/*
 * Project: MoleCuilder
 * Description: creates and alters molecular systems
 * Copyright (C)  2010 University of Bonn. All rights reserved.
 * Please see the LICENSE file or "Copyright notice" in builder.cpp for details.
 */

/*
 * TxMenu.cpp
 *
 *  Created on: Dec 10, 2009
 *      Author: crueger
 */

// include config.h
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif

#include "Helpers/MemDebug.hpp"

#include <boost/bind.hpp>
#include <algorithm>
#include <iostream>
#include <cmath>
#include "Actions/Action.hpp"
#include "Actions/ActionTraits.hpp"
#include "Menu/TextMenu/TxMenu.hpp"
#include "Menu/TextMenu/MenuItem.hpp"
#include "Helpers/Assert.hpp"


/** Constructor for class TxMenu.
 *
 * produce a text menu with a given title.
 * The text will later be displayed using the stream passed to the constructor.
 * \param &_outputter output stream to use for displaying the text
 * \param _title title of this menu
 * \param _spacer key to separate trigger key from descriptive text shown
 * \param _length maximum length of the descriptive text
 */
TxMenu::TxMenu(std::ostream& _outputter, const std::string _title, char _spacer,int _length) :
  defaultItem(0),
  outputter(_outputter),
  title(_title),
  spacer(_spacer),
  length(_length),
  quit(false)
{
}

/** Destructor for class TxMenu.
 *
 */
TxMenu::~TxMenu()
{
  for(std::list<MenuItem*>::iterator it=items.begin(); it != items.end(); it++)
    delete (*it);
}

/** Adds an MenuItem to the internal list.
 * \param *item item to add
 */
void TxMenu::addItem(MenuItem* item) {
  items.push_back(item);
}

/** Removes an MenuItem to the internal list.
 * \param *item item to remove
 */
void TxMenu::removeItem(MenuItem* item) {
  items.remove(item);
}

/** Function to quit this TxMenu.
 */
void TxMenu::doQuit(){
  quit = true;
}

/** Return the current state of quitting.
 * \return quit boolean
 */
bool TxMenu::hasQuit(){
  return quit;
}

/** Display in a formatted manner a given entry of this menu.
 * \param *entry MenuItem to show
 */
void TxMenu::showEntry(MenuItem* entry){
  if(entry->isActive()==false){
    outputter << "(";
  }
  outputter << entry->formatEntry();
  if(entry->isActive()==false){
    outputter << ")";
  }
  outputter << "\n";
}

/** Display this menu.
 *
 */
void TxMenu::display() {
  char choice;
  bool somethingChosen = false;
  quit = false;
  do {
    int pre = floor((length - title.length()) /2.0);
    int post = ceil((length - title.length()) /2.0);
    for(int i=0;i<pre;i++)
      outputter << spacer;
    outputter << title;
    for(int i=0;i<post;i++)
          outputter << spacer;
    outputter << '\n';
    for_each(items.begin(), items.end(), boost::bind(&TxMenu::showEntry,this,_1));
    outputter.flush();

    std::cin >> choice;

    std::list<MenuItem*>::iterator iter;
    for(iter = items.begin(); iter!=items.end();iter++){
      if((*iter)->isActive()){
        somethingChosen |= (*iter)->checkTrigger(choice);
      }
    }
    // see if something was chosen and call default Item if not
    if(!somethingChosen) {
      if(defaultItem){
        defaultItem->doTrigger();
      }
      else{
        outputter << "Invalid Choice!" <<  std::endl;
      }
    }
  }while (!hasQuit());
}

/**  Return the internally stored title of the menu.
 * \return title string
 */
std::string TxMenu::getTitle(){
  return title;
}

/**  Return the internally stored outputter of the menu.
 * \return output stream reference
 */
std::ostream& TxMenu::getOutputter()
{
  return outputter;
}

/** Add a default item to the menu.
 * \param *_defaultItem MenuItem to act as default item.
 */
void TxMenu::addDefault(MenuItem* _defaultItem) {
  defaultItem = _defaultItem;
}

/****************************** Contained Actions ****************/

/** Constructor for class TxMenu::LeaveAction.
 * \param _menu pointer to the containing TxMenu
 * \param &LeaveActionTrait ActionTraits for this Action
 */
TxMenu::LeaveAction::LeaveAction(TxMenu* const _menu, const ActionTraits & LeaveActionTrait) :
  Action(LeaveActionTrait, true),
  menu(_menu)
{}

/** Destructor for class TxMenu::LeaveAction.
 *
 */
TxMenu::LeaveAction::~LeaveAction(){}

/** We can't undo the leave action.
 * \return false
 */
bool TxMenu::LeaveAction::canUndo(){
  return false;
}

/** We should never undo the leave action.
 * \return false
 */
bool TxMenu::LeaveAction::shouldUndo(){
  return false;
}

/** Internal function to obtain parameters from a storage.
 * We do not use this one as we don't need any parameters.
 */
void TxMenu::LeaveAction::getParametersfromValueStorage()
{}

/** Internal function to construct the dialog.
 * We do not need this function as there is no dialog to construct.
 */
Dialog* TxMenu::LeaveAction::fillDialog(Dialog *dialog){
  ASSERT(dialog,"No Dialog given when filling action dialog");
  return dialog;
}

/** Calls TxMenu::doQuit() on the stored menu reference.
 * \return ActionState pointer with success
 */
Action::state_ptr TxMenu::LeaveAction::performCall(){
  menu->doQuit();
  return Action::success;
}

/** Implementation of undo function for an Action.
 * We do not use this functionality.
 * \return ActionState pointer with failure
 */
Action::state_ptr TxMenu::LeaveAction::performUndo(Action::state_ptr){
  ASSERT(0,"Cannot undo leaving a menu");
  return Action::failure;
}

/** Implementation of redo function for an Action.
 * We do not use this functionality.
 * \return ActionState pointer with failure
 */
Action::state_ptr TxMenu::LeaveAction::performRedo(Action::state_ptr){
  ASSERT(0,"Cannot redo leaving a menu");
  return Action::failure;
}