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/*
* AQGridViewUpdateItem.m
* AQGridView
*
* Created by Jim Dovey on 1/3/2010.
* Copyright (c) 2010 Kobo Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* Neither the name of the project's author nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
* HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
* TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
* LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
*/

#import "AQGridViewUpdateItem.h"

@implementation AQGridViewUpdateItem

@synthesize originalIndex=_index, newIndex=_newIndex, action=_action, animation=_animation, offset=_offset;

- (id) initWithIndex: (NSUInteger) index action: (AQGridViewUpdateAction) action animation: (AQGridViewItemAnimation) animation
{
self = [super init];
if ( self == nil )
return ( nil );

_index = index;
_action = action;
_animation = animation;

return ( self );
}

- (void) setNewIndex: (NSUInteger) value
{
NSAssert(self.action == AQGridViewUpdateActionMove, @"newIndex set on a non-move update item");
_newIndex = value;
}

- (NSString *) description
{
NSString * actionDesc = @"<Unknown>";
switch ( _action )
{
case AQGridViewUpdateActionInsert:
actionDesc = @"Insert";
break;
case AQGridViewUpdateActionDelete:
actionDesc = @"Delete";
break;
case AQGridViewUpdateActionMove:
actionDesc = @"Move";
break;
case AQGridViewUpdateActionReload:
actionDesc = @"Reload";
break;
default:
break;
}

NSString * animationDesc = @"<Unknown>";
switch ( (UITableViewRowAnimation)_animation )
{
case UITableViewRowAnimationFade:
animationDesc = @"Fade";
break;
case UITableViewRowAnimationRight:
animationDesc = @"Right";
break;
case UITableViewRowAnimationLeft:
animationDesc = @"Left";
break;
case UITableViewRowAnimationTop:
animationDesc = @"Top";
break;
case UITableViewRowAnimationBottom:
animationDesc = @"Bottom";
break;
case UITableViewRowAnimationNone:
animationDesc = @"None";
break;
case UITableViewRowAnimationMiddle:
animationDesc = @"Middle";
break;
default:
break;
}

return ( [NSString stringWithFormat: @"%@{index=%u, action=%@, animation=%@, offset=%.02f}", [super description], (unsigned)_index, actionDesc, animationDesc, (double)_offset] );
}

- (NSComparisonResult) compare: (AQGridViewUpdateItem *) other
{
if ( _index > other->_index )
return ( NSOrderedDescending );
else if ( _index < other->_index )
return ( NSOrderedAscending );
return ( NSOrderedSame );
}

- (NSComparisonResult) inverseCompare: (AQGridViewUpdateItem *) other
{
return ( [other compare: self] );
}

- (NSUInteger) index
{
// handle case where offset is negative and would cause index to wrap
if ( (_offset < 0) && (abs(_offset) > _index) )
return ( 0 );

return ( _index + _offset );
}

@end
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