/*
   NSWindowController.m

   Copyright (C) 2000 Free Software Foundation, Inc.

   This file is part of the GNUstep GUI Library.

   This library is free software; you can redistribute it and/or
   modify it under the terms of the GNU Library General Public
   License as published by the Free Software Foundation; either
   version 2 of the License, or (at your option) any later version.

   This library 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
   Library General Public License for more details.

   You should have received a copy of the GNU Library General Public
   License along with this library; if not, write to the Free
   Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111 USA.
*/

#import <AppKit/NSWindowController.h>
#import <AppKit/NSPanel.h>
#import <AppKit/NSNibLoading.h>
#import <AppKit/NSDocumentFrameworkPrivate.h>

@implementation NSWindowController

- (id) initWithWindowNibName: (NSString *)windowNibName
{
  return [self initWithWindowNibName: windowNibName  owner: self];
}

- (id) initWithWindowNibName: (NSString *)windowNibName  owner: (id)owner
{
  if (windowNibName == nil)
    {
      [NSException raise: NSInvalidArgumentException
		   format: @"attempt to init NSWindowController with nil windowNibName"];
    }

  if (owner == nil)
    {
      [NSException raise: NSInvalidArgumentException
		   format: @"attempt to init NSWindowController with nil owner"];
    }

  self = [self initWithWindow: nil];
  ASSIGN (_windowNibName, windowNibName);
  _owner = owner;
  return self;
}

- (id) initWithWindow: (NSWindow *)window
{
  self = [super init];

  ASSIGN (_window, window);
  _windowFrameAutosaveName = @"";
  _wcFlags.shouldCascade = YES;
  _wcFlags.shouldCloseDocument = NO;

  if (_window != nil)
    {
      [self _windowDidLoad];
    }

  return self;
}

- (id) init
{
  return [self initWithWindow: nil];
}

- (void) dealloc
{
  [[NSNotificationCenter defaultCenter] removeObserver: self];
  RELEASE (_windowNibName);
  RELEASE (_windowFrameAutosaveName);
  RELEASE (_topLevelObjects);
  AUTORELEASE (_window); /* FIXME - should be RELEASE I think */
  [super dealloc];
}

- (NSString *) windowNibName
{
  return _windowNibName;
}

- (id) owner
{
  return _owner;
}

- (void) setDocument: (NSDocument *)document
{
  // FIXME - this is RETAINed and never RELEASEd ...
  ASSIGN(_document, document);
  [self _synchronizeWindowTitleWithDocumentName];
}

- (id) document
{
  return _document;
}

- (void) setWindowFrameAutosaveName:(NSString *)name
{
  ASSIGN (_windowFrameAutosaveName, name);
  
  if ([self isWindowLoaded])
    {
      [[self window] setFrameAutosaveName:name? name : @""];
    }
}

- (NSString *) windowFrameAutosaveName;
{
  return _windowFrameAutosaveName;
}

- (void) setShouldCloseDocument: (BOOL)flag
{
  _wcFlags.shouldCloseDocument = flag;
}

- (BOOL) shouldCloseDocument
{
  return _wcFlags.shouldCloseDocument;
}

- (void) setShouldCascadeWindows: (BOOL)flag
{
  _wcFlags.shouldCascade = flag;
}

- (BOOL) shouldCascadeWindows
{
  return _wcFlags.shouldCascade;
}

- (void) close
{
  [_window close];
}


- (void) _windowWillClose: (NSNotification *)notification
{
  if ([notification object] == _window)
    {
      if ([_window delegate] == self) 
	{
	  [_window setDelegate: nil];
	}
      if ([_window windowController] == self) 
	{
	  [_window setWindowController: nil];
	}
      
      /*
       * If the window is set to isReleasedWhenClosed, it will release
       * itself, so nil out our reference so we don't release it again
       * We may want to unilaterally turn off the setting in the NSWindow
       * instance so it doesn't cause problems.
       * 
       * Apple's implementation doesn't seem to deal with this case, and
       * crashes if isReleaseWhenClosed is set.
       */
      if ([_window isReleasedWhenClosed])
	{
	  _window = nil;
	}
      [_document _removeWindowController: self];
    }
}

- (NSWindow *) window
{
  if (_window == nil && ![self isWindowLoaded])
    {
      // Do all the notifications.  Yes, the docs say this should
      // be implemented here instead of in -loadWindow itself.
      [self windowWillLoad];
      if ([_document respondsToSelector:
		       @selector(windowControllerWillLoadNib:)])
	{
	  [_document windowControllerWillLoadNib:self];
	}

      [self loadWindow];

      [self _windowDidLoad];
      if ([_document respondsToSelector:
		       @selector(windowControllerDidLoadNib:)])
	{
	  [_document windowControllerDidLoadNib:self];
	}
    }

  return _window;
}

// Private method; the nib loading will call this.
- (void) setWindow: (NSWindow *)aWindow
{
  ASSIGN (_window, aWindow);
}

- (IBAction) showWindow: (id)sender
{
  NSWindow *window = [self window];

  if ([window isKindOfClass: [NSPanel class]] 
      && [(NSPanel*)window becomesKeyOnlyIfNeeded])
    {
      [window orderFront: sender];
    }
  else
    {
      [window makeKeyAndOrderFront: sender];
    }
}

- (NSString *) windowTitleForDocumentDisplayName:(NSString *)displayName
{
  return displayName;
}

- (void) _synchronizeWindowTitleWithDocumentName
{
  if (_document)
    {
      NSString *filename = [_document fileName];
      NSString *displayName = [_document displayName];
      NSString *title = [self windowTitleForDocumentDisplayName:displayName];

      /* If they just want to display the filename, use the fancy method */
      if (filename != nil && [title isEqualToString:filename])
        {
          [_window setTitleWithRepresentedFilename:filename];
        }
      else
        {
          if (filename) [_window setRepresentedFilename:filename];
            [_window setTitle:title];
        }
    }
}

- (BOOL)isWindowLoaded
{
  return _wcFlags.nibIsLoaded;
}

- (void)windowDidLoad
{
}

- (void)windowWillLoad
{
}

- (void)_windowDidLoad
{
  _wcFlags.nibIsLoaded = YES;

  [_window setWindowController: self];

  [self _synchronizeWindowTitleWithDocumentName];
  
  [[NSNotificationCenter defaultCenter]
                addObserver: self
                selector: @selector(_windowWillClose:)
                name: NSWindowWillCloseNotification
                object: _window];

  /* Make sure window sizes itself right */
  if ([_windowFrameAutosaveName length] > 0)
    {
      [_window setFrameUsingName: _windowFrameAutosaveName];
      [_window setFrameAutosaveName: _windowFrameAutosaveName];
    }

  if ([self shouldCascadeWindows])
    {
      static NSPoint nextWindowLocation  = { 0.0, 0.0 };
      static BOOL firstWindow = YES;

      if (firstWindow)
        {
          NSRect windowFrame = [_window frame];

          /* Start with the frame as set */
          nextWindowLocation = NSMakePoint (NSMinX (windowFrame), 
					    NSMaxY (windowFrame));
          firstWindow = NO;
        }
      else
        {
          /*
           * cascadeTopLeftFromPoint will "wrap" the point back to the
           * top left if the normal cascading will cause the window to go
           * off the screen. In Apple's implementation, this wraps to the
           * extreme top of the screen, and offset only a small amount
           * from the left.
           */
           nextWindowLocation = [_window 
				  cascadeTopLeftFromPoint: nextWindowLocation];
        }
    }

  [self windowDidLoad];
}

- (void)loadWindow
{
  if ([self isWindowLoaded]) return;

  if ([NSBundle loadNibNamed:_windowNibName owner:_owner])
    {
      _wcFlags.nibIsLoaded = YES;

      if (_window == nil && _document && _owner == _document)
        [self setWindow:[_document _transferWindowOwnership]];
    }
  else
    {
      NSLog(@"%@: could not load nib named %@.nib", [self class], _windowNibName);
    }
}

/*
 * There's no way I'll ever get these compatible if Apple's versions
 * actually encode anything, sigh
 */
- (id) initWithCoder: (NSCoder *)coder
{
  return [self init];
}

- (void) encodeWithCoder: (NSCoder *)coder
{
  // What are we supposed to encode?  Window nib name?  Or should these
  // be empty, just to conform to NSCoding, so we do an -init on
  // unarchival.  ?
}

@end