/*
  OpenMW - The completely unofficial reimplementation of Morrowind
  Copyright (C) 2008  Nicolay Korslund
  Email: < korslund@gmail.com >
  WWW: http://openmw.snaptoad.com/

  This file (cpp_console.cpp) is part of the OpenMW package.

  OpenMW is distributed as free software: you can redistribute it
  and/or modify it under the terms of the GNU General Public License
  version 3, as published by the Free Software Foundation.

  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
  version 3 along with this program. If not, see
  http://www.gnu.org/licenses/ .

 */

// These are defined in gui/gui.d. At some point later we will just
// use the C++ bindings included with Monster, but these don't cover
// the console stuff yet.
enum
  {
    CR_OK = 1,      // Command was executed
    CR_ERROR = 2,   // An error occured
    CR_MORE = 3,    // More input is needed
    CR_EMPTY = 4    // The line had no effect
  };

#include <list>

extern "C" int32_t console_input(const char* command);
extern "C" char* console_output();

class Console : public Layout
{
public:
  MyGUI::EditPtr command;
  MyGUI::EditPtr history;

  typedef std::list<Ogre::UTFString> StringList;

  // History of previous entered commands
  StringList command_history;
  StringList::iterator current;
  Ogre::UTFString editString;

  Console()
    : Layout("openmw_console_layout.xml")
  {
    setCoord(10,10,
             mWindow->getWidth()*2/3, mWindow->getHeight()/2);

    getWidget(command, "edit_Command");
    getWidget(history, "list_History");

    // Set up the command line box
    command->eventEditSelectAccept =
      newDelegate(this, &Console::acceptCommand);
    command->eventKeyButtonPressed =
      newDelegate(this, &Console::keyPress);

    // Set up the log window
    history->setOverflowToTheLeft(true);
    history->setEditStatic(true);
    history->setVisibleVScroll(true);
  }

  void takeFocus()
  {
    // Give keyboard focus to the combo box whenever the console is
    // turned on
    MyGUI::InputManager::getInstance().setKeyFocusWidget(command);
  }

  void keyPress(MyGUI::WidgetPtr _sender,
                MyGUI::KeyCode key,
                MyGUI::Char _char)
  {
    if(command_history.empty()) return;

    // Traverse history with up and down arrows
    if(key == MyGUI::KeyCode::ArrowUp)
      {
        // If the user was editing a string, store it for later
        if(current == command_history.end())
          editString = command->getCaption();

        if(current != command_history.begin())
          {
            current--;
            command->setCaption(*current);
          }
      }
    else if(key == MyGUI::KeyCode::ArrowDown)
      {
        if(current != command_history.end())
          {
            current++;

            if(current != command_history.end())
              command->setCaption(*current);
            else
              // Restore the edit string
              command->setCaption(editString);
          }
      }
  }


  void acceptCommand(MyGUI::EditPtr _sender)
  {
    const Ogre::UTFString &cm = command->getCaption();
    if(cm.empty()) return;

    // Add the command to the history, and set the current pointer to
    // the end of the list
    command_history.push_back(cm);
    current = command_history.end();
    editString.clear();

    // Log the command and result
    history->addText("#FFFFFF> " + cm + "\n");

    int res = console_input(cm.asUTF8_c_str());
    Ogre::UTFString out = console_output();

    if(res == CR_OK)
      history->addText("#FF00FF" + out);
    else if(res == CR_ERROR)
      history->addText("#FF2222" + out);
    else if(res == CR_MORE)
      history->addText("#1111FF... more input needed\n");

  exit:
    command->setCaption("");
  }
};

Console *cons;

extern "C" void gui_setConsoleFont(const char* fntName)
{
  cons->history->setFontName(fntName);
}

extern "C" void gui_clearConsole()
{
  cons->history->setCaption("");
}

extern "C" void gui_toggleConsole()
{
  if(consoleMode)
    {
      leaveGui();
      if(cons)
        cons->setVisible(false);
    }
  else
    {
      enterGui();
      if(cons)
        {
          cons->setVisible(true);
          cons->takeFocus();
        }
    }

  consoleMode = !consoleMode;
}