// Copyright (C) 2010, Guy Barrand. All rights reserved.
// See the file tools.license for terms.

#ifndef tools_metal_view_hm
#define tools_metal_view_hm

#import <MetalKit/MetalKit.h>

#include "ui_viewer"

@interface tools_metal_view : MTKView {
  @public tools::metal::ui_viewer* m_viewer;
  NSCursor* m_cursor_default;
  NSCursor* m_cursor_target;
  NSCursor* m_cursor_current;
}
- (BOOL)acceptsFirstResponder;
- (nonnull id)init:(NSRect)a_rect device:(nonnull id<MTLDevice>)a_device viewer:(nonnull tools::metal::ui_viewer*)a_viewer;
- (void)dealloc;
#ifdef TOOLS_METAL_DRAW_WHEN_NEEDED    
- (void)drawRect:(NSRect)a_rect;
#endif
- (void)resetCursorRects;
- (void)set_cursor:(tools::sg::cursor_shape)a_cursor;
- (void)mouseDown:(nonnull NSEvent*)a_event;
- (void)mouseUp:(nonnull NSEvent*)a_event;
- (void)mouseDragged:(nonnull NSEvent*)a_event;
@end

@implementation tools_metal_view
- (BOOL)acceptsFirstResponder {return YES;}
- (nonnull id)init:(NSRect)a_rect device:(nonnull id<MTLDevice>)a_device viewer:(nonnull tools::metal::ui_viewer*)a_viewer {
  //::printf("debug : tools::metal::tools_metal_view::init\n");
  self = [super initWithFrame:a_rect device:a_device];
  if(!self) return self;
  m_viewer = a_viewer;
  m_cursor_default = [NSCursor arrowCursor];
  m_cursor_target = [NSCursor crosshairCursor];
  m_cursor_current = m_cursor_default;
  
  NSTrackingAreaOptions _options = NSTrackingMouseEnteredAndExited | NSTrackingActiveAlways | NSTrackingInVisibleRect;
  NSTrackingArea* tracking_area =
    [[NSTrackingArea alloc] initWithRect:NSZeroRect
				 options:_options
				   owner:self userInfo:nil];
  [self addTrackingArea:tracking_area];

  return self;
}

- (void)dealloc {[super dealloc];}

#ifdef TOOLS_METAL_DRAW_WHEN_NEEDED    
- (void)drawRect:(NSRect)a_rect {
  [super drawRect:a_rect];
  if(!m_viewer) return;
  int w = a_rect.size.width;
  int h = a_rect.size.height;
  ::printf("debug : tools::metal::view::drawRect : %d %d\n",w,h);
  m_viewer->set_size(w,h);
  m_viewer->win_render();
}
#endif

- (void)mouseDown:(nonnull NSEvent*)a_event {
  [super mouseDown:a_event];
  ::printf("debug : tools::metal::view::mouse_down : begin :\n");
  //NSPoint p = [a_event locationInWindow];
  //(0,0) = bottom left of window.
  //NSLog(@"debug : tools_metal_view::mouseDown %g %g",p.x,p.y);
  if(!m_viewer) return;
  /*
  bool to_render = m_viewer->touch_down(p.x,p.y);
  if(m_viewer->do_works()) to_render = true;
  if(to_render) {
#ifdef TOOLS_METAL_DRAW_WHEN_NEEDED    
    ::printf("debug : tools::metal::view::mouse_down : to render...\n");
    m_viewer->win_render();
#else    
    [self setNeedsDisplay:YES];
#endif
  }
  ::printf("debug : tools::metal::view::mouse_down : end.\n");
  */
}

- (void)mouseUp:(nonnull NSEvent*)a_event {
  [super mouseUp:a_event];
  ::printf("debug : tools::metal::view::mouse_up : begin :\n");
  //NSPoint p = [a_event locationInWindow];
  //(0,0) = bottom left of window.
  //NSLog(@"debug : tools_metal_view::mouseUp %g %g",p.x,p.y);
  if(!m_viewer) return;
  /*
  m_viewer->add_work_check_arm_buttons();
  bool to_render = m_viewer->touch_up(p.x,p.y);
  //if(m_viewer->do_works()) to_render = true;
  if(to_render) {
#ifdef TOOLS_METAL_DRAW_WHEN_NEEDED    
    ::printf("debug : tools::metal::view::mouse_up : to render...\n");
    m_viewer->win_render();
#else    
    [self setNeedsDisplay:YES];
#endif
  }
  */
  NSRect rect;
  rect.origin.x = 0;
  rect.origin.y = 0;
  rect.size.width = 700;
  rect.size.height = 500;
  //  [self setNeedsDisplayInRect:rect];
  [self display];
  /*
  if(m_viewer->touch_up(p.x,p.y)) {
    //m_viewer->win_render();
    [self setNeedsDisplay:YES];
  }
  */
  ::printf("debug : tools::metal::view::mouse_up : end.\n");
}

- (void)mouseDragged:(nonnull NSEvent*)a_event {
  [super mouseDragged:a_event];
  ::printf("debug : tools::metal::view::mouse_dragged\n");
  //NSPoint p = [a_event locationInWindow];
  //(0,0) = bottom left of window.
  //NSLog(@"debug : tools_metal_view::mouseDragged %g %g",p.x,p.y);
  if(!m_viewer) return;
  //if(m_viewer->touch_move(p.x,p.y)) m_viewer->win_render();
}

- (void)resetCursorRects {
  [super resetCursorRects];
  //NSLog(@"debug : resetCursorRects");
  [self discardCursorRects];
  [self addCursorRect:self.bounds cursor:m_cursor_default];
  [self addCursorRect:self.bounds cursor:m_cursor_target];
  [m_cursor_current set];
}

- (void)mouseEntered:(nonnull NSEvent*)a_event {
  [super mouseEntered:a_event];
  [m_cursor_current set];
}

- (void)set_cursor:(tools::sg::cursor_shape)a_cursor {
  if(a_cursor==tools::sg::cursor_default) {
    [m_cursor_default set];
    m_cursor_current = m_cursor_default;
  } else if(a_cursor==tools::sg::cursor_target) {
    [m_cursor_target set];
    m_cursor_current = m_cursor_target;
  }
}
@end

@interface tools_metal_view_controller : NSViewController<MTKViewDelegate>
@end

@implementation tools_metal_view_controller {
}
-(void)drawInMTKView:(nonnull MTKView*)a_view {
  //static unsigned int s_count = 0;
  //::printf("debug : tools::metal::tools_metal_view_controller::drawInMtkView : %d\n",s_count);s_count++;
  tools_metal_view* _view = static_cast<tools_metal_view*>(a_view);
  @autoreleasepool { 
    _view->m_viewer->win_render();
  }
}
- (void)mtkView:(nonnull MTKView*)a_view drawableSizeWillChange:(CGSize)a_size {
  int w = a_size.width*0.5;
  int h = a_size.height*0.5;
//static unsigned int s_count = 0;
//::printf("debug : tools::metal::tools_metal_view_controller::drawableSizeWillChange : %d :%d %d : %d %d\n",
//         s_count,(int)a_size.width,(int)a_size.height,w,h);
  tools_metal_view* _view = static_cast<tools_metal_view*>(a_view);
  @autoreleasepool { 
    _view->m_viewer->set_size(w,h);
  //_view->m_viewer->win_render(); //no.
  }
}
@end

#endif