/*
   orxonox - the future of 3D-vertical-scrollers

   Copyright (C) 2004 orx

   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 2, or (at your option)
   any later version.

   ### File Specific:
   main-programmer: Benjamin Grauer
   co-programmer: ...
*/

#define DEBUG_SPECIAL_MODULE 4//DEBUG_MODULE_GUI

#include "glgui_widget.h"

#include "glgui_cursor.h"

#include "material.h"

#include "debug.h"

#include "loading/load_param.h"

namespace OrxGui
{

  /**
   * @brief standard constructor
  */
  GLGuiWidget::GLGuiWidget (GLGuiWidget* parent)
  {
    this->init();

    this->setParentWidget(parent);
  }


  /**
   * @brief loads Parameters for a Style from XML
   * @param root the XML-Element to load from.
   */
  void GLGuiWidget::loadParams(const TiXmlElement* root)
  {

    /// STYLE
    LoadParam(root, "border-left", this, GLGuiWidget, setBorderLeft);
    LoadParam(root, "border-right", this, GLGuiWidget, setBorderRight);
    LoadParam(root, "border-top", this, GLGuiWidget, setBorderTop);
    LoadParam(root, "border-bottom", this, GLGuiWidget, setBorderBottom);

    LoadParam(root, "text-size", this, GLGuiWidget, setTextSize);
    LoadParam(root, "background-color", this, GLGuiWidget, setBackgroundColorS);
    LoadParam(root, "foreground-color", this, GLGuiWidget, setForegroundColorS);

    //    LoadParamXML(root, "backmat", this, GLGuiWidget, loadBackgroundMaterial);
    //    LoadParamXML(root, "frontmat", this, GLGuiWidget, loadForegroundMaterial);

    LoadParam(root, "feature-position", this, GLGuiWidget, setFeaturePositionS);
    LoadParam(root, "Font", this, GLGuiWidget, setFont);

    LoadParam(root, "animated-state-changes", this, GLGuiWidget, setAnimatedStateChanges);
  }


  /**
   * @brief standard deconstructor
   */
  GLGuiWidget::~GLGuiWidget()
  {
    if (this == GLGuiWidget::_mouseFocused)
      GLGuiWidget::_mouseFocused = NULL;
    if (this == GLGuiWidget::selected())
      this->unselect();
  }

  GLGuiWidget* GLGuiWidget::_selected = NULL;
  GLGuiWidget* GLGuiWidget::_mouseFocused = NULL;
  GLGuiWidget* GLGuiWidget::_inputGrabber = NULL;



  /**
   * initializes the GUI-element
   */
  void GLGuiWidget::init()
  {
    this->setClassID(CL_GLGUI_WIDGET, "GLGuiWidget");

    this->_focusable = false;
    this->_clickable = false;
    this->_selectable = false;
    this->_pushed = false;
    this->_state = OrxGui::Normal;


    this->_font = NULL;
    this->resetStyle();

    this->_animating = false;
    this->_animationCycle = 0.0;
    this->_animationDuration = 1.0;


    this->setBackgroundColor(Color(.51, .3, .3, .5));
    this->setBackgroundColor(Color(.3, .5, .3, 1), OrxGui::Selected);
    this->_style[0]._background.setBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    this->_style[1]._background.setBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    this->_style[2]._background.setBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);
    this->_style[3]._background.setBlendFunc( GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA);

    this->setForegroundColor(Color(1, 0, 0, 1), OrxGui::Normal);
    this->setForegroundColor(Color(0, 0, 1, 1), OrxGui::Selected);
    this->setForegroundColor(Color(0, 1, 0, 1), OrxGui::Focused);
    this->setForegroundColor(Color(.1, .1, .1, 1), OrxGui::Insensitive);

    this->setVisibility(GLGUI_WIDGET_DEFAULT_VISIBLE);

    this->setBorderLeft(15);
    this->setBackgroundTexture("gui_element_background.png");

    this->switchState(_state);
    this->_currentStyle = this->_style[_state];
  }


  void GLGuiWidget::setParentWidget(GLGuiWidget* parent)
  {
    this->_parent = parent;

    if (parent != NULL)
      parent->addChild2D(this);
  }


  void GLGuiWidget::setFrontColor(const Color& frontColor, bool instantaniously)
  {
    this->_currentStyle._foreground.setDiffuseColor(frontColor);
    this->animateBack();
  };


  bool GLGuiWidget::focusOverWidget(const Vector2D& position) const
  {
    return (this->getAbsCoor2D().x < position.x && this->getAbsCoor2D().x + this->getSizeX2D() > position.x &&
        this->getAbsCoor2D().y < position.y && this->getAbsCoor2D().y + this->getSizeY2D() > position.y);
  }

  bool GLGuiWidget::focusOverWidget(const GLGuiCursor* const cursor) const
  {
    return this->focusOverWidget(cursor->getAbsCoor2D());
  }



  /** @brief gives focus to this widget */
  void GLGuiWidget::giveMouseFocus()
  {
    if (this->_state == OrxGui::Insensitive)
      return ;

    if (GLGuiWidget::mouseFocused() != NULL)
      GLGuiWidget::mouseFocused()->breakMouseFocus();
    GLGuiWidget::_mouseFocused = this;

    this->switchState(OrxGui::Focused);

    this->receivedFocus();
  };

  void GLGuiWidget::breakMouseFocus()
  {
    if (GLGuiWidget::_mouseFocused == this)
    {
      GLGuiWidget::_mouseFocused = NULL;

      if (GLGuiWidget::_selected != this)
        this->switchState(OrxGui::Normal);
      else
        this->switchState(OrxGui::Selected);

      this->removedFocus();
    }
  };

  /**
   * @brief selects the Widget, unselecting the old one (if existing)
   */
  void GLGuiWidget::select()
  {
    if (GLGuiWidget::_selected != NULL)
      GLGuiWidget::selected()->unselect();
    GLGuiWidget::_selected = this;

    this->switchState(OrxGui::Selected);
  }

  /**
   * @brief unselects the current Widget.
   *
   * if the current Widget is not selected, nothing is done here.
   */
  void GLGuiWidget::unselect()
  {
    if (GLGuiWidget::_selected != this)
      return;

    if (GLGuiWidget::_mouseFocused == this)
      this->switchState(OrxGui::Focused);
    else
      this->switchState(OrxGui::Normal);

    GLGuiWidget::_selected = NULL;
  }


  void GLGuiWidget::resize()
  {
    this->backRect().setSize(this->getSize2D());
    if (this->parent() != NULL)
      this->parent()->resize();
  }


  void GLGuiWidget::click(const Vector2D& pos)
  {
    assert (!this->_pushed);
    this->_pushed = true;

    this->clicking(pos);
  }

  void GLGuiWidget::release(const Vector2D& pos)
  {
    if (this->_pushed)
    {
      this->releasing(pos, GLGuiWidget::_mouseFocused == this);
      this->_pushed = false;
    }
  }


  void GLGuiWidget::clicking(const Vector2D& pos)
  {}

  void GLGuiWidget::releasing(const Vector2D& pos, bool focused)
  {}

  void GLGuiWidget::receivedFocus()
  {
  }

  void GLGuiWidget::removedFocus()
  {

  }

  void GLGuiWidget::selecting()
  {
  }

  void GLGuiWidget::unselecting()
  {
  }


  void GLGuiWidget::destroying()
  {
  }


  void GLGuiWidget::setWidgetSize(const Vector2D& size)
  {
    this->setSize2D(size);
    this->resize();

  }


  void GLGuiWidget::setWidgetSize(float x, float y)
  {
    this->setWidgetSize(Vector2D(x, y));
  }



  void GLGuiWidget::connect(GLGuiWidget* sender, Signal& signal, BaseObject* receiver, Slot executor)
  {
    sender->connect(signal, receiver, executor);
  }

  void GLGuiWidget::connect(Signal& signal, BaseObject* receiver, Slot executor)
  {
    signal.push_back(SignalConnector(receiver, executor));
  }


  void GLGuiWidget::show()
  {
    this->setVisibility(true);
    this->showing();
  }



  void GLGuiWidget::hide()
  {
    this->setVisibility(false);
    this->hiding();
  }


  /**
   * @brief resets the Style to the default Settings.
   */
  void GLGuiWidget::resetStyle()
  {
    this->setBorderLeft(1.0);
    this->setBorderRight(1.0);
    this->setBorderTop(1.0);
    this->setBorderBottom(1.0);

    this->setTextSize(20.0);
    this->setBackgroundColor(1.0);
    this->setForegroundColor(1.0);

    this->setFeaturePosition(FeatureLeft);
    this->setFont(NULL);

    this->setAnimatedStateChanges(true);
  }


  /**
   * @brief sets the Width of the left border for all States
   * @param value the borderWidth
   */
  void GLGuiWidget::setBorderLeft(float value)
  {
    for (unsigned int i = 0; i < GLGUI_STATE_COUNT; ++i)
      setBorderLeft(value, (OrxGui::State)i);
  }

  /**
   * @brief sets the Width of the left border.
   * @param value the borderWidth
   * @param state the State to set the borderwidth to
   */
  void GLGuiWidget::setBorderLeft(float value, OrxGui::State state)
  {
    _style[state]._borderLeft = value;
    if (state == _state)
      _currentStyle._borderLeft = value;
  }

  /**
   * @brief sets the Width of the left border.
   * @param value the borderWidth
   * @param stateName the State to set the borderwidth to
   */
  void GLGuiWidget::setBorderLeftS(float value, const std::string& stateName)
  {
    OrxGui::State state;
    if (getState(stateName, &state))
      this->setBorderLeft(value, state);
    else
      this->setBorderLeft(value);
  }

  /**
   * @brief sets the Width of the right border for all states.
   * @param value the borderWidth
   */
  void GLGuiWidget::setBorderRight(float value)
  {
    for (unsigned int i = 0; i < GLGUI_STATE_COUNT; ++i)
      setBorderRight(value, (OrxGui::State)i);
  }

  /**
   * @brief sets the Width of the right border.
   * @param value the borderWidth
   * @param state the State to setup.
   */
  void GLGuiWidget::setBorderRight(float value, OrxGui::State state)
  {
    _style[state]._borderRight = value;
    if (state == _state)
      _currentStyle._borderRight = value;
  }

  /**
   * @brief sets the Width of the right border.
   * @param value the borderWidth
   * @param stateName the State to setup.
   */
  void GLGuiWidget::setBorderRightS(float value, const std::string& stateName)
  {
    OrxGui::State state;
    if (getState(stateName, &state))
      this->setBorderRight(value, state);
    else
      this->setBorderRight(value);
  }


  /**
   * @brief sets the Width of the top border for all states.
   * @param value the borderWidth
   */
  void GLGuiWidget::setBorderTop(float value)
  {
    for (unsigned int i = 0; i < GLGUI_STATE_COUNT; ++i)
      setBorderTop(value, (OrxGui::State)i);
  }

  /**
   * @brief sets the Width of the top border.
   * @param value the borderWidth
   * @param state the State to setup.
   */
  void GLGuiWidget::setBorderTop(float value, OrxGui::State state)
  {
    _style[state]._borderTop = value;
    if (state == _state)
      _currentStyle._borderTop = value;
  }

  /**
   * @brief sets the Width of the top border.
   * @param value the borderWidth
   * @param stateName the State to setup.
   */
  void GLGuiWidget::setBorderTopS(float value, const std::string& stateName)
  {
    OrxGui::State state;
    if (getState(stateName, &state))
      this->setBorderTop(value, state);
    else
      this->setBorderTop(value);
  }


  /**
   * @brief sets the Width of the bottom border for all states.
   * @param value the borderWidth
   */
  void GLGuiWidget::setBorderBottom(float value)
  {
    for (unsigned int i = 0; i < GLGUI_STATE_COUNT; ++i)
      setBorderBottom(value, (OrxGui::State)i);
  }

  /**
   * @brief sets the Width of the bottom border.
   * @param value the borderWidth
   * @param state the State to setup.
   */
  void GLGuiWidget::setBorderBottom(float value, OrxGui::State state)
  {
    _style[state]._borderBottom = value;
    if (state == _state)
      _currentStyle._borderBottom = value;

  }

  /**
   * @brief sets the Width of the bottom border for all states.
   * @param value the borderWidth
   * @param stateName the State to setup.
   */
  void GLGuiWidget::setBorderBottomS(float value, const std::string& stateName)
  {
    OrxGui::State state;
    if (getState(stateName, &state))
      this->setBorderBottom(value, state);
    else
      this->setBorderBottom(value);
  }


  /**
   * @brief sets the TextSize for all states.
   * @param value the TextSize
   */
  void GLGuiWidget::setTextSize(float value)
  {
    for (unsigned int i = 0; i < GLGUI_STATE_COUNT; ++i)
      setTextSize(value, (OrxGui::State)i);
  }

  /**
   * @brief sets the TextSize.
   * @param value the TextSize.
   * @param state: the State to setup
   */
  void GLGuiWidget::setTextSize(float value, OrxGui::State state)
  {
    _style[state]._textSize = value;
    if (state == _state)
      _currentStyle._textSize = value;
  }

  /**
   * @brief sets the TextSize.
   * @param value the TextSize.
   * @param stateName: the State to setup
   */
  void GLGuiWidget::setTextSizeS(float value, const std::string& stateName)
  {
    OrxGui::State state;
    if (getState(stateName, &state))
      this->setTextSize(value, state);
    else
      this->setTextSize(value);
  }


  /**
   * @brief sets the Background Color for all States.
   * @param color the Color.
   */
  void GLGuiWidget::setBackgroundColor(const Color& color)
  {
    for (unsigned int i = 0; i < GLGUI_STATE_COUNT; ++i)
      setBackgroundColor(color, (OrxGui::State)i);
  }

  /**
   * @brief sets the Background Color.
   * @param color the Color.
   * @param state: the State to setup
   */
  void GLGuiWidget::setBackgroundColor(const Color& color, OrxGui::State state)
  {
    _style[state]._background.setDiffuseColor(color);
    if (state == _state)
      _currentStyle._background.setDiffuseColor(color);

  }

  /**
   * @brief sets the Background Color.
   * @param r the Color's red part.
   * @param g the Color's green part.
   * @param b the Color's blue part.
   * @param a the Color's alpha part.
   * @param stateName: the State to setup
   */
  void GLGuiWidget::setBackgroundColorS(float r, float g, float b, float a, const std::string& stateName)
  {
    OrxGui::State state;
    if (getState(stateName, &state))
      this->setBackgroundColor(Color(r,g,b,a), state);
    else
      this->setBackgroundColor(Color(r,g,b,a));
  }


  /**
   * @brief sets the Background Texture for all States.
   * @param texture the Texture.
   */
  void GLGuiWidget::setBackgroundTexture(const Texture& texture)
  {
    for (unsigned int i = 0; i < GLGUI_STATE_COUNT; ++i)
      setBackgroundTexture(texture, (OrxGui::State)i);
  }

  /**
  * @brief sets the Background Texture to all States.
  * @param textureName the Texture's fileName.
   */
  void GLGuiWidget::setBackgroundTexture(const std::string& textureName)
  {
    for (unsigned int i = 0; i < GLGUI_STATE_COUNT; ++i)
      _style[i]._background.setDiffuseMap(textureName);
    this->_currentStyle._background.setDiffuseMap(textureName);
  }

  /**
   * @brief sets the Background Texture.
   * @param texture the Texture.
   * @param state the State to setup.
   */
  void GLGuiWidget::setBackgroundTexture(const Texture& texture, OrxGui::State state)
  {
    _style[state]._background.setDiffuseMap(texture);
    if (state == _state)
      _currentStyle._background.setDiffuseMap(texture);
  }



  /**
   * @brief sets the Background Texture.
   * @param texture the Texture.
   * @param stateName the State to setup.
   */
  void GLGuiWidget::setBackgroundTexture(const std::string& textureName, const std::string& stateName)
  {
    OrxGui::State state;
    if (getState(stateName, &state))
      ; /// FIXME this->setBackgroundTexture(textureName, state);
    else
      ; ///    this->setBackgroundTexture(textureName);
  }


  /**
   * @brief sets the Foreground Color for all States.
   * @param color the Color.
   */
  void GLGuiWidget::setForegroundColor(const Color& color)
  {
    for (unsigned int i = 0; i < GLGUI_STATE_COUNT; ++i)
      setForegroundColor(color, (OrxGui::State)i);
  }

  /**
   * @brief sets the Foreground Color.
   * @param color the Color.
   * @param state the State to setup
   */
  void GLGuiWidget::setForegroundColor(const Color& color, OrxGui::State state)
  {
    _style[state]._foreground.setDiffuseColor(color);
    if (state == _state)
      _currentStyle._foreground.setDiffuseColor(color);

  }

  /**
   * @brief sets the Foreground Color.
   * @param r the Color's red part.
   * @param g the Color's green part.
   * @param b the Color's blue part.
   * @param a the Color's alpha part.
   * @param stateName: the State to setup
   */
  void GLGuiWidget::setForegroundColorS(float r, float g, float b, float a, const std::string& stateName)
  {
    OrxGui::State state;
    if (getState(stateName, &state))
      this->setForegroundColor(Color(r,g,b,a), state);
    else
      this->setForegroundColor(Color(r,g,b,a));
  }


  void GLGuiWidget::loadBackgroundMaterial(const Material& material)
  {
    for (unsigned int i = 0; i < GLGUI_STATE_COUNT; ++i)
      this->loadForegroundMaterial(material, (OrxGui::State)i);
  }

  void GLGuiWidget::loadBackgroundMaterial(const Material& material, OrxGui::State state)
  {
    this->_style[state]._background = material;
    if (state == _state)
      _currentStyle._background = material;

  }

  void GLGuiWidget::loadBackgroundMaterial(const TiXmlElement* element)
  {
    for (unsigned int i = 0; i < GLGUI_STATE_COUNT; ++i)
      this->loadBackgroundMaterial(element, (OrxGui::State)i);
  }

  void GLGuiWidget::loadBackgroundMaterial(const TiXmlElement* element, OrxGui::State state)
  {
    this->_style[state]._background.loadParams(element);
    if (state == _state)
      this->_currentStyle._background = _style[state]._background;
  }

  void GLGuiWidget::loadBackgroundMaterialS(const TiXmlElement* element, const std::string& stateName)
  {
    OrxGui::State state;
    if (getState(stateName, &state))
      this->loadBackgroundMaterial(element, state);
    else
      this->loadBackgroundMaterial(element);
  }

  void GLGuiWidget::loadForegroundMaterial(const Material& material)
{}
  void GLGuiWidget::loadForegroundMaterial(const Material& material, OrxGui::State state)
  {}
  void GLGuiWidget::loadForegroundMaterial(const TiXmlElement* element, OrxGui::State state)
  {}
  void GLGuiWidget::loadForegroundMaterialS(const TiXmlElement* element, const std::string& stateName)
  {}


  /**
   * @brief sets the Feature-Position.
   * @param featurePosition the Feature-Position.
   */
  void GLGuiWidget::setFeaturePosition(FeaturePosition featurePosition)
  {
    this->_featurePosition = featurePosition;
  }

  /**
   * @brief sets the Feature-Position by converting from a String.
   * @param featurePosition the Feature-Position.
   */
  void GLGuiWidget::setFeaturePositionS(const std::string& featurePosition)
  {
    for (unsigned int i = 0; i < 4; ++i)
    {
      if (featurePosition == FeaturePositionString[i])
      {
        this->setFeaturePosition((FeaturePosition)i);
      }
    }
  }

  /**
   * @brief sets the Font.
   * @param font the Font.
   */
  void GLGuiWidget::setFont(Font* font)
  {
    this->_font = font;
  }

  /**
   * @brief sets the font from a Font-Name.
   * @param fontName the FileName of the Font.
   */
  void GLGuiWidget::setFont(const std::string& fontName)
  {
    //this->font = new Font(fontName);
  }

  /**
   * @brief sets the AnimatedState.
   * @param animated: it states-changes should animate true, otherwise false.
   */
  void GLGuiWidget::setAnimatedStateChanges(bool animated)
  {
    this->_animatedStateChanges = animated;
  }


  void GLGuiWidget::switchState(OrxGui::State state)
  {
    //this->_currentStyle = this->_style[state];
    this->_state = state;
    PRINTF(3)("%s::%s Switches to state %s\n", this->getClassName(), this->getName(), OrxGui::StateString[state].c_str());

    this->animateBack();
  }


  void GLGuiWidget::animateBack()
  {
    this->_animating = true;
    this->_animationCycle = 0.0f;
  }


  void GLGuiWidget::tick(float dt)
  {
    if (this->_animating)
    {
      this->foregroundColor();

      _animationCycle += dt / _animationDuration;
      if (_animationCycle >= 1.0)
      {
        _currentStyle._foreground.diffuseColor() = this->foregroundColor(_state);
        _currentStyle._background.diffuseColor() = this->backgroundColor(_state);
        _animating = false;
      }
      else
      {
        _currentStyle._foreground.diffuseColor().slerp(this->foregroundColor(_state), _animationCycle);
        _currentStyle._background.diffuseColor().slerp(this->backgroundColor(_state), _animationCycle);
      }
      this->updateFrontColor();
    }
  }


  /**
   * USE THIS FUNCTION ONLY FROM DERIVED CLASS
   */
  void GLGuiWidget::draw() const
  {
    this->background().select();
    this->drawRect(this->backRect());
    this->background().unselect();
  }


  /**
   * @param stateName the Name of a State.
   * @param state the found State is returned here if found.
   * @returns true if String is found, false otherwise.
   */
  bool GLGuiWidget::getState(const std::string& stateName, OrxGui::State* state)
  {
    for (unsigned int i = 0; i < GLGUI_STATE_COUNT; ++i)
      if (stateName == OrxGui::StateString[i])
      {
        *state = (OrxGui::State)i;
        return true;
      }
    return false;
  }

  /**
   * @brief print out some nice debug output about the Widget.
   */
  void GLGuiWidget::debug(unsigned int level) const
  {
    PRINT(0)("Debug of %s::%s - WidgetPart ", this->getClassName(), this->getName());
    if (_parent != NULL)
      PRINT(0)("- Parent %s::%s ", _parent->getClassName(), _parent->getName());
    PRINT(0)("- State: %s", StateString[_state].c_str());

    if (_focusable)
      PRINT(0)("- focusable ");
    if (_clickable)
      PRINT(0)("- Clickable ");
    if (_pushed)
      PRINT(0)("- Pushed ");
    PRINT(0)("\n");


    PRINT(0)("Minimum Size %0.2f %0.2f ", _minSize.x, _minSize.y);
    PRINT(0)("Back Rect: ");
    _backRect.debug();
    PRINT(0)("Style:\n");

    for (unsigned int i = 0; i < GLGUI_STATE_COUNT; ++i)
    {
      PRINT(0)("In State %s: \n", StateString[i].c_str());

      PRINT(0)("  Borders: Left: %0.2f, Right: %0.2f, Top: %0.2f, Bottom %0.2f\n",
               _style[i]._borderLeft, _style[i]._borderRight, _style[i]._borderTop, _style[i]._borderBottom);
      PRINT(0)("  TextSize %0.2f\n", _style[i]._textSize);
      PRINT(0)("  BackgroundColor: "); _style[i]._background.diffuseColor().debug();
      PRINT(0)("  ForegroundColor: "); _style[i]._foreground.diffuseColor().debug();
      PRINT(0)("\n");
    }


    PRINT(0)(" Feature at %s ", FeaturePositionString[_featurePosition].c_str());
    /// TODO    PRINT(0)("");    Font*               _font;                 //!< The Font used in the current Widget.

    if (_animatedStateChanges)
      PRINT(0)("- AnimatedStateChanges");
    PRINT(0)("\n");

    /*
    if (_animating)
      PRINT(0)("- Animated ");

    //
    float               _animationCycle;
    float               _animationDuration;
    StatedStyle         _currentStyle;
    OrxGui::State       _currentState;
    */
  }


}