/*
 * TextMenu.hpp
 *
 *  Created on: Nov 5, 2010
 *      Author: heber
 */

#ifndef TEXTMENU_HPP_
#define TEXTMENU_HPP_

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


#include <map>
#include <string>

#include "CodePatterns/MemDebug.hpp"

#include "CodePatterns/Log.hpp"
#include "CodePatterns/Verbose.hpp"
#include "Menu/Menu.hpp"
#include "Menu/MenuInterface.hpp"
#include "Actions/Action.hpp"
#include "Actions/ActionQueue.hpp"
#include "Actions/ActionTrait.hpp"
#include "Menu/getLastPosition.hpp"
#include "Menu/TextMenu/TxMenuLeaveAction.hpp"
#include "Menu/TextMenu/ActionMenuItem.hpp"
#include "Menu/TextMenu/SeparatorMenuItem.hpp"
#include "Menu/TextMenu/SubMenuItem.hpp"

/** TextMenu is a specialization of MenuInterface to access TxMenu-like menus.
 *
 * Basically, this class is to be used in the MainWindow class of the TextUI.
 * There, we simply instantiate the class and call init() in order to add all
 * MenuItem's from MenuDescriptions and Action's ActionRegistry.
 *
 * \sa QtMenu.
 */
template <class T>
class TextMenu : virtual public MenuInterface, public Menu
{
public:
  /** Constructor for class TextMenu.
   * Initializes outputter and token and takes note whether to delete the
   * MenuInstance or not.
   */
  TextMenu(std::ostream &_outputter, const std::string &_token) :
    MenuInterface(_token),
    Menu(_token),
    MenuInstance(new T(_outputter, _token)),
    outputter(_outputter),
    deleteMenu(true),
    lastposition(MoleCuilder::ActionQueue::getInstance().getListOfActions())
  {}

  explicit TextMenu(T *_MenuInstance) :
    Menu(_MenuInstance->getTitle()),
    MenuInstance(_MenuInstance),
    outputter(_MenuInstance->getOutputter()),
    deleteMenu(false),
    lastposition(MoleCuilder::ActionQueue::getInstance().getListOfActions())
  {}

  /** Destructor of MenuInstance.
   *
   */
  virtual ~TextMenu()
  {
    ShortcutMap.clear();
    if (deleteMenu)
      delete MenuInstance;
    for (typename SubmenuList::iterator iter = Submenus.begin(); !Submenus.empty(); iter = Submenus.begin()) {
      delete(*iter);
      Submenus.erase(iter);
    }
  }

  /** Display this MenuInstance.
   *
   */
  void display()
  {
    MenuInstance->display();
  }

  /** Returns a pointer to the contained/wrapped MenuInstance.
   * \return pointer to template class pointer
   */
  T * const getMenuInstance()
  {
    return MenuInstance;
  }

  /** Reserves a specific trigger key such that it is not used during init().
   * \param trigger trigger key
   * \param &name token given for reference.
   */
  void reserveShortcut(char trigger, const std::string &name)
  {
    ShortcutMap.insert( std::pair < char, std::string> (trigger, name) );
  }

protected:
  // We need to have a reference of the Menu, as Qt returns reference to added menu as well
  T *MenuInstance;
  std::ostream &outputter;

private:
  bool deleteMenu;

  //!> internal functor to get last used position in menu of actions
  getLastPosition lastposition;

  typedef std::map <char, std::string> MenuShortcutMap;
  MenuShortcutMap ShortcutMap;

  typedef std::list< TextMenu<T> *> SubmenuList;
  SubmenuList Submenus;

  /** Adds an ActionItem by simply creating a new one.
   * \param &token token of Action (token in ActionRegistry)
   * \param &description descriptive text to be shown
   */
  virtual void addActionItem(const std::string &token, const std::string &description)
  {
    new ActionMenuItem(getSuitableShortForm(description), description, MenuInstance, token);
  }

  /** Adds a (dead) separator item.
   *
   */
  virtual void addSeparatorItem()
  {
    new SeparatorMenuItem(MenuInstance);
  }

  /** Adds a Menu to this current Menu.
   * We also create here a leave action for this submenu to be able to return
   * to the current one again
   * \param &token token of the menu
   * \param &description descriptive text
   */
  virtual void addSubmenuItem(const std::string &token, const std::string &description)
  {
    TextMenu<TxMenu> *NewMenu = new TextMenu<TxMenu>(outputter, token);
    Submenus.push_back(NewMenu);
    new SubMenuItem(getSuitableShortForm(description), description, MenuInstance, NewMenu->getMenuInstance());
    NewMenu->reserveShortcut('q',"leave"+token);
    MoleCuilder::ActionTrait leaveTrait(
        MoleCuilder::OptionTrait("leave"+token, &typeid(void), "leave menu "+token),
        token,
        lastposition(token)+2); // have a separator in between
    MoleCuilder::Action *_action = new TxMenu::LeaveAction(NewMenu->getMenuInstance(), leaveTrait);
    MoleCuilder::ActionQueue::getInstance().registerAction(_action);
    NewMenu->init();
    new ActionMenuItem('q',"leave"+token,NewMenu->getMenuInstance(),"leave"+token);
  }

  /** Return the next available trigger key suitable to this name.
   * This function is used internally to make sure that each key is unique to
   * each Action/Menu. The chosen trigger key is also stored in an internal ShortcutMap.
   * \param &name text shown in menu
   * \return trigger key
   */
  char getSuitableShortForm(const std::string &name)
  {
    for (std::string::const_iterator CharRunner = name.begin(); CharRunner != name.end(); ++CharRunner) {
      if (ShortcutMap.find(*CharRunner) == ShortcutMap.end()) {
        ShortcutMap.insert( std::pair < char, std::string> (*CharRunner, name) );
        return *CharRunner;
      }
    }
    // if no letter matches, take digits
    int i=0;
    for (;i<10;++i) {
      if (ShortcutMap.find((char)i + '0') == ShortcutMap.end())
        break;
    }
    if (i != 10) {
      ShortcutMap.insert( std::pair < char, std::string > ((char)i + '0', name));
      return ((char)i + '0');
    } else {
      ELOG(1, "Could not find a suitable shortform for " << name << ".");
      return '#';
    }
  }
};

#endif /* TEXTMENU_HPP_ */