/*
  File:		MBCBoardViewAccessibility.mm
  Contains:	Accessibility navigation for chess board
  Copyright:	© 2002-2005 Apple Computer, Inc. All rights reserved.
	IMPORTANT: This Apple software is supplied to you by Apple Computer,
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	other rights or licenses, express or implied, are granted by Apple
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	infringed by your derivative works or by other works in which the
	Apple Software may be incorporated.
	
	The Apple Software is provided by Apple on an "AS IS" basis.  APPLE
	MAKES NO WARRANTIES, EXPRESS OR IMPLIED, INCLUDING WITHOUT LIMITATION
	THE IMPLIED WARRANTIES OF NON-INFRINGEMENT, MERCHANTABILITY AND
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*/

#import "MBCBoardViewAccessibility.h"
#import "MBCBoardViewMouse.h"
#import "MBCInteractivePlayer.h"

@implementation MBCBoardAccessibilityProxy

+ (id) proxyWithView:(MBCBoardView *)view square:(MBCSquare)square
{
	return [[[MBCBoardAccessibilityProxy alloc] 
				initWithView:view square:square]
			   autorelease];
}

- (id) initWithView:(MBCBoardView *)view square:(MBCSquare)square
{
	fView	= view;
	fSquare = square;

	return self;
}

- (BOOL) isEqual:(MBCBoardAccessibilityProxy *)other
{
	return [other isKindOfClass:[MBCBoardAccessibilityProxy class]]
		&& fSquare == other->fSquare;
}

- (NSString *) description
{
	return [NSString stringWithFormat:@"Square %c%u", 
					 Col(fSquare), Row(fSquare)];
}

- (NSArray *)accessibilityAttributeNames 
{
	return [NSArray arrayWithObjects:
					NSAccessibilityRoleAttribute,
					NSAccessibilityRoleDescriptionAttribute,
					NSAccessibilitySubroleAttribute,
					NSAccessibilityParentAttribute,
					NSAccessibilityWindowAttribute,
					NSAccessibilityPositionAttribute,
					NSAccessibilitySizeAttribute,
					NSAccessibilityTitleAttribute,
					NSAccessibilityDescriptionAttribute,
					NSAccessibilityFocusedAttribute,
					NSAccessibilityEnabledAttribute,
					nil];
}

- (NSArray *)accessibilityActionNames
{
	return [NSArray arrayWithObject:NSAccessibilityPressAction];
}

- (NSString *)accessibilityActionDescription:(NSString *)action
{
	if ([action isEqual:NSAccessibilityPressAction])
		return NSLocalizedString(@"select_square", "select");
	else
		return NSAccessibilityActionDescription(action);
}

- (id)accessibilityFocusedUIElement
{
	return self;
}

- (BOOL)accessibilityIsIgnored
{
	return NO;
}

- (NSRect)accessibilityFocusRingBounds
{
	NSRect r = [fView approximateBoundsOfSquare:fSquare];

	r.origin = [[fView window] convertBaseToScreen:
								   [fView convertPoint:r.origin toView:nil]];

	return r;
}

- (id)accessibilityAttributeValue:(NSString *)attribute 
{
	if ([attribute isEqual:NSAccessibilityParentAttribute])
		return fView;
	else if ([attribute isEqual:NSAccessibilityWindowAttribute])
		return [fView window];
	else if ([attribute isEqual:NSAccessibilityRoleAttribute])
		return NSAccessibilityButtonRole;
	else if ([attribute isEqual:NSAccessibilitySubroleAttribute])
		return NSAccessibilityUnknownSubrole;
	else if ([attribute isEqual:NSAccessibilityRoleDescriptionAttribute])
		return @"";
	else if ([attribute isEqual:NSAccessibilityPositionAttribute])
		return [NSValue valueWithPoint:
							[self accessibilityFocusRingBounds].origin];
	else if ([attribute isEqual:NSAccessibilitySizeAttribute])
		return [NSValue valueWithSize:
							[self accessibilityFocusRingBounds].size];
	else if ([attribute isEqual:NSAccessibilityTitleAttribute])
		return [NSString stringWithFormat:@"%c%u", Col(fSquare), Row(fSquare)];
	else if ([attribute isEqual:NSAccessibilityDescriptionAttribute])
		return [fView describeSquare:fSquare];
	else if ([attribute isEqual:NSAccessibilityValueAttribute])
		return nil;
	else if ([attribute isEqual:NSAccessibilityDescriptionAttribute])
		return nil;
	else if ([attribute isEqual:NSAccessibilityFocusedAttribute])
		return [NSNumber numberWithBool:
							 [[NSApp accessibilityFocusedUIElement] 
								 isEqual:self]];
	else if ([attribute isEqual:NSAccessibilityEnabledAttribute])
		return [NSNumber numberWithBool:YES];
#if 0
	else
		NSLog(@"unknown attr: %@\n", attribute);
#endif

	return nil;
}

- (BOOL)accessibilityIsAttributeSettable:(NSString *)attribute 
{
	if ([attribute isEqual:NSAccessibilityFocusedAttribute])
		return YES;

	return NO;
}

- (void)accessibilitySetValue:(id)value forAttribute:(NSString *)attribute 
{
}

- (void)accessibilityPerformAction:(NSString *)action
{
	if ([action isEqual:NSAccessibilityPressAction]) {
		[fView selectSquare:fSquare];
	}
}

@end

@implementation MBCBoardView ( Accessibility )

- (NSArray *)accessibilityAttributeNames {
	return [[super accessibilityAttributeNames] 
			   arrayByAddingObject:NSAccessibilityContentsAttribute];
}

- (NSArray *)accessibilityContentsAttribute {
    return [self accessibilityChildrenAttribute];
}

- (BOOL)accessibilityIsContentsAttributeSettable {
    return NO;
}

- (NSString *)accessibilityRoleAttribute {
    return NSAccessibilityGroupRole;
}

- (NSArray *)accessibilityChildrenAttribute 
{
	NSMutableArray * kids = [[[NSMutableArray alloc] init] autorelease];
	for (MBCSquare square = 0; square<64; ++square)
		[kids addObject: [MBCBoardAccessibilityProxy proxyWithView:self 
													 square:square]];
	return kids;
}

- (id)accessibilityHitTest:(NSPoint)point
{
    NSPoint local 		= 
		[self convertPoint:[[self window] 
							   convertScreenToBase:point] fromView:nil];
	MBCPosition	pos		= [self mouseToPosition:local];
	MBCSquare 	where 	= [self positionToSquare:&pos];

	id hit;
	if (where == kInvalidSquare) 
		hit = self;
	else 
		hit = [MBCBoardAccessibilityProxy proxyWithView:self square:where];

	return hit;
}

#if 0
- (id)accessibilityAttributeValue:(NSString *)attribute 
{
	id v = [super accessibilityAttributeValue:attribute];
	NSLog(@"Value %@ = %@\n", attribute, v);

	return v;
}

- (BOOL)accessibilityIsAttributeSettable:(NSString *)attribute 
{
	BOOL s = [super accessibilityIsAttributeSettable:attribute];
	NSLog(@"IsSettable %@ = %d\n", attribute, s);

	return s;
}

- (void)accessibilitySetValue:(id)value forAttribute:(NSString *)attribute 
{
	NSLog(@"Set %@ = %@\n", attribute, value);
	[super accessibilitySetValue:value forAttribute:attribute];
}
#endif

static NSString * sPieceID[] = {
	@"",
	@"white_king",
	@"white_queen",
	@"white_bishop",
	@"white_knight",
	@"white_rook",
	@"white_pawn",
	@"",
	@"",
	@"black_king",
	@"black_queen",
	@"black_bishop",
	@"black_knight",
	@"black_rook",
	@"black_pawn"
};

static NSString * sPieceName[] = {
	@"",
	@"white king",
	@"white queen",
	@"white bishop",
	@"white knight",
	@"white rook",
	@"white pawn",
	@"",
	@"",
	@"black king",
	@"black queen",
	@"black bishop",
	@"black knight",
	@"black rook",
	@"black pawn"
};

- (NSString *) describeSquare:(MBCSquare)square
{
	MBCPiece p = What([fBoard curContents:square]);

	return [NSString stringWithFormat:@"%c%u: %@", Col(square), Row(square),
					 NSLocalizedString(sPieceID[p], sPieceName[p])];
}

- (void) selectSquare:(MBCSquare)square
{
	if (fPickedSquare != kInvalidSquare) {
		[fInteractive startSelection:fPickedSquare];
		[fInteractive endSelection:square animate:YES];
	} else {
		[fInteractive startSelection:square];
		[self clickPiece];
	}
}

@end

// Local Variables:
// mode:ObjC
// End: