/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2015-2016 Mario Luzeiro <mrluzeiro@ua.pt>
 * Copyright (C) 1992-2016 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * 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
 */

/**
 * @file  c3d_model_viewer.cpp
 * @brief Implements a model viewer canvas. The propose of model viewer is to
 * render 3d models that come in the original data from the files without any
 * transformations.
 */

#include <iostream>
#include "3d_rendering/3d_render_ogl_legacy/c_ogl_3dmodel.h"
#include "c3d_model_viewer.h"
#include "../3d_rendering/3d_render_ogl_legacy/ogl_legacy_utils.h"
#include "../3d_cache/3d_cache.h"
#include "common_ogl/ogl_utils.h"
#include <wx/dcclient.h>
#include <base_units.h>
#include <gl_context_mgr.h>

/**
  * Scale convertion from 3d model units to pcb units
  */
#define UNITS3D_TO_UNITSPCB (IU_PER_MM)

/**
 *  Trace mask used to enable or disable the trace output of this class.
 *  The debug output can be turned on by setting the WXTRACE environment variable to
 *  "KI_TRACE_EDA_3D_MODEL_VIEWER".  See the wxWidgets documentation on wxLogTrace for
 *  more information.
 */
const wxChar * C3D_MODEL_VIEWER::m_logTrace = wxT( "KI_TRACE_EDA_3D_MODEL_VIEWER" );


BEGIN_EVENT_TABLE( C3D_MODEL_VIEWER, wxGLCanvas )
    EVT_PAINT( C3D_MODEL_VIEWER::OnPaint )

    // mouse events
    EVT_LEFT_DOWN(  C3D_MODEL_VIEWER::OnLeftDown )
    EVT_LEFT_UP(    C3D_MODEL_VIEWER::OnLeftUp )
    EVT_MIDDLE_UP(  C3D_MODEL_VIEWER::OnMiddleUp )
    EVT_MIDDLE_DOWN(C3D_MODEL_VIEWER::OnMiddleDown)
    EVT_RIGHT_DOWN( C3D_MODEL_VIEWER::OnRightClick )
    EVT_MOUSEWHEEL( C3D_MODEL_VIEWER::OnMouseWheel )
    EVT_MOTION(     C3D_MODEL_VIEWER::OnMouseMove )

#ifdef USE_OSX_MAGNIFY_EVENT
     EVT_MAGNIFY(   C3D_MODEL_VIEWER::OnMagnify )
#endif

    // other events
    EVT_ERASE_BACKGROUND( C3D_MODEL_VIEWER::OnEraseBackground )
END_EVENT_TABLE()


// This defines the range that all coord will have to be rendered.
// It will use this value to convert to a normalized value between
// -(RANGE_SCALE_3D/2) .. +(RANGE_SCALE_3D/2)
#define RANGE_SCALE_3D 8.0f


C3D_MODEL_VIEWER::C3D_MODEL_VIEWER(wxWindow *aParent,
                                    const int *aAttribList , S3D_CACHE *aCacheManager) :

                  wxGLCanvas( aParent,
                              wxID_ANY,
                              aAttribList,
                              wxDefaultPosition,
                              wxDefaultSize,
                              wxFULL_REPAINT_ON_RESIZE ),
                  m_trackBallCamera( RANGE_SCALE_3D * 2.0f ),
                  m_cacheManager(aCacheManager)
{
    wxLogTrace( m_logTrace, wxT( "C3D_MODEL_VIEWER::C3D_MODEL_VIEWER" ) );

    m_ogl_initialized = false;
    m_reload_is_needed = false;
    m_ogl_3dmodel = NULL;
    m_3d_model = NULL;
    m_BiuTo3Dunits = 1.0;

    m_glRC = NULL;
}


C3D_MODEL_VIEWER::~C3D_MODEL_VIEWER()
{
    wxLogTrace( m_logTrace, wxT( "C3D_MODEL_VIEWER::~C3D_MODEL_VIEWER" ) );

    if( m_glRC )
    {
        GL_CONTEXT_MANAGER::Get().LockCtx( m_glRC, this );

        delete m_ogl_3dmodel;
        m_ogl_3dmodel = NULL;

        GL_CONTEXT_MANAGER::Get().UnlockCtx( m_glRC );
        GL_CONTEXT_MANAGER::Get().DestroyCtx( m_glRC );
    }
}


void C3D_MODEL_VIEWER::Set3DModel( const S3DMODEL &a3DModel )
{
    wxLogTrace( m_logTrace, wxT( "C3D_MODEL_VIEWER::Set3DModel with a S3DMODEL" ) );

    // Validate a3DModel pointers
    wxASSERT( a3DModel.m_Materials != NULL );
    wxASSERT( a3DModel.m_Meshes != NULL );
    wxASSERT( a3DModel.m_MaterialsSize > 0 );
    wxASSERT( a3DModel.m_MeshesSize > 0 );

    // Delete the old model
    delete m_ogl_3dmodel;
    m_ogl_3dmodel = NULL;

    m_3d_model = NULL;

    if( (a3DModel.m_Materials != NULL) && (a3DModel.m_Meshes != NULL) &&
        (a3DModel.m_MaterialsSize > 0) && (a3DModel.m_MeshesSize > 0) )
    {
        m_3d_model = &a3DModel;
        m_reload_is_needed = true;
    }

    Refresh();
}


void C3D_MODEL_VIEWER::Set3DModel(const wxString &aModelPathName)
{
    wxLogTrace( m_logTrace, wxT( "C3D_MODEL_VIEWER::Set3DModel with a wxString" ) );

    if( m_cacheManager )
    {
        const S3DMODEL* model = m_cacheManager->GetModel( aModelPathName );

        if( model )
            Set3DModel( (const S3DMODEL &)*model );
        else
            Clear3DModel();
    }
}


void C3D_MODEL_VIEWER::Clear3DModel()
{
    // Delete the old model
    m_reload_is_needed = false;

    delete m_ogl_3dmodel;
    m_ogl_3dmodel = NULL;

    m_3d_model = NULL;

    Refresh();
}


void C3D_MODEL_VIEWER::ogl_initialize()
{
    glHint( GL_PERSPECTIVE_CORRECTION_HINT, GL_NICEST );
    glHint( GL_LINE_SMOOTH_HINT, GL_NICEST );
    glHint( GL_POLYGON_SMOOTH_HINT, GL_NICEST );

    glPolygonMode( GL_FRONT_AND_BACK, GL_FILL );
    glEnable( GL_DEPTH_TEST );
    //glDepthFunc( GL_LEQUAL );
    glEnable( GL_CULL_FACE );
    glShadeModel( GL_SMOOTH );
    glEnable( GL_LINE_SMOOTH );
    glEnable( GL_NORMALIZE );

    // Setup light
    // https://www.opengl.org/sdk/docs/man2/xhtml/glLight.xml
    // /////////////////////////////////////////////////////////////////////////
    const GLfloat ambient[]  = { 0.01f, 0.01f, 0.01f, 1.0f };
    const GLfloat diffuse[]  = { 1.0f, 1.0f, 1.0f, 1.0f };
    const GLfloat specular[] = { 1.0f, 1.0f, 1.0f, 1.0f };

    // defines a directional light that points along the negative z-axis
    const GLfloat position[] = { 0.0f, 0.0f, 2.0f * RANGE_SCALE_3D, 0.0f };

    const GLfloat lmodel_ambient[] = { 0.0f, 0.0f, 0.0f, 1.0f };

    glLightfv( GL_LIGHT0, GL_AMBIENT,  ambient );
    glLightfv( GL_LIGHT0, GL_DIFFUSE,  diffuse );
    glLightfv( GL_LIGHT0, GL_SPECULAR, specular );
    glLightfv( GL_LIGHT0, GL_POSITION, position );
    glLightModelfv( GL_LIGHT_MODEL_AMBIENT, lmodel_ambient );
}


void C3D_MODEL_VIEWER::ogl_set_arrow_material()
{
    glEnable( GL_COLOR_MATERIAL );
    glColorMaterial( GL_FRONT_AND_BACK, GL_AMBIENT_AND_DIFFUSE );

    const SFVEC4F specular = SFVEC4F( 0.1f, 0.1f, 0.1f, 1.0f );

    glMaterialfv( GL_FRONT_AND_BACK, GL_SPECULAR, &specular.r );
    glMaterialf(  GL_FRONT_AND_BACK, GL_SHININESS, 96.0f );
}


void C3D_MODEL_VIEWER::OnPaint( wxPaintEvent &event )
{
    wxPaintDC( this );

    event.Skip( false );

    // SwapBuffer requires the window to be shown before calling
    if( !IsShownOnScreen() )
    {
        wxLogTrace( m_logTrace, wxT( "C3D_MODEL_VIEWER::OnPaint !IsShown" ) );
        return;
    }

    // "Makes the OpenGL state that is represented by the OpenGL rendering
    //  context context current, i.e. it will be used by all subsequent OpenGL calls.
    //  This function may only be called when the window is shown on screen"
    if( m_glRC == NULL )
        m_glRC = GL_CONTEXT_MANAGER::Get().CreateCtx( this );

    GL_CONTEXT_MANAGER::Get().LockCtx( m_glRC, this );

    // Set the OpenGL viewport according to the client size of this canvas.
    // This is done here rather than in a wxSizeEvent handler because our
    // OpenGL rendering context (and thus viewport setting) is used with
    // multiple canvases: If we updated the viewport in the wxSizeEvent
    // handler, changing the size of one canvas causes a viewport setting that
    // is wrong when next another canvas is repainted.
    wxSize clientSize = GetClientSize();

    if( !m_ogl_initialized )
    {
        m_ogl_initialized = true;
        ogl_initialize();
    }

    if( m_reload_is_needed )
    {
        wxLogTrace( m_logTrace, wxT( "C3D_MODEL_VIEWER::OnPaint m_reload_is_needed" ) );

        m_reload_is_needed = false;
        m_ogl_3dmodel = new C_OGL_3DMODEL( *m_3d_model, MATERIAL_MODE_NORMAL );

        // It convert a model as it was a board, so get the max size dimension of the board
        // and compute the conversion scale
        m_BiuTo3Dunits = (double)RANGE_SCALE_3D /
                         ( (double)m_ogl_3dmodel->GetBBox().GetMaxDimension() *
                           UNITS3D_TO_UNITSPCB );
    }

    glViewport( 0, 0, clientSize.x, clientSize.y );

    m_trackBallCamera.SetCurWindowSize( clientSize );

    // clear color and depth buffers
    // /////////////////////////////////////////////////////////////////////////
    glEnable( GL_DEPTH_TEST );

    glClearColor( 0.0f, 0.0f, 0.0f, 1.0f );
    glClearDepth( 1.0f );
    glClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );

    // Set projection and modelview matrixes
    // /////////////////////////////////////////////////////////////////////////
    glMatrixMode( GL_PROJECTION );
    glLoadMatrixf( glm::value_ptr( m_trackBallCamera.GetProjectionMatrix() ) );

    glMatrixMode( GL_MODELVIEW );
    glLoadMatrixf( glm::value_ptr( m_trackBallCamera.GetViewMatrix() ) );

    glEnable( GL_LIGHTING );
    glEnable( GL_LIGHT0 );

    // Render Model
    if( m_ogl_3dmodel )
    {
        glPushMatrix();

        double modelunit_to_3d_units_factor = m_BiuTo3Dunits * UNITS3D_TO_UNITSPCB;

        glScaled( modelunit_to_3d_units_factor,
                  modelunit_to_3d_units_factor,
                  modelunit_to_3d_units_factor );

        // Center model in the render viewport
        const SFVEC3F model_center = m_ogl_3dmodel->GetBBox().GetCenter();

        glTranslatef( -model_center.x, -model_center.y, -model_center.z );

        m_ogl_3dmodel->Draw_opaque();
        m_ogl_3dmodel->Draw_transparent();

        glPopMatrix();
    }


    // YxY squared view port
    glViewport( 0, 0, clientSize.y / 8 , clientSize.y / 8 );
    glClear( GL_DEPTH_BUFFER_BIT );

    glMatrixMode( GL_PROJECTION );
    glLoadIdentity();
    gluPerspective( 45.0f, 1.0f, 0.01f, RANGE_SCALE_3D * 2.0f );

    glMatrixMode( GL_MODELVIEW );
    glLoadIdentity();

    const glm::mat4 TranslationMatrix = glm::translate( glm::mat4(1.0f),
                                                        SFVEC3F( 0.0f, 0.0f, -RANGE_SCALE_3D ) );

    const glm::mat4 ViewMatrix = TranslationMatrix * m_trackBallCamera.GetRotationMatrix();

    glLoadMatrixf( glm::value_ptr( ViewMatrix ) );

    ogl_set_arrow_material();

    glColor3f( 0.9f, 0.0f, 0.0f );
    OGL_draw_arrow( SFVEC3F( 0.0f, 0.0f, 0.0f ),
                    SFVEC3F( RANGE_SCALE_3D / 2.65f, 0.0f, 0.0f ),
                    0.275f );

    glColor3f( 0.0f, 0.9f, 0.0f );
    OGL_draw_arrow( SFVEC3F( 0.0f, 0.0f, 0.0f ),
                    SFVEC3F( 0.0f, RANGE_SCALE_3D / 2.65f, 0.0f ),
                    0.275f );

    glColor3f( 0.0f, 0.0f, 0.9f );
    OGL_draw_arrow( SFVEC3F( 0.0f, 0.0f, 0.0f ),
                    SFVEC3F( 0.0f, 0.0f, RANGE_SCALE_3D / 2.65f ),
                    0.275f );

    // "Swaps the double-buffer of this window, making the back-buffer the
    //  front-buffer and vice versa, so that the output of the previous OpenGL
    //  commands is displayed on the window."
    SwapBuffers();

    GL_CONTEXT_MANAGER::Get().UnlockCtx( m_glRC );
}


void C3D_MODEL_VIEWER::OnEraseBackground( wxEraseEvent &event )
{
    wxLogTrace( m_logTrace, wxT( "C3D_MODEL_VIEWER::OnEraseBackground" ) );
    // Do nothing, to avoid flashing.
}


void C3D_MODEL_VIEWER::OnMouseWheel( wxMouseEvent &event )
{
    wxLogTrace( m_logTrace, wxT( "C3D_MODEL_VIEWER::OnMouseWheel" ) );

    if( event.ShiftDown() )
    {
        //if( event.GetWheelRotation() < 0 )
            //SetView3D( WXK_UP );    // move up
        //else
            //SetView3D( WXK_DOWN );  // move down
    }
    else if( event.ControlDown() )
    {
        //if( event.GetWheelRotation() > 0 )
            //SetView3D( WXK_RIGHT ); // move right
        //else
            //SetView3D( WXK_LEFT );  // move left
    }
    else
    {
        if( event.GetWheelRotation() > 0 )
        {
            m_trackBallCamera.ZoomIn( 1.1f );
        }
        else
        {
            m_trackBallCamera.ZoomOut( 1.1f );
        }

        //DisplayStatus();
        Refresh( false );
    }

    m_trackBallCamera.SetCurMousePosition( event.GetPosition() );
}


#ifdef USE_OSX_MAGNIFY_EVENT
void C3D_MODEL_VIEWER::OnMagnify( wxMouseEvent& event )
{
    /*
    double magnification = ( event.GetMagnification() + 1.0f );
    GetPrm3DVisu().m_Zoom /= magnification;
    if( GetPrm3DVisu().m_Zoom <= 0.01 )
        GetPrm3DVisu().m_Zoom = 0.01;
    DisplayStatus();
    Refresh( false );
    */
}
#endif


void C3D_MODEL_VIEWER::OnMouseMove( wxMouseEvent &event )
{
    m_trackBallCamera.SetCurWindowSize( GetClientSize() );

    if( event.Dragging() )
    {
        if( event.LeftIsDown() )            // Drag
            m_trackBallCamera.Drag( event.GetPosition() );
        //else if( event.MiddleIsDown() )     // Pan
        //    m_trackBallCamera.Pan( event.GetPosition() );

        // orientation has changed, redraw mesh
        Refresh( false );
    }

    m_trackBallCamera.SetCurMousePosition( event.GetPosition() );
}


void C3D_MODEL_VIEWER::OnLeftDown( wxMouseEvent &event )
{
    //m_is_moving_mouse = true;
    event.Skip();
}


void C3D_MODEL_VIEWER::OnLeftUp( wxMouseEvent &event )
{
    //m_is_moving_mouse = false;
    //Refresh( false );
    event.Skip();
}


void C3D_MODEL_VIEWER::OnMiddleDown( wxMouseEvent &event )
{
    //m_is_moving_mouse = true;
    event.Skip();
}


void C3D_MODEL_VIEWER::OnMiddleUp( wxMouseEvent &event )
{
    //m_is_moving_mouse = false;
    //Refresh( false );
    event.Skip();
}


void C3D_MODEL_VIEWER::OnRightClick( wxMouseEvent &event )
{
    event.Skip();
}