/*=========================================================================

Program:   Visualization Toolkit

Copyright (c) Ken Martin, Will Schroeder, Bill Lorensen
All rights reserved.
See Copyright.txt or http://www.kitware.com/Copyright.htm for details.

This software is distributed WITHOUT ANY WARRANTY; without even
the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR
PURPOSE.  See the above copyright notice for more information.

=========================================================================*/

#import "MyGLKViewController.h"
#include "vtk/vtkIOSRenderWindow.h"
#include "vtk/vtkIOSRenderWindowInteractor.h"
#include "vtk/vtkRenderingOpenGL2ObjectFactory.h"

#include "vtk/vtkNew.h"

#include "vtk/vtkNrrdReader.h"
#include "vtk/vtkImageCast.h"
#include "vtk/vtkRTAnalyticSource.h"
#include "vtk/vtkOpenGLGPUVolumeRayCastMapper.h"
#include "vtk/vtkVolumeProperty.h"
#include "vtk/vtkColorTransferFunction.h"
#include "vtk/vtkPiecewiseFunction.h"
#include "vtk/vtkVolume.h"
#include "vtk/vtkActor.h"
#include "vtk/vtkCamera.h"
#include "vtk/vtkConeSource.h"
#include "vtk/vtkDebugLeaks.h"
#include "vtk/vtkGlyph3D.h"
#include "vtk/vtkPolyData.h"
#include "vtk/vtkPolyDataMapper.h"
#include "vtk/vtkRenderWindow.h"
#include "vtk/vtkRenderer.h"
#include "vtk/vtkSphereSource.h"
#include "vtk/vtkTextActor.h"
#include "vtk/vtkTextProperty.h"
#include "vtk/vtkImageData.h"
#include "vtk/vtkPointData.h"
#include "vtk/vtkSmartPointer.h"

#include "vtk/vtkActor.h"
#include "vtk/vtkActor2D.h"
#include "vtk/vtkCamera.h"
#include "vtk/vtkCommand.h"
#include "vtk/vtkInteractorStyleMultiTouchCamera.h"
#include "vtk/vtkMath.h"
#include "vtk/vtkPoints.h"
#include "vtk/vtkPolyDataMapper.h"
#include "vtk/vtkRenderer.h"
#include "vtk/vtkTextMapper.h"
#include "vtk/vtkTextProperty.h"

#include <deque>


@interface MyGLKViewController () {
}

@property (strong, nonatomic) EAGLContext *context;
- (void)tearDownGL;
@end

@implementation MyGLKViewController

//----------------------------------------------------------------------------
- (vtkIOSRenderWindow *)getVTKRenderWindow
{
  return _myVTKRenderWindow;
}

//----------------------------------------------------------------------------
- (void)setVTKRenderWindow:(vtkIOSRenderWindow *)theVTKRenderWindow
{
  _myVTKRenderWindow = theVTKRenderWindow;
}

//----------------------------------------------------------------------------
- (vtkIOSRenderWindowInteractor *)getInteractor
{
  if (_myVTKRenderWindow)
  {
    return (vtkIOSRenderWindowInteractor *)_myVTKRenderWindow->GetInteractor();
  }
  else
  {
    return NULL;
  }
}

- (void)setupPipeline
{
  // Register GL2 objects
  vtkObjectFactory::RegisterFactory(vtkRenderingOpenGL2ObjectFactory::New());

    vtkIOSRenderWindow *renWin = vtkIOSRenderWindow::New();
    //renWin->DebugOn();
    [self setVTKRenderWindow:renWin];

    // this example uses VTK's built in interaction but you could choose
    // to use your own instead.
    vtkRenderWindowInteractor *iren = vtkRenderWindowInteractor::New();
    vtkNew<vtkInteractorStyleMultiTouchCamera> ismt;
    ismt->DebugOn();
    iren->SetInteractorStyle(ismt.Get());
    iren->SetRenderWindow(renWin);

    vtkNew<vtkRenderer> renderer;
    renWin->AddRenderer(renderer.Get());

    vtkNew<vtkOpenGLGPUVolumeRayCastMapper> volumeMapper;

#if 0
    vtkNew<vtkRTAnalyticSource> wavelet;
    wavelet->SetWholeExtent(-127, 128,
                            -127, 128,
                            -127, 128);
    wavelet->SetCenter(0.0, 0.0, 0.0);

    vtkNew<vtkImageCast> ic;
    ic->SetInputConnection(wavelet->GetOutputPort());
    ic->SetOutputScalarTypeToUnsignedChar();
    volumeMapper->SetInputConnection(ic->GetOutputPort());
#else
        NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
        NSString *basePath = paths.firstObject;
    std::string fname([basePath UTF8String]);
    fname += "/CT-chest-quantized.nrrd";
    vtkNew<vtkNrrdReader> mi;
    mi->SetFileName(fname.c_str());
    mi->Update();

    double range[2];
    mi->GetOutput()->GetPointData()->GetScalars()->GetRange(range);

    volumeMapper->SetInputConnection(mi->GetOutputPort());
#endif


    volumeMapper->SetAutoAdjustSampleDistances(1);
    volumeMapper->SetSampleDistance(0.5);

    vtkNew<vtkVolumeProperty> volumeProperty;
    volumeProperty->SetShade(1);
    volumeProperty->SetInterpolationTypeToLinear();

    vtkNew<vtkColorTransferFunction> ctf;
    // ctf->AddRGBPoint(90, 0.2, 0.29, 1);
    // ctf->AddRGBPoint(157.091, 0.87, 0.87, 0.87);
    // ctf->AddRGBPoint(250, 0.7, 0.015, 0.15);

    ctf->AddRGBPoint(0, 0, 0, 0);
    ctf->AddRGBPoint(255*67.0106/3150.0, 0.54902, 0.25098, 0.14902);
    ctf->AddRGBPoint(255*251.105/3150.0, 0.882353, 0.603922, 0.290196);
    ctf->AddRGBPoint(255*439.291/3150.0, 1, 0.937033, 0.954531);
    ctf->AddRGBPoint(255*3071/3150.0, 0.827451, 0.658824, 1);


    // vtkNew<vtkPiecewiseFunction> pwf;
    // pwf->AddPoint(0, 0.0);
    // pwf->AddPoint(7000, 1.0);

    double tweak = 80.0;
    vtkNew<vtkPiecewiseFunction> pwf;
    pwf->AddPoint(0, 0);
    pwf->AddPoint(255*(67.0106+tweak)/3150.0, 0);
    pwf->AddPoint(255*(251.105+tweak)/3150.0, 0.3);
    pwf->AddPoint(255*(439.291+tweak)/3150.0, 0.5);
    pwf->AddPoint(255*3071/3150.0, 0.616071);

    volumeProperty->SetColor(ctf.GetPointer());
    volumeProperty->SetScalarOpacity(pwf.GetPointer());

    vtkNew<vtkVolume> volume;
    volume->SetMapper(volumeMapper.GetPointer());
    volume->SetProperty(volumeProperty.GetPointer());

    renderer->SetBackground2(0.2,0.3,0.4);
    renderer->SetBackground(0.1,0.1,0.1);
    renderer->GradientBackgroundOn();
    renderer->AddVolume(volume.GetPointer());
    renderer->ResetCamera();
    renderer->GetActiveCamera()->Zoom(1.4);
}


- (void)viewDidLoad
{
  [super viewDidLoad];

  self.context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES3];

  if (!self.context) {
      NSLog(@"Failed to create ES context");
  }

  GLKView *view = (GLKView *)self.view;
  view.context = self.context;
  view.drawableDepthFormat = GLKViewDrawableDepthFormat16;
  //view.drawableMultisample = GLKViewDrawableMultisample4X;

  // setup the vis pipeline
  [self setupPipeline];

  [EAGLContext setCurrentContext:self.context];
  [self resizeView];
  [self getVTKRenderWindow]->Render();
}


- (void)dealloc
{
  [self tearDownGL];

  if ([EAGLContext currentContext] == self.context) {
      [EAGLContext setCurrentContext:nil];
  }
}

- (void)didReceiveMemoryWarning
{
  [super didReceiveMemoryWarning];

  if ([self isViewLoaded] && ([[self view] window] == nil)) {
    self.view = nil;

    [self tearDownGL];

    if ([EAGLContext currentContext] == self.context) {
        [EAGLContext setCurrentContext:nil];
    }
    self.context = nil;
  }

  // Dispose of any resources that can be recreated.
}

- (void)tearDownGL
{
  [EAGLContext setCurrentContext:self.context];

  // free GL resources
  // ...
}

-(void) resizeView
{
  double scale = self.view.contentScaleFactor;
  double newWidth = scale * self.view.bounds.size.width;
  double newHeight = scale * self.view.bounds.size.height;
  [self getVTKRenderWindow]->SetSize(newWidth, newHeight);
}

- (void)viewWillLayoutSubviews
{
  [self resizeView];
}

- (void)glkView:(GLKView *)view drawInRect:(CGRect)rect
{
  //std::cout << [self getVTKRenderWindow]->ReportCapabilities() << std::endl;
  [self getVTKRenderWindow]->Render();
}



//=================================================================
// this example uses VTK's built in interaction but you could choose
// to use your own instead. The remaining methods forward touch events
// to VTKs interactor.

// Handles the start of a touch
- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
  vtkIOSRenderWindowInteractor *interactor = [self getInteractor];
  if (!interactor)
  {
    return;
  }

  CGRect bounds = [self.view bounds];
  double scale = self.view.contentScaleFactor;

  // set the position for all contacts
  NSSet *myTouches = [event touchesForView:self.view];
  for (UITouch *touch in myTouches)
  {
    // Convert touch point from UIView referential to OpenGL one (upside-down flip)
    CGPoint location = [touch locationInView:self.view];
    location.y = bounds.size.height - location.y;

    // Account for the content scaling factor
    location.x *= scale;
    location.y *= scale;

    int index = interactor->GetPointerIndexForContact((size_t)(__bridge void *)touch);
    if (index < VTKI_MAX_POINTERS)
    {
      interactor->SetEventInformation((int)round(location.x),
                                      (int)round(location.y),
                                      0, 0,
                                      0, 0, 0, index);
    }
  }

  // handle begin events
  for (UITouch *touch in touches)
  {
    int index = interactor->GetPointerIndexForContact((size_t)(__bridge void *)touch);
        vtkGenericWarningMacro("down touch  " << (size_t)(__bridge void *)touch << " index " << index);
    interactor->SetPointerIndex(index);
    interactor->LeftButtonPressEvent();
    //NSLog(@"Starting left mouse");
  }

  // Display the buffer
  [(GLKView *)self.view display];
}

// Handles the continuation of a touch.
- (void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event
{
  vtkIOSRenderWindowInteractor *interactor = [self getInteractor];
  if (!interactor)
  {
    return;
  }

  CGRect bounds = [self.view bounds];
  double scale = self.view.contentScaleFactor;

  // set the position for all contacts
  int index;
  NSSet *myTouches = [event touchesForView:self.view];
  for (UITouch *touch in myTouches)
  {
    // Convert touch point from UIView referential to OpenGL one (upside-down flip)
    CGPoint location = [touch locationInView:self.view];
    location.y = bounds.size.height - location.y;

    // Account for the content scaling factor
    location.x *= scale;
    location.y *= scale;

    index = interactor->GetPointerIndexForContact((size_t)(__bridge void *)touch);
    if (index < VTKI_MAX_POINTERS)
    {
      interactor->SetEventInformation((int)round(location.x),
                                      (int)round(location.y),
                                      0, 0,
                                      0, 0, 0, index);
    }
  }

  // fire move event on last index
  interactor->SetPointerIndex(index);
  interactor->MouseMoveEvent();
NSLog(@"Moved left mouse");

  // Display the buffer
  [(GLKView *)self.view display];
}

// Handles the end of a touch event when the touch is a tap.
- (void)touchesEnded:(NSSet *)touches withEvent:(UIEvent *)event
{
  vtkIOSRenderWindowInteractor *interactor = [self getInteractor];
  if (!interactor)
  {
    return;
  }

  CGRect bounds = [self.view bounds];
  double scale = self.view.contentScaleFactor;

  // set the position for all contacts
  NSSet *myTouches = [event touchesForView:self.view];
  for (UITouch *touch in myTouches)
  {
    // Convert touch point from UIView referential to OpenGL one (upside-down flip)
    CGPoint location = [touch locationInView:self.view];
    location.y = bounds.size.height - location.y;

    // Account for the content scaling factor
    location.x *= scale;
    location.y *= scale;

    int index = interactor->GetPointerIndexForContact((size_t)(__bridge void *)touch);
    if (index < VTKI_MAX_POINTERS)
    {
      interactor->SetEventInformation((int)round(location.x),
                                  (int)round(location.y),
                                  0, 0,
                                  0, 0, 0, index);
    }
  }

  // handle begin events
  for (UITouch *touch in touches)
  {
    int index = interactor->GetPointerIndexForContact((size_t)(__bridge void *)touch);
        vtkGenericWarningMacro("up touch  " << (size_t)(__bridge void *)touch << " index " << index);
    interactor->SetPointerIndex(index);
    interactor->LeftButtonReleaseEvent();
    interactor->ClearContact((size_t)(__bridge void *)touch);
     // NSLog(@"lifting left mouse");
  }

  // Display the buffer
  [(GLKView *)self.view display];
}

// Handles the end of a touch event.
- (void)touchesCancelled:(NSSet *)touches withEvent:(UIEvent *)event
{
  vtkIOSRenderWindowInteractor *interactor = [self getInteractor];
  if (!interactor)
  {
    return;
  }

  CGRect bounds = [self.view bounds];
  double scale = self.view.contentScaleFactor;

  UITouch* touch = [[event touchesForView:self.view] anyObject];
  // Convert touch point from UIView referential to OpenGL one (upside-down flip)
  CGPoint location = [touch locationInView:self.view];
  location.y = bounds.size.height - location.y;

  // Account for the content scaling factor
  location.x *= scale;
  location.y *= scale;

  interactor->SetEventInformation((int)round(location.x),
                                  (int)round(location.y),
                                  0, 0,
                                  0, 0);
  interactor->LeftButtonReleaseEvent();
  // NSLog(@"Ended left mouse");

  // Display the buffer
  [(GLKView *)self.view display];
}


@end