/********************************************************************************************
 * NxWidgets/nxwm/src/cstartwindow.cxx
 *
 *   Copyright (C) 2012 Gregory Nutt. All rights reserved.
 *   Author: Gregory Nutt <gnutt@nuttx.org>
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 * 3. Neither the name NuttX, NxWidgets, nor the names of its contributors
 *    me be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
 * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 *
 ********************************************************************************************/

/********************************************************************************************
 * Included Files
 ********************************************************************************************/

#include <nuttx/config.h>

#include <cstdlib>
#include <cfcntl>
#include <csched>
#include <cerrno>

#include <mqueue.h>

#include "cwidgetcontrol.hxx"

#include "nxwmconfig.hxx"
#include "nxwmglyphs.hxx"
#include "ctaskbar.hxx"
#include "cstartwindow.hxx"

/********************************************************************************************
 * Pre-Processor Definitions
 ********************************************************************************************/

/********************************************************************************************
 * Global Data
 ********************************************************************************************/

/**
 * The well-known name for the Start Window's message queue.
 */

FAR const char *NxWM::g_startWindowMqName = CONFIG_NXWM_STARTWINDOW_MQNAME;
  
/********************************************************************************************
 * CStartWindow Method Implementations
 ********************************************************************************************/

using namespace NxWM;

/**
 * CStartWindow Constructor
 *
 * @param taskbar.  A pointer to the parent task bar instance
 * @param window.  The window to be used by this application.
 */

CStartWindow::CStartWindow(CTaskbar *taskbar, CApplicationWindow *window)
{
  // Save the constructor data

  m_taskbar = taskbar;
  m_window  = window;

  // The start window task is not running

  m_taskId  = -1;

  // Add our personalized window label

  NXWidgets::CNxString myName = getName();
  window->setWindowLabel(myName);

  // Add our callbacks to the application window

  window->registerCallbacks(static_cast<IApplicationCallback *>(this));
}

/**
 * CStartWindow Constructor
 */

CStartWindow::~CStartWindow(void)
{
  // There would be a problem if we were stopped with the start window task
  // running... that should never happen but we'll check anyway:

  stop();

  // Although we didn't create it, we are responsible for deleting the
  // application window

  delete m_window;

  // Then stop and delete all applications

  removeAllApplications();
}

/**
 * Each implementation of IApplication must provide a method to recover
 * the contained IApplicationWindow instance.
 */

IApplicationWindow *CStartWindow::getWindow(void) const
{
  return static_cast<IApplicationWindow*>(m_window);
}

/**
 * Get the icon associated with the application
 *
 * @return An instance if IBitmap that may be used to rend the
 *   application's icon.  This is an new IBitmap instance that must
 *   be deleted by the caller when it is no long needed.
 */

NXWidgets::IBitmap *CStartWindow::getIcon(void)
{
  NXWidgets::CRlePaletteBitmap *bitmap =
    new NXWidgets::CRlePaletteBitmap(&CONFIG_NXWM_STARTWINDOW_ICON);

  return bitmap;
}

/**
 * Get the name string associated with the application
 *
 * @return A copy if CNxString that contains the name of the application.
 */

NXWidgets::CNxString CStartWindow::getName(void)
{
  return NXWidgets::CNxString("Start Window");
}

/**
 * Start the application.
 *
 * @return True if the application was successfully started.
 */

bool CStartWindow::run(void)
{
  // Some sanity checking

  if (m_taskId >= 0)
    {
      // The start window task is already running???

      return false;
    }

  // Start the start window task

  m_taskId = TASK_CREATE("StartWindow", CONFIG_NXWM_STARTWINDOW_PRIO,
                         CONFIG_NXWM_STARTWINDOW_STACKSIZE, startWindow,
                        (FAR const char **)0);

  // Did we successfully start the NxConsole task?

  return m_taskId >= 0;
}

/**
 * Stop the application.
 */

void CStartWindow::stop(void)
{
  // Delete the start window task --- what are we doing?  This should never
  // happen because the start window task is persistent!

  if (m_taskId >= 0)
    {
      // Call task_delete(), possibly stranding resources
 
      pid_t pid = m_taskId;
      m_taskId = -1;

      // Then delete the NSH task

      task_delete(pid);
    }
}
/**
 * Destroy the application and free all of its resources.  This method
 * will initiate blocking of messages from the NX server.  The server
 * will flush the window message queue and reply with the blocked
 * message.  When the block message is received by CWindowMessenger,
 * it will send the destroy message to the start window task which
 * will, finally, safely delete the application.
 */

void CStartWindow::destroy(void)
{
  // What are we doing?  This should never happen because the start
  // window task is persistent!

  // Block any further window messages

  m_window->block(this);

  // Make sure that the application is stopped

  stop();
}

/**
 * The application window is hidden (either it is minimized or it is
 * maximized, but not at the top of the hierarchy
 */

void CStartWindow::hide(void)
{
  // Disable drawing and events on all icons

  for (int i = 0; i < m_slots.size(); i++)
    {
      NXWidgets::CImage *image = m_slots.at(i).image;
      image->disableDrawing();
      image->setRaisesEvents(false);
    }
}

/**
 * Redraw the entire window.  The application has been maximized or
 * otherwise moved to the top of the hiearchy
 */

void CStartWindow::redraw(void)
{
  // Recover the NXTK window instance contained in the application window

  NXWidgets::INxWindow *window = m_window->getWindow();

  // Get the widget control associated with the NXTK window

  NXWidgets::CWidgetControl *control =  window->getWidgetControl();

  // Get the graphics port for drawing on the widget control

  NXWidgets::CGraphicsPort *port = control->getGraphicsPort();

  // Get the size of the application window

  struct nxgl_size_s windowSize;
  if (!window->getSize(&windowSize))
    {
      return;
    }

  // Fill the entire window with the background color

  port->drawFilledRect(0, 0, windowSize.w, windowSize.h,
                       CONFIG_NXWM_DEFAULT_BACKGROUNDCOLOR);

  // Begin adding icons in the upper left corner

  struct nxgl_point_s iconPos;
  iconPos.x = CONFIG_NXWM_STARTWINDOW_HSPACING;
  iconPos.y = CONFIG_NXWM_STARTWINDOW_VSPACING;

  // Add each icon in the list of applications

  for (int i = 0; i < m_slots.size(); i++)
    {
      // Get the icon associated with this application

      NXWidgets::CImage *image = m_slots.at(i).image;

      // Disable drawing of the icon image; disable events from the icon

      image->disableDrawing();
      image->setRaisesEvents(false);

      // Get the size of the icon image

      NXWidgets::CRect rect;
      image->getPreferredDimensions(rect);

      // Center the image in the region defined by the maximum icon size

      struct nxgl_point_s imagePos;
      imagePos.x = iconPos.x;
      imagePos.y = iconPos.y;

      if (rect.getWidth() < m_iconSize.w)
        {
          imagePos.x += ((m_iconSize.w - rect.getWidth()) >> 1);
        }

      if (rect.getHeight() < m_iconSize.h)
        {
          imagePos.y += ((m_iconSize.h - rect.getHeight()) >> 1);
        }

      // Set the position of the icon bitmap

      image->moveTo(imagePos.x, imagePos.y);

      // Then re-draw the icon at the new position

      image->enableDrawing();
      image->redraw();
      image->setRaisesEvents(true);

      // Advance the next icon position to the left

      iconPos.x +=  m_iconSize.w + CONFIG_NXWM_TASKBAR_HSPACING;

      // If there is insufficient space on on this row for the next
      // max-sized icon, then advance to the next row

      if (iconPos.x + m_iconSize.w >= windowSize.w)
        {
          iconPos.x  = CONFIG_NXWM_STARTWINDOW_HSPACING;
          iconPos.y += m_iconSize.h + CONFIG_NXWM_TASKBAR_VSPACING;

          // Don't try drawing past the bottom of the window

          if (iconPos.y >= windowSize.w)
            {
              break;
            }
        }
    }
}

/**
 * Report of this is a "normal" window or a full screen window.  The
 * primary purpose of this method is so that window manager will know
 * whether or not it show draw the task bar.
 *
 * @return True if this is a full screen window.
 */

bool CStartWindow::isFullScreen(void) const
{
  return m_window->isFullScreen();
}

/**
 * Add the application to the start window.  The general sequence is:
 *
 * 1. Call IAppicationFactory::create to a new instance of the application
 * 2. Call CStartWindow::addApplication to add the application to the
 *    start window.
 *
 * @param app.  The new application to add to the start window
 * @return true on success
 */

bool CStartWindow::addApplication(IApplicationFactory *app)
{
  // Recover the NXTK window instance contained in the application window

  NXWidgets::INxWindow *window = m_window->getWindow();

  // Get the widget control associated with the NXTK window

  NXWidgets::CWidgetControl *control =  window->getWidgetControl();

  // Get the bitmap icon that goes with this application

  NXWidgets::IBitmap *bitmap = app->getIcon();

  // Create a CImage instance to manage the application icon

  NXWidgets::CImage *image =
    new NXWidgets::CImage(control, 0, 0, bitmap->getWidth(),
                          bitmap->getHeight(), bitmap, 0);
  if (!image)
    {
      return false;
    }

  // Configure the image, disabling drawing for now

  image->setBorderless(true);
  image->disableDrawing();

  // Register to get events from the mouse clicks on the image

  image->addWidgetEventHandler(this);

  // Add the application to end of the list of applications managed by
  // the start window

  struct SStartWindowSlot slot;
  slot.app   = app;
  slot.image = image;
  m_slots.push_back(slot);

  // Re-calculate the icon bounding box

  getIconBounds();
  return true;
}

/**
 * Simulate a mouse click or release on the icon at index.  This method
 * is only available during automated testing of NxWM.
 *
 * @param index.  Selects the icon in the start window
 * @param click.  True to click and false to release
 */

#if defined(CONFIG_NXWM_UNITTEST) && !defined(CONFIG_NXWM_TOUCHSCREEN)
void CStartWindow::clickIcon(int index, bool click)
{
  if (index < m_slots.size())
   {
      // Get the image widget at this index

      NXWidgets::CImage *image = m_slots.at(index).image;

      // Get the size and position of the widget

      struct nxgl_size_s imageSize;
      image->getSize(imageSize);

      struct nxgl_point_s imagePos;
      image->getPos(imagePos);

      // And click or release the image at its center

      if (click)
        {
          image->click(imagePos.x + (imageSize.w >> 1),
                       imagePos.y + (imageSize.h >> 1));
        }
      else
        {
          image->release(imagePos.x + (imageSize.w >> 1),
                         imagePos.y + (imageSize.h >> 1));
        }
    }
}
#endif

/**
 * Called when the window minimize button is pressed.
 */

void CStartWindow::minimize(void)
{
  m_taskbar->minimizeApplication(static_cast<IApplication*>(this));
}

/**
 * Called when the window minimize close is pressed.
 */

void CStartWindow::close(void)
{
  // Do nothing... you can't close the start window!!!
}

/**
 * Calculate the icon bounding box
 */

void CStartWindow::getIconBounds(void)
{
  // Visit each icon

  struct nxgl_size_s maxSize;
  maxSize.w = 0;
  maxSize.h = 0;

  for (int i = 0; i < m_slots.size(); i++)
    {
      // Get the icon associated with this application

      NXWidgets::CImage *image = m_slots.at(i).image;

      // Get the size of the icon image

      NXWidgets::CRect rect;
      image->getPreferredDimensions(rect);

      // Keep the maximum height and width

      if (rect.getWidth() > maxSize.h)
        {
          maxSize.w = rect.getWidth() ;
        }

      if (rect.getHeight() > maxSize.h)
        {
          maxSize.h = rect.getHeight();
        }
    }

  // And save the new maximum size

  m_iconSize.w = maxSize.w;
  m_iconSize.h = maxSize.h;
}

/**
 * Stop all applications
 */

void CStartWindow::removeAllApplications(void)
{
  // Stop all applications and remove them from the start window.  Clearly, there 
  // are some ordering issues here... On an orderly system shutdown, disconnection
  // should really occur priority to deleting instances

  while (!m_slots.empty())
    {
      // Remove the application factory from the start menu

      IApplicationFactory *app = m_slots.at(0).app;

      // Now, delete the image and the application
 
      delete app;
      delete m_slots.at(0).image;

      // And discard the data in this slot

      m_slots.erase(0);
    }
}

/**
 * Handle a widget action event.  For CImage, this is a mouse button pre-release event.
 *
 * @param e The event data.
 */

void CStartWindow::handleActionEvent(const NXWidgets::CWidgetEventArgs &e)
{
  // Was an ICON clicked?

  for (int i = 0; i < m_slots.size(); i++)
    {
      // Is this the clicked icon?

      NXWidgets::CImage *image = m_slots.at(i).image;
      if (image->isClicked())
        {
          // Create a new copy of the application

          IApplication *app = m_slots.at(i).app->create();
          if (app)
            {
              // Start the new copy of the application

              if (m_taskbar->startApplication(app, false))
                {
                  // Then break out of the loop

                  break;
                }
              else
                {
                  // If we cannot start the app.  Destroy the instance we
                  // created and see what happens next.  Could be interesting.

                  app->stop();
                  app->destroy();
                }
            }
        }
    }
}

/**
 * This is the start window task.  This function receives window events from
 * the NX listener threads indirectly through this sequence:
 *
 * 1. NX listener thread receives a windows event.  This may be a
 *    positional change notification, a redraw request, or mouse or
 *    keyboard input.
 * 2. The NX listener thread performs the callback by calling a
 *    NXWidgets::CCallback method associated with the window.
 * 3. NXWidgets::CCallback calls into NXWidgets::CWidgetControl to process
 *    the event.
 * 4. NXWidgets::CWidgetControl records the new state data and raises a
 *    window event.
 * 5. NXWidgets::CWindowEventHandlerList will give the event to
 *    NxWM::CWindowMessenger.
 * 6. NxWM::CWindowMessenger will send the a message on a well-known message
 *    queue.
 * 7. This CStartWindow::startWindow task will receive and process that
 *    message.
 */

int CStartWindow::startWindow(int argc, char *argv[])
{
  /* Open a well-known message queue for reading */

  struct mq_attr attr;
  attr.mq_maxmsg  = CONFIG_NXWM_STARTWINDOW_MXMSGS;
  attr.mq_msgsize = sizeof(struct SStartWindowMessage);
  attr.mq_flags   = 0;

  mqd_t mqd = mq_open(g_startWindowMqName, O_RDONLY|O_CREAT, 0666, &attr);
  if (mqd == (mqd_t)-1)
    {
      gdbg("ERROR: mq_open(%s) failed: %d\n", g_startWindowMqName, errno);
      return EXIT_FAILURE;
    }

  // Now loop forever, receiving and processing messages.  Ultimately, all
  // widget driven events (button presses, etc.) are driven by this logic
  // on this thread.

  for (;;)
    {
      // Receive the next message

      struct SStartWindowMessage msg;
      ssize_t nbytes = mq_receive(mqd, &msg,  sizeof(struct SStartWindowMessage), 0);
      if (nbytes < 0)
        {
          int errval = errno;

          // EINTR is not an error.  The wait was interrupted by a signal and
          // we just need to try reading again.

          if (errval != EINTR)
            {
              gdbg("ERROR: mq_receive failed: %d\n", errval);
            }
        }
      while (nbytes < 0);

      gvdbg("Received msgid=%d nbytes=%d\n", msg.msgId, nbytes);
      DEBUGASSERT(nbytes = sizeof(struct SStartWindowMessage) && msg.instance);

      // Dispatch the message to the appropriate CWidgetControl and to the
      // appropriate CWidgetControl method

      switch (msg.msgId)
        {
          break;

        case MSGID_MOUSE_INPUT:       // New mouse input is available
        case MSGID_KEYBOARD_INPUT:    // New keyboard input is available
          {
            // Handle all new window input events by calling the CWidgetControl::pollEvents() method

            NXWidgets::CWidgetControl *control = (NXWidgets::CWidgetControl *)msg.instance;
            control->pollEvents();
          }
          break;

        case MSGID_DESTROY_APP:       // Destroy the application
          {
            // Handle all destroy application events

            gdbg("Deleting app=%p\n", msg.instance);
            IApplication *app = (IApplication *)msg.instance;
            delete app;
          }
          break;

        case MSGID_POSITIONAL_CHANGE: // Change in window positional data (not used)
        case MSGID_REDRAW_REQUEST:    // Request to redraw a portion of the window (not used)
        default:
          gdbg("ERROR: Unrecognized or unsupported msgId: %d\n", (int)msg.msgId);
          break;
        }
    }
}