/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2013 CERN
 * @author Tomasz Wlostowski <tomasz.wlostowski@cern.ch>
 *
 * 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
 * of the License, 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 this program; if not, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

#include <wx/wx.h>
#include <wx/frame.h>
#include <wx/window.h>
#include <wx/event.h>
#include <wx/colour.h>
#include <wx/filename.h>

#include <class_drawpanel_gal.h>
#include <view/view.h>
#include <view/wx_view_controls.h>
#include <pcb_painter.h>

#include <gal/graphics_abstraction_layer.h>
#include <gal/opengl/opengl_gal.h>
#include <gal/cairo/cairo_gal.h>

#include <tool/tool_dispatcher.h>
#include <tool/tool_manager.h>

#ifdef __WXDEBUG__
#include <profile.h>
#endif /* __WXDEBUG__ */

#define METRIC_UNIT_LENGTH (1e9)

EDA_DRAW_PANEL_GAL::EDA_DRAW_PANEL_GAL( wxWindow* aParentWindow, wxWindowID aWindowId,
                                        const wxPoint& aPosition, const wxSize& aSize,
                                        GalType aGalType ) :
    wxWindow( aParentWindow, aWindowId, aPosition, aSize )
{
    m_gal        = NULL;
    m_currentGal = GAL_TYPE_NONE;
    m_view       = NULL;
    m_painter    = NULL;
    m_eventDispatcher = NULL;

    SwitchBackend( aGalType );
    SetBackgroundStyle( wxBG_STYLE_CUSTOM );

    // Initial display settings
    m_gal->SetLookAtPoint( VECTOR2D( 0, 0 ) );
    m_gal->SetZoomFactor( 1.0 );
    m_gal->ComputeWorldScreenMatrix();

    m_painter = new KIGFX::PCB_PAINTER( m_gal );

    m_view = new KIGFX::VIEW( true );
    m_view->SetPainter( m_painter );
    m_view->SetGAL( m_gal );

    m_viewControls = new KIGFX::WX_VIEW_CONTROLS( m_view, this );

    Connect( wxEVT_PAINT,       wxPaintEventHandler( EDA_DRAW_PANEL_GAL::onPaint ), NULL, this );
    Connect( wxEVT_SIZE,        wxSizeEventHandler( EDA_DRAW_PANEL_GAL::onSize ), NULL, this );

    /* Generic events for the Tool Dispatcher */
    Connect( wxEVT_MOTION,          wxEventHandler( EDA_DRAW_PANEL_GAL::onEvent ), NULL, this );
    Connect( wxEVT_LEFT_UP,         wxEventHandler( EDA_DRAW_PANEL_GAL::onEvent ), NULL, this );
    Connect( wxEVT_LEFT_DOWN,       wxEventHandler( EDA_DRAW_PANEL_GAL::onEvent ), NULL, this );
    Connect( wxEVT_LEFT_DCLICK,     wxEventHandler( EDA_DRAW_PANEL_GAL::onEvent ), NULL, this );
    Connect( wxEVT_RIGHT_UP,        wxEventHandler( EDA_DRAW_PANEL_GAL::onEvent ), NULL, this );
    Connect( wxEVT_RIGHT_DOWN,      wxEventHandler( EDA_DRAW_PANEL_GAL::onEvent ), NULL, this );
    Connect( wxEVT_RIGHT_DCLICK,    wxEventHandler( EDA_DRAW_PANEL_GAL::onEvent ), NULL, this );
    Connect( wxEVT_MIDDLE_UP,       wxEventHandler( EDA_DRAW_PANEL_GAL::onEvent ), NULL, this );
    Connect( wxEVT_MIDDLE_DOWN,     wxEventHandler( EDA_DRAW_PANEL_GAL::onEvent ), NULL, this );
    Connect( wxEVT_MIDDLE_DCLICK,   wxEventHandler( EDA_DRAW_PANEL_GAL::onEvent ), NULL, this );
    Connect( wxEVT_MOUSEWHEEL,      wxEventHandler( EDA_DRAW_PANEL_GAL::onEvent ), NULL, this );
    Connect( wxEVT_CHAR_HOOK,       wxEventHandler( EDA_DRAW_PANEL_GAL::skipEvent ) );
    Connect( wxEVT_KEY_UP,          wxEventHandler( EDA_DRAW_PANEL_GAL::onEvent ), NULL, this );
    Connect( wxEVT_KEY_DOWN,        wxEventHandler( EDA_DRAW_PANEL_GAL::onEvent ), NULL, this );
    Connect( wxEVT_ENTER_WINDOW,    wxEventHandler( EDA_DRAW_PANEL_GAL::onEnter ), NULL, this );
    Connect( KIGFX::WX_VIEW_CONTROLS::EVT_REFRESH_MOUSE,
             wxEventHandler( EDA_DRAW_PANEL_GAL::onEvent ), NULL, this );

    // Set up timer that prevents too frequent redraw commands
    m_refreshTimer.SetOwner( this );
    m_pendingRefresh = false;
    m_drawing = false;
    Connect( wxEVT_TIMER, wxTimerEventHandler( EDA_DRAW_PANEL_GAL::onRefreshTimer ), NULL, this );

    this->SetFocus();
}


EDA_DRAW_PANEL_GAL::~EDA_DRAW_PANEL_GAL()
{
    if( m_painter )
        delete m_painter;

    if( m_viewControls )
        delete m_viewControls;

    if( m_view )
        delete m_view;

    if( m_gal )
        delete m_gal;
}


void EDA_DRAW_PANEL_GAL::onPaint( wxPaintEvent& WXUNUSED( aEvent ) )
{
    m_pendingRefresh = false;
    m_lastRefresh = wxGetLocalTimeMillis();

    if( !m_drawing )
    {
        m_drawing = true;

        m_gal->BeginDrawing();
        m_gal->SetBackgroundColor( KIGFX::COLOR4D( 0.0, 0.0, 0.0, 1.0 ) );
        m_gal->ClearScreen();

        m_view->ClearTargets();
        // Grid has to be redrawn only when the NONCACHED target is redrawn
        if( m_view->IsTargetDirty( KIGFX::TARGET_NONCACHED ) )
            m_gal->DrawGrid();
        m_view->Redraw();
        m_gal->DrawCursor( m_viewControls->GetCursorPosition() );

        m_gal->EndDrawing();

        m_drawing = false;
    }
}


void EDA_DRAW_PANEL_GAL::onSize( wxSizeEvent& aEvent )
{
    m_gal->ResizeScreen( aEvent.GetSize().x, aEvent.GetSize().y );
    m_view->MarkTargetDirty( KIGFX::TARGET_CACHED );
    m_view->MarkTargetDirty( KIGFX::TARGET_NONCACHED );
}


void EDA_DRAW_PANEL_GAL::onRefreshTimer( wxTimerEvent& aEvent )
{
    wxPaintEvent redrawEvent;
    wxPostEvent( this, redrawEvent );
}


void EDA_DRAW_PANEL_GAL::Refresh( bool eraseBackground, const wxRect* rect )
{
    if( m_pendingRefresh )
        return;

    wxLongLong t = wxGetLocalTimeMillis();
    wxLongLong delta = t - m_lastRefresh;

    if( delta >= MinRefreshPeriod )
    {
        wxPaintEvent redrawEvent;
        wxPostEvent( this, redrawEvent );
        m_pendingRefresh = true;
    }
    else
    {
        // One shot timer
        m_refreshTimer.Start( ( MinRefreshPeriod - delta ).ToLong(), true );
        m_pendingRefresh = true;
    }
}


void EDA_DRAW_PANEL_GAL::SwitchBackend( GalType aGalType )
{
    // Protect from refreshing during backend switch
    m_pendingRefresh = true;
    m_refreshTimer.Stop();

    // Do not do anything if the currently used GAL is correct
    if( aGalType == m_currentGal && m_gal != NULL )
        return;

    delete m_gal;

    switch( aGalType )
    {
    case GAL_TYPE_OPENGL:
        m_gal = new KIGFX::OPENGL_GAL( this, this, this );
        break;

    case GAL_TYPE_CAIRO:
        m_gal = new KIGFX::CAIRO_GAL( this, this, this );
        break;

    case GAL_TYPE_NONE:
        return;
    }

    m_gal->SetWorldUnitLength( 1.0 / METRIC_UNIT_LENGTH * 2.54 );   // 1 inch in nanometers
    m_gal->SetScreenDPI( 106 );                                     // Display resolution setting
    m_gal->ComputeWorldScreenMatrix();

    wxSize size = GetClientSize();
    m_gal->ResizeScreen( size.GetX(), size.GetY() );

    if( m_painter )
        m_painter->SetGAL( m_gal );

    if( m_view )
    {
        m_view->SetGAL( m_gal );
        m_view->RecacheAllItems( true );
    }

    m_currentGal = aGalType;
    m_pendingRefresh = false;
}


void EDA_DRAW_PANEL_GAL::onEvent( wxEvent& aEvent )
{
    if( !m_eventDispatcher )
    {
        aEvent.Skip();
        return;
    }
    else
    {
        m_eventDispatcher->DispatchWxEvent( aEvent );
    }

    Refresh();
}


void EDA_DRAW_PANEL_GAL::onEnter( wxEvent& aEvent )
{
    // Getting focus is necessary in order to receive key events properly
    SetFocus();
}


void EDA_DRAW_PANEL_GAL::skipEvent( wxEvent& aEvent )
{
    // This is necessary for CHAR_HOOK event to generate KEY_UP and KEY_DOWN events
    aEvent.Skip();
}