#include "ElInfoStack.h"
#include "Mesh.h"

namespace AMDiS {
  
  ElInfoStack::ElInfoStack(Mesh *mesh) 
    : mesh_(mesh),
      stackPosition_(-1)
  {
    elInfoStack_.resize(20);
    for (int i = 0; i < 20; i++) {
      elInfoStack_[i] = mesh_->createNewElInfo();
    }
  }

  ElInfoStack::~ElInfoStack()
  {
    for (int i = 0; i < static_cast<int>(elInfoStack_.size()); i++) {
      DELETE elInfoStack_[i];
    }     
  }

  ElInfo* ElInfoStack::getNextElement()
  {
    // Check if the stack if large enough. If not, the stack is enlarged
    // and new elements are created.
    if (stackPosition_ + 1 >= static_cast<int>(elInfoStack_.size())) {
      int oldSize = elInfoStack_.size();
      elInfoStack_.resize(oldSize + oldSize / 2);
      for (int i = oldSize; i < static_cast<int>(elInfoStack_.size()); i++) {
	elInfoStack_[i] = mesh_->createNewElInfo();
      }
    }

    stackPosition_++;
    
    return elInfoStack_[stackPosition_];
  }

  void ElInfoStack::getBackElement()
  {
    TEST_EXIT_DBG(stackPosition_ >= 0)("Invalid stack position!\n");

    stackPosition_--;
  }

  ElInfo* ElInfoStack::getCurrentElement()
  {
    TEST_EXIT_DBG(stackPosition_ >= 0)("Invalid stack position!\n");
    
    return elInfoStack_[stackPosition_];
  }
}