Clear old data if desired
  if (clearOldData)
  {
    clearData();
  }

  // Do actual reading
  read(source, *m_Rules, *m_Item, getName());
  // We do not report errors here (only logger output)
  return EC_Normal;
}


OFCondition IODComponent::write(DcmItem& destination)
{
  // Debug
  DCMIOD_DEBUG("Writing component: " << getName());

  // Invent missing values
  inventMissing();

  // Start writing
  OFCondition result = EC_Normal;
  result = write(*m_Item, *m_Rules, destination, getName());
  return result;
}


int IODComponent::compare(const IODComponent& rhs) const
{
  return this->m_Item.get()->compare( *(rhs.m_Item.get()) ) ;
}


OFCondition IODComponent::check(const OFBool quiet)
{
  OFCondition result;
  IODRules::iterator it = m_Rules->begin();
  while (it != m_Rules->end())
  {
    result = (*it).second->check(*m_Item, quiet);
    if (result.bad())
      break;
    else
      it++;
  }
  return result;
}


// static helper
OFCondition IODComponent::read(DcmItem& source,
                               IODRules& rules,
                               DcmItem& destination,
                               const OFString& componentName)
{
  OFVector<IODRule*> modRules = rules.getByModule(componentName);
  OFVector<IODRule*>::iterator rule = modRules.begin();
  while (rule != modRules.end())
  {
    // We do not read/copy sequences but only check them since they are not
    // handled within this component
    OFBool isSequence = ( DcmTag( (*rule)->getTagKey()).getEVR() == EVR_SQ);
    if (isSequence)
    {
      DcmElement *elem = NULL;
      OFCondition cond = source.findAndGetElement( (*rule)->getTagKey(), elem);
      DcmIODUtil::checkElementValue(elem, (*rule)->getTagKey(), (*rule)->getVM(), (*rule)->getType(), cond, (*rule)->getModule().c_str());
    }
    else // Normal attributes are checked and copied over into this IOD component
    {
      DcmElement* elem = NULL;
      DcmIODUtil::getAndCheckElementFromDataset(source, elem, *rule);
      if (elem != NULL)
      {
        OFCondition result = destination.insert(elem, OFTrue);
        if (result.bad())
        {
          DCMIOD_ERROR("Cannot insert element with tag: " << (*rule)->getTagKey());
          delete elem;
        }
      }
    }
    rule++;
  }
  return EC_Normal;
}


// static helper
OFCondition IODComponent::write(DcmItem& source,
                                IODRules& rules,
                                DcmItem& destination,
                                const OFString& componentName)
{
  OFCondition result = EC_Normal;

  OFVector<IODRule*> writeRules = rules.getByModule(componentName);
  OFVector<IODRule*>::iterator rule = writeRules.begin();
  while (rule != writeRules.end())
  {
    DcmElement* elem = NULL;
    source.findAndGetElement( (*rule)->getTagKey(), elem, OFFalse /* only this level */, OFTrue /* create copy*/);
    DcmIODUtil::addElementToDataset(result, destination, elem, *rule);
    rule++;
  }

  return result;
}


// -------- IODModule --------------

IODModule::IODModule(): IODComponent()
{
  // nothing to do, IODComponent does the work
}


IODModule::IODModule(const IODModule& rhs)
: IODComponent(rhs.m_Item, rhs.m_Rules, rhs.m_Parent)
{

}


IODModule::IODModule(OFshared_ptr< DcmItem > item,
  OFshared_ptr< IODRules > rules)
: IODComponent(item, rules, NULL /* No parent for modules */)
{
  // nothing to do, IODComponent does the work
}


IODModule& IODModule::operator=(const IODModule& rhs)
{
  if (this != &rhs)
  {
    m_Item = rhs.m_Item;
    m_Rules = rhs.m_Rules;
    m_Parent = rhs.m_Parent;
  }
  return *this;
}
