/* 
 * Copyright (c) 2010, 2015, Oracle and/or its affiliates. All rights reserved.
 *
 * 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; version 2 of the
 * License.
 * 
 * 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, write to the Free Software
 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
 * 02110-1301  USA
 */

#import "MFSplitter.h"
#import "MFMForms.h"
#import "MFBox.h"

@implementation MFSplitterImpl

static NSSize initialSize = {10,10};

- (instancetype)initWithObject:(::mforms::Splitter*)aSplitter
{
  self= [super initWithFrame: NSMakeRect(10,10,10,10)];
  if (self)
  {
    mOwner= aSplitter;
    mOwner->set_data(self);
    [self setDelegate: self];
    mRequestedPosition = -1;
    mResizable[0] = YES;
    mResizable[1] = YES;
  }
  return self;
}


- (mforms::Object*)mformsObject
{
  return mOwner;
}



- (void)setHorizontal:(BOOL)flag
{
  mHorizontal= flag;
  [self setVertical: flag];
}


- (void)setPosition:(int)position
{
  // If our size is still the initial size, schedule the size to be set later (usually happens in tabviews before being shown).
  if (NSEqualSizes([self frame].size, initialSize) || NSEqualSizes([self frame].size, NSZeroSize))
    mRequestedPosition = position;
  else
    [self setPosition:position ofDividerAtIndex:0];
}

- (int)position
{
  // If our size is still the initial size, return the requested position if set previously.
  if ((NSEqualSizes([self frame].size, initialSize) || NSEqualSizes([self frame].size, NSZeroSize))
      && mRequestedPosition > -1)
    return mRequestedPosition;
  else
  {
    NSRect frame = [[self subviews][0] frame];
    return [self isVertical] ? NSMaxX(frame) : NSMaxY(frame);
  }
}



- (NSSize)minimumSize
{
  NSSize size, minSize;
  float maxSize= 0;
  int i = 0;
  
  size.width= 0;
  size.height= 0;
  
  for (id subview in [self subviews])
  {
    if (![subview isHidden])
    {
      minSize= [subview preferredSize];
      
      if (mHorizontal)
      {
        size.width+= minSize.width;
        maxSize= MAX(maxSize, minSize.width);
        size.height= MAX(size.height, MAX(mMinSizes[i], minSize.height));
      }
      else
      {
        size.width= MAX(size.width, MAX(mMinSizes[i], minSize.width));
        maxSize= MAX(maxSize, minSize.height);
        size.height+= minSize.height;
      }
    }
    i++;
  }  
  return size;
}


- (void)resizeSubviewsWithOldSize:(NSSize)osize
{
  [super resizeSubviewsWithOldSize:osize];

  if (NSEqualSizes(osize, [self frame].size))
  {
    for (id sub in [self subviews])
      [sub resizeSubviewsWithOldSize: [sub frame].size];
  }

  if (!NSEqualSizes([self frame].size, initialSize) && !NSEqualSizes([self frame].size, NSZeroSize)
      && mRequestedPosition > 0)
  {
    [self setPosition:mRequestedPosition ofDividerAtIndex:0];
    mRequestedPosition= -1;
  }
}

/* this is bogus, we shouldn't be hiding the divider making it impossible to drag
- (BOOL)splitView: (NSSplitView*)splitView shouldHideDividerAtIndex: (NSInteger)dividerIndex
{
  return YES;
}*/

- (BOOL)splitView:(NSSplitView *)splitView canCollapseSubview:(NSView *)subview
{
  return YES;
}

- (BOOL)splitView:(NSSplitView *)splitView shouldAdjustSizeOfSubview:(NSView *)subview
{
  if (subview == [[splitView subviews] lastObject])
    return mResizable[1];
  else
    return mResizable[0];
}

- (CGFloat)splitView:(NSSplitView *)splitView constrainMaxCoordinate:(CGFloat)proposedMax ofSubviewAt:(NSInteger)dividerIndex
{
  if (mHorizontal)
  {
    if (proposedMax > NSWidth([splitView frame]) - mMinSizes[1])
      proposedMax = NSWidth([splitView frame]) - mMinSizes[1];
  }
  else
  {
    if (proposedMax > NSHeight([splitView frame]) - mMinSizes[1])
      proposedMax = NSHeight([splitView frame]) - mMinSizes[1];
  }
  return proposedMax;
}


- (CGFloat)splitView:(NSSplitView *)splitView constrainMinCoordinate:(CGFloat)proposedMin ofSubviewAt:(NSInteger)dividerIndex
{
  if (proposedMin < mMinSizes[0])
    proposedMin = mMinSizes[0];
  return proposedMin;
}


- (void)splitViewDidResizeSubviews:(NSNotification *)notification
{
  if ((self.viewFlags & RemovingFlag) == 0)
    mOwner->position_changed();
}

- (NSRect)splitView:(NSSplitView *)splitView
      effectiveRect:(NSRect)proposedEffectiveRect 
       forDrawnRect:(NSRect)drawnRect
   ofDividerAtIndex:(NSInteger)dividerIndex
{
  // if the divider is too thin, increase effective rect by 2px to make it less impossible to drag
  if ([splitView isVertical])
  {
    if (proposedEffectiveRect.size.width < 2)
    {
      proposedEffectiveRect.origin.x -= 1;
      proposedEffectiveRect.size.width += 2;
    }
  }
  else
  {
    if (proposedEffectiveRect.size.height < 2)
    {
      proposedEffectiveRect.origin.y -= 1;
      proposedEffectiveRect.size.height += 2;
    }
  }
  return proposedEffectiveRect;
}

static bool splitter_create(::mforms::Splitter *self, bool horiz, bool thin)
{
  MFSplitterImpl *splitter = [[MFSplitterImpl alloc] initWithObject: self];
  
  [splitter setHorizontal: horiz ? YES : NO];
  if (thin)
    [splitter setDividerStyle: NSSplitViewDividerStyleThin];
  
  return true;  
}

static void splitter_set_position(::mforms::Splitter *self, int pos)
{
  if ( self )
  {
    MFSplitterImpl* splitter = self->get_data();
    
    if ( splitter )
    {
      [splitter setPosition:pos];
    }
  }
}

static int splitter_get_position(::mforms::Splitter *self)
{
  if ( self )
  {
    MFSplitterImpl* splitter = self->get_data();
    
    if ( splitter )
    {
      return [splitter position];
    }
  }
  return 0;
}



static void splitter_add(::mforms::Splitter *self, ::mforms::View *child, int minsize, bool fixed)
{
  int idx;
  MFSplitterImpl *impl = self->get_data();
  if ((idx = [[impl subviews] count]) > 2)
  {
    NSLog(@"Attempt to add subview to splitter with 2 items already");
    return;
  }
  impl->mResizable[idx] = !fixed;
  impl->mMinSizes[idx] = minsize;
  [impl addSubview: child->get_data()];
}


static void splitter_remove(::mforms::Splitter *self, ::mforms::View *child)
{
  MFSplitterImpl *impl = self->get_data();
  if ([[impl subviews] indexOfObject: child->get_data()] == 0)
    impl->mMinSizes[0] = impl->mMinSizes[1];
  [child->get_data() removeFromSuperview];
}


static void splitter_set_expanded(::mforms::Splitter *self, bool first, bool expand)
{
  MFSplitterImpl *impl = self->get_data();
  
  NSView *view1  = [impl subviews][0];
	NSView *view2 = [impl subviews][1];

  [impl adjustSubviews];

  if (first)
  {
    if (!expand == [impl isSubviewCollapsed: view1])
      return;
    
    if (expand)
    {
      [view1 setHidden: NO];
      NSRect frame = [view1 frame];
      [impl setPosition: frame.size.width ofDividerAtIndex: 0];
    }
    else
    {
      [view1 setHidden: YES];
      [impl setPosition: [impl minPossiblePositionOfDividerAtIndex: 0] ofDividerAtIndex: 0];
    }
  }
  else
  {
    if (!expand == [impl isSubviewCollapsed: view2])
      return;
    
    if (expand)
    {
      [view2 setHidden: NO];
      CGFloat dividerThickness = [impl dividerThickness];

      NSRect frame1 = [view1 frame];
      NSRect frame2 = [view2 frame];
      
      if ([impl isVertical]) // Is the splitter bar vertical (not the layout)?
      {
        // Adjust left frame size.
        frame1.size.width = (frame1.size.width - frame2.size.width - dividerThickness);
        frame2.origin.x = frame1.size.width + dividerThickness;
        [view1 setFrameSize: frame1.size];
        [view2 setFrame: frame2];
      }
      else
      {
        // Adjust top frame size.
        frame1.size.height = (frame1.size.height - frame2.size.height - dividerThickness);
        frame2.origin.y = frame1.size.height + dividerThickness;
        [view1 setFrameSize: frame1.size];
        [view2 setFrame: frame2];
      }
    }
    else
    {
      NSRect frame1 = [view1 frame];
      NSRect overallFrame = [impl frame];
      [view2 setHidden: YES];
      if ([impl isVertical])
        [view1 setFrameSize: NSMakeSize(overallFrame.size.width, frame1.size.height)];
      else
        [view1 setFrameSize: NSMakeSize(frame1.size.width, overallFrame.size.height)];
    }
  }
  [impl display];
}


void cf_splitter_init()
{
  ::mforms::ControlFactory *f = ::mforms::ControlFactory::get_instance();
  
  f->_splitter_impl.create= &splitter_create;
  f->_splitter_impl.set_position= &splitter_set_position;
  f->_splitter_impl.get_position= &splitter_get_position;
  f->_splitter_impl.add= &splitter_add;
  f->_splitter_impl.remove= &splitter_remove;
  f->_splitter_impl.set_expanded = &splitter_set_expanded;
}

@end


