/*
 *      Copyright (C) 2005-2013 Team XBMC
 *      http://xbmc.org
 *
 *  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.
 *
 *  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
 *  along with XBMC; see the file COPYING.  If not, see
 *  <http://www.gnu.org/licenses/>.
 *
 */

#include "GUIResizeControl.h"
#include "input/Key.h"
#include "utils/TimeUtils.h"

// time to reset accelerated cursors (digital movement)
#define MOVE_TIME_OUT 500L

CGUIResizeControl::CGUIResizeControl(int parentID, int controlID, float posX, float posY, float width, float height, const CTextureInfo& textureFocus, const CTextureInfo& textureNoFocus)
    : CGUIControl(parentID, controlID, posX, posY, width, height)
    , m_imgFocus(posX, posY, width, height, textureFocus)
    , m_imgNoFocus(posX, posY, width, height, textureNoFocus)
{
  m_frameCounter = 0;
  m_lastMoveTime = 0;
  m_fSpeed = 1.0;
  m_fAnalogSpeed = 2.0f; // TODO: implement correct analog speed
  m_fAcceleration = 0.2f; // TODO: implement correct computation of acceleration
  m_fMaxSpeed = 10.0;  // TODO: implement correct computation of maxspeed
  ControlType = GUICONTROL_RESIZE;
  SetLimits(0, 0, 720, 576); // defaults
  m_nDirection = DIRECTION_NONE;
}

CGUIResizeControl::~CGUIResizeControl(void)
{}

void CGUIResizeControl::Process(unsigned int currentTime, CDirtyRegionList &dirtyregions)
{
  if (m_bInvalidated)
  {
    m_imgFocus.SetWidth(m_width);
    m_imgFocus.SetHeight(m_height);

    m_imgNoFocus.SetWidth(m_width);
    m_imgNoFocus.SetHeight(m_height);
  }
  if (HasFocus())
  {
    unsigned int alphaCounter = m_frameCounter + 2;
    unsigned int alphaChannel;
    if ((alphaCounter % 128) >= 64)
      alphaChannel = alphaCounter % 64;
    else
      alphaChannel = 63 - (alphaCounter % 64);

    alphaChannel += 192;
    if (SetAlpha( (unsigned char)alphaChannel ))
      MarkDirtyRegion();
    m_imgFocus.SetVisible(true);
    m_imgNoFocus.SetVisible(false);
    m_frameCounter++;
  }
  else
  {
    if (SetAlpha(0xff))
      MarkDirtyRegion();
    m_imgFocus.SetVisible(false);
    m_imgNoFocus.SetVisible(true);
  }
  m_imgFocus.Process(currentTime);
  m_imgNoFocus.Process(currentTime);
  CGUIControl::Process(currentTime, dirtyregions);
}

void CGUIResizeControl::Render()
{
  m_imgFocus.Render();
  m_imgNoFocus.Render();
  CGUIControl::Render();
}

bool CGUIResizeControl::OnAction(const CAction &action)
{
  if (action.GetID() == ACTION_SELECT_ITEM)
  {
    // button selected - send message to parent
    CGUIMessage message(GUI_MSG_CLICKED, GetID(), GetParentID());
    SendWindowMessage(message);
    return true;
  }
  if (action.GetID() == ACTION_ANALOG_MOVE)
  {
    Resize(m_fAnalogSpeed*action.GetAmount(), -m_fAnalogSpeed*action.GetAmount(1));
    return true;
  }
  return CGUIControl::OnAction(action);
}

void CGUIResizeControl::OnUp()
{
  UpdateSpeed(DIRECTION_UP);
  Resize(0, -m_fSpeed);
}

void CGUIResizeControl::OnDown()
{
  UpdateSpeed(DIRECTION_DOWN);
  Resize(0, m_fSpeed);
}

void CGUIResizeControl::OnLeft()
{
  UpdateSpeed(DIRECTION_LEFT);
  Resize(-m_fSpeed, 0);
}

void CGUIResizeControl::OnRight()
{
  UpdateSpeed(DIRECTION_RIGHT);
  Resize(m_fSpeed, 0);
}

EVENT_RESULT CGUIResizeControl::OnMouseEvent(const CPoint &point, const CMouseEvent &event)
{
  if (event.m_id == ACTION_MOUSE_DRAG)
  {
    if (event.m_state == 1)
    { // grab exclusive access
      CGUIMessage msg(GUI_MSG_EXCLUSIVE_MOUSE, GetID(), GetParentID());
      SendWindowMessage(msg);
    }
    else if (event.m_state == 3)
    { // release exclusive access
      CGUIMessage msg(GUI_MSG_EXCLUSIVE_MOUSE, 0, GetParentID());
      SendWindowMessage(msg);
    }
    Resize(event.m_offsetX, event.m_offsetY);
    return EVENT_RESULT_HANDLED;
  }
  return EVENT_RESULT_UNHANDLED;
}

void CGUIResizeControl::UpdateSpeed(int nDirection)
{
  if (CTimeUtils::GetFrameTime() - m_lastMoveTime > MOVE_TIME_OUT)
  {
    m_fSpeed = 1;
    m_nDirection = DIRECTION_NONE;
  }
  m_lastMoveTime = CTimeUtils::GetFrameTime();
  if (nDirection == m_nDirection)
  { // accelerate
    m_fSpeed += m_fAcceleration;
    if (m_fSpeed > m_fMaxSpeed) m_fSpeed = m_fMaxSpeed;
  }
  else
  { // reset direction and speed
    m_fSpeed = 1;
    m_nDirection = nDirection;
  }
}

void CGUIResizeControl::AllocResources()
{
  CGUIControl::AllocResources();
  m_frameCounter = 0;
  m_imgFocus.AllocResources();
  m_imgNoFocus.AllocResources();
  m_width = m_imgFocus.GetWidth();
  m_height = m_imgFocus.GetHeight();
}

void CGUIResizeControl::FreeResources(bool immediately)
{
  CGUIControl::FreeResources(immediately);
  m_imgFocus.FreeResources(immediately);
  m_imgNoFocus.FreeResources(immediately);
}

void CGUIResizeControl::DynamicResourceAlloc(bool bOnOff)
{
  CGUIControl::DynamicResourceAlloc(bOnOff);
  m_imgFocus.DynamicResourceAlloc(bOnOff);
  m_imgNoFocus.DynamicResourceAlloc(bOnOff);
}

void CGUIResizeControl::SetInvalid()
{
  CGUIControl::SetInvalid();
  m_imgFocus.SetInvalid();
  m_imgNoFocus.SetInvalid();
}

void CGUIResizeControl::Resize(float x, float y)
{
  float width = m_width + x;
  float height = m_height + y;
  // check if we are within the bounds
  if (width < m_x1) width = m_x1;
  if (height < m_y1) height = m_y1;
  if (width > m_x2) width = m_x2;
  if (height > m_y2) height = m_y2;
  // ok, now set the default size of the resize control
  SetWidth(width);
  SetHeight(height);
}

void CGUIResizeControl::SetPosition(float posX, float posY)
{
  CGUIControl::SetPosition(posX, posY);
  m_imgFocus.SetPosition(posX, posY);
  m_imgNoFocus.SetPosition(posX, posY);
}

bool CGUIResizeControl::SetAlpha(unsigned char alpha)
{
  return m_imgFocus.SetAlpha(alpha) | 
         m_imgNoFocus.SetAlpha(alpha);
}

bool CGUIResizeControl::UpdateColors()
{
  bool changed = CGUIControl::UpdateColors();
  changed |= m_imgFocus.SetDiffuseColor(m_diffuseColor);
  changed |= m_imgNoFocus.SetDiffuseColor(m_diffuseColor);

  return changed;
}

void CGUIResizeControl::SetLimits(float x1, float y1, float x2, float y2)
{
  m_x1 = x1;
  m_y1 = y1;
  m_x2 = x2;
  m_y2 = y2;
}
