/*
 * Dillo Widget
 *
 * Copyright 2014 Sebastian Geerken <sgeerken@dillo.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include "oofawarewidget.hh"
#include "ooffloatsmgr.hh"
#include "oofposabsmgr.hh"
#include "oofposfixedmgr.hh"

using namespace dw;
using namespace dw::core;
using namespace lout::misc;
using namespace lout::object;

namespace dw {

namespace oof {

// "numContentsInFlow" is passed here to avoid indirectly calling the (virtual)
// method numContentsInFlow() from the constructor.
OOFAwareWidget::OOFAwareWidgetIterator::OOFAwareWidgetIterator
   (OOFAwareWidget *widget, Content::Type mask, bool atEnd,
    int numContentsInFlow) :
   Iterator (widget, mask, atEnd)   
{
   if (atEnd) {
      sectionIndex = NUM_SECTIONS - 1;
      while (sectionIndex >= 0 &&
             numParts (sectionIndex, numContentsInFlow) == 0)
         sectionIndex--;
      index = numParts (sectionIndex, numContentsInFlow);
   } else {
      sectionIndex = 0;
      index = -1;
   }

   content.type = atEnd ? core::Content::END : core::Content::START;
}

void OOFAwareWidget::OOFAwareWidgetIterator::setValues (int sectionIndex,
                                                        int index)
{
   this->sectionIndex = sectionIndex;
   this->index = index;

   if (sectionIndex == 0 && index < 0)
      content.type = core::Content::START;
   else if (sectionIndex == NUM_SECTIONS - 1 &&
            index >= numParts (sectionIndex))
      content.type = core::Content::END;
   else
      getPart (sectionIndex, index, &content);
}

int OOFAwareWidget::OOFAwareWidgetIterator::numParts (int sectionIndex,
                                                      int numContentsInFlow)
{
   DBG_OBJ_ENTER_O ("iterator", 0, getWidget(), "numParts", "%d, %d",
                    sectionIndex, numContentsInFlow);

   OOFAwareWidget *widget = (OOFAwareWidget*)getWidget();
   int result;

   if (sectionIndex < 0 || sectionIndex > NUM_SECTIONS) {
      DBG_OBJ_MARKF_O("iterator", 0, getWidget(), "invalid sectionIndex %d",
                      sectionIndex);
      result = 0;
   } else if (sectionIndex == 0)
      result = numContentsInFlow == -1 ?
         this->numContentsInFlow () : numContentsInFlow;
   else
      result = widget->outOfFlowMgr[sectionIndex - 1] ?
         widget->outOfFlowMgr[sectionIndex - 1]->getNumWidgets () : 0;

   DBG_OBJ_MSGF_O ("iterator", 1, getWidget(), "=> %d", result);
   DBG_OBJ_LEAVE_O (getWidget());
   return result;
}

void OOFAwareWidget::OOFAwareWidgetIterator::getPart (int sectionIndex,
                                                      int index,
                                                      Content *content)
{
   OOFAwareWidget *widget = (OOFAwareWidget*)getWidget();

   if (sectionIndex == 0)
      getContentInFlow (index, content);
   else {
      content->type = Content::WIDGET_OOF_CONT;
      content->widget =
         widget->outOfFlowMgr[sectionIndex - 1]->getWidget (index);
   }
}

void OOFAwareWidget::OOFAwareWidgetIterator::intoStringBuffer (StringBuffer *sb)
{
   Iterator::intoStringBuffer (sb);
   sb->append (", sectionIndex = ");
   sb->appendInt (sectionIndex);
   sb->append (", index = ");
   sb->appendInt (index);
}

int OOFAwareWidget::OOFAwareWidgetIterator::compareTo (Comparable *other)
{
   OOFAwareWidgetIterator *otherTI = (OOFAwareWidgetIterator*)other;

   if (sectionIndex != otherTI->sectionIndex)
      return sectionIndex - otherTI->sectionIndex;
   else
      return index - otherTI->index;
}

bool OOFAwareWidget::OOFAwareWidgetIterator::next ()
{
   DBG_OBJ_ENTER0_O ("iterator", 0, getWidget (),
                     "OOFAwareWidgetIterator/next");

   DBG_IF_RTFL {
      StringBuffer sb;
      intoStringBuffer (&sb);
      DBG_OBJ_MSGF_O ("iterator", 1, getWidget (),
                      "initial value: %s; sectionIndex = %d, index = %d",
                      sb.getChars (), sectionIndex, index);
   }

   bool r;

   if (content.type == Content::END)
      r = false;
   else {
      r = true;
      bool cancel = false;

      do {
         index++;
         
         if (sectionIndex >= 0 && index < numParts(sectionIndex))
            getPart (sectionIndex, index, &content);
         else {
            sectionIndex++;
            while (sectionIndex < NUM_SECTIONS && numParts (sectionIndex) == 0)
               sectionIndex++;
            
            if (sectionIndex == NUM_SECTIONS) {
               content.type = Content::END;
               r = false;
               cancel = true;
            } else {
               index = 0;
               getPart (sectionIndex, index, &content);
            }
         }         
      } while (!cancel && (content.type & getMask()) == 0);
   }

   DBG_IF_RTFL {
      StringBuffer sb;
      intoStringBuffer (&sb);
      DBG_OBJ_MSGF_O ("iterator", 1, getWidget (), "final value: %s",
                      sb.getChars ());
      DBG_OBJ_MSGF_O ("iterator", 1, getWidget (), "return value: %s",
                      r ? "true" : "false");
   }

   DBG_OBJ_LEAVE_O (getWidget ());
   return r;
}

bool OOFAwareWidget::OOFAwareWidgetIterator::prev ()
{
   DBG_OBJ_ENTER0_O ("iterator", 0, getWidget (),
                     "OOFAwareWidgetIterator/prev");

   DBG_IF_RTFL {
      StringBuffer sb;
      intoStringBuffer (&sb);
      DBG_OBJ_MSGF_O ("iterator", 1, getWidget (),
                      "initial value: %s; sectionIndex = %d, index = %d",
                      sb.getChars (), sectionIndex, index);
   }

   bool r;

   if (content.type == Content::START)
      r = false;
   else {
      r = true;
      bool cancel = false;

      do {
         index--;
         
         if (sectionIndex < NUM_SECTIONS &&
             numParts (sectionIndex) > 0 && index >= 0)
            getPart (sectionIndex, index, &content);
         else {
            sectionIndex--;
            while (sectionIndex >= 0 && numParts (sectionIndex) == 0)
               sectionIndex--;
            
            if (sectionIndex < 0) {
               content.type = Content::START;
               r = false;
               cancel = true;
            } else {
               index = numParts (sectionIndex) - 1;
               getPart (sectionIndex, index, &content);
            }
         }        
      } while (!cancel && (content.type & getMask()) == 0);
   }
      
   DBG_IF_RTFL {
      StringBuffer sb;
      intoStringBuffer (&sb);
      DBG_OBJ_MSGF_O ("iterator", 1, getWidget (), "final value: %s",
                      sb.getChars ());
      DBG_OBJ_MSGF_O ("iterator", 1, getWidget (), "return value: %s",
                      r ? "true" : "false");
   }

   DBG_OBJ_LEAVE_O (getWidget ());
   return r;
}

void OOFAwareWidget::OOFAwareWidgetIterator::highlightOOF (int start, int end,
                                                           HighlightLayer layer)
{
   // TODO What about OOF widgets?
}

void OOFAwareWidget::OOFAwareWidgetIterator::unhighlightOOF (int direction,
                                                             HighlightLayer
                                                             layer)
{
   // TODO What about OOF widgets?
}

void OOFAwareWidget::OOFAwareWidgetIterator::getAllocationOOF (int start,
                                                               int end,
                                                               Allocation
                                                               *allocation)
{
   // TODO Consider start and end?
   OOFAwareWidget *widget = (OOFAwareWidget*)getWidget();
   *allocation = *(widget->outOfFlowMgr[sectionIndex - 1]
                   ->getWidget(index)->getAllocation());
}

} // namespace oof

} // namespace dw